The watt-hour number on the box never tells the whole story. This tool takes your battery
size, the gear you actually plan to run, and real-world inverter losses, then tells you how
many hours you will get. No formulas needed.
Step 1: How big is the battery?
Pick a common size or type the exact watt-hours from the spec sheet.
From the spec sheet. Lets us check the station can actually POWER your loads, not just store enough energy for them.
Step 2: What are you running?
Tap everything that will be on at the same time. Numbers are realistic average draws, not nameplate maximums.
FIELD STATION · RUNTIME PASS
Your run time
Battery size
Run time with your loads
Good for
Math: usable capacity is 85% of rated Wh, and AC loads lose about 10% more through the
inverter. DC loads like a 12V fridge skip the inverter, so no loss is applied to them.
Fridges and freezers cycle on and off, so we use averaged draw. Cold weather
can cut lithium run time another 10 to 20 percent.
Stations with enough capacity
These searches match the capacity that gives you a full day with your selection. Before buying, also confirm the station's continuous and surge output ratings cover your combined draw, because capacity only decides how long, not whether, it can run your gear.
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