The Bluetti EP900 is a 9 kW, 120/240-volt hybrid inverter that pairs with two to four B500 lithium iron phosphate battery packs for 9.92 to 19.84 kWh of storage, according to Bluetti’s EP900 user manual. It accepts up to 9 kW of solar, switches to off-grid power in under 10 milliseconds, and carries a 10-year warranty and UL 9540 system certification. Unlike Bluetti’s portable power stations, the EP900 is a fixed residential system installed by qualified professionals. This review uses Bluetti’s manuals and product pages, and also covers Bluetti’s newer EnergyPro 13K. We haven’t tested either ourselves.
Bluetti EP900 Specs
| Spec | EP900 inverter |
|---|---|
| Rated output (on- and off-grid) | 9,000 W at 240 V (7,600 W with only two B500) |
| Output voltage | 120 V / 240 V split-phase, 60 Hz |
| Off-grid overload | 13,500 VA for 10 s; 9,900 VA for 10 min |
| Switching time | Under 10 ms |
| PV input | 9,000 W max; 2 MPPTs (3,000 W + 6,000 W); 150–500 V |
| Max grid input | 13,920 VA (bypass + grid charging) |
| Round-trip efficiency | More than 85% (AC to AC) |
| Enclosure | NEMA 4X; forced-air cooling; 50 dB(A) or less |
| Weight | 92.59 lb (48 kg) |
| Certifications | UL 9540 (system), UL 1741, IEEE 1547, IEEE 2030.5, California Rule 21 |
| Warranty | 10 years |
Source: Bluetti EP900 user manual.
B500 Battery Pack Specs
| Spec | B500 |
|---|---|
| Rated capacity | 4,960 Wh |
| Usable capacity | 4,464 Wh (90% DoD) |
| Battery voltage | 99.2 V |
| Chemistry | LiFePO4 |
| Max charge / discharge current | 25 A / 50 A |
| Packs per EP900 | 2 to 4, stacked on the ground |
| Enclosure | IP65 |
| Weight | 127.86 lb (58 kg) each |
| Compliance | UL 9540, UL 9540A, UL 1973, IEC 62619, UN38.3 |
Source: Bluetti EP900 user manual.
With four packs, the EP900 holds 19.84 kWh rated and about 17.9 kWh usable (4 × 4.464).
What the Specs Mean
- Two packs limit power. Bluetti says the EP900 delivers 7.6 kW with two B500 packs and its full 9 kW with three or four. Grid input with two packs is limited to 6,000 W.
- Whole-home split-phase output. 120/240 V means it can run 240 V loads like a well pump, within its power limits.
- Utility programs. The manual says the system supports the IEEE 2030.5 protocol and remote scheduling through an IoT module, which grid programs in California use.
- Cold-weather limits. B500 packs charge between 32 and 104 °F, per the manual, so placement matters in cold climates.
EP900 Operating Modes
The manual lists four operating modes, which owners select in the BLUETTI app:
- Backup: the EP900 holds its charge and only supplies the home when the grid fails. It charges from solar first and the grid second, which suits areas with frequent outages.
- Time of Use: owners set charge and discharge windows and charging power. The system typically charges from the grid during off-peak hours and discharges during expensive ones. State-of-charge limits can reserve room in the battery for solar.
- Self-consumption: the home uses solar directly first, and surplus solar charges the battery for evening peak hours or outages.
- Custom: owners combine the settings above to suit their plan.
The manual’s wiring diagrams show both partial-backup and self-consumption-with-partial-backup layouts. The inverter’s communication port includes a dry-contact relay for starting a generator.
Bluetti EnergyPro 13K: The Newer Option
In March 2026, Bluetti launched the EnergyPro 13K (EP13K) in the US as its next-generation whole-home system. Bluetti still sells the EP900, but Energy-Storage.news described the EnergyPro line as largely replacing it. The EP13K uses new EnergyPack 500 batteries rather than B500 packs.
| Spec | EnergyPro 13K | EP900 |
|---|---|---|
| Rated output | 13,200 W (with four packs) | 9,000 W (7,600 W with two packs) |
| Battery packs | 2–4 EnergyPack 500 | 2–4 B500 |
| Rated capacity | 9.6–19.2 kWh | 9.92–19.84 kWh |
| Usable per pack (90% DoD) | 4.32 kWh | 4.464 kWh |
| Solar input | 22,000 W max; 4 MPPTs | 9,000 W max; 2 MPPTs |
| Surge | 150 A LRA (under 500 ms) | 13,500 VA for 10 s |
| Switchover to backup | Under 20 ms | Under 10 ms |
| Max grid input | 37,200 VA (155 A), bypass + charging | 13,920 VA |
| Inverter weight | 105.8 lb | 92.59 lb |
| Certifications | UL 9540 (system), UL 1741, IEEE 1547, Rule 21 | UL 9540 (system), UL 1741, IEEE 1547, Rule 21 |
| Warranty | 10 years | 10 years |
Sources: Bluetti EnergyPro 13K user manual and EP900 user manual.
Like the EP900, the EP13K’s full output depends on battery count: Bluetti’s manual says output decreases when only two or three EnergyPack 500 units are connected. Each EnergyPack 500 is a 48 V LiFePO4 pack weighing 127.86 lb, NEMA 4X rated, with up to four stacked on the ground. Bluetti pairs the EP13K with its optional AT1 Smart Distribution Panel, a 200 A panel with connections for the grid, generator, EV charger and solar.
