Potential Downsides of Using Generators With Solar Systems?

Noise and Environmental Impact

Generators are significant sources of noise pollution, often exceeding 90 decibels, which can negatively impact the quality of life for nearby residents. Furthermore, fossil-fuel generators release greenhouse gases and other pollutants, contributing to climate change and air pollution. For example, a typical 5 kW propane generator produces approximately 3,000 pounds of CO2 per year, the equivalent of driving a car over 7,000 miles.

Maintenance and Operating Costs

Generators require regular maintenance to ensure optimal performance, including oil changes, spark plug replacements, and air filter cleaning. The costs associated with maintenance can be substantial, with some estimates suggesting up to 10% of the initial purchase price per year. Additionally, generators can be costly to operate, especially if used for extended periods. For instance, a 5 kW propane generator can cost over $1,000 per year to operate, depending on the fuel costs and usage.

System Efficiency and Power Demand

Generators can disrupt the overall efficiency of the solar system, especially if not sized correctly. If the generator is too small, it may not be able to meet peak demand, leading to reduced system performance and potentially causing damage to the solar array and inverter. On the other hand, if the generator is too large, it can become a standby power source, negating the benefits of the solar system. For example, a 5 kW solar array paired with a 5 kW generator may not be sufficient for a household with high power demand, potentially leading to reduced system efficiency and reduced battery life.