DIY Solar Guide: System Planning and Blueprint

How to Size, Set Up & Maintain Your Own Off-Grid Solar Power System

By the ShopSolar team — built from 8+ years of hands-on experience, 50,000+ kits sold, and thousands of real customer conversations. [Download PDF Version]

Introduction

Off-grid solar power systems are hard to understand. The electrical terminology can leave you feeling clueless and have you questioning your intelligence. (Trust me, I was right there not long ago.) Amps, volts, watts, watt-hours, amp hours, split phase, 120/240 inverter, battery, pure sine wave, monocrystalline — the list of electrical jargon goes on.

On top of that, most people who understand this stuff love using big fancy words and seem to want to make you feel even dumber than you already do. That was my experience early on.

I had no prior electrical experience when first getting into the industry half a decade ago. It took me over two years to even begin wrapping my head around the fundamentals — and that was working with and selling solar kits every single day.

After speaking with thousands of customers and selling over 30,000 off-grid solar kits, it made sense to put everything I've learned into a simple guide that helps you do it yourself.

Here's the truth: you can sum up off-grid solar into a handful of math equations and a few basic principles. I promise not to use big fancy words or dive into the scientific backgrounds of each component. Instead, we'll use simple analogies, a handful of equations, and some diagrams to have you sizing the perfect solar system for your needs in less than an hour.

Table of Contents

1. How Off-Grid Solar Works

2. How to Size Your System (7 Steps)

3. Choosing the Right Solar Kit

4. Setting Up & Installing Your System

5. Maintenance & System Care

6. Applications & Insights

7. Appendix A: Load Calculation Worksheet

8. Appendix B: Wiring a Battery Bank

9. Appendix C: Grid-Tie vs. Off-Grid Solar

10. Appendix D: Solar Generator Wiring Diagram

11. Appendix E: Custom Solar Kit Schematic

12. Appendix F: Parts Lists by System Type

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1. How Off-Grid Solar Works

Before we get into sizing equations, let's make sure the concept clicks. Here are two analogies born from thousands of customer phone calls.

The Bathtub Analogy

Think of your battery bank as a bathtub. It holds power the same way a bathtub holds water.

Your solar panels are the faucets — the only way to fill it up (other than a backup fuel generator). Solar panel arrays are sized in watts (W) or kilowatts (kW). Batteries are sized in watt-hours (Wh) or kilowatt-hours (kWh).

The sun only shines effectively for about six hours every day, so your panels have a limited window to collect power. After 5–6pm, the flow stops and you can only use what you collected during the day.

Every evening you need to use that stored power carefully — making sure there's enough left in the morning to run your appliances until the sun comes back up and starts filling your battery again.

In an ideal world, your solar array is large enough that your battery is full or overflowing by 2–3pm every day. That gives you more than enough power to get through the night.

The more you're willing to spend, the bigger the tub you can get — from a bathtub, to a hot tub, to a swimming pool. And the bigger the tub, the bigger the faucets you need to fill it during the day. The same logic applies to solar generator kits and custom solar systems.

The Bank Account Analogy

You can also think of your battery bank like a bank account. Your solar panels earn the deposits — the only way to get power in. (A backup generator works too.)

Again, your panels only have about six good hours a day to generate income. The more panels you have, the more money you make per hour.

After 5–6pm, the deposits stop. You have to live on what you earned during the day, spending it carefully so you have enough left in the morning. Your goal: have a big enough array that your account is full or overflowing by 2–3pm every day.

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2. How to Size Your Solar System

Sizing any solar system comes down to three numbers:

1. Battery Bank Size

2. Solar Array Size

3. Inverter Size

Using the seven steps below, you can calculate all three in about 20–30 minutes. Grab a pen and paper and follow along.

 

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Step 1 — Amps × Volts = Watts

You need this equation to find the watt draw of each appliance you want to run. Most appliances list their amps and/or volts on a sticker. If an appliance only lists amps and plugs into a standard wall outlet, assume 120V.

Dryers, ovens, well pumps, and similar heavy appliances are typically 240V — you can tell by the large, unusual plug shape.

 

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Step 2 — Total Average Hourly Load in Watts (TAHL)

Add up the watt draw of every appliance you want to run off solar. Only count appliances that run for more than five minutes at a time — microwaves, toasters, and hair dryers are too brief to meaningfully factor in. You're looking for your average continuous hourly load.

