Can I use a generator to supplement my solar energy?

Why Generator Sizing Matters

When adding a generator to your solar setup, it’s crucial to size it correctly to avoid overloading your electrical panel. A general rule of thumb is to size the generator to 10-20% of your total system’s capacity. For example, if you have a 2 kW solar system, a 0.2-0.4 kW generator would be a suitable supplement.

Calculating Generator Capacity

To calculate the generator’s capacity, consider the following factors: the number of appliances you want to run during a power outage, the voltage and frequency requirements, and any existing electrical loads. A good starting point is to identify the appliances that will be used during an outage and calculate their total power consumption in watts. Multiply this number by the number of hours you want the generator to run, and then divide by 1000 to get the kilowatt hour (kWh) requirement.

Example Calculation

Let’s say you want to run a 1 kW refrigerator for 4 hours during a power outage. First, calculate the total energy required in kWh by multiplying the power consumption (1 kW) by the number of hours (4 hours). This gives you 4 kWh. Then, consider the generator’s capacity and the electrical panel’s size to ensure they can handle the additional load. As a general rule, a 5 kW generator can handle a 2 kW solar system with a 4 kWh energy storage system and several small electrical loads.