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

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 WarrantyMeet the BigBattery NEXUS + APEX 6. 5K Battery Storage Bundlea clean, scalable ESS built for off grid power and serious backup performance. Pair the APEX 6. 5K split phase hybrid inverter with 13 NEXUS 15kWh LiFePO 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

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 48V 15kWH NEXUS LiFePO4 Battery Spec Sheet
• BigBattery 48V 15kWH NEXUS LiFePO4 Battery User Manual
• BigBattery APEX 6.5K Off-Grid Hybrid Inverter Spec Sheet
• BigBattery APEX 6.5K Off-Grid Hybrid Inverter User Manual