Why? You're calculating the load overnight when you're running purely off stored battery power. After the sun goes down, there's no incoming power — you need to make sure you won't drain your battery two or three hours after sunset.

Example loads to include: fridge, freezer, lights, WiFi router, fans, TV, phone chargers.

Loads to note separately for inverter sizing: well pump, air conditioner (these matter more for inverter size than battery bank size since they don't run all night).

Important notes:

• Most appliances list their maximum load, not their average draw. A fridge label may say 800W but it may only average 100W — a massive difference. Google "[appliance name] average watt draw" for more accurate numbers.

• Typical range: 100–500W/hour average, even for larger off-grid homes.

• See Appendix A below for a full load calculation worksheet.

 

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Step 3 — Size Your Battery Bank

Formula: TAHL × Target Run Time in Hours = Battery Bank Size in Watt-Hours (Wh)

Use 18–20 hours as your baseline run time. This covers from when the sun sets (~5–6pm) through to when it rises again (~8–9am).

Example:

• TAHL: 450W

• Target run time: 20 hours

• Battery bank: 450 × 20 = 9,000Wh (9kWh)

Adjust the run time multiplier to fit your situation:

• Light users (a light or two at night): 8–10 hours

• Standard household overnight: 18–20 hours

• Want heavy backup buffer: 40–50 hours

Note on running AC overnight: A 15,000 BTU air conditioner draws ~1,000W per hour. Running it for 8 hours = 8kWh just for the AC — factor this in separately if needed.

 

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Step 4 — Understand Watt-Hours vs. Kilowatt-Hours

• Watts (W) = moving power — consumption or generation at a single point in time

• Watt-hours (Wh) = stored power — energy over a period of time

• Kilowatt-hours (kWh) = 1,000 watt-hours

When there's an "h" at the end, it's stored energy. When there's no "h," it's just watts — power in motion.

Battery capacity is measured in watt-hours or kilowatt-hours. Your electricity bill is measured in kWh — same unit.

 

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Step 5 — Size Your Solar Panel Array

Formula: Battery Bank Size in Wh ÷ Target Recharge Time in Hours = Solar Array Size in Watts

Use 6 hours as your baseline recharge target. Most of the US gets no more than 6 good peak sun hours per day. Four hours is even better if budget and space allow.

Example (9,000Wh battery):

• 9,000Wh ÷ 6 hours = 1,500W array

• 9,000Wh ÷ 4 hours = 2,250W array (faster recharge, better for cloudy days)

If your recharge time stretches to 8–10 hours, add more panels. You won't be putting enough power into the batteries during the day.

 

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Step 6 — Calculate Number of Panels Needed

Formula: Array Size in Watts ÷ Panel Wattage = Number of Panels

The most popular panel sizes are 200W (versatile, lighter, easier to handle) and 370W (large-scale residential, ~50lbs each, usually sold in minimum quantities of 8).

Example:

• 1,500W ÷ 200W = 7.5 → round up to 8 panels (1,600W)

• 2,250W ÷ 370W = 6.08 → 6 panels

 

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Step 7 — Size Your Inverter

Your inverter converts stored DC battery power into usable AC power for your appliances. Most inverters also work as chargers — you can drive power into your batteries from a generator or wall outlet through the inverter.

Size your inverter based on your single biggest load — not your average load.

Every appliance surges when it first starts up. A well pump rated at 1,000W run may surge to 4,000W at startup. Most inverters handle 3× their continuous rating for about 30 seconds — always check specs before buying.

Most popular inverter sizes:

Example: Average load of 450W, largest appliances are a 15,000 BTU AC (1,500W run) and a 1HP well pump (4,000W surge). A 6,000W inverter is the safe choice — handles both surges with room to grow.

 

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Summary — Your Three Numbers

The most common mistake: sizing too small. Nobody has ever called us saying they have too much power. If your battery dies two hours after sunset or your inverter keeps tripping a breaker — you went too small.

 

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Bonus: How Long Will a Battery Run an Appliance?

This is probably the single most common question we get.

Formula: Battery Size in Wh ÷ Appliance Watt Draw = Run Time in Hours

Examples:

• 3,600Wh battery ÷ 100W fridge = 36 hours

• 3,600Wh battery ÷ (100W fridge + 50W TV + 50W lights = 200W) = 18 hours

With this one equation, you're already ahead of most people trying to figure out off-grid solar.

