Top-Rated Home Battery Installers in Islip, NY

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

Ratings and review counts from Google Maps, collected September 2026 · Page updated October 24, 2026

7Companies
1,589Google reviews
4.6★Average rating
Sep 2026Data collected
Ranked by Google reviewsNot 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

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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) 870-7197View profileGoogle reviews
  2. 2
    Harmony EnergyAlso installs solar
    5.0 (32 Google reviews)
    80 Orville Dr, Bohemia, NY 11716
    Call (631) 244-1679View profileGoogle reviews
  3. 3
    Leviathan SolarAlso installs solar
    4.9 (49 Google reviews)
    1993 Pond Rd, Ronkonkoma, NY 11779
    Call (631) 553-2732View profileGoogle reviewsEmail
  4. 4
    SUNation EnergyMost reviewsAlso installs solar
    4.7 (962 Google reviews)
    171 Remington Blvd, Ronkonkoma, NY 11779
    Call (631) 750-9454View profileGoogle reviewsEmail
  5. 5
    Trinity SolarAlso installs solar
    4.6 (317 Google reviews)
    2180 5th Ave #1, Ronkonkoma, NY 11779
    Call (877) 786-7283View profileGoogle reviewsEmail
  6. 6
    US Solar EnterpriseAlso installs solar
    4.1 (37 Google reviews)
    194 Morris Ave Unit 52, Holtsville, NY 11742
    Call (631) 578-3777View profileGoogle reviewsEmail
  7. 7
    Patriot Energy SolutionsAlso installs solar
    4.0 (129 Google reviews)
    1265 Sunrise Hwy, Bay Shore, NY 11706
    Call (800) 569-0309View profileGoogle reviews

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 not paid for. How we rank and how we make money.

Listed here? Get your top-rated badge for your website or print the Islip rebate sheet for your customers.

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.

Rebates open in IslipNone confirmed right now

Financing or future programs may still help. Check the rebate page before you sign.

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

Talk to a home energy auditor first. Some utility programs want an audit before any work starts. See the top-rated home energy auditors in Islip.

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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.

Questions about home battery installers in Islip

Who is the best home battery installer in Islip?

Based on Google reviews, 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). We rank by a review-weighted score, so companies with many strong reviews rank above those with only a few.

How are the home battery installers in Islip ranked?

We list 7 home battery companies in Islip, ranked by Google rating weighted by review count. Together they have 1,589 Google reviews and average 4.6 stars, collected September 2026. SUNation Energy has the most reviews (962). No company pays to be listed or ranked.

How much does a home battery installation cost in Islip?

Battery prices depend 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.

Are there rebates for home batteries in Islip?

We have no confirmed open home battery rebate for Islip right now. Financing or future programs may still help, so check the rebate page before you sign.

What should I ask a home battery installer before I hire?

Ask for the usable storage (kWh) and the continuous power (kW), and which circuits it will keep running in an outage. Ask whether the battery is on your rebate program's approved list. Brands not on the list get no rebate. Ask where it will go. Some batteries lose capacity or stop charging in a cold garage.

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, home energy auditors in Islip.

How to read these results

  1. Open the profile.How a installer describes its own work tells you a lot. Look for jobs like yours.
  2. Read the Google reviews.Stars and counts come from Google Maps. Click through and read what past customers wrote, good and bad.
  3. Check for program badges.A green registered-contractor badge means the company is on the program's own list, which some rebates require.
  4. Compare three.Do not stop at the first good installer. Three quotes show you the real range in price, equipment and plan.

Not ready to talk to a contractor yet?

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