Drawing · 11 × 7.9 × 8.7 in · 16.5 lb
- Capacity
- 448 Wh
- AC output
- 700 W
- Surge
- Not published
- Solar input
- 200 W
- Weight
- 16.5 lb
Maker price$399 at BLUETTI, sold out when checked Oct 11, 2026
As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure.
EcoFlow · Compact (under 600 Wh)
EcoFlow RIVER 2 Max 500
A compact unit, 499 Wh, 500 W (1,000 surge), 13.2 lb, $309 at EcoFlow, checked Oct 11, 2026 ($0.62 per Wh). By our sizing it holds a laptop and two phones, but not a day of home backup, a night of CPAP, two nights of camping, a day in an RV or a working day in a van.
From the maker's published figures and our own calculations; we have not tested it ourselves.
Estimated runtimehours24-hour dial
Rated capacity
499 Wh
499 Wh × 0.85 ÷ device watts. An estimate, not a measured test. Startup and connections need checking.
Drawing · 10.6 × 10.2 × 7.7 in · 13.2 lb
EcoFlow RIVER 2 Max 500 $309 at EcoFlow, checked Oct 11, 2026
Capacity 499Wh
AC output 500W
Surge 1,000W
Chemistry LiFePO4
Rated cycles 3,000 to 80%
Weight 13.2lb
Max solar input 220W
Price per Wh $0.62
Should you buy it?
Buy it for: a laptop and two phones (a laptop for six hours and two phone charges).
Not for: a day of home backup (too little capacity: needs 2,323 Wh and 1,351 W at startup); a night of CPAP (too little capacity: needs 599 Wh and 104 W at startup); two nights of camping (too little capacity: needs 2,066 Wh and 157 W at startup); a day in an RV (too little capacity: needs 648 Wh and 156 W at startup); a working day in a van (too little capacity: needs 1,674 Wh and 189 W at startup).
Choose it for 220 W of solar input against 100 W and a 0.8 lb lighter carry: $40 more than the Pecron E500LFP.
Choose the Pecron E500LFP instead if you want the most battery for the money: $0.47 per Wh against $0.62, $40 less, 0.8 lb heavier; you give up solar input (100 W against 220 W).
About 424 Wh reaches the AC outlets after the 0.85 loss allowance (an estimate, not a measurement). At $0.62 per watt-hour, compare its cost with the charging speed and carry weight you need. It stores 37.8 Wh per pound. We list 28 other models in its size class; the four nearest in capacity are compared below.
What it runs, and for how long
Hours = capacity × 0.85 ÷ device watts, with the draws from the device table.
| Device | Draw W | Hours | Output and surge cover it? |
|---|---|---|---|
| CPAP machine (no heated humidifier) | 45 | 9.4 | yes |
| CPAP machine (with heated humidifier) | 53 | 8 | yes |
| Refrigerator (full-size, ENERGY STAR, ~18 cu ft top freezer) (average draw, compressor cycling) | 41 | 10.3 | no |
| Laptop (MacBook Air, charging) (charger rating, continuous) | 40 | 10.6 | yes |
| Wi-Fi router | 24 | 17.7 | yes |
| Starlink Mini (router built in) | 33 | 13.1 | yes |
| TV, 50-inch LED / Crystal UHD | 89 | 4.8 | yes |
| Camp LED light set (4 chainable lights) | 6 | 67.3 | yes |
"Yes" means its continuous output covers the draw and its surge rating covers the startup figure we use, by arithmetic on ratings, not a test. Startup figures: the CPAP with its humidifier, 104 W at startup, from ResMed's peak figure; the refrigerator, 1,300 W startup allowance, from a larger 27 cu ft Whirlpool's tech sheet. Your own appliance's label or manual has its own.
Sockets and size
- AC outlets: count not published, 500 W in total, 1,000 W surge
- One USB-C port, up to 100 W from one port
- USB-A ports: count not published
- Three 12 V outlets
How many of each socket and their limits, from the maker's spec sheet; it does not say where each one sits on the unit. It weighs 13.2 lb.
