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NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
Get a Free QuoteWhich is better for your home? We install both. Here's our honest, spec-by-spec comparison based on real installation experience.
The Enphase IQ Battery 10C wins this head-to-head comparison, taking 3 out of 5 categories. It's the stronger choice for most homeowners, especially those who prioritize best overall battery for enphase solar systems. That said, the Tesla Powerwall 3 is still a solid product and may be the better pick if you specifically need whole-home backup with a single unit.
Tesla · Powerwall 3
Enphase · IQ Battery 10C
| Spec | Tesla | Enphase |
|---|---|---|
| Usable Capacity | 13.5 kWh | 10 kWh |
| Continuous Power | 11.5 kW | 7.08 kW |
| Peak Power | 11.5 kW sustained | 14.16 kW (10 sec) |
| Round-trip Efficiency | 89% | 96% DC / 90% AC |
| Chemistry | LFP (Lithium Iron Phosphate) | LFP (Lithium Iron Phosphate) |
| Weight | 287 lbs (130 kg) | 310 lbs (141 kg) |
| Dimensions | 43.25 x 24.0 x 7.6 in | 32.0 x 42.0 x 12.6 in |
| Operating Temp | -20°C to 50°C | -15°C to 55°C |
| Connectivity | Tesla Gateway + Wi-Fi/Cellular | Enphase Envoy + Wi-Fi |
We evaluate each product across the metrics that matter most to homeowners.
Enphase IQ Battery 10C offers a longer 15-year warranty vs 10 years.
Enphase IQ Battery 10C is more affordable at $13,000 installed vs $15,400 installed.
Our crew rates the Enphase IQ Battery 10C higher at 9.5/10 vs 9/10.
Tesla Powerwall 3 offers more storage at 13.5 kWh vs 10 kWh.
Tesla Powerwall 3 delivers more power at 11.5 kW vs 7.08 kW.
Powerwall 3 has a built-in solar inverter, so it replaces both the battery and inverter in a new solar+storage system — saves $2,000-3,000 vs separate components. Our Tesla-certified crew installs in 4-6 hours. The 11.5 kW continuous output means a single unit can back up the whole house including AC. Expansion packs ($5,900 each) add capacity without another inverter.
The IQ 10C is Enphase's Gen4 flagship battery. It's heavier than the 5P (310 lbs vs 185 lbs), so we bring a two-person crew. The install is similar to the 5P — wall-mount, connect to IQ System Controller, configure via Enphase app. The 7 kW continuous power is enough to back up essential loads plus a mini-split AC. For whole-home backup, we recommend two 10C units.
The Enphase IQ Battery 10C wins this head-to-head comparison, taking 3 out of 5 categories. It's the stronger choice for most homeowners, especially those who prioritize best overall battery for enphase solar systems. That said, the Tesla Powerwall 3 is still a solid product and may be the better pick if you specifically need whole-home backup with a single unit.
Our energy advisors can help you decide between the Tesla Powerwall 3 and Enphase IQ Battery 10C based on your specific home, budget, and energy goals.
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