 

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3. Choosing the Right Solar Kit

Solar Generator Kits vs. Custom Solar Systems

Custom Solar Kits Custom kits offer more power and expandability. They can grow with your needs and are the right choice for full-time off-grid living, whole-home backup, or offsetting your electricity bill with grid independence. The tradeoff: they're more complex to install and almost always require a licensed electrician for final connections and safety sign-off.

Solar Generator Kits (All-in-One) Solar generators have come a long way since 2018 when we first started ShopSolarKits.com. The key question: how portable and mobile do you need to be?

SoGen kits pack the battery, charge controller, and inverter into a single rugged unit with clearly labeled ports. Zero wire cutting or stripping. Plug the panels in one end, plug your appliances into the other — you're running.

They're ideal for emergency backup, weekend getaways, RVs, food trucks, and mobile commercial applications. They're not as expandable as custom systems, and for the same storage capacity can cost more — but if time and simplicity matter more than cost, they're your best bet.

Popular brands at ShopSolar: EcoFlow, Jackery, Bluetti, Anker, Pecron.

 

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Rigid vs. Folding Solar Panels

The performance difference between rigid and folding panels is minimal — this comes down to use case.

Rigid panels are cheaper, typically last longer, and are designed to be permanently mounted outdoors. They can also be used portably by leaning them against a wall, fence, or bricks.

Folding panels cost more because of the convenience of portability — folding up and sliding into the back of a car. Great for camping, RVs, and emergency kits you want stored away.

 

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Roof Mount vs. Ground Mount

Ground mount is the most popular option at ShopSolar. You can usually find a better location, angle the array perfectly toward the sun all day, and cleaning and maintenance are far easier since you can walk right up to the panels.

Roof mount looks cleaner and more traditional. Maintenance is trickier when you're navigating your roofline.

Realistically, most people don't choose — they use what their property allows. If your roof works perfectly, use it. If it doesn't, ground mount.

 

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4. Setting Up & Installing Your System

Off-Grid Home Solar Systems

Home solar is the most common application — great for backup during blackouts, reducing your electricity bill, or full grid independence.

The biggest advantage of home systems over mobile setups is space. You have room for panels, inverters, and batteries — a garage corner, a backyard ground mount, whatever works.

[ DIAGRAM: Typical off-grid home solar system wiring layout — panels → charge controller → battery bank → inverter → AC loads]

Installation tips:

Panel mounting:

• Roof works great if you have good sun exposure and minimal shading. Ground mounting is ideal when roof space is limited or shaded, and makes cleaning much easier.

Other components:

• Since the inverter, charge controller, and batteries don't need sunlight, you can place them anywhere — mounting to a wall is common practice.

• If wall mounting isn't feasible, mount everything to a plywood sheet — cleaner install, no tangled or damaged wiring.

• Keep all components close to each other. Longer DC cables mean more power loss.

Optimization:

• Use a solar thermal unit for water or space heating rather than running electric heaters off your solar system — much more efficient.

• Keep a diesel or gas generator for occasional large loads or rare multi-day outages. It doesn't make financial sense to build a battery bank sized for an event that happens once every few years.

 

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Portable & Mobile Solar Systems (RV, Van, Boat)

Van life, RV travel, liveaboard boats — portable solar power solves the core challenge of access to energy in a vehicle. A van's battery runs on gasoline or diesel — expensive and limited. Solar gives you clean, free power wherever you park.

[ DIAGRAM: Typical RV/mobile solar system — roof panels → MPPT controller → lithium battery bank → fuse block → DC loads + inverter for AC loads]

Installation tips:

Maximize panels:

• Install as many panels as your roof can physically fit. Space is your limiting factor on an RV or boat, not math. Overdesign — sunlight is less predictable based on where you're parked or facing, and panels generate less on a vehicle than on a fixed home mount.

Panel installation:

• Mount using Z-style brackets or adjustable tilt mechanisms drilled into the roof. Seal all holes with weatherproof sealant once installed to prevent water intrusion.

• Flexible panels are an alternative — no drilling required, more aerodynamic, slightly more expensive.

Wiring:

• Use weatherproof roof cable entry glands to route wires inside.

