MARSTEK Venus D vs Zendure SolarFlow 800
Technical comparison · Modular
Both feed at most 800 VA into the grid, so the difference sits upstream: the Venus D takes up to 4000 W of panels and doubles as a UPS, while the SolarFlow 800 stops at 1200 W and has no backup output. Figures are manufacturer-declared.
| Parameter | ||
|---|---|---|
| Awards | — | |
| In brief | ||
| List price | 725 € | — |
| Weight | 28 kg | 5 kg |
| Dimensions (W×D×H) | 48 × 38.5 × 13.5 cm | — |
| How long it lasts | ||
| Battery life cycles | 3650 cicli | 4380 cicli |
| The limit that runs out first | anni di garanzia | anni di garanzia |
| Warranty | 10 anni | 12 anni |
| Identity | ||
| Use tier | F1 — Outlet-sized (up to 1 kWh) | F1 — Outlet-sized (up to 1 kWh) |
| Price | ||
| Price | 599 € | — |
| Category specs | ||
| Expandable | Yes | Yes |
| Maximum expanded capacity | 15.36 kWh | 11.52 kWh |
| Battery voltage | — | 48 V |
| Feed-in limit | 800 VA | 800 VA |
| Inverter included | — | Yes |
| Maximum solar input | 4000 W | 1200 W |
| MPPT trackers | 4 | 2 |
| Grid charging | Yes | Yes |
| Maximum charge power | 2.2 kW | 1.2 kW |
| Dynamic tariffs | Built in | Built in |
| Backup power | UPS | None |
| Backup output | 2200 W | — |
| Switchover time | 15 ms | — |
| Ingress protection | IP65 | IP65 |
| Mounting | Floor standing | — |
| Minimum temperature | -20 °C | -20 °C |
| Maximum temperature | 60 °C | 55 °C |
| Declared standards | — | VDE-AR-N 4105, EN 50549 |
JouleSpecs Awards
Lowest price range Outlet-sized (up to 1 kWh)
The lowest list price among the sheets in the Modular category (outlet-sized tier): €599. The next one has a list price of €999. List prices as published by the manufacturers.
How we assign awards →No awards in this tier.
The differences that matter
- Solar input, 4000 W vs 1200 W, with 4 trackers vs 2 → the Venus D takes more panels, even at different orientations, without extra hardware; the SolarFlow 800 saturates sooner.
- Backup: UPS up to 2200 W in 15 ms vs none → only the Venus D powers the house during a blackout.
- Maximum charging, 2.2 kW vs 1.2 kW → the Venus D fills faster from the grid in cheap-tariff hours.
- Warranty, 10 years vs 12 → two more years of cover on the SolarFlow 800.
Which one to choose
Choose MARSTEK Venus D if…
you have more panels than a single input can carry, maybe on different roof faces: 4 MPPT trackers and up to 4000 W of input, grid charging at 2.2 kW and, if the power goes, 2200 W of backup with a 15 ms switchover. You accept a 10-year warranty instead of 12 and a 28 kg unit that sits on the floor.
Choose Zendure SolarFlow 800 if…
the installation is a balcony with a few panels: 2 MPPT trackers and 1200 W of input are enough, the warranty runs 12 years and the system expands up to 11.52 kWh. You give up backup power and grid charging tops out at 1.2 kW.
Where to buy
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