BigBattery Nexus 2 16kWh
For off-grid cabins and homesteads that need a lot of heated storage for the least money and don’t need UL paperwork. Grid-tied homes facing inspection should pick a UL 9540 battery instead.
BigBattery $2,990$2,990
3.8/5
The wall-mount version of the CoreX 5 Pro, for indoor systems where a rack doesn’t fit. Choose a UL-listed battery if your permit needs one.
- 5.1 kWhCapacity
- 100 AOutput
- 5,000Cycles
- NoUL 9540A
- 10 yearsWarranty
Check price at Amazon$1,250
Price checked October 24, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Slim wall-hung case keeps the floor clear
- Color screen plus Bluetooth and WiFi app
- EVE cells rated 5,000 full-depth cycles
- Built-in breaker simplifies wiring
Cons
- No UL 1973 listing
- Stops charging below about 39 °F, and must be installed indoors
- Costs $100 more than the rack-mount CoreX 5 Pro
The SunGoldPower CoreX 5 family
Every SunGoldPower CoreX 5 model we rank, smallest first. Ratings compare each against its own case.
| Model | Capacity | Rating | Price |
|---|---|---|---|
| SunGoldPower CoreX 5 Pro | 5.1 kWh | 3.9/5 | $1,150 |
| SunGoldPower CoreX 5 Elite (this one) | 5.1 kWh | 3.8/5 | $1,250 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its case. How we rank explains each one.
Specifications
| Model number | CoreX 5 Elite |
|---|---|
| Capacity | |
| Case | Wall or floor mount |
| Nominal voltage | 51.2 V |
| Capacity | 100 Ah |
| Energy | 5.1 kWh |
| Chemistry | LiFePO4 |
| Cycle life | 5,000 at 100% depth |
| Power | |
| Continuous discharge | 100 A |
| Max charge current | 95 A |
| Modules in parallel | Up to 15 |
| Safety and communication | |
| UL 1973 | No |
| UL 9540A | No |
| UL 9540 | No |
| Communication | CAN, RS485 |
| Self-heating | No |
| App | Yes |
| Build | |
| Display | Yes |
| Built-in breaker | Yes |
| Enclosure | IP20 |
| Dimensions | 22.05 x 18.9 x 5.39 in |
| Weight | 105.8 lb |
| Warranty | 10 years |
| Released | 2026-04 |
Alternatives in this case
Fortress Power eVault MAX 18.5
One of the largest single 48 V batteries sold, for whole-home or light-commercial systems installed by a dealer. Expect to pay dealer prices and plan for a heavy floor-standing cabinet.
Solamp $6,479$6,479
BigBattery 48V Husky 2 INV
For RV, van and small off-grid systems that need a rugged, weatherproof 48 V battery that talks to the inverter. Home systems that stay indoors get more for the money from a rack battery.
BigBattery $1,580 Signature Solar $1,580$1,580
Compare
Compare the SunGoldPower CoreX 5 Elite with any other 48V solar battery →
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