SizeWatt: Solar Sizing That Shows Its Work

Field notes

SizeWatt separates off-grid system sizing, RV and van solar, and voltage selection into distinct tools. The homepage says the system sizes to winter sun and exposes factors such as battery round-trip loss rather than hiding them inside a final number. Its RV workflow uses appliance-by-appliance duty cycles and checks whether the proposed array fits the roof, while the voltage comparison connects 12 V, 24 V, and 48 V choices to the cable gauge required at a given array and inverter size.