Top-Rated Solar Installers in Islip, NY

7 local companies ranked by 1,589 Google reviews. Free to compare, no sign-up.

Ratings collected September 2026 · Page updated September 30, 2026

7Companies
1,589Google reviews
4.6★Average rating
Sep 2026Data collected
Ranked by Google reviewsNever paid forFree to compare

Short answer: The top-rated solar installers in Islip are Truth Solar (5.0★, 63 reviews), Harmony Energy (5.0★, 32 reviews), Leviathan Solar (4.9★, 49 reviews).

Solar installers in Islip, ranked 7 listed

Sort by
  1. 1
    Truth SolarTop pickHighest rating (50+ reviews)Also installs batteries
    5.0 (63 Google reviews)
    2150 Joshuas Path Ste 16, Hauppauge, NY 11788
    Call (631) 870-7197WebsiteGoogle reviewsProfileDirections
  2. 2
    Harmony EnergyTop pickAlso installs batteries
    5.0 (32 Google reviews)
    80 Orville Dr, Bohemia, NY 11716
    Call (631) 244-1679Google reviewsProfileDirections
  3. 3
    Leviathan SolarTop pickAlso installs batteries
    4.9 (49 Google reviews)
    1993 Pond Rd, Ronkonkoma, NY 11779
    Call (631) 553-2732WebsiteGoogle reviewsProfileDirectionsEmail [email protected]
  4. 4
    SUNation EnergyMost reviewsAlso installs batteries
    4.7 (962 Google reviews)
    171 Remington Blvd, Ronkonkoma, NY 11779
    Call (631) 750-9454WebsiteGoogle reviewsProfileDirectionsEmail [email protected]
  5. 5
    Trinity SolarAlso installs batteries
    4.6 (317 Google reviews)
    2180 5th Ave #1, Ronkonkoma, NY 11779
    Call (877) 786-7283WebsiteGoogle reviewsProfileDirectionsEmail [email protected]
  6. 6
    US Solar EnterpriseAlso installs batteries
    4.1 (37 Google reviews)
    194 Morris Ave Unit 52, Holtsville, NY 11742
    Call (631) 578-3777WebsiteGoogle reviewsDirectionsEmail [email protected]
  7. 7
    Patriot Energy SolutionsAlso installs batteries
    4.0 (129 Google reviews)
    1265 Sunrise Hwy, Bay Shore, NY 11706
    Call (800) 569-0309WebsiteGoogle reviewsDirections

Together these 7 companies average 4.6★ across 1,589 reviews. SUNation Energy has the most reviews (962).

Ranked by Google rating weighted by review count, collected September 2026. Rankings are never paid for. How we rank and how we make money.

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What a solar costs in Islip

Typical installed priceabout $22,400 to $38,500

For a 7 kW home system ($3.20 to $5.50 per watt, the middle 60% of US home systems in 2023). Your home may cost more or less.

Battery rebates open in Islipup to $6,250

That could cut your cost by up to $6,250 if you qualify. Most rebates have rules (income, your current heating, a registered contractor, approval before work starts).

Price source: Lawrence Berkeley National Lab, Tracking the Sun. Rebates: our verified program data, checked monthly. Always confirm the exact amount for your home.

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How much sun does Islip get?

Islip averages about 4.2 peak sun hours a day, more than 73% of the 123 cities we track. As a rough guide, each kilowatt of panels here makes about 1,210 kWh a year (after typical system losses). A good installer will give you a roof-specific estimate that accounts for shading and roof angle.

Source: Open-Meteo historical solar radiation, 2020-2024. Production estimate assumes 80% system efficiency.

Before you hire a solar installer

  1. Ask for a production estimate for your roof (kWh per year) and how shading was measured.
  2. Ask which panels and inverter they use, and who backs the warranty if the company closes.
  3. Ask how your utility credits extra power you send to the grid, and whether a battery makes sense for you.

Before you call anyone, check what solar rebates you can get in Islip. Many programs require approval or a registered contractor before work starts.

Planning more upgrades? See the top-rated heat pump installers, insulation installers, home battery installers in Islip.

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