Free calculators
They use the same engine as the Solispec designer. No account; everything runs in your browser.
- 01
Snow and wind by address
The DBN snow and wind region, with altitude and terrain taken into account.
Open the calculator - 02
Ballast for a flat roof
How many kilograms of ballast keep a row of panels in place in the wind — uplift and sliding.
Open the calculator - 03
Attachment spacing on a pitched roof
How many rafters apart the hooks or brackets go for your region's snow and wind.
Open the calculator - 04
Strings and inverter
How many panels can go in series on an inverter MPPT input, frost included.
Open the calculator - 05
Payback of a plant
Yearly generation, savings and how many years it takes to pay back.
Open the calculator - 06
How long the battery lasts
How many hours the batteries keep your loads running during an outage.
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The calculation is preliminary. A qualified engineer must check it before installation.