One of the quiet advantages of a battery-based power station over a fuel generator is just how little it costs to keep charged — but "basically nothing" is worth putting an actual number on.
The math
Cost to charge = capacity (kWh) × your electricity rate ($/kWh) ÷ charging efficiency (roughly 85-90%, accounting for conversion losses). At the U.S. average residential rate (roughly $0.16-0.17/kWh as of this writing), here's what a full charge costs across common capacities:
| Power station capacity | Approx. cost per full charge |
|---|---|
| 500 Wh | ~$0.10 |
| 1,000 Wh | ~$0.20 |
| 2,000 Wh | ~$0.40 |
| 3,000 Wh | ~$0.60 |
Even charging a large power station daily for a month costs a few dollars — genuinely negligible compared to almost any other household expense, and the reason power stations show up so favorably in our 5-year cost comparison against generators.
Why solar charging doesn't meaningfully change this math
Since grid charging is already this cheap, solar's value isn't really about saving money on electricity — it's about charging when there's no grid power to plug into at all. See our solar generator cost breakdown for when solar's added upfront cost is actually worth it.
The real cost driver is the unit itself, not charging it
Given how cheap ongoing charging is, the purchase price of the power station is essentially the entire cost of ownership — there's no meaningful "fuel budget" to plan around the way there is with a generator. See our power station ROI breakdown for the full ownership-cost picture.