• 10 AWG cables are the most common for RV applications.

• Pro tip: use higher voltage, lower current configurations where possible — cables don't need to be as thick and you'll reduce losses and save money.

Battery selection:

• Lithium batteries are far better than lead-acid for mobile use. Lighter weight, higher depth of discharge (more usable storage per bank size), and much longer lifespan. Worth the extra cost.

Wiring your loads:

• Use a fuse block for DC appliances — it has multiple fuses of different ampere ratings, making it easy to connect loads of different sizes cleanly.

• For AC loads, install a small distribution panel with standard wall outlets near your desk or sleeping area.

Optimization:

• A roof vent fan that pushes hot air out (with a floor vent pulling cool air in) makes a massive difference compared to running AC.

• Painting your vehicle white noticeably reduces heat absorption.

• Electric seat heaters and heated blankets are far more efficient than space heaters.

 

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Emergency Backup Power Systems

Power outages are not new to Americans — from Oklahoma's ice storm in 2020 to the Texas winter storm in 2021, the cost and frequency of grid failures is rising. Brownouts, scheduled rotating outages, and natural disasters make a backup plan essential.

Traditional generators have real problems: you depend on a fuel supply that may not be accessible during the emergency itself, they're noisy, they pollute, and you can't safely run them indoors.

Solar backup systems solve all of these. They use the same core components as regular off-grid systems — the key difference is that they're sized and configured to power your essential loads during a grid event, not necessarily to run 24/7.

Many people keep the equipment stored in a basement or garage and set it up portably when a blackout hits. Foldable panels are popular for this reason.

[ DIAGRAM: Emergency backup system — foldable panels → solar generator → transfer switch → essential home circuits (fridge, lights, fan)]

Key addition: the transfer switch

A transfer switch is what makes emergency backup practical. It connects your solar system to specific circuits in your breaker panel — you choose which ones (refrigerator, living room lights, a fan, phone chargers, etc.).

When the grid goes down, you flip the switch and those selected circuits run from solar instead. When the grid comes back, you flip it back.

Two options:

• With a transfer switch: cleaner, easier, uses your existing home circuits. Works best with a solar generator as the power source — a single portable connection point.

• Without a transfer switch: you run individual extension cords from your solar generator to each appliance you want to power. It works, just less convenient.

Installation note: transfer switches are more complex than basic solar installs — most manufacturers recommend a licensed electrician for this part.

 

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Solar Generators — The Simplest Off-Grid Option

If the idea of wiring a full system sounds like too much, a solar generator is your answer.

Someone had the brilliant idea of putting the battery, charge controller, and inverter into a single rugged box with clearly labeled input/output ports. No wire cutting, stripping, or bolting. Just connect your panels to the input and plug your appliances into the output.

Modern solar generators also include features like Bluetooth connectivity, wireless charging pads, and mobile app monitoring.

Key advantages:

• Truly portable — handles, wheels, can be moved anywhere

• Lithium-ion or LiFePO4 batteries — maintenance-free, long-lasting

• Perfect partner for a transfer switch in emergency backup setups

• Zero installation expertise required

Limitations:

• More expensive per watt-hour than a custom build

• Fixed size — not as expandable for large home systems

• Designed for portability, not maximum capacity

If time and simplicity matter more than cost, this is your best starting point. You can always add more panels or a second unit later.

 

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5. Maintenance & System Care

One of the biggest advantages of solar power systems is how little maintenance they require. No moving parts means virtually no wear and tear. Here's all you need to do:

 

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Cleaning Solar Panels

Clean panels produce more power. Aim to rinse them every few weeks — more often in dusty areas or on RVs where the angle is flatter and debris accumulates faster.

• A simple garden hose rinse followed by a wipe-down is all you need

• Avoid high-pressure water directly on junction boxes or cable connections

• Ground-mounted panels are much easier to clean than roof-mounted

 

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Battery Maintenance

Modern lithium batteries require very little ongoing maintenance compared to older lead-acid batteries. Best practices:

• Check battery voltage regularly — your charge controller displays it. A fully charged 48V bank should read 48–52V.

• For emergency solar generators in storage: cycle them every 6 months. Run a TV or fridge off it for 6–8 hours, recharge from a wall outlet, then put it back in storage. This maintains battery health and verifies the system is working.

