EcoFlow STREAM AC Pro vs Marstek Venus E
A side-by-side look at the EcoFlow STREAM AC Pro and Marstek Venus E. Winning figures are highlighted.
| EcoFlow EcoFlow STREAM AC Pro | Marstek Marstek Venus E | |
|---|---|---|
| Price from | £789 | £999 |
| Usable capacity | 1.92 kWh | 5.12 kWh |
| Max expandable | 11.52 kWh | 5.12 kWh |
| Max AC output | 800 W | 800 W |
| Max PV input | 0 W | 0 W |
| Cycle life | 6000 | 6000 |
| Weatherproofing | IP65 | IP65 |
| App control | Yes | Yes |
| AC-coupled (works without panels) | Yes | Yes |
Best value per row highlighted. Prices last checked 15 October 2026.
EcoFlow STREAM AC Pro
The natural upgrade path if you started with a STREAM microinverter: stack it under the inverter and your clipped surplus goes into storage instead of nowhere. It's the most readily available of these batteries in the UK, but plug-in batteries can't currently be self-installed in Great Britain, so for now it needs an electrician-installed connection.
Full EcoFlow STREAM AC Pro reviewMarstek Venus E
Different from the rest: the Venus E has no solar input; it's a plug-in battery for off-peak tariff arbitrage, popular in Germany. In Great Britain plug-in batteries can't be self-installed under the current rules, so it would need a hardwired installation by an electrician.
Full Marstek Venus E review