EcoFlow DELTA Pro Ultra X
12288 Wh, 12000 W
FranklinWH aPower S
Home battery · aPower. Specs from the manufacturer page (checked ).
The FranklinWH aPower S is a 15 kWh (15000 Wh) lithium iron phosphate (LFP) home battery storage unit with 11.5 kW continuous output and 15 kW peak for 10 seconds. It has built-in hybrid inverters and four MPPTs for direct solar (PV) connection, and it can be paralleled with aPower 2 batteries.
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Capacity
15000Wh
Continuous
11500W
Peak / surge
15000W
Solar input
20000W
Chemistry
LiFePO4
Expandable
Yes
Weight
176kg
Warranty
15yr
Key features
- 15 kWh per unit, up to 225 kWh (15 units) per aGate
- Max 11.5 kW continuous / 15 kW peak for 10 seconds
- Four built-in MPPTs, 15 A per MPPT, RTE 90.5%
- Built-in hybrid inverter for direct solar (PV) connection
- Built-in heating blanket for cold-weather performance
- Operates up to 131 °F (55 °C) with derated output; IP67 battery pack and inverter
- Parallel AC-coupled connection with aPower 2 batteries, up to 15 aPowers per system
- Warranty: 15 years or 60 MWh throughput
What it is for
- Whole home backup
- Emergency backup
Specifications
| Capacity | 15000 Wh |
|---|---|
| Continuous output | 11500 W |
| Peak / surge | 15000 W |
| Solar input | 20000 W |
| Expandable | Yes |
| Battery chemistry | LiFePO4 |
| AC output voltage | 120 / 240 V, 120 / 208 V |
| Weight | 176 kg (388.0 lb) |
| Dimensions | 114.9 × 75.0 × 30.0 cm (45.2 × 29.5 × 11.8 in) |
| Warranty | 15 years |
From the FranklinWH page. Values the manufacturer does not publish are left out.
How long it runs common appliances
| Appliance | Watts | Runs? | Hours |
|---|---|---|---|
| Refrigerator (with freezer) | 120 W (600 start) | yes | 11.8 days |
| Chest freezer | 100 W (500 start) | yes | 16.5 days |
| CPAP (no humidifier) | 35 W (40 start) | yes | 14.1 days |
| Gas boiler (pump + controls) | 120 W (300 start) | yes | 8.3 days |
| Wi-Fi router + modem/ONU | 12 W | yes | 41.3 days |
| Starlink (standard dish) | 60 W (100 start) | yes | 8.3 days |
| TV 50" | 75 W | yes | 6.6 days |
| Sump pump 1/2 HP | 920 W (2150 start) | yes | 13 h |
| Well pump 1/2 HP | 880 W (2000 start) | yes | 14 h |
| Space heater 1500 W | 1500 W | yes | 11 h |
Assumes 88 % inverter efficiency, 90 % usable capacity and typical duty cycles. Build your own list in the calculator.
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Connection and wiring
Follow the diagrams in the FranklinWH manual. Connecting to a home panel needs a transfer switch or interlock and a licensed electrician.
Error codes and troubleshooting
We found no error-code table in this manual. Its troubleshooting section is the reference.
FAQ
How long will the FranklinWH aPower S run a refrigerator?
About 283 hours for a typical 120 W refrigerator that runs 35 % of the time, after inverter and depth-of-discharge losses.
Can the FranklinWH aPower S start a sump pump or well pump?
Starting surge matters more than running watts: this unit is rated 15000 W peak. That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.