• For mobile systems: keep the battery bank neatly secured. Battery terminals are exposed and a dropped wrench can cause a short circuit. If batteries are tall with a small footprint, use a rope or strap to secure them.

 

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Annual Full-System Check

Once or twice a year, do a complete connection check:

• Shut down the system

• Disconnect all wiring

• Clean connections with a brush

• Reconnect

• Check for leaking chemicals, rodent damage to wiring, or corrosion

That's it. Takes an hour. Extends system life significantly.

 

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6. Applications & Insights

Off-grid solar works for far more than just homes and RVs. Here are some applications people often don't think of:

 

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Electric Vehicle Charging

The common argument against EVs — that they indirectly use fossil fuels — disappears when you charge from solar. Truly zero-emission driving.

Your home has more than enough space for the solar panels needed to fully recharge an EV daily. Some people build solar sheds with an integrated charger — shelter for the car and free power in one.

Formula: Power required in kW = Energy required per day in kWh ÷ peak sunshine hours

Example: An average EV holds ~40kWh. In a location with 5 peak sun hours per day: 40kWh ÷ 5 hours = 8kW solar array needed

For a system powering only your EV, a smart DC EV charger can eliminate the need for an inverter entirely, and can prioritize solar charging over grid power automatically.

 

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Well Pumps & Sump Pumps

Water is the second most critical need in an off-grid setting. For those not connected to municipal water, a solar-powered pump is essential.

Two approaches:

1. Connect your AC pump to your solar system like any other appliance. The catch: AC pumps have a large startup surge and only run for short periods. You'll need to oversize your panels or avoid running other large loads simultaneously when the pump is active.

2. Install a dedicated DC solar pump system. A DC motor-driven pump is more efficient, quieter, requires no inverter, and can operate on shorter cable runs. Cost for a custom system is often around $2,000. Modular, easy to maintain, and expandable.

Solar pumps work equally well for sump pumps — the principles are identical.

 

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Small Mobile Businesses

Farmer's market stalls, food trucks, ice cream shops, physician clinics, pop-up retail — any small business with predictable power needs can run entirely on solar. The sizing process is identical: calculate your daily energy consumption, check sunshine hours for your location, size your battery and panel array accordingly.

 

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Crypto Mining

Crypto mining has enormous energy requirements — mining one Bitcoin takes over 1,500kWh, with an average consumption of ~50kWh/day. Utility companies often charge heavy premiums when you exceed usage tiers, making grid power expensive for miners.

Solar offsets this dramatically. A 12kW+ array with appropriate battery storage can handle significant mining loads. The environmental benefit is an added bonus — solar addresses one of the most criticized aspects of crypto mining.

 

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Air Conditioners

Most North American homes have central AC — a major power draw on any solar system. If you don't use AC year-round, consider leaving it on grid power and sizing your solar for everything else. If you're fully off-grid, you must include it.

Tips for reducing AC load on solar:

• Mini-split units are far more efficient than central systems — they cool one room at 500–800W vs. a whole-house system at 3,000W+

• Fans use just 50–100W vs. hundreds to thousands of watts for AC — passive cooling goes a long way

• Passive cooling strategies (shade, white paint, thermal mass) reduce how hard your AC has to work

 

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Pool or Pond Heating

A warm backyard pool is one of life's pleasures — but electric resistance heaters are enormous power draws and a poor match for solar systems.

Better option: solar thermal pool heaters. Rather than converting sunlight to electricity and then back to heat (losing energy in both conversions), solar thermal systems use the sun's heat directly. An array of solar water heaters on a roof or ground beside the pool circulates water through panels to heat it. You can combine solar thermal with a conventional heater for backup on cloudy days.

Smaller portable solar thermal water heaters are also available — far cheaper and more portable than roof installations, suitable for smaller pools or warmer climates.

 

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Appendix A: Load Calculation Worksheet

What Are Your Goals?

A common mistake is treating solar like a standardized product, like buying a TV. There is no one-size-fits-all. The right system depends on several factors. Work through the questions below to get clarity before you size anything.

Insight on question 4: To find your location's peak sunshine hours, Google "peak sunshine hours in [your city]."

Insight on question 5: A generator doesn't need to replace solar — it can supplement it for rare events like multi-day outages or unusually high loads. If you have one, you can size your battery bank more conservatively.

