About WattSizer

WattSizer answers one question carefully: what size battery power station (solar generator) do you actually need? Not with folklore — with numbers you can check.

Why we exist

Sizing advice on the internet is broken. The most widely copied appliance-wattage table on the web is decades old, and when we machine-checked its values against manufacturer specs and government datasets we found it wrong in both directions: power tools understated by 40–60% (your station trips offline mid-cut) and modern LED lighting overstated by 50–150% (you buy twice the battery you need). Meanwhile the number that actually decides whether a station works — startup surge — is missing from most tables entirely.

So we built the data layer first: 130 appliance rows, each carrying running watts, startup surge, duty-cycle hours, the source URL it came from, and a verification flag — currently backed by 61 distinct sources and 25 tracked power stations across six brands, every product spec taken from the manufacturer's own documentation.

How we're funded

When you buy a station through links on this site, the retailer pays us an affiliate commission. Brands do not pay for placement, and ranking is computed from your load, not from who pays us. If our database has no station that fits your load, we show you that instead of pretending — see the methodology for exactly how recommendations are matched.

What we are not

Not a fuel-generator site: our runtime math is battery-based (watt-hours), though the watts math applies to anything. Not a brand's support desk: for warranty and setup questions, contact the manufacturer. And not infallible — if you find a number that's wrong, tell us with a source and we'll fix it. That loop is how the library got good.