BLUETTI AC50B vs EcoFlow RIVER 2 Max 500
Two small power stations, number by number. Neither is ranked above the other. Every spec comes from each maker's manual or product page; tap a station for the source.
- Bigger battery: EcoFlow RIVER 2 Max 500, 499 Wh vs 448 Wh.
- More AC output: BLUETTI AC50B, 700 W vs 500 W.
- More solar input: EcoFlow RIVER 2 Max 500, 220 W vs 200 W.
- Higher solar voltage limit: EcoFlow RIVER 2 Max 500, 50 V vs 28 V.
- Lighter: EcoFlow RIVER 2 Max 500, 13.2 lb vs 14.8 lb.
- Lower brand-store price: EcoFlow RIVER 2 Max 500, $329 vs $399.
AC50B and RIVER 2 Max 500 are the same size class: within 51 Wh of each other. RIVER 2 Max 500 is the lightest at 13.2 lb. RIVER 2 Max 500 takes the most solar at 220 W, so it refills fastest. RIVER 2 Max 500 is the cheapest at $329, and it also leads on solar input.
How long they run common devices
| Device | BLUETTI AC50B | EcoFlow RIVER 2 Max 500 |
|---|---|---|
| Fridge (60 W) | 6.5 hours | 7 hours |
| CPAP (40 W) | 9.5 hours | 11 hours |
| Starlink (100 W) | 4 hours | 4 hours |
| Laptop (60 W) | 6.5 hours | 7 hours |
On a full charge, assuming 85% of the battery is usable. Real devices vary; check the label on yours.
Every spec side by side
| Spec |  BLUETTI |  EcoFlow |
|---|---|---|
Battery Wh, size | 448 Wh fridge about 6.5 hours | 499 Wh fridge about 7 hours |
AC output W, continuous | 700 W Fridge, CPAP, laptops, lights | 500 W Fridge, CPAP, laptops, lights |
Surge W, a second or two | n/a not published by BLUETTI | 1,000 W motor start-ups |
Solar input W, max | 200 W full in about 3 hours | 220 W full in about 3 hours |
Solar voltage range V, panels must fit | 12 to 28 V 1 panel, or 2 in parallel | 11 to 50 V 1 panel, or 2 in parallel |
Solar inputs count | 1 input Solar input | 1 input Solar input |
Weight lb | 14.8 lb one hand | 13.2 lb one hand |
Wh per pound battery for the weight | 30 Wh/lb higher is denser | 38 Wh/lb higher is denser |
Price brand store | $399 0.89 $/Wh | $329 0.66 $/Wh |
Price per Wh what you pay for storage | $0.89 lower is better value | $0.66 lower is better value |
| Buy | $399 · Details Brand store, Oct 28, 2026 | $329 · Details Brand store, Oct 28, 2026 |
Which solar panels work with each
Our checker at 20°F, using each maker's voltage and current rules. Tap a verdict for the wiring and cables.
Where to buy
Out of stock at the BLUETTI store when we checked
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