Off-grid and RV solar
Size your solar for the month that matters, not the average
Our guides use measured output from the European Commission's PVGIS model for 38 US and European locations, and simulate 2 common off-grid setups through years of weather. You see the data and the math behind every recommendation.
Browse all guidesarrow_forwardWhat Size Off-Grid Solar System Do I Need? A Sizing Guide Built on Real Sun Data
The same 1 kW array makes 4.0 kWh a day in a Phoenix December and 1.1 kWh in Seattle. Size for your worst month, not a national average.
Latest guides
How Much Solar Do I Need for My RV? Winter and Summer Numbers by Location
RV panels lie flat, so winter hits them harder than home systems. Here is the array size a 1,200 Wh boondocking day needs, by location and month.
How Many Batteries Do I Need for Off-Grid Solar? Battery Bank Sizing With Real Winter Data
Battery count comes from three numbers: daily watt-hours, days of autonomy and usable depth of discharge. Here is the math, plus why a bigger bank cannot fix a winter shortfall.
Solar Panels in Winter: How Much Output Drops by Location in the US, UK and Europe
Solar panels keep working in winter, but how much they make depends heavily on latitude and clouds. December output ranges from about 8% of June in Stockholm to 98% in Miami.