Top-Rated Home Battery 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 home battery installers in Islip are Truth Solar (5.0★, 63 reviews), Harmony Energy (5.0★, 32 reviews), Leviathan Solar (4.9★, 49 reviews).

Home Battery installers in Islip, ranked 7 listed

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  1. 1
    Truth SolarTop pickHighest rating (50+ reviews)Also installs solar
    5.0 (63 Google reviews)
    2150 Joshuas Path Ste 16, Hauppauge, NY 11788
    Call (631) 870-7197WebsiteGoogle reviewsProfileDirections
  2. 2
    Harmony EnergyTop pickAlso installs solar
    5.0 (32 Google reviews)
    80 Orville Dr, Bohemia, NY 11716
    Call (631) 244-1679Google reviewsProfileDirections
  3. 3
    Leviathan SolarTop pickAlso installs solar
    4.9 (49 Google reviews)
    1993 Pond Rd, Ronkonkoma, NY 11779
    Call (631) 553-2732WebsiteGoogle reviewsProfileDirectionsEmail [email protected]
  4. 4
    SUNation EnergyMost reviewsAlso installs solar
    4.7 (962 Google reviews)
    171 Remington Blvd, Ronkonkoma, NY 11779
    Call (631) 750-9454WebsiteGoogle reviewsProfileDirectionsEmail [email protected]
  5. 5
    Trinity SolarAlso installs solar
    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 solar
    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 solar
    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 home battery costs in Islip

Typical installed priceVaries by battery

Price depends on the brand, how much storage you want, and whether you need a panel upgrade. Ask for the price per usable kWh so quotes are easy to compare.

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).

Rebates: our verified program data, checked monthly. Always confirm the exact amount for your home.

Get free quotes from these home battery installers

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Which battery should you ask about?

Most home installers work with a few brands. Compare usable storage (kWh), how much power it can deliver at once (kW), whether it works in an unheated garage, and the warranty. Our side-by-side guides cover the Tesla Powerwall 3, Enphase IQ Battery 5P, Eguana Evolve and FranklinWH aPower 2. Compare home batteries.

Before you hire a home battery installer

  1. Ask for the usable storage (kWh) and the continuous power (kW), and which circuits it will keep running in an outage.
  2. Ask whether the battery is on your rebate program's approved list. Brands not on the list get no rebate.
  3. Ask where it will go. Some batteries lose capacity or stop charging in a cold garage.
  4. Ask about the warranty: years, and how much capacity it keeps by the end.

Before you call anyone, check what home battery 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, solar installers, insulation installers in Islip.

See every rebate in Islip

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