Understanding levelized cost of energy
What maintenance adds to the picture
For a $22,000 system with $150 a year in maintenance over 25 years, LCOE comes to about $0.115 per kWh, compared to $0.099 per kWh without maintenance included, as shown on the cost per kWh produced calculator. That's a meaningful difference, roughly 17% higher, even though it's still well below a typical utility rate. The US Energy Information Administration's solar explainer covers how solar generation works and where it fits in the wider grid.
What counts as typical maintenance
Most residential systems run $100 to $300 a year for periodic inspection, cleaning, and minor repairs, though many systems need little to no maintenance in a given year. This is separate from major one-time costs like inverter replacement, which the inverter replacement cost tool handles instead. For the official overview, the US Department of Energy's homeowner's guide to going solar covers buying, leasing, and system sizing.
Why this tool doesn't include inverter replacement
Inverter replacement is typically a one-time expense around year 10 to 15, not an annual cost, so folding it into a per-year maintenance figure would distort the timing. See the inverter replacement cost calculator for a version that accounts for that specific expense properly. To size the array behind this number, the system size by annual kwh usage turns your usage into a kilowatt target.
Using zero maintenance as a baseline
Setting maintenance to zero reduces this tool to the same math as the simpler cost per kWh calculator, useful as a best-case reference point before layering in realistic ongoing costs. This estimate assumes normal upkeep, and the maintenance cost vs savings net calculator breaks down what that upkeep costs year by year.