 

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Common Appliance Wattage Reference

Important note on fridges: Fridges cycle on and off — they don't run continuously at rated wattage. The label may say 500–750W but actual average draw is often 80–120W. If your load calculation seems high, reduce your fridge estimate significantly.

Two ways to find appliance wattage if not listed:

1. Look for the sticker on the back or bottom of the appliance — find the value followed by W or kW

2. Google "[appliance name and model] average wattage" or "power consumption"

 

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Load Calculation Example

To convert to kWh: divide total Wh by 1,000.

Your turn: List every appliance you want to power, multiply wattage × quantity × hours per day, add them up. This is the foundation of your entire system sizing.

 

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Appendix B: Wiring a Battery Bank

Battery Bank Connections

Wiring a solar system is simpler than it looks. Think of it like following a map — you don't need to understand the whole thing at once. Just focus on connecting one item to the next, one step at a time.

Two universal rules:

1. Polarity: Always connect positive to positive (+) and negative to negative (−), unless intentionally wiring in series. Use colored cables — red for positive, black for negative.

2. Cable size: Use the correct gauge wire for the current flowing through it. Undersized cables are a fire hazard.

To find current when you know power and voltage: A (current) = W (power) ÷ V (voltage) Example: 1,000W at 24V = 1,000 ÷ 24 = 41.7A

Pro tip: Use higher voltage, lower current configurations where possible. Higher voltage doesn't require thicker cables, and you'll reduce losses and save money on wiring.

[ DIAGRAM: Basic off-grid solar system wiring — solar panels → MPPT charge controller → battery bank → inverter → AC loads. Include DC load controller branch. Label all connections clearly.]

 

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Wiring the Batteries

Your battery bank voltage must match your inverter's DC input voltage. If your inverter needs 48V DC input, your battery bank must output 48V.

You have three main options:

Option 1 — Solar Generator (Simplest) Everything is pre-wired in a single unit. Connect panels to the input port, appliances to the output. No battery wiring required. Best for most beginners and portable applications.

Option 2 — Single Battery at Required Voltage Modern battery banks are available at 24V, 48V, or other common voltages — you don't have to wire multiple 12V units together. Just connect the charge controller to one end and the inverter to the other.

Option 3 — Multiple 12V Batteries Wired Together If you have multiple 12V batteries and need higher voltage, you'll need to understand series and parallel wiring.

Series connection — adds voltage, keeps capacity the same: Connect the positive terminal of one battery to the negative of the next. Four 12V batteries in series = 48V at the same kWh capacity.

[DIAGRAM: Series battery wiring — 4 x 12V batteries connected positive-to-negative, outputting 48V total]

Parallel connection — adds capacity (kWh), keeps voltage the same: Connect all positive terminals together and all negative terminals together. Two 12V/100Ah batteries in parallel = 12V at 200Ah.

[DIAGRAM: Parallel battery wiring — 2 x 12V batteries with positive terminals connected together and negative terminals connected together, outputting 12V with doubled capacity]

Combination (series + parallel): Most real-world systems need both higher voltage AND higher capacity. Example: 8 batteries, each 12V/1kWh, target 8kWh at 48V.

• Series alone: 8 batteries × 12V = 96V (too high) at 8kWh

• Parallel alone: 8 batteries at 12V, 8kWh (voltage too low)

• Solution: Wire 4 batteries in series → one "string" at 48V/4kWh. Make two strings. Wire the two strings in parallel → 48V at 8kWh.

[DIAGRAM: Series-parallel combination — 2 strings of 4 x 12V batteries, each string in series for 48V, both strings in parallel for doubled capacity]

When physically connecting batteries, strip cable ends, attach crimp connectors, and bolt to the terminal. Always place batteries in a dry location — conductive fluids on terminals cause serious short circuits, equipment damage, and fire.

 

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Appendix C: Grid-Tie vs. Off-Grid Solar

What's the Difference?

When you drive down a residential street and see panels on rooftops, 99% of those are grid-tied systems. The homeowner is generating power and selling any excess back to their utility company. These systems connect directly to the grid — meaning if the grid goes down, their power goes down too. No independence.

[DIAGRAM: Side-by-side comparison — grid-tie system (panels → inverter → grid) vs. off-grid system (panels → charge controller → battery → inverter → loads)]

Off-grid solar means all the power you generate goes into your own battery bank. You're not selling back to the grid — you own every watt you produce. When the grid goes down, you keep the lights on.