EP900 or EnergyPro 13K? The EP13K suits homes with large solar arrays or heavy loads such as a 5-ton central air conditioner, which Bluetti says it can run. The EP900 still fits homes that need 9 kW or less, and existing EP900 owners keep their B500 packs and 10-year warranty.
How It Compares to Powerwall 3, Enphase 5P and FranklinWH
| Spec | Bluetti EP900 (4 × B500) | Tesla Powerwall 3 | Enphase IQ Battery 5P | FranklinWH aPower 2 |
|---|---|---|---|---|
| Energy | 19.84 kWh rated; 17.9 usable | 13.5 kWh | 5.0 kWh | 15 kWh |
| Continuous power | 9 kW | Up to 11.5 kW | 3.84 kVA | 10 kW |
| Built-in solar input | 9 kW | 20 kW | No (microinverters) | No |
| Chemistry | LFP | LFP | LFP | LFP |
| Warranty | 10 years | 10 yr, 70% (US) | 15 yr or 6,000 cycles | 15 yr or 60 MWh |
Figures from each maker’s US documents.
- Versus Powerwall 3: Powerwall 3 offers more power and more solar input per unit. The EP900 with four packs stores more energy. See our Tesla Powerwall 3 review.
- Versus Enphase and FranklinWH: those carry 15-year warranties and are AC-coupled. The EP900 combines solar input and storage in one system. Compare them in Powerwall 3 vs Enphase vs FranklinWH.
Who It Suits
- Homes that want 10 to 20 kWh of backup with a built-in 9 kW solar inverter.
- Owners adding a battery system without existing solar, since it can charge from the grid. See home battery backup without solar.
- Shoppers who know Bluetti’s portable products and want a permanent home system.
Who Should Look Elsewhere
- Homes with large solar arrays over 9 kW, unless they’re AC-coupling existing panels.
- Homes that need more than 9 kW continuous from a single system.
Sizing Example
Illustrative inputs: a home wants to keep essential loads running overnight, about 12 kWh across 10 hours with a 3 kW peak.
- Energy: 12 ÷ 4.464 = 2.7, so three B500 packs (13.4 kWh usable).
- Power: three packs unlock the full 9 kW, well above the 3 kW peak.
- Margin: a fourth pack adds 4.464 kWh usable for cloudy days.
- Solar: up to 9 kW of panels split across the 3 kW and 6 kW MPPT channels.
What’s in the System
Bluetti’s manual describes the EP900 system as the inverter, B500 battery packs, an IoT controller, and accessories including current transformers, rapid shutdown devices, safety switches and cables. Owners monitor and control it through the BLUETTI app over Wi-Fi or Bluetooth. The manual says installation, commissioning and maintenance should only be done by qualified professionals, and Bluetti’s product page mentions an optional installation service.
Battery Care Notes From the Manual
Bluetti recommends fully charging and discharging the system every 3 months to keep the battery healthy. Before storing the system, it should be charged to 40–60%. Stored packs need at least one charge cycle per month across the wider storage range (−4 to 104 °F), or one every six months when kept between 32 and 95 °F. Each B500 weighs about 128 lb, and the manual recommends three people for items between 70.5 and 121.3 lb and four people or a cart above that, so installers should plan for handling.
Questions to Ask an Installer
- Three or four B500 packs, so the system gets its full 9 kW?
- Will the EP900 back up the whole panel or a critical loads panel?
- Where will the packs sit, given their charging temperature range?
- Will existing solar be connected to the EP900’s MPPT inputs or AC-coupled?
Price and Incentives
EP900 prices vary by retailer and installer, and we aren’t publishing one we can’t verify. Bluetti’s launch announcement priced the EnergyPro 13K with two EnergyPack 500s from $7,919 during an April 2026 promotion. There’s no 30% federal credit for homeowner-owned systems installed after December 31, 2025 (IRS).
Electrical work can be dangerous: follow the manual, fuse and size every cable correctly, and use a licensed electrician for anything connected to household wiring.
FAQ
How much does the Bluetti EP900 store?
Two to four B500 packs give 9.92 to 19.84 kWh rated. Each pack has 4.464 kWh usable at 90% depth of discharge.
How much power does the EP900 provide?
9 kW at 240 V with three or four packs, and 7.6 kW with two.
Is the Bluetti EP900 a portable power station?
No. It’s a fixed residential energy storage system installed by qualified professionals.
What is the EP900 warranty?
Bluetti lists a 10-year warranty for the EP900.
Does the EP900 work without solar?
Yes. It can charge from the grid, for example during off-peak hours in Time of Use mode, and back up the home during outages.
Is there a newer Bluetti home battery than the EP900?
Yes. The EnergyPro 13K, launched in the US in March 2026, offers 13.2 kW with four EnergyPack 500 packs, up to 19.2 kWh and 22 kW of solar input.
Sources: Bluetti, EP900 user manual, EP900 + B500 product page and product warranty period page (bluettipower.com); Bluetti, EnergyPro 13K user manual and launch announcement (PR Newswire, March 31, 2026); Energy-Storage.news, “Bluetti launches new EnergyPro 13K energy storage system in the US” (April 7, 2026); Tesla Powerwall 3 Datasheet; Enphase IQ Battery 5P datasheet; FranklinWH aPower 2 datasheet; IRS, Residential Clean Energy Credit. Accessed Oct 2026.
Related: Home Solar and Battery Guide 2026, EcoFlow DELTA Pro Ultra Review, How Many Batteries to Power a House
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