Pair your load with the right power.

Which calculator answers your question?

All four run on the same library of records the rest of the site is written from, so a figure one of them returns is the figure another one starts from. None of them estimates around a gap: where a manufacturer has not published something, the tool says which input is missing instead of substituting a plausible one.

Every answer is computed in your browser from data already in the page. Nothing you tick is sent anywhere.

Not sure? Start with the sizing quiz →
What size power station do I need? Four questions — what you are powering it for, which loads, for how long, and what you are willing to spend — and it returns sized picks with the arithmetic shown. Start here if you do not yet have a machine in mind. Answer four questions →
How long will a power station run my appliances? Pick a machine and tick the loads. Runtime comes from usable capacity, duty cycle, inverter efficiency and the station’s own idle draw — never from dividing the nameplate, which overstates it by a fifth or more. Work out the hours →
How long does it take to charge a power station with solar panels? Pick a station, a panel and how many. It checks the array against cold-corrected open-circuit voltage, the MPPT window, the input current limit and the connector before it gives you a time — because an illegal array has no charge time. Check an array →
How many solar panels do I need to power my house? Tick what you want to keep running and say how long each one runs. It returns the daily energy, the array in kW and the storage in kWh, and names the products verified to take the job. No installer matching and no cost figures. Size an array →

Something we should measure?

Every one of these runs on published manufacturer figures, and where a manufacturer publishes nothing the tool says so instead of estimating. If you have run one of these machines against a real load, submit a log — three consistent submissions for one combination is what turns a gap into a user-verified figure.

Elsewhere on the site