BLUETTI Apex 300 + B500K review
BLUETTI Apex 300 with B500K Expansion Battery (7,884.8Wh)
By Tom Calder
The Apex 300 (2,764.8 Wh, 3,840 W, 7,680 W lifting power) with a 5,120 Wh B500K battery: 7,884.8 Wh in all, with 120V and 240V outlets that work at the same time, even while charging. BLUETTI's Home Integration Kit connects it to chosen house circuits through a Reliance sub panel and a 50 A inlet.
- Best for
- 7.9 kWh with 120V and 240V at the same time
- Skip it if
- You need more than 3,840 W at once
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Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- 7,884.8 Wh as sold
- 120V and 240V at once
- Up to 6,400 W of solar when fully equipped (maker)
Worth knowing
- 3,840 W output: about half the 7 kW systems
- BLUETTI's own store says the Apex 300 ships from early December
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Who shouldn't buy this
Don't buy it if you need more than 3,840 W at once.
Key specs
| Battery (as sold) | 7,884.8 Wh |
| AC output | 3,840 W |
| 240V | Yes, from one unit (NEMA 14-50) |
| Expands to (maker) | Up to 6 batteries per unit; 58 kWh with three units |
| Warranty | 5 years |
| Runs (our estimate) | Fridge 2.7–5.7 days; fridge + furnace fan 8.7–12 h; well pump 6–7.9 h running |
| Connecting to the house | Plugs into a home inlet box; BLUETTI's Apex 300 Home Integration Kit (Reliance sub panel and 50A inlet) for house circuits, installed by a qualified electrician |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the US price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for Whole-home backup that starts big motors
See the comparison →
Best for The most power: 12 kW at 120V and 240V
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Best for The whole-house kit: battery and 32-circuit panel together