CORE vs. PRIME vs. SELECT vs. ELITE: Which ShopSolar Kit Is Right for You?
TL;DR: The four ShopSolar kit lines aren't just different sizes of the same thing — they're built for genuinely different situations. CORE is pure off-grid, no grid connection required or possible. PRIME is grid-optional energy independence for homeowners who want to minimize utility dependence. SELECT optimizes for grid-tied bill reduction plus serious backup. ELITE is the premium Sol-Ark platform for buyers who want the absolute best. Get the architecture wrong and you're paying for capability you can't use — or buying a system that can't do what you need.
We hear some version of this question every week. Someone lands on the ShopSolar site, sees four different kit lines, and calls us: "What's the actual difference? Which one do I need?"
It's a fair question. The names don't tell you much on their own. So here's the honest breakdown — starting with the one question that actually determines which line is right for you.
What Are You Actually Trying to Do?
Before specs, before price, before anything else — this question decides the kit line. Because CORE, PRIME, SELECT, and ELITE aren't just different sizes. They're built around fundamentally different use cases, and the underlying inverter architecture of each line reflects that.
Is your location somewhere a grid connection is impossible or impractical — a remote cabin, a hunting camp, an outbuilding at the end of a long dirt road? That's CORE. It's designed exclusively for that situation.
Do you want a versatile system that can handle high-performance home backup, peak-shave your utility bill, and also power an off-grid cabin or home depending on what you need? That's PRIME — their most flexible line.
Are you a homeowner who wants to fully integrate with the utility grid, sell power back through net metering, and maintain serious battery backup? Or do you need industrial-grade capacity for a large estate, commercial operation, or high-capacity off-grid homestead? That's SELECT — the line that spans grid-tied optimization at the PLUS and MAX tiers all the way up to large-scale independent power at the PRO tier.
Do you want the gold standard of hybrid solar — total energy independence, high-capacity backup, or a professional-grade hybrid setup built on Sol-Ark inverters that maximizes both off-grid capability and grid savings? That's ELITE.
Getting the line wrong costs real money. CORE can't connect to the grid. SELECT PLUS and MAX are built for grid integration and aren't the right fit for a no-grid situation. Know your primary use case before you size anything.
CORE Power Kits: Pure Off-Grid
CORE is ShopSolar's off-grid-only line. No grid connection. No net metering. No utility relationship of any kind. Solar goes into your battery, battery powers your loads. That's it — and for the right application, that's exactly what you want.
If you're running a remote cabin, a workshop on rural property, a hunting or fishing camp, or any structure where grid power would cost a fortune to run or simply isn't an option, CORE is built for you. It's DIY-friendly, ships complete with everything you need, and runs entirely independent of the utility infrastructure.
The three CORE tiers:
CORE PLUS — 800W solar, 3kW inverter, 5-7kWh lithium battery. Entry-level off-grid power for lights, a small fridge, phone charging, fans, and basic electronics. Weekend cabins, hunting camps, small outbuildings, agricultural essentials like electric fences and gate openers.
CORE MAX — 1.6kW solar, dual 3kW inverters with 120/240V split-phase output, 5-7kWh battery. Handles 240V loads like well pumps and larger appliances. Better for more regular use or properties with heavier electrical needs.
CORE PRO — 3.2kW solar, 6kW inverter, 10kWh battery. Serious daily-use off-grid power. Tiny homes, full-time cabin living, homesteads, remote properties where this is the primary electrical system.
One thing CORE won't do: connect to the grid. If your property has grid access and you want to use it as backup or export solar power back to your utility, you need PRIME or SELECT.
Browse all CORE Power Kits or use the Solar Kit Finder to confirm sizing.
PRIME Power Kits: Grid-Optional Energy Independence
PRIME is for the energy independence crowd who still have grid access but want to minimize — or eliminate — their dependence on it.
A PRIME system can run completely off-grid like CORE, but it can also interact with the grid when you choose. Use the grid as a backstop during extended cloudy stretches, charge batteries from the grid during off-peak hours, or keep the utility connection as an emergency backup while running on solar and batteries the vast majority of the time. You're in control of that relationship.
The EG4 inverters powering the PRIME line are built for this. Bigger, more capable, designed to handle whole-home loads — not just outbuildings or cabins.
The three PRIME tiers:
PRIME PLUS — 4.4kW solar, EG4 6000XP inverter, 10-16kWh battery. Entry point for serious whole-home energy independence. Handles most of a home's daily load under good sun conditions. Ideal for off-grid cabins, tiny homes, workshops, and properties wanting standby power without fuel or noise.
