Meet the BigBattery NEXUS + APEX 6.5K Battery Storage Bundle—a clean, scalable ESS built for off-grid power and serious backup performance. Pair the APEX-6.5K split-phase hybrid inverter with 1–3× NEXUS 15kWh LiFePO₄ batteries to build 15kWh, 30kWh, or 45kWh of storage, all on a 48V platform.
This bundle is designed to keep things simple: true 120/240V pure sine wave power, big solar input (10,000W total), and the flexibility to charge from solar plus grid/generator when conditions change. On the storage side, NEXUS adds a rugged floor-standing design with built-in protections, self-heating for cold-weather charging, and integrated aerosol fire suppression—so you can build with confidence and scale as your power needs grow.
Key Features & Benefits
-
Choose your storage: 1×, 2×, or 3× NEXUS (15kWh–45kWh) - Build the capacity you need now and expand later without replacing your core system.
-
True split-phase 120/240V pure sine wave (50/60Hz) - Run essential circuits and larger appliances that require real 120/240V power.
-
6,500W rated output (13,000VA max) - Strong output with surge capability for demanding loads.
-
10,000W PV input with dual MPPT (5,000W + 5,000W) - Capture more solar and support larger arrays for greater day-to-day autonomy.
-
Solar + grid/generator charging support (2 AC inputs: Grid & Generator) - Stay powered when sunlight drops—charge and run loads through changing conditions.
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Fast charging capability - Up to 140A solar charge and 80A grid/generator charge for quicker recharge cycles.
-
LiFePO4 + integrated BMS protections (NEXUS) - A safer, stable battery chemistry with built-in protection controls.
-
Cold-weather ready (NEXUS self-heating) - Improves charging reliability in colder environments.
-
Integrated aerosol fire suppression (NEXUS) - Adds an extra layer of safety inside the battery unit.
-
Wide battery operating temps - Charge 32°F–113°F, discharge -4°F–113°F for dependable seasonal performance.
-
12-Year Warranty - Long-term coverage to protect your investment.
Specs in a Glance:
Inverter (BigBattery APEX-6.5K)
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Output: 6,500W rated, 13,000VA max
-
Output Voltage: 120/240 Vac split-phase
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Battery Voltage: 48V nominal system, 40–60Vdc range
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Solar Input: Dual MPPT (1+1), 5,000W + 5,000W, 18A + 18A, 125–450Vdc MPPT range, 550Vdc + 550Vdc Voc max
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Max charging: 140A solar, 80A grid/generator, 140A hybrid
-
AC Inputs: 2 inputs (Grid & Generator)
-
Dimensions / Weight: 25.51 × 16.14 × 5.51 in, 48 lbs
-
Certifications: UL1741, RoHS, FCC Part 15 Class B, IEC62109-1/-2, EN61000 (per spec sheet)
-
Warranty: 5 years
Battery (BigBattery NEXUS 15kWh LiFePO4) — per battery
-
Usable Energy: 15kWh
-
Voltage: 48V system, 51.2V nominal
-
Capacity: 300Ah
-
Max Continuous Discharge: 140A (Max continuous power 7.6kW)
-
Peak Discharge: 270A (1s)
-
Communications: RS485 / RJ45 / CAN
-
Protection Rating: IP54
-
Installation: Indoor floor-standing
-
Dimensions / Weight: 19.7 × 27.5 × 15.7 in, ~315 lbs
-
Battery warranty: (Confirm) (not provided in the supplied specs)
What’s Included:
-
1× BigBattery APEX 6.5K off-grid hybrid inverter
-
Choose: 1× / 2× / 3× BigBattery NEXUS 15kWh LiFePO4 battery
Ideal For:
-
Off-grid cabins, homesteads, and remote residences needing true 120/240V split-phase power
-
DIY-friendly ESS builds that need scalable storage (15–45kWh) now, with room to expand later
-
Hybrid systems using solar + generator charging capability
User Manual / Documents:
Meet the BigBattery NEXUS + APEX 6.5K Battery Storage Bundle—a clean, scalable ESS built for off-grid power and serious backup performance. Pair the APEX-6.5K split-phase hybrid inverter with 1–3× NEXUS 15kWh LiFePO₄ batteries to build 15kWh, 30kWh, or 45kWh of storage, all on a 48V platform.
This bundle is designed to keep things simple: true 120/240V pure sine wave power, big solar input (10,000W total), and the flexibility to charge from solar plus grid/generator when conditions change. On the storage side, NEXUS adds a rugged floor-standing design with built-in protections, self-heating for cold-weather charging, and integrated aerosol fire suppression—so you can build with confidence and scale as your power needs grow.
Key Features & Benefits
-
Choose your storage: 1×, 2×, or 3× NEXUS (15kWh–45kWh) - Build the capacity you need now and expand later without replacing your core system.
-
True split-phase 120/240V pure sine wave (50/60Hz) - Run essential circuits and larger appliances that require real 120/240V power.
-
6,500W rated output (13,000VA max) - Strong output with surge capability for demanding loads.
-
10,000W PV input with dual MPPT (5,000W + 5,000W) - Capture more solar and support larger arrays for greater day-to-day autonomy.
-
Solar + grid/generator charging support (2 AC inputs: Grid & Generator) - Stay powered when sunlight drops—charge and run loads through changing conditions.
-
Fast charging capability - Up to 140A solar charge and 80A grid/generator charge for quicker recharge cycles.
-
LiFePO4 + integrated BMS protections (NEXUS) - A safer, stable battery chemistry with built-in protection controls.
-
Cold-weather ready (NEXUS self-heating) - Improves charging reliability in colder environments.
