Bluetti EnergyPro 13K
19200 Wh, 13200 W
Fortress Power eVault Max 18.5
Home battery · eVault Max. Specs from the manufacturer page (checked ).
The Fortress Power eVault Max 18.5 is a home battery with 18.43 kWh rated capacity, using LiFePO4 (lithium iron phosphate) chemistry. Its recommended continuous discharge rate is 9.2 kW, with a 12.8 kW surge for 5 seconds. It is AC/DC coupled to solar arrays and can be scaled up to 370 kWh.
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Capacity
18430Wh
Continuous
9200W
Peak / surge
12800W
Chemistry
LiFePO4
Cycles
8000
Expandable
Yes
Weight
235.87kg
Warranty
10yr
Key features
- Rated capacity 18.43 kWh at 0.5C (nominal 51.2V, 360Ah)
- Recommended continuous discharge 9.2 kW (180A); peak 12 kW for 30 min; surge 12.8 kW for 5 sec
- Scalable up to 20 modules in parallel (370 kWh)
- AC/DC coupled to solar arrays
- Rated 8,000 cycles at 80% depth of discharge; 10-year warranty
- Intelligent BMS with advanced cell-level monitoring and balancing
- Touch screen LCD performance display
- IP55 industrial-grade aluminum enclosure; serviceable top cover
What it is for
- Off-Grid
- Back Up Power
- Self-Supply
- Peak Charge Reduction
Specifications
| Capacity | 18430 Wh |
|---|---|
| Continuous output | 9200 W |
| Peak / surge | 12800 W |
| Expandable | Yes |
| Battery chemistry | LiFePO4 |
| Cycle life | 8000 cycles |
| Weight | 235.87 kg (520.0 lb) |
| Dimensions | 51.5 × 51.5 × 107.3 cm (20.3 × 20.3 × 42.2 in) |
| Warranty | 10 years |
From the Fortress Power 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 | 14.5 days |
| Chest freezer | 100 W (500 start) | yes | 20.3 days |
| CPAP (no humidifier) | 35 W (40 start) | yes | 17.4 days |
| Gas boiler (pump + controls) | 120 W (300 start) | yes | 10.1 days |
| Wi-Fi router + modem/ONU | 12 W | yes | 50.7 days |
| Starlink (standard dish) | 60 W (100 start) | yes | 10.1 days |
| TV 50" | 75 W | yes | 8.1 days |
| Sump pump 1/2 HP | 920 W (2150 start) | yes | 16 h |
| Well pump 1/2 HP | 880 W (2000 start) | yes | 17 h |
| Space heater 1500 W | 1500 W | yes | 14 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 Fortress Power manual. Connecting to a home panel needs a transfer switch or interlock and a licensed electrician.
Open the Fortress Power manual (PDF) →
Error codes and troubleshooting
We found no error-code table in this manual. Its troubleshooting section is the reference.
FAQ
How long will the Fortress Power eVault Max 18.5 run a refrigerator?
About 348 hours for a typical 120 W refrigerator that runs 35 % of the time, after inverter and depth-of-discharge losses.
Can the Fortress Power eVault Max 18.5 start a sump pump or well pump?
Starting surge matters more than running watts: this unit is rated 12800 W peak. That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.