Solar Panels in Mandeville, LA: Cost, Payback & Savings
A typical 10.4 kW home solar system in Mandeville costs about $37,440 and doesn't pay for itself within 25 years, losing roughly $5,149 overall at Louisiana's average electricity price of 13.4¢/kWh. Power you send back to the grid earns only about 2.7¢/kWh here, which is built into these numbers.
Monthly solar production in Mandeville
Estimated output of a 10.4 kW south-facing roof system. May is the strongest month (1,477 kWh); Dec the weakest (895 kWh).
Solar production (kWh) Typical home use, 1,202 kWh/month
Solar payback calculator for Mandeville
Pre-filled with Mandeville's sunshine and Louisiana's average electricity price. Enter your own bill and an installer's price per watt to see your payback.
Leave export credit blank where the utility offers full net metering. Where exports earn less, solar used at home as it's produced is worth the full price and the rest earns the export credit.
How Mandeville compares
- Each kW of panels here produces about 1,395 kWh a year — 4% less than the Louisiana median and about the same as the US median city (1,371 kWh).
- Payback ranks #42 of 66 Louisiana places we cover.
- Sunshine varies little across a state; electricity price, installed cost and how utilities credit exported power drive most of the difference between states.
Net metering, tax credits and incentives in 2026
Louisiana pays less than retail for exported solar power. Under Avoided-cost net billing, power you send to the grid earns about 2.7¢/kWh, against 13.4¢ for power you buy. We assume 40% of a no-battery system's output is used at home as it's produced (worth the full price) and the rest is exported, so each solar kWh is worth about 7.0¢. Using more of your solar yourself, by running appliances midday or adding a battery, raises that.
Louisiana PSC rules since 2020 credit exports at the utility's avoided cost, about a quarter of retail. Entergy New Orleans customers may still have retail net metering. Source.
There is no federal tax credit for buying home solar installed in 2026. The 30% Residential Clean Energy Credit (Section 25D) ended for systems placed in service after December 31, 2025, so the costs and paybacks on this page include no federal credit.
Louisiana and local utilities may still offer rebates, performance payments, property-tax or sales-tax exemptions. Search the DSIRE incentives database for Louisiana and ask installers which programs they apply for you.
Frequently asked questions
Is solar worth it in Mandeville, LA?
For a typical home, savings do not repay the system within 25 years at today's prices. Over 25 years the estimated net loss is $5,149. Verdict: hard to justify on savings alone. Your own payback depends on your roof, your bill and the quotes you get.
How many solar panels do I need in Mandeville, LA?
A home using 1,202 kWh a month (the Louisiana average) needs about 26 panels of 400 W — a 10.4 kW system — to cover its annual use. Divide your own yearly kWh by 1,395 to get the kW you need.
How much do solar panels cost in Mandeville, LA?
At 3.60 dollars per watt, a 10.4 kW system costs about $37,440 before any state or utility incentives. There is no federal tax credit for systems installed in 2026.
How much sun does Mandeville get?
Mandeville averages 5.4 peak sun hours per day, so each kilowatt of panels produces about 1,395 kWh a year.
Does Louisiana have net metering?
Not full retail net metering. Under Avoided-cost net billing, exported solar power earns about 2.7¢ per kWh, versus 13.4¢ for power bought from the grid. Solar you use at home as it's produced still saves the full price.
How much does electricity cost in Louisiana?
Residential electricity in Louisiana averages 13.4¢ per kWh, and a typical home uses 1,202 kWh a month (EIA).
Solar payback in nearby places
- Covington25+ yrs
- Slidell25+ yrs
- Hammond25+ yrs
- Metairie25+ yrs
- Kenner25+ yrs
- Jefferson25+ yrs
- New Orleans25+ yrs
- River Ridge25+ yrs