Can Off-Grid Solar Systems Support Electric Heating Systems?

Sizing the Solar System for Electric Heating

To support an electric heating system, you need to calculate the system’s energy requirements and ensure your off-grid solar system can meet those demands. Start by determining the total wattage of the heating system. For example, a 2 kW electric space heater requires 2000 watts of electricity. Next, calculate the system’s energy requirements over a 24-hour period to determine the daily energy demand. For instance, if the space heater runs for 8 hours a day, the daily energy demand would be 2000 watts x 8 hours = 16,000 watt-hours (Wh) or 16 kWh.

Calculating the System’s Capacity

To determine the required solar panel and battery capacity, calculate the system’s peak sun hours (PSH) for your location. For example, a system in a region with 6 hours of peak sun hours per day would need a larger solar panel array to generate enough energy. Use a solar panel load calculator or worksheet to determine the required solar panel capacity based on the system’s energy demand and the PSH. For example, if the system requires 16 kWh of energy per day and the PSH is 6 hours, you might need a 3200 watt solar panel array.

System Design Considerations

When designing an off-grid solar system to support an electric heating system, consider the battery bank’s capacity and the inverter’s output. The battery bank should be sized to provide enough energy storage to meet the system’s energy demands during periods of low solar input. For example, if the system requires 16 kWh of energy per day, you might need a 20 kWh battery bank to ensure energy storage during periods of low solar input. The inverter should be sized to handle the system’s peak energy demands, which in this case would be 2000 watts.