How Long Will the EcoFlow River 2 Run an Aquarium Heater (100W)?
Updated 2026-10-17 · Yes
The numbers
| Battery capacity | 256Wh (LFP) |
|---|---|
| Usable energy | 218Wh (85% via AC outlets) |
| Continuous AC output | 300W |
| Surge rating | 600W |
| Aquarium heater (100W) running watts | 100W |
| Startup watts | 100W |
| Average draw | 40W |
| Estimated runtime | 5.4 hours |
| Energy per day of typical use | 960Wh |
256Wh × 0.85 = 218Wh usable ÷ 40W average = 5.4 hours
Station specs: source, checked 2026-10-17. See how we calculate runtime.
Adjust the numbers
Check the label on your aquarium heater (100W) and enter its real wattage.
Recharging with solar
The EcoFlow River 2 accepts up to 110W of solar input. In real conditions that harvests about 413Wh on a sunny day (5 peak-sun hours).
Solar can’t fully keep up. An aquarium heater (100W) uses about 960Wh a day at 24 hours of use, more than the EcoFlow River 2’s best-case solar harvest. Solar will stretch the runtime but not sustain it.
Tips
- Aquarium heaters cycle with their thermostat. Add an air pump (5–10W) to keep fish oxygenated during an outage.
- You’ll still have about 200W of AC capacity left for other devices at the same time, though they’ll share the same battery.
- The EcoFlow River 2 uses LiFePO4 (LFP) cells, rated for thousands of cycles, so running it down daily won’t wear it out quickly.
Other power stations running an aquarium heater (100W)
| Power station | Capacity | Output | Runtime | Verdict |
|---|---|---|---|---|
| EcoFlow River 3 | 245Wh | 300W | 5.2 hours | Yes |
| Jackery Explorer 240 v2 | 256Wh | 300W | 5.4 hours | Yes |
| Bluetti EB3A | 268Wh | 600W | 5.7 hours | Yes |
| Jackery Explorer 300 Plus | 288Wh | 300W | 6.1 hours | Yes |
| Anker SOLIX C300 | 288Wh | 300W | 6.1 hours | Yes |
| Goal Zero Yeti 500X | 505Wh | 300W | 11 hours | Yes |
| EcoFlow River 2 Max | 512Wh | 500W | 11 hours | Yes |
| Anker 535 PowerHouse | 512Wh | 500W | 11 hours | Yes |
FAQ
Will the EcoFlow River 2 run an aquarium heater (100W) overnight?
No. At about 40W average it runs out after 5.4 hours. For a full night you need at least 400Wh of capacity.
How long does the EcoFlow River 2 take to recharge with solar?
With its maximum 110W of solar input it refills in about 3.1 hours of strong sun. A single 200W panel is enough to max out its solar input.