How Many Panels Do I Need? RVs and Marine Hot Water Heaters

Find your location on the map below. Use the table to approximate the amount of panels you will need for optimal efficiency. 
If your panels are more than 25 ft from your water heater(50 ft total run), we recommend adding an extra panel. Extra panels can always be added after your installation is complete. 
 Number of Gallons in Hot Water Tank

Southern United States- Warmer Climates

Mid United States


Northern United States- Colder Climates

6 gallons 1 panel 1-2 Panels  2 Panels
10 gallons 2 Panels 2-3 Panels  3 Panels
10+ gallons 3 Panels 3-4 Panels 4 Panels