Yes, sometimes—but the sump pump startup surge is usually the deciding factor. Adding the running watts is not enough. A power station must survive the largest motor start while supporting the other loads already running.
The sizing problem
For two loads, calculate simultaneous running watts, then add the largest startup increment. Battery capacity is a separate question: watt-hours determine how long the system can keep both loads operating.
Do not rely on generic watt estimates when the pump nameplate or manual is available. Pump horsepower, voltage and installation change the requirement.
Calculate your refrigerator + sump pump
Our calculator includes refrigerator and common sump-pump screening values and lets you override them with actual running and startup watts.
What class of system should you expect?
Small 1kWh stations may have enough energy for a refrigerator but fail a pump startup test. A 2kWh-class unit with stronger surge capability can be a better starting point, while long outages may require expansion batteries or solar recharge.
See our sump pump backup comparison, refrigerator backup guide, and 2kWh power-station guide.
Current expandable option
BLUETTI AC200L provides 2,048Wh base capacity, 2,400W continuous AC output and a manufacturer-listed 7,200W surge rating.
Affiliate link. Verify your pump’s voltage and startup requirement before purchase.