Enphase IQ Battery vs. FranklinWH aPower vs. Tesla Powerwall: A Connecticut Comparison

Enphase IQ Battery 10T, FranklinWH aPower, and Tesla Powerwall 3 are the three home batteries West Electric installs most often in Connecticut. Each takes a different technical approach to backup power and solar integration. Here is the honest comparison with real Connecticut pricing.

At a Glance

CT installed cost includes hardware, installation labor, permit, and inspection. Before the CT ESS incentive. Last updated May 2026.

Enphase IQ Battery 10T: Best for Enphase Solar Owners, Lowest Power Output

The Enphase IQ Battery 10T is an AC-coupled battery, which means it connects to your home's AC wiring rather than directly to your solar panels' DC output. This architecture makes it the easiest battery to add to any existing solar installation - if you already have solar with any inverter brand, adding an Enphase battery does not require replacing your inverter.

For Enphase IQ inverter owners specifically, the IQ Battery integrates natively into the Enphase monitoring platform with a single app for solar, battery, and home energy management.

The key limitation is continuous output: 3.84 kW continuous per unit (5.7 kW peak). For whole-home backup in a larger Connecticut home with an HVAC system, one unit may not be enough to cycle the compressor. Two IQ 10T units ($24,000-$32,000 installed) address this but become competitive with a single FranklinWH or Powerwall at higher capacity.

Best for: Existing Enphase solar owners, partial-home backup (lights, refrigerator, devices), modular expansion plans, or homes where the solar inverter is newer and DC-coupling is impractical.

FranklinWH aPower: Highest Continuous Output for Whole-Home Backup

FranklinWH aPower's standout spec is continuous output: 10 kW, the highest of the three batteries in this comparison. For Connecticut homeowners with oil-to-heat-pump conversions, central A/C, or other high-draw loads, 10 kW continuous is the spec that determines whether your backup can actually run your whole house or just your essential loads.

FranklinWH uses a hybrid inverter architecture - the battery and inverter are integrated, which typically means slightly higher system efficiency than AC-coupling. It supports both DC-coupled (new solar installation) and AC-coupled (add-on to existing solar) configurations.

The aPower is the newest of the three batteries in this comparison. FranklinWH is a U.S.-based company that offers a 12-year warranty, shorter than Enphase's 15-year warranty but comparable to Powerwall's 10-year warranty.

Best for: Whole-home backup with high-draw loads, oil-to-electric conversions, larger Connecticut homes where a single battery's 10 kW output can run central HVAC and the EV charger simultaneously.

Tesla Powerwall 3: Best Efficiency, Best Tesla Integration

Powerwall 3 is the newest generation in the Powerwall line. The standout spec is round-trip efficiency: approximately 97.5% - significantly higher than the 89% round-trip efficiency of Enphase and FranklinWH. In practical terms, for every 100 kWh your solar puts into the battery, you get 97.5 kWh back out instead of 89 kWh. Over 10 years, that difference is meaningful.

Powerwall 3 also integrates most cleanly with Tesla solar and with the Tesla app ecosystem. For homeowners who already drive a Tesla, the single-app experience (car, home solar, battery, EV charger) is a real convenience advantage.

Powerwall 3 requires a Tesla-certified installer. West Electric is Tesla Powerwall certified. The 10-year warranty is the shortest of the three options, though Tesla's warranty service track record is strong.

Best for: Tesla vehicle owners, homeowners who prioritize efficiency over raw output, new solar + battery installations where DC coupling can be optimized.

The CT Energy Storage Solutions Incentive Applies to All Three

Connecticut's Energy Storage Solutions (ESS) program pays an incentive for qualifying residential battery storage regardless of brand. As of 2026, the incentive is approximately $200-$400 per kWh of installed usable capacity, paid over time based on battery discharge. Confirm current rates and program caps at ctgreenbank.com.

Which Battery Do Most Connecticut Homeowners Choose?

At West Electric, Enphase IQ Battery is the most common add-on for existing Enphase solar owners. Powerwall 3 is the most common choice for new solar + battery installations, particularly among Tesla vehicle owners. FranklinWH aPower is the fastest-growing option for customers prioritizing whole-home backup with high continuous output.

For most Connecticut homeowners, the right battery depends more on your existing solar inverter and your household's largest backup loads than on any single spec. West Electric designs each system to match your actual usage, not the battery with the best marketing.