Quick Answer
A grid-tied system is better for homes that have a stable energy demand and access to net metering, as it can reduce energy bills and provide a backup power source, but an off-grid system is more suitable for remote or off-grid locations with high energy demands.
Grid-Tied System Advantages
A grid-tied system can provide a lower upfront cost compared to an off-grid system, with prices ranging from $2 to $5 per watt installed, depending on the location and system size. Additionally, grid-tied systems can take advantage of net metering, which allows homeowners to sell excess energy back to the grid and offset their energy bills. For example, if a homeowner has a 5 kW solar array and produces 4 kW of excess energy during the day, they can sell it back to the grid and receive a credit of around $400 per year, assuming an average energy price of $0.10 per kWh.
Off-Grid System Considerations
However, off-grid systems are more suitable for remote or off-grid locations with high energy demands, such as homes with electric vehicle (EV) charging needs. A typical off-grid system can cost between $5 to $10 per watt installed, depending on the system size and battery bank. To calculate the energy storage needs for a home with EV charging, you can use the following formula: total daily energy demand (kWh) + EV charging energy demand (kWh) / system efficiency = total battery bank capacity (kWh). For example, a home with a daily energy demand of 20 kWh and an EV charging energy demand of 10 kWh, with a system efficiency of 80%, would require a battery bank capacity of 25 kWh to cover the total energy demand.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.