-
Integrated aerosol fire suppression (NEXUS) - Adds an extra layer of safety inside the battery unit.
-
Wide battery operating temps - Charge 32°F–113°F, discharge -4°F–113°F for dependable seasonal performance.
-
12-Year Warranty - Long-term coverage to protect your investment.
Specs in a Glance:
Inverter (BigBattery APEX-6.5K)
-
Output: 6,500W rated, 13,000VA max
-
Output Voltage: 120/240 Vac split-phase
-
Battery Voltage: 48V nominal system, 40–60Vdc range
-
Solar Input: Dual MPPT (1+1), 5,000W + 5,000W, 18A + 18A, 125–450Vdc MPPT range, 550Vdc + 550Vdc Voc max
-
Max charging: 140A solar, 80A grid/generator, 140A hybrid
-
AC Inputs: 2 inputs (Grid & Generator)
-
Dimensions / Weight: 25.51 × 16.14 × 5.51 in, 48 lbs
-
Certifications: UL1741, RoHS, FCC Part 15 Class B, IEC62109-1/-2, EN61000 (per spec sheet)
-
Warranty: 5 years
Battery (BigBattery NEXUS 15kWh LiFePO4) — per battery
-
Usable Energy: 15kWh
-
Voltage: 48V system, 51.2V nominal
-
Capacity: 300Ah
-
Max Continuous Discharge: 140A (Max continuous power 7.6kW)
-
Peak Discharge: 270A (1s)
-
Communications: RS485 / RJ45 / CAN
-
Protection Rating: IP54
-
Installation: Indoor floor-standing
-
Dimensions / Weight: 19.7 × 27.5 × 15.7 in, ~315 lbs
-
Battery warranty: (Confirm) (not provided in the supplied specs)
What’s Included:
-
1× BigBattery APEX 6.5K off-grid hybrid inverter
-
Choose: 1× / 2× / 3× BigBattery NEXUS 15kWh LiFePO4 battery
Ideal For:
-
Off-grid cabins, homesteads, and remote residences needing true 120/240V split-phase power
-
DIY-friendly ESS builds that need scalable storage (15–45kWh) now, with room to expand later
-
Hybrid systems using solar + generator charging capability
User Manual / Documents:
BigBattery NEXUS + APEX 6.5K Battery Storage Bundle [15kWh–45kWh] | Indoor Only | 10,000W PV Input / 6,500W AC Output | 5-Year Inverter + 12-Year Battery Warranty
- Regular price
- $4,535.00
- Sale price
- $4,535.00
- Regular price
-
$5,668.75
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![BigBattery NEXUS + APEX 6.5K Battery Storage Bundle [15kWh–45kWh] | Indoor Only | 10,000W PV Input / 6,500W AC Output | 5-Year Inverter + 12-Year Battery Warranty](http://shopsolarkits.com/cdn/shop/files/K0191.png?v=1772732806&width=80){kind=small}
BigBattery NEXUS + APEX 6.5K Battery Storage Bundle [15kWh–45kWh] | Indoor Only | 10,000W PV Input / 6,500W AC Output | 5-Year Inverter + 12-Year Battery Warranty
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"Amazing experience from start to finish. The team was incredibly helpful and the system is performing beyond expectations. Couldn't be happier with our decision."
"The whole process was seamless. From ordering to installation, everything was straightforward. Our electricity bill has dropped significantly!"
"Best investment we've made for our home. The customer support is outstanding — they walked us through every step of the setup process."
"We compared prices everywhere and this was by far the best deal. The quality of the panels is top-notch and installation guidance was superb."
"Great product and even better customer service. They helped us design the perfect system for our needs. Highly recommend to anyone considering solar."
"From the free proposal to the final install, everything exceeded our expectations. We're producing more energy than we consume most months!"
"Amazing experience from start to finish. The team was incredibly helpful and the system is performing beyond expectations. Couldn't be happier with our decision."
"The whole process was seamless. From ordering to installation, everything was straightforward. Our electricity bill has dropped significantly!"
"Best investment we've made for our home. The customer support is outstanding — they walked us through every step of the setup process."
"We compared prices everywhere and this was by far the best deal. The quality of the panels is top-notch and installation guidance was superb."
"Great product and even better customer service. They helped us design the perfect system for our needs. Highly recommend to anyone considering solar."
"From the free proposal to the final install, everything exceeded our expectations. We're producing more energy than we consume most months!"
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Frequently Asked Questions
Find the answers to some of the most common questions customers have before placing their order.
Yes. Our team can help you choose the right solar kit based on your goals, power needs, and location. We provide personalized guidance before and after your purchase at no additional cost.
Many of our customers complete the majority of installation themselves using our diagrams and support resources. For final electrical connections, a licensed electrician may be required depending on local codes.
While we do not directly install systems, we can help connect you with qualified local professionals and provide technical documentation to support your installer.
We stand behind our products. If you have specific questions about returns, eligibility, or specific product conditions, you can learn more in our help center linked below.
All components are backed by manufacturer warranties. In addition, our team provides free lifetime technical support to assist you throughout the life of your system.
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If you're ready to place your order, you can go ahead and checkout online right now. If you have questions, our friendly team of solar experts are happy to assist and can take your order over the phone. If you're interested in financing, you will find the application at checkout online. So whatever is best for you, we are happy to accommodate.
Our team works hard to process all orders within 24-48 hours. Most products ship directly to your door using the quickest, most cost effective ground shipping services depending on size. You’ll receive tracking details and delivery coordination as soon as your order ships. Our average shipping times are anywhere from 3-7 days.
You’ll have direct access to our support team via phone, email, and chat. Whether it’s setup guidance or troubleshooting years down the road, we’re here to help.
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