Loading NuWatt Energy...
We use your location to provide localized solar offers and incentives.
We serve MA, NH, CT, RI, ME, VT, NJ, PA, and TX
Loading NuWatt Energy...
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 QuoteReview, specs, and the honest install recommendation.
Quick Answer
sonnen sonnenCore+ 10: 10 kWh LFP battery with 4.8 kW continuous / 8.5 kW peak output. NuWatt installs this as our tou-arbitrage pick. best cycle-count warranty in the industry and smart operating modes make this the pick for homeowners who want to optimize buy-low-sell-high with utility rates.
Our TOU-arbitrage pick. Best cycle-count warranty in the industry and smart operating modes make this the pick for homeowners who want to optimize buy-low-sell-high with utility rates.
Capacity
10 kWh
Continuous
4.8 kW
Peak
8.5 kW
Warranty
10-yr
Price
$15.0-17.5k
Key features
Best for
Spec sheet
Made in Germany
Run the math yourself
Pick the appliances you need during an outage and see exactly how long the sonnen sonnenCore+ 10 will run them.
Pick what stays on during an outage
Critical loads
4 selected
Simulated runtime
Battery can handle thisRuntime
1.6
days
Avg load
0.2
kW (of 4.8 kW max)
Peak surge
3.5
kW (of 8.5 kW peak)
Runtime calculated from 10 kWh usable × 93% round-trip efficiency = 9.3 kWh effective storage, divided by average load. Duty cycles assume intermittent operation (fridges cycle ~40% of the time, AC ~50%).
Brand stability
sonnen GmbH is a German home battery manufacturer acquired by Shell (formerly Royal Dutch Shell, NYSE: SHEL, $250B+ market cap) in 2019. Premium European engineering with one of the longest cycle warranties in the industry (10,000 cycles on sonnenCore+).
Last reviewed: 2026-04-09
Federal ITC / domestic content
sonnen manufactures in Germany. Safe for federal ITC qualification on commercial projects but not US-manufactured, so does NOT qualify for the 10% domestic content adder.
Informational only — not tax advice. Confirm ITC qualification with a tax professional.
Free instant estimate. Takes 60 seconds. No pressure.
Start my free quoteFrequently asked
Yes. The sonnen sonnenCore+ 10 is in our active install stack across all 9 states we serve (MA, CT, NH, RI, VT, ME, NJ, PA, TX). Reach out through the quote form for a free site assessment and installed-price quote.
The sonnen sonnenCore+ 10 has 10 kWh of nameplate capacity and 10 kWh of usable capacity — full nameplate capacity is accessible. Use the interactive outage simulator on this page to see exactly how long that capacity will run your specific appliances.
The sonnen sonnenCore+ 10 uses LFP chemistry. LFP (Lithium Iron Phosphate) is the safest residential battery chemistry available, with no thermal-runaway risk and typical cycle life of 5,000–10,000 cycles. LFP is the dominant chemistry for new residential battery products in 2026.
10-year product warranty with a 10,000-cycle guarantee (whichever comes first). sonnen's warranty is backed by a financially stable parent company with a mature US warranty-service infrastructure.
Yes. Residential home batteries remain eligible for the 30% federal Investment Tax Credit in 2026 when paired with solar (Section 48E) or installed standalone under the IRA provisions. This is different from the residential solar panel credit (Section 25D) which expired December 31, 2025. For commercial ITC projects, see the FEOC section on this page for domestic-content-adder eligibility.