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We serve MA, NH, CT, RI, ME, VT, NJ, PA, and TX
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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 Tesla Powerwall 3 wins this head-to-head comparison, taking 4 out of 5 categories. It's the stronger choice for most homeowners, especially those who prioritize whole-home backup with a single unit. That said, the sonnen sonnenCore+ 10 is still a solid product and may be the better pick if you specifically need time-of-use rate optimization (buy low, sell high).
Tesla · Powerwall 3
sonnen · sonnenCore+ 10
| Spec | Tesla | sonnen |
|---|---|---|
| Usable Capacity | 13.5 kWh | 10 kWh |
| Continuous Power | 11.5 kW | 4.8 kW |
| Peak Power | 11.5 kW sustained | 8.5 kW |
| Round-trip Efficiency | 89% | 91% |
| Chemistry | LFP (Lithium Iron Phosphate) | LFP (Lithium Iron Phosphate) |
| Weight | 287 lbs (130 kg) | 198 lbs (90 kg) |
| Dimensions | 43.25 x 24.0 x 7.6 in | 56.0 x 24.0 x 10.0 in |
| Operating Temp | -20°C to 50°C | -5°C to 45°C |
| Connectivity | Tesla Gateway + Wi-Fi/Cellular | Wi-Fi / Ethernet |
We evaluate each product across the metrics that matter most to homeowners.
Both offer 10-year warranties.
Tesla Powerwall 3 is more affordable at $15,400 installed vs $16,000 installed.
Our crew rates the Tesla Powerwall 3 higher at 9/10 vs 7.5/10.
Tesla Powerwall 3 offers more storage at 13.5 kWh vs 10 kWh.
Tesla Powerwall 3 delivers more power at 11.5 kW vs 4.8 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 sonnenCore+ is an all-in-one system — battery, inverter, and energy management in one box. Installs in 3-4 hours with a single crew. It's the lightest battery in our lineup at 198 lbs, making wall mounting straightforward. The TOU optimization mode is excellent for customers on time-of-use rates who want to minimize grid purchases during peak hours. We install these less frequently than Tesla or Enphase, but they're a solid choice for TOU-focused customers.
The Tesla Powerwall 3 wins this head-to-head comparison, taking 4 out of 5 categories. It's the stronger choice for most homeowners, especially those who prioritize whole-home backup with a single unit. That said, the sonnen sonnenCore+ 10 is still a solid product and may be the better pick if you specifically need time-of-use rate optimization (buy low, sell high).
Our energy advisors can help you decide between the Tesla Powerwall 3 and sonnen sonnenCore+ 10 based on your specific home, budget, and energy goals.
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