BigBattery
BigBattery NEXUS 42.9kWh Off-Grid Battery & Inverter Kit — 3 NEXUS Batteries + 1 EG4 12000XP V2 Off-Grid Inverter
BigBattery NEXUS 42.9kWh Off-Grid Battery & Inverter Kit — 3 NEXUS Batteries + 1 EG4 12000XP V2 Off-Grid Inverter
SKU: K0156
- Regular price
- $10,729.99
- Regular price
- $11,820.00
- Sale price
- $10,729.99
- Unit price
- per
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- Warranty information is listed in this product's details.
Build a high-capacity off-grid system around serious solar and split-phase power.
This off-grid kit combines 42.9kWh of nominal NEXUS storage with 1 EG4 12000XP V2 Off-Grid Inverter. It is suited to cabins, workshops and independent homes that need clearly matched battery quantity, 120/240V output and room to integrate solar or generator charging.
Why it earns a closer look
Useful capability, explained in buying language.
Storage sized to the project
42.9kWh of nominal capacity gives the installer a concrete starting point for load and runtime planning.
Battery-powered split-phase output
12kW from battery from the EG4 12000XP V2, with operating limits stated separately from battery capacity.
High capacity per battery
Each NEXUS contributes 14.3kWh, reducing enclosure count for larger off-grid storage targets.
Designed around off-grid priorities
Split-phase 120/240V output and solar or generator charging support independent properties without relying on grid sellback.
Where it fits
- Off-grid homes, cabins and remote properties
- Workshops and small commercial sites needing 120/240V split-phase power
- Solar-plus-generator systems designed around independent operation rather than grid export
System-fit guidance
The configured battery-bank continuous rating meets or exceeds the combined inverter battery-powered rating; final conductor, protection and surge design still requires engineering review. Off-grid with generator and AC bypass support; does not sell power back to the grid
What’s included
- 3 × BigBattery NEXUS Batteries
- 1 × EG4 12000XP V2 Off-Grid Inverter
Typically still required
- Solar panels and array racking
- Permitting, utility interconnection and installation labor
- Site-specific conductors, conduit, disconnects, overcurrent protection and grounding unless itemized in a written order confirmation
Frequently asked questions
What exactly comes in this kit?
Are solar panels included?
How long will 42.9kWh run my loads?
Can this off-grid kit sell power back to the grid?
Is the complete kit UL 9540 certified?
What warranty applies?
Know what arrives—and what the installation still needs.
Send Torven Power your loads, existing equipment and project goals for pre-purchase fit guidance.
Specifications, images and package contents can change by hardware revision. The delivered model label, current manual, written warranty and permitted design control.
Product Data
Technical Specifications
System Summary
| Product SKU | K0156 |
|---|---|
| System type | Off-grid battery and inverter kit |
| Nominal battery voltage class | 51.2V / 48V-class |
| Total nominal storage | 42.9kWh |
| Battery configuration | 3 × BigBattery NEXUS Batteries |
| Inverter configuration | 1 × EG4 12000XP V2 Off-Grid Inverter |
| Configured battery-bank continuous rating | 22.8kW |
| Combined inverter battery-powered rating | 12kW |
| Power-sizing note | The configured battery-bank continuous rating meets or exceeds the combined inverter battery-powered rating; final conductor, protection and surge design still requires engineering review. |
| AC topology | 120/240V split phase |
| Operating mode | Off-grid with generator and AC bypass support; does not sell power back to the grid |
| Solar panels included | No |
| Certification scope | No blanket system-level UL 9540 claim is made for this off-grid bundle; component listings and testing vary by exact model. |
Battery System Specifications
| Battery family | BigBattery NEXUS LiFePO4 floor-standing battery |
|---|---|
| Battery quantity | 3 × NEXUS batteries |
| Capacity per battery | 14.3kWh (51.2V, 280Ah) |
| Total nominal capacity | 42.9kWh |
| Continuous discharge per battery | 140A / 7.6kW |
| Peak discharge per battery | 270A for 1 second |
| Maximum charge current per battery | 140A |
| Communications | CAN, RS485 and RJ45 |
| Thermal and safety features | Self-heating and integrated fire-suppression features |
| Enclosure / placement | IP54; indoor floor installation |
| Dimensions per battery | 19.7 × 27.5 × 15.7 in |
| Weight per battery | 315 lb |
| Approximate battery weight in this configuration | 945 lb |
| Expansion | Manufacturer states up to 15 batteries / 214.5kWh; confirm current communications and installation limits |
| Battery warranty | 12-year limited warranty; current written terms control |
Inverter Specifications
| Inverter family | EG4 12000XP / current V2-family off-grid inverter |
|---|---|
| Exact shipped MPN | Confirmation required: IV-12000-XP-IN-01 versus IV-15000-XP-IN-01 |
| Battery-powered AC output | 12kW |
| PV-assisted AC output | Do not publish a precise value until the shipped MPN is confirmed |
| AC topology | 120/240V split phase |
| Usable / maximum PV array | 24kW usable / 28kW maximum |
| MPPT channels / input current | 2 × 35A |
| AC bypass | 100A |
| Generator input | 63A |
| Grid export | No sellback |
| Weight | 104.7 lb |
| Inverter warranty | 5-year limited warranty; current written terms control |
Included Components
| Verified item 1 | 3 × BigBattery NEXUS Batteries |
|---|---|
| Verified item 2 | 1 × EG4 12000XP V2 Off-Grid Inverter |
| Not included 1 | Solar panels and array racking |
| Not included 2 | Permitting, utility interconnection and installation labor |
| Not included 3 | Site-specific conductors, conduit, disconnects, overcurrent protection and grounding unless itemized in a written order confirmation |
| Confirmation needed 1 | No additional battery cables, breakers, disconnects, communications accessories or mounting hardware are itemized in the current supplier BOM. |
Verify the delivered model and hardware revision against the current manual and installation requirements.
Why Buy From Us
Shop with confidence at Torven Power.
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Ordering Information
Shipping & Returns
Shipping: BigBattery batteries, inverters, panels and kits may ship by parcel or LTL freight. Stock, lead time, residential delivery, liftgate service and remote-area charges can vary. Checkout terms or Torven Power’s written order confirmation control.
Returns: Eligibility depends on timing, product condition, installed or energized status, freight costs, supplier authorization and product-specific exclusions. Review the current policies before ordering.
Review the Shipping Policy and Return & Refund Policy before purchase.
BigBattery
BigBattery NEXUS 42.9kWh Off-Grid Battery & Inverter Kit — 3 NEXUS Batteries + 1 EG4 12000XP V2 Off-Grid Inverter
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