EcoFlow RIVER 3 Max Plus
The biggest River 3, with 858 Wh, 990 W AC and a 10 ms UPS switchover, in a box that still fits under a desk.
Tracked 2026-09-21. The retailer listing is the price you pay.
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Our take on the EcoFlow RIVER 3 Max Plus
The EcoFlow RIVER 3 Max Plus is a 286Wh power station bundled with a 572Wh extra battery, for long streams.
The tracked price is $369, flat across five points from August 26 to September 21, 2026, so there is no range to read. Tracking also stopped on September 21. The listing gives 600W continuous output, 1200W with X-Boost and a UPS switch under 10 ms. It lists seven outlets, a LiFePO4 battery rated for 3,000 cycles and app control. The weight is 8.4 kg. Rated 4.4 across 96 retailer ratings.
- Extra 572Wh battery included in the bundle
- UPS switchover under 10 ms for a PC
- LiFePO4 rated for 3,000 cycles
- Weighs 8.4 kg
- Price tracking stops at September 21
- 600W continuous limits heavy loads
Where it fits in a build
Keeps the rig alive. Match the output ports and wattage to your gear, and stay under 100Wh for air travel. See every power bank / portable battery pick
| Capacity | 858Wh LiFePO4 |
| USB-C | 2 (100W) |
| USB-A | 2 |
| Max output | 990W AC |
| TSA legal | No |
Same job, other budgets
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EcoFlow RIVER 3 Max Plus
$369Tracked 2026-09-21
Buy links are affiliate links: we earn a commission at no extra cost to you. Prices are tracked estimates, not live prices. Full disclosure
We do not lab-test hardware. Ratings and review counts come from the retailer listing and are labelled as such; stream-quality figures are conservative planning budgets from our published model. Prices are tracked at build time, not live, and were last refreshed 2026-10-22. How the numbers are derived: methodology. How picks are chosen: editorial policy.