PRIME MAX — 7.92kW solar, EG4 12000XP inverter, 15-16kWh battery. The middle-ground for larger homes, higher consumption, large off-grid cabins, and mobile businesses that need dependable daily power with meaningful storage.
PRIME PRO — 10.6kW solar, EG4 18kPV inverter, 28-32kWh battery. The pinnacle of the PRIME line. Built for buyers who demand the best in high-capacity backup and grid-interactive performance — large family homes, properties that want seamless whole-home protection, and serious off-grid builds that need substantial storage and solar headroom.
What PRIME does that CORE doesn't: handles full 120/240V whole-home loads, designed for permanent home installation, optional grid interaction, significantly more panel and battery capacity.
Browse all PRIME Power Kits or get a free proposal to size your system.
SELECT Power Kits: Grid-Integration with Serious Storage
SELECT is built for homeowners who want to fully integrate with the utility grid while maintaining robust battery backup — and at the Pro tier, scales up to handle large luxury estates, commercial operations, and expansive off-grid homesteads.
PLUS and MAX are explicitly designed for grid-tied homeowners — the kind of buyer who wants to export excess solar to the grid, use their battery to avoid peak-hour rates, and have meaningful backup when the grid fails. If you're in a state where selling power back to the grid still makes strong financial sense, SELECT Plus or Max is built for that situation.
SELECT PRO scales into different territory entirely — it's the system for large luxury homes, commercial operations, and expansive off-grid homesteads that need industrial-grade capacity and intelligent multi-input management.
The EG4 FlexBoss inverters across the SELECT line are designed for this kind of grid flexibility. And at the Pro tier, the addition of the GridBoss creates a smart energy hub that manages solar, grid, and generator inputs simultaneously.
The three SELECT tiers:
SELECT PLUS — 7.92kW solar, EG4 FlexBoss18 inverter, 20-32kWh battery. Designed for grid-tied homeowners who want to export solar to the grid, reduce or eliminate their utility bill, and maintain serious backup power. Ideal for states with strong net metering ROI.
SELECT MAX — 10.6kW solar, EG4 FlexBoss21, 20.48-32kWh battery. Steps up for higher consumption homes, heavy loads like 5-ton AC units and well pumps, and more aggressive grid-offset. Same grid-tied flexibility as Plus at significantly more capacity.
SELECT PRO — 15.84kW solar, EG4 FlexBoss21 + GridBoss, 28-32kWh battery. The biggest system in the SELECT line. Serves large luxury estates, commercial operations, and large-scale off-grid homesteads that need the FlexBoss + GridBoss combo for intelligent management of solar, grid, and generator inputs. Scalable as needs grow.
Real customers using SELECT: grid-tied homeowners in strong net metering states, upper-tier residential buyers focused on bill elimination, large property owners needing industrial-grade capacity, commercial operations.
Browse all SELECT Power Kits or use the DIY Solar Calculators to estimate your production and grid offset.
ELITE Power Kits: The Gold Standard of Hybrid Solar
ELITE is ShopSolar's most capable all-around line — built around Sol-Ark all-in-one inverters, and designed for buyers who want total energy independence, high-capacity backup, or a professional-grade hybrid setup that maximizes both off-grid capability and grid savings.
The Sol-Ark inverter is what separates ELITE from everything else in the lineup. It's faster, more versatile, and built to handle 24/7 off-grid use in demanding environments. If you've researched solar inverters and know what Sol-Ark is, you probably already know you want one.
ELITE handles the full range of demanding use cases: whole-home backup including well pumps, electric dryers, and kitchen ranges; premium off-grid estates; luxury amenities like pool pumps, hot tubs, and home automation; small businesses and medical clinics that need zero-downtime protection; and large agricultural properties managing energy across multiple buildings.
The three ELITE tiers:
ELITE PLUS — 7.92kW solar, Sol-Ark 15K inverter, 20-32kWh battery. Entry into the Sol-Ark platform. Features a 200A passthrough for whole-home or critical loads backup depending on your main panel size. For pure off-grid use, the inverter outputs up to 12,000W.
ELITE MAX — 15.8kW solar, Sol-Ark 15K inverter, 28-32kWh battery. Built for those who refuse to compromise on energy security or output. More solar harvest and storage than Plus — handles large off-grid estates, small businesses, and luxury homes with high-demand loads like pool pumps and multiple HVAC units.
ELITE PRO — 21.1kW solar, Sol-Ark 18K inverter, 28-40kWh battery. The largest ELITE configuration. Built for massive whole-home loads, large estates managing multiple buildings, and commercial or agricultural operations that need the most robust storage and output available in a complete kit.
