Head to head
sonnenCore+ 10 kWh vs Bluetti EP900 + 2x B500
sonnen · Home Battery System
sonnenCore+ 10 kWh
~$9,500
4,800 W / 8,640 W surge · up to furnace blower, sump pump or a window AC
Bluetti · Home Battery System
Bluetti EP900 + 2x B500
~$10,298
7,600 W · up to well pump or a small central AC
Quick takeThe sonnenCore+ 10 kWh lists about $798 lower; the Bluetti EP900 + 2x B500 puts out more sustained power (7,600 W); the sonnenCore+ 10 kWh is quieter at 25 dB.
| Spec | sonnenCore+ 10 kWh | Bluetti EP900 + 2x B500 |
|---|---|---|
| Approx. price | ~$9,500 | ~$10,298 |
| Type | Home Battery System | Home Battery System |
| Fuel | Battery (LiFePO4) | Battery (LiFePO4) |
| Running / output watts | 4,800 W | 7,600 W |
| Starting / surge watts | 8,640 W | — |
| Battery capacity | 10,000 Wh | 9,920 Wh |
| Expandable to | 60,000 Wh | 19,840 Wh |
| Noise | 25 dB | 50 dB |
| Runtime | Fridge (~150W): ~60 hrs on one 10 kWh unit; essentials (~1kW): about 9 hrs | Fridge (~150W): ~60 hrs on two B500 packs; whole-home essentials (~1kW): about 9 hrs |
| Outlets | None — hardwired; AC-coupled with 35 A pass-through for a backup subpanel, 200 A with the AC Connections module | None — hardwired; 120/240V split-phase output through the home's backup panel, 9 kW on-grid / 7.6 kW off-grid |
| Fuel tank | — | — |
| Weight | 353 lbs | 105.8 lbs |
| Transfer-switch ready | Yes | Yes |
| Warranty | 10-year or 10,000-cycle system warranty | 10-year limited |
Highlighted cell is the better figure for that row.
Owner pros and cons
sonnenCore+ 10 kWh
- +Spec-sheet noise under 25 dB, quiet enough for a living-space wall
- +Stackable to 60 kWh as 10 kWh or 20 kWh cabinets
- +10-year / 10,000-cycle warranty covers the inverter too
- +UL 9540 and UL 1741 listings on the spec sheet
- +Eligible for sonnen VPP programs where offered
- −4.8 kVA continuous is low for whole-home backup
- −Round-trip efficiency peaks near 85%, below most competitors
- −Cabinet weighs 353 lb and must be mounted indoors (IP30)
- −Few installers carry sonnen in the US
- −Stacking must be all-10 kWh or all-20 kWh, no mixing
Bluetti EP900 + 2x B500
- +Packs add in 4.96 kWh steps up to 19.8 kWh per inverter
- +Inverter takes up to 9 kW of PV input and charges while it backs up
- +IP65 enclosure suits garage or outdoor wall mounting
- +Under 10 ms switching keeps computers and routers up through a cut
- +Lower entry cost than a Powerwall or Enphase installation
- −Off-grid output is 7.6 kW, below the 9 kW headline
- −Each B500 is about 128 lb, so a stack is awkward to install
- −Few certified installers; electrician familiarity is hit or miss
- −No surge rating published for motor starts
- −Datasheet lists the inverter at up to 50 dB, audible near bedrooms