The main cost differences between microinverters and string inverters are as follows:
Upfront Costs
- Microinverters: They typically have a higher upfront cost. For example, a microinverter can cost around $1.15 per watt, compared to $0.75 per watt for string inverters. This results in microinverters generally being more expensive for smaller systems, but they can become competitively priced for larger systems due to economies of scale.
- String Inverters: They are generally cheaper upfront, with costs ranging about $0.75 per watt. A 5kW string inverter system might cost around $5,000, whereas a microinverter system of the same size could cost significantly more.
Long-term Costs and Savings
- Microinverters: Despite the higher initial cost, microinverters offer better efficiency and can reduce long-term costs by generating more power, leading to greater savings on electricity bills over time. They also typically come with longer warranties (up to 25 years), which can reduce maintenance costs.
- String Inverters: While they are cheaper initially, string inverters can lead to higher long-term expenses due to potential inefficiencies and maintenance needs. Their centralized design means that if one panel underperforms, the entire string’s output is reduced.
Installation Complexity
- Microinverters: They are more complex to install, requiring individual installation for each panel, which increases the installation time and cost.
- String Inverters: They are simpler and quicker to install, requiring less time on the roof, as they are typically installed at ground level.
In summary, while microinverters are more expensive upfront, they can provide long-term savings and better overall efficiency. In contrast, string inverters are cheaper to install initially but may incur higher long-term expenses.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/what-are-the-main-cost-differences-between-microinverters-and-string-inverters/