Real customers using ELITE: luxury homeowners who want no-compromise energy independence, off-grid estates, small businesses and medical clinics requiring zero-downtime power, agricultural operations, buyers who specifically want Sol-Ark reliability.
Browse all ELITE Power Kits or request a free proposal for a custom system recommendation.
Plus, Max, Pro: What the Trim Levels Mean
Every kit line uses the same internal structure — three trim levels that scale up capacity and storage within that line. ShopSolar describes it this way:
PLUS is the entry-level configuration. Handles essentials with a focus on efficiency and value.
MAX is the balanced choice. More panel capacity, more storage, more overhead for daily use without pushing the limits of the system.
PRO is the maximum version of that line. Largest array, largest battery bank, highest output — for buyers who need the most available in that category.
Most buyers end up happiest with Max. It gives enough headroom that you're not watching the battery level constantly, and enough storage to handle most nights and cloudy days without stress. Plus is the right call when budget is the primary constraint. Pro is for buyers who've sized up their usage and genuinely need the extra capacity.
Quick Decision Guide
Still not sure? Run through these:
No grid connection, remote location, cabin, camp, outbuilding, homestead: CORE — it's built exactly for this.
Have grid access, want to minimize or eliminate utility dependence, energy independence is the goal: PRIME — grid-optional architecture, whole-home capable.
Grid-tied home, strong net metering state, want to reduce or eliminate your bill while having serious backup: SELECT PLUS or SELECT MAX — built exactly for grid integration with robust storage.
Large estate, commercial operation, or large-scale off-grid homestead needing industrial-grade capacity: SELECT PRO with FlexBoss + GridBoss.
Want the premium Sol-Ark platform, whole-home autonomy including heavy loads, off-grid estate, small business, or zero-downtime reliability: ELITE — the gold standard of hybrid solar.
Still not sure: Use the Solar Kit Finder — it asks a few questions about your situation and points you to the right kit. Or get a free proposal and let our team do the sizing for you. Takes about two minutes, no obligation.
Frequently Asked Questions
What's the main difference between CORE and PRIME? Architecture. CORE is pure off-grid — no grid connection, no net metering, solar and battery only. It's designed for remote locations where grid power isn't available or practical. PRIME is grid-optional — it can run completely off-grid like CORE, but it can also interact with the grid when you want to. PRIME uses larger EG4 inverters capable of whole-home 120/240V loads, where CORE is better suited to outbuildings, cabins, and smaller off-grid applications.
Can I connect a CORE kit to the grid if I change my mind later? No. The CORE line is designed exclusively for off-grid use and is not compatible with grid interconnection. If there's any chance you'll want grid interaction in the future, PRIME is the right starting point. It costs more upfront but gives you flexibility CORE doesn't have.
What's the difference between PRIME and SELECT? Both use EG4 inverters and can interact with the grid, but they're designed around different priorities. PRIME balances off-grid capability with grid interaction — it's for homeowners who want energy independence first, with the grid as an optional backstop. SELECT Plus and Max are built for homeowners who want maximum grid integration — exporting solar to the utility, eliminating their bill through net metering, and maintaining serious backup capacity. SELECT Pro scales further into large estates, commercial operations, and large-scale off-grid homesteads. If you're primarily trying to cut your utility bill in a strong net metering state, SELECT. If energy independence is the goal, PRIME.
Why choose ELITE over SELECT? Two reasons: the Sol-Ark inverter and the use case range. Sol-Ark is built for 24/7 off-grid use in demanding environments — faster, more versatile, and more robustly supported than the EG4 FlexBoss. ELITE is also the right line if your needs go beyond grid integration into true energy independence, luxury off-grid living, whole-home autonomy with heavy loads like well pumps and multiple HVAC units, or small business and zero-downtime applications. SELECT is excellent for grid-tied homeowners. ELITE is for buyers who want no compromises — on or off the grid.
What does Plus, Max, and Pro mean across all kit lines? Plus is entry-level — handles essentials at the best value. Max is the balanced choice with more storage and panel capacity for daily use without strain. Pro is the maximum version of that line — largest array, largest battery, highest output. Most buyers are happiest with Max. It gives enough overhead to handle real-world usage without the cost jump of Pro. Use the Solar Kit Finder to figure out which trim fits your actual energy needs.
Specs and configurations current as of July 2026 — see individual product pages for the most up-to-date details. ShopSolar offers financing through Affirm — rates as low as 0% APR.
This article is for informational purposes only. System performance varies based on location, usage, installation quality, and local conditions. Contact ShopSolar for a personalized recommendation.