A hybrid system gives you both: connected to the grid for convenience, but with battery backup so you're protected when the grid fails. Most of the systems we sell at ShopSolar fall into this category — you can pull from the grid on cloudy days or during high demand, but you have true energy independence when it matters.

Why Do You Need a Battery?

The most common question from first-time buyers: "Why do I even need a battery?"

Simple answer: how are you going to power your appliances every night when the sun goes down?

After 5–6pm, your panels stop producing meaningful power. From that point until 8–9am the next morning, everything runs from stored battery power. Without a battery, you have power during the day only. With a battery, you have power around the clock.

What Does an Off-Grid Solar System Look Like?

Three main parts:

1. Solar panels (array) — capture sunlight and convert it to DC electricity

2. Battery bank (storage) — stores power for use when the sun isn't shining

3. Inverter — converts DC battery power to AC power your appliances can use

Supporting components include a charge controller (regulates charging to protect the battery), cables, fuses, bus bars, and MC4 connectors — but these don't affect sizing decisions.

[DIAGRAM: Basic off-grid system overview — panels → charge controller → battery bank → inverter → home loads. Simple, clear, labeled.]

 

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Appendix D: Solar Generator Wiring Diagram

This diagram shows how to connect solar panels to a solar generator/power station.

[DIAGRAM: 2 solar panels connected in series to a solar generator. Label: MC4 female connectors, MC4 male connectors, positive wire (red), negative wire (black), panel output to generator PV input port.]

Compatible panels for this configuration:

• 100W 12V Rigid panels

• 100W Briefcase (folding) panels

• 200W 12V Rigid panels

• 200W Briefcase (folding) panels

Important notes:

• Both panel output wires often come in black from the factory — connect based on polarity markings, not wire color

• Extend PV output using PV cable extensions — use one extension per two briefcase-style panels

• Always connect female MC4 connectors to male connectors and vice versa

• Ensure all connectors are fully seated and locked — loose connections cause poor production or can heat up and cause fire

• Panels not listed above should be verified for compatibility with your specific generator's input specifications (check the manual)

 

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Appendix E: Custom Solar Kit Schematic Diagram

[DIAGRAM: Full custom off-grid system schematic — solar panel array → combiner box → MPPT charge controller → battery bank (showing series/parallel connections) → inverter/charger → AC distribution panel → loads. Include DC branch with fuse block. Label all components, wire gauges, and connection points clearly.]

 

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Appendix F: Parts Lists by System Type

Home or Small Business System

• Monocrystalline solar panels

• MPPT charge controller

• Pure sine wave inverter

• Lithium batteries (LiFePO4 recommended)

• Mounting racks (roof or ground)

• Cables and wire (appropriately sized)

• Fuses and circuit breakers

• MC4 connectors

• Busbar or combiner box

• Lugs and terminals

Portable or Mobile System (RV, Van, Boat)

• Monocrystalline solar panels (rigid or folding)

• MPPT charge controller

• Pure sine wave inverter

• Lithium batteries

• Mounting brackets (Z-style or adjustable tilt)

• Fuses and circuit breakers

• Weatherproof roof cable entry glands

• Fuse block for DC loads

Emergency Backup System

• Monocrystalline solar panels (folding panels ideal for storage)

• All-in-one solar generator

• Transfer switch

• Mounting racks (or portable stands)

• Cables and PV extensions

 

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About ShopSolar

We're a team on a mission to make solar simple, affordable, and accessible to everyone.

Founded in 2018, we've helped 50,000+ customers across the U.S. and Canada achieve energy independence. We've built a reputation for honest advice, extremely competitive pricing, and lifetime customer support that doesn't disappear after the sale.

We believe the future of energy is smaller, more flexible, and more independent — and we're here to help you get there, whether you're powering a weekend cabin or going fully off-grid.

Have questions about sizing your system? Our team of solar and battery experts is available by phone, email, or live chat. No pressure, no pushy sales tactics — just real advice from people who've helped tens of thousands of customers do exactly what you're trying to do.

📞 877-242-2792 | Mon–Thu 10am–5:30pm EST, Fri 10am–1pm EST 🌐 shopsolarkits.com 📧 info@shopsolarkits.com