At a glance
How it compares with the other 28 compact models, on the makers' figures. We don't boil it down to one score; see how we pick.
| What it can power | Covers a laptop and two phones. Output and surge cover 13 of the 17 devices in our list, on the startup figures we use |
|---|---|
| Price per Wh | $0.62 per Wh, 6th lowest of 29 compact units |
| Portability | 13.2 lb, 21st lightest of 28 compact units |
| Recharge speed | 220 W of solar input: at least 2.3 hours of full sun at that limit to refill (an ideal minimum, not clock time); 660 W from the wall |
| Chemistry and cycle life | LiFePO4, rated 3,000 cycles to 80% |
| Expandability | No expansion stated |
Full spec sheet
| Capacity | 499 Wh |
|---|---|
| Chemistry | LiFePO4 |
| Rated cycle life | 3,000 to 80% |
| Expandable | – |
| Continuous AC output | 500 W |
|---|---|
| Surge (peak) output | 1,000 W |
| AC outlets | – |
| USB-C ports / highest output | 1 / 100 W |
| USB-A ports | – |
| 12 V outputs | 3 |
| Wireless charging pad | – |
| UPS / EPS switchover | – |
| Max AC input | 660 W |
|---|---|
| Wall recharge time | – |
| Max solar input | 220 W |
| Stated solar recharge time | – |
| App control | yes |
| Weight | 13.2 lb (6 kg) |
|---|---|
| Dimensions | 10.6 x 10.2 x 7.7 in (269 x 259 x 196 mm) |
| Wh per lb | 37.8 |
| Release year | – |
| Warranty | – |
| List price | – |
|---|---|
| Store price | $309 at EcoFlow, checked Oct 11, 2026 |
| Price per Wh | $0.62 |
Before using the battery's cycle rating to judge value, read what LiFePO4 versus NMC means for lifespan and weight.
What the output figures mean for your devices: running and surge watts, and which units can stand in for a UPS.
Which maker panels its solar input takes, how to wire them and the hours of sun to refill it: the RIVER 2 Max 500 solar setup.
Alternatives at this size
Listed smallest to largest by capacity; this unit is among them.
Select up to three models to compare.
Drawing · 10.6 × 10.2 × 7.7 in · 13.2 lb
- Capacity
- 499 Wh
- AC output
- 500 W
- Surge
- 1,000 W
- Solar input
- 220 W
- Weight
- 13.2 lb
Maker price$309 at EcoFlow, checked Oct 11, 2026
Drawing · 11.3 × 7.8 × 7.8 in · 16.1 lb
- Capacity
- 499 Wh
- AC output
- 500 W
- Surge
- 1,000 W
- Solar input
- 200 W
- Weight
- 16.1 lb
Maker price$499.95 at Goal Zero, checked Oct 9, 2026
Drawing · 10.7 × 7.3 × 9.4 in · 14.3 lb
- Capacity
- 512 Wh
- AC output
- 800 W
- Surge
- Not published
- Solar input
- 200 W
- Weight
- 14.3 lb
Maker price$279 $329 at Aferiy, checked Oct 11, 2026
Drawing · 12 × 8.1 × 7 in · 16.1 lb
- Capacity
- 512 Wh
- AC output
- 1,000 W
- Surge
- Not published
- Solar input
- 300 W
- Weight
- 16.1 lb
Maker price$299 $499 at DJI, checked Oct 9, 2026
No models match these filters.
| Model | Wh | Output W (surge) | lb | Solar input W | Chemistry | Cycles | Price at maker $ | Price per Wh | Store |
|---|---|---|---|---|---|---|---|---|---|
| BLUETTI AC50B | 448 | 700 W | 16.5 | 200 | LiFePO4 | 3,000 to 80% | $399sold out when checked Oct 11, 2026 | $0.89 | See it at BLUETTI Check price on AmazonAmazon's price may differ |
| EcoFlow RIVER 2 Max 500 | 499 | 500 W (1,000 surge) | 13.2 | 220 | LiFePO4 | 3,000 to 80% | $309checked Oct 11, 2026 | $0.62 | See it at EcoFlow Check price on AmazonAmazon's price may differ |
| Goal Zero Yeti 500 | 499 | 500 W (1,000 surge) | 16.1 | 200 | LiFePO4 | 4,000 to 80% | $499.95checked Oct 9, 2026 | $1.00 | See it at Goal Zero |
| Aferiy P010 | 512 | 800 W | 14.3 | 200 | LiFePO4 | 3,500 to 85% | $279 | $0.54 | Check price on AmazonAmazon's price may differ See it at Aferiy |
| DJI Power 500 | 512 | 1,000 W | 16.1 | 300 | LiFePO4 | 4,000 to 70% | $299 | $0.58 | See it at DJI Check price on AmazonAmazon's price may differ |
See it at EcoFlow Check price on AmazonAmazon's price may differ Every EcoFlow model we cover Does it hold enough for your devices?
Amazon offers a free 30-day Prime trial, with free delivery on eligible items. Try Prime free (a paid link, like the Amazon buttons).
Before connecting panels, compare your array's cold-morning open-circuit voltage and short-circuit current with this model's solar-input limits in its manual.
Sources
- Specs: EcoFlow product page
- Price: EcoFlow product page, checked Oct 11, 2026
- How the figures and picks are made