The Flexopower Lithium700-SB50 adds more capacity and output with a 672Wh LiFePO4 pack, 700W pure sine inverter, aluminium casing and an Anderson SB50 DC output.
It is a strong choice for serious overlanding setups, off-grid camping and load-shedding where you want to power a National Luna dual fridge plus small electronics.
The gentle fast-charge profile and replaceable battery support long service life, while integrated MPPT means easy plug-and-play solar charging.
Estimated runtimes with National Luna dual fridge/freezers*
*Approximate values in mild conditions, mixed fridge/freezer use, single appliance only. Real-world runtimes will vary with ambient temperature, packing, and settings.
| Appliance | Estimated runtime |
|---|---|
| National Luna 50L Dual fridge/freezer | up to approx 15.0 hours |
| National Luna 60L Dual fridge/freezer | up to approx 13.5 hours |
| National Luna 72L Dual fridge/freezer | up to approx 11.0 hours |
| National Luna 90L Dual fridge/freezer | up to approx 9.5 hours |
Specifications
| Battery cycle life | 2000 cycles to ≥80% capacity, around 10 years of typical use |
|---|---|
| Battery chemistry | LiFePO4 (Lithium Iron Phosphate), replaceable module |
| Battery capacity | 672Wh / 210 000mAh / 3.2V |
| AC output | 700W continuous (1400W peak), 230V, 50Hz, pure sine wave |
| DC output |
1 × 13.5V / 12A regulated cigarette lighter 2 × 13.5V / 12A DC5521 barrel plugs 2 × USB-A Fast Charge 5V / 2.4A (18W per port) 1 × USB-C PD 18W 1 × USB-C PD 100W |
| Charging inputs |
AC 230V, 400W gentle fast charge Solar PV up to 400W, 10–60V, max 10A (integrated MPPT, XT60 input) 12V vehicle charging up to 117W |
| UPS | True UPS with 20ms transfer time, max 700W load |
| Display | Full LCD system display |
| Weight | 9.3kg |
| Dimensions (L × W × H) | 315 × 190 × 220mm |
| Safety protections |
Short circuit, over-current, over-voltage, low-voltage, overload, over-temperature |
| Included accessories |
AC charger cable Car charger Solar cable with XT60 and grey Anderson SB50 User manual |
| Operating temperature | 0°C to 45°C |
| Warranty | 2 years |
| Certification | CE, FCC, RoHS, PSE |



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