Understanding inverter replacement cost
What inverter replacement typically costs
Most residential string inverter replacements run about $1,200 to $2,500 including labor, and this usually happens once between year 10 and year 15 of a system's life. Microinverters and power optimizers, by contrast, are typically warrantied for 20 to 25 years and rarely need full replacement. The US Department of Energy's homeowner's guide to going solar walks through the same decision step by step.
How much this changes your bottom line
On a system with $61,365 in gross 25 year savings, an $1,800 inverter replacement is about 3% of total savings, a modest one-time dent rather than a major factor in the overall payback. See the payback period calculator to see how it shifts your break-even timeline. For background on how solar power is generated, the solar explainer from the US Energy Information Administration is a solid starting point.
String inverters versus microinverters
A single string inverter is the more common, lower-upfront-cost choice, but it carries this one-time replacement cost partway through the system's life. Microinverters or power optimizers cost more upfront but are typically warrantied to match the panels, avoiding this expense. Ask your installer to compare both options for your specific system. If you have not sized the system yet, start with the solar panel calculator and bring its kilowatt figure back here.
What this doesn't include
This tool only nets out inverter replacement. Pair it with the maintenance cost calculator or the total cost of ownership calculator for a fuller net figure that includes routine upkeep and system cost. This estimate assumes normal upkeep, and the maintenance cost vs savings net calculator breaks down what that upkeep costs year by year.