iSolar Hot Water Academy's
International Support - Metric & Imperial
I'll help you design a solar electric water heater.
This takes about 2 minutes.
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Modeling estimates solar hot water using local solar radiation and groundwater temperature. It targets 75–85% of annual hot-water demand from solar for balance of cost and performance.
You can select annual or seasonal averages, or enter your own custom values.
The goal is to provide a practical starting point for system sizing rather than detailed hour-by-hour or day-by-day performance modeling.