Description
Overview
The BigBattery APEX 6.5K is a 48V off-grid hybrid inverter that delivers 6,500W of 120/240V split-phase pure sine wave power, with up to 13,000VA of peak output for starting motors up to 4 HP.
It has separate inputs for the grid and a generator, plus two MPPT solar inputs that accept strings up to 550V open circuit (125 to 450V DC operating) for up to 10,000W of solar. It charges at up to 140A from solar or 80A from AC, and switches over in about 10 ms.
Up to six units can run in parallel, and three or more can form a three-phase system.
Who it’s for
- Off-grid cabins, tiny homes and homesteads.
- Homes that need 240V for a well pump or dryer.
- Mid-size 48V solar and battery systems.
Key benefits
- 6.5kW split-phase: 120/240V from one unit.
- Starts motors: 13,000VA peak, up to 4 HP.
- Grid and generator: separate inputs for both.
- High-voltage solar: two MPPTs, 550V open circuit.
- Expandable: up to 6 units in parallel.
Specifications
| Rated output | 6,500W |
|---|---|
| Peak output | 13,000VA |
| Motor load capacity | Up to 4 HP |
| Output voltage | 120/240V AC split-phase (or 120V single-phase), pure sine wave |
| Battery voltage | 48V (40 to 60V DC) |
| Battery types | Lithium, lead-acid or user-defined |
| Solar input | 2 MPPT, 125 to 450V DC operating, 550V DC max open circuit each |
| Switching time | 10 ms typical |
| Parallel | Up to 6 units (3+ units can form three-phase) |
| Communication | RS485, CAN, USB, dry contact; optional Wi-Fi module |
| Enclosure | IP20, indoor only |
| Operating temperature | 14°F to 131°F (derates above 113°F) |
| Noise | Under 60 dB |
| Certifications | UL 1741, FCC Part 15 Class B, IEC 62109-1/-2 |
| Max solar input | 5,000W + 5,000W |
| Max solar charging | 140A |
| Grid/generator charging | 80A |
| AC inputs | 2 (grid and generator) |
| AC input range | 65 to 140V AC |
| Pass-through | 80A |
| Dimensions | 25.51 x 16.14 x 5.51 in |
| Weight | 48 lb (manufacturer figure) |
FAQ
Can it be installed outdoors?
No. BigBattery rates the APEX IP20, for indoor installation only.
Which batteries work with it?
48V lithium (including BigBattery’s ETHOS and HUSKY 2 INV) or lead-acid batteries. Lithium batteries can communicate over CAN or RS485.
Can I get 240V?
Yes. It outputs 120/240V split-phase from a single unit.
Warranty
Manufacturer’s warranty: 5 years, limited. Source: BigBattery product page.
Defective on arrival or within 30 days? You can also return it to us under our Returns & Refunds Policy. See how warranty claims work.
Reviews
There are no reviews yet.