Why this one
Medium tier: the cheapest in-stock UK-socket station found in Ireland that meets the medium tier's 1000 Wh, 1000 W and 2000 W surge reference. The Solar Lab tested it hands-on and measured about 83% inverter efficiency.
Specifications and sources
- Stored energy
- 1024 Wh; LiFePO4; not expandable
- Charging
- AC charging up to 1400 W
- Weight
- 12.1 kg
What independent testers found
The Solar Lab
Hands-on testing of the US model over several days found it quiet, quick to recharge and about 83% efficient through the inverter. The testers call it a low-frills entry model and note it cannot take an extra battery.
The Solar Lab test ↗, checked 2026-10-31
What owners report
About 1,300 Amazon US ratings average 4.7 of 5 for the US model. Owners mostly mention reliable backup and easy setup; ratings do not establish a failure rate and the UK version was not separately sampled.
Limits and cautions
- The independent test and owner ratings are for the US model with US sockets. The Irish offer is the UK model, SKU EFDELTA3C-UK-L.
- Two AC sockets only. It cannot be expanded with an extra battery.
- X-Boost is separate from the surge rating and must not be treated as normal continuous output.
- Check each appliance's running and starting watts before connecting it. Any runtime shown is a paper estimate, not a guarantee.
- This selection excludes medical equipment. Hard-wired loads need an electrician; never feed a wall socket.