By the PES Supply Editorial Team — Reviewed July 2026
Sonnen (formerly Sonnenbatterie) is a German-engineered residential battery company that pioneered the all-in-one LFP energy storage system. With its sonnenCore+, sonnenBatterie Evo, and the new sonnen Battery 11, the company offers fully integrated AC-coupled systems backed by a class-leading 10,000-cycle warranty. Sonnen's virtual power plant (VPP) ecosystem and community energy sharing platform set it apart from battery-only competitors. This guide covers the full Sonnen lineup, certifications, warranty, and competitive positioning.
PES Supply carries Sonnen products among our catalog of 50,000+ SKUs from 169 authorized brands, with delivery in 7–10 business days. Browse our solar battery selection or shop Sonnen at PES Supply.
1. Company Overview
Founded in 2010 in Wildpoldsried, Bavaria, Germany, Sonnen (then Sonnenbatterie) was one of the first companies to market a fully integrated residential battery system with built-in inverter and energy management software. The company uses lithium iron phosphate (LFP / LiFePO₄) chemistry exclusively, citing its superior thermal stability and cycle life compared to NMC alternatives.
Sonnen's market position is defined by its all-in-one system approach and 10,000-cycle warranty. Unlike BYD or EG4, which sell battery modules that require a separate inverter, Sonnen's systems include the battery, inverter, and energy management software in a single cabinet. This simplifies installation but locks customers into the Sonnen ecosystem. The company also operates sonnenCommunity, a virtual power plant and energy-sharing platform that allows members to share surplus solar energy.
Sonnen was acquired by Shell New Energies in 2019, giving it the financial backing of a major energy company. The company has expanded into the US market with UL-certified products designed for North American electrical codes.
2. Current Product Lines
- sonnenCore+ (SCORE-P10) — 10 kWh all-in-one LFP battery system with built-in 4.8 kVA inverter and smart energy management. AC-coupled, indoor floor-standing. Stackable up to 60 kWh. 10-year or 10,000-cycle full-system warranty (battery and inverter). Peak inverter efficiency: 94.4%.
- sonnen Battery 11 — The latest generation residential system, modular in 5 kWh increments. Configurable at 10, 15, 20, 30, 45, or 60 kWh. AC-coupled, NEMA 3R / IP65 outdoor-rated. Up to 8 kW continuous AC output per inverter unit. 10,000+ cycle life. Supports 12+ grid services.
- sonnenBatterie Evo — AC-coupled all-in-one system with 10 kWh usable capacity. IP56 rated for indoor/outdoor use. 5 kW continuous output, 7 kW surge. Backup power included. 10-year or 10,000-cycle warranty.
- sonnenBatterie hybrid 9.53 — DC-coupled hybrid system, modular from 2.5 kWh to 15 kWh nominal capacity. German engineering with LFP chemistry. 10-year or 10,000-cycle warranty.
- sonnenBatterie eco — The established eco line, available in 10 kWh and 15 kWh configurations. 80% capacity retention at year 10 — the highest verified retention figure among major residential battery brands.
3. Recent Releases (2025–2026)
- Sonnen Battery 11 (2025–2026) — The newest residential platform, featuring 10,000+ cycle life, modular 5 kWh expansion up to 60 kWh, NEMA 3R outdoor enclosure, and support for 12+ grid services including ERCOT ancillary services. This is Sonnen's flagship US product.
- Software version 1.25.7 (January 2026) — Mandatory firmware update addressing stability issues with certain inverter configurations across sonnenBatterie 10, Eco 9.43, and Eco 8.2. Fixed a charging/discharing issue with a specific internal inverter type.
- sonnenCore+ expansion — The sonnenCore+ platform with 10 kWh base capacity and stackable configurations up to 60 kWh represents Sonnen's push into the US market with UL 1741-SB smart inverter compliance.
4. Certifications & Listings
- UL 9540A — Thermal runaway / fire-propagation testing passed.
- UL 1741-SB — Smart inverter certification for grid interconnection (IEEE 1547-2018 compliance).
- UL 1973 — Stationary battery safety certification.
- IEEE 1547 — Grid interconnection performance standard.
- UN 38.3 — Transport safety certification.
- BABA compliance — Sonnen products are available through BABA-compliant channels where applicable; verify per-project for US federally funded installations.
5. Warranty & Cycle Life
Sonnen offers one of the most robust warranty packages in the residential battery market:
- 10-year or 10,000-cycle warranty — Covers the complete system, including battery modules AND inverter. This is notable — most competitors warranty only the battery, not the inverter.
- Capacity retention: 80% capacity retention at end of warranty term — the highest verified year-10 retention figure among major residential battery brands.
- Cycle life: 10,000+ full charge-discharge cycles. At one cycle per day, that is over 27 years of rated design life.
- Transferable: The warranty is transferable to new homeowners, supporting home resale value.
The 10,000-cycle figure is approximately double the cycle rating of many competitors (BYD: 6,000; EG4: 6,000–8,000). This reflects Sonnen's conservative cell management and BMS design, which prioritizes longevity over maximum instantaneous power.
6. Popular Products at PES Supply
| Model | Capacity | Voltage | Chemistry | Cycle Life | Price Range |
|---|---|---|---|---|---|
| sonnenCore+ (SCORE-P10) | 10 kWh | AC-coupled | LFP | 10,000 cycles | $12,000–$16,000 |
| sonnen Battery 11 (10 kWh) | 10 kWh | AC-coupled | LFP | 10,000+ cycles | $12,000–$16,000 |
| sonnenBatterie Evo | 10 kWh | AC-coupled | LFP | 10,000 cycles | $9,000–$12,000 |
| sonnenBatterie hybrid 9.53 | 9.53 kWh | DC-coupled | LFP | 10,000 cycles | $8,000–$11,000 |
7. Technical Comparison
| Metric | Sonnen Core+ | Tesla Powerwall 3 | BYD HVM 11.0 | Fortress eVault |
|---|---|---|---|---|
| Usable capacity | 10 kWh | 13.5 kWh | 11.04 kWh | 18.5 kWh |
| Built-in inverter | Yes (4.8 kVA) | Yes (~11 kW) | No | No |
| Cycle life | 10,000 | Unlimited (time-based) | 6,000+ | 6,000+ |
| Year-10 retention | 80% | 70% | 60% | 70% |
| VPP / grid services | Yes (12+) | Yes | Depends on inverter | Yes (Guardian) |
| Max system | 60 kWh | ~54 kWh | 66.2 kWh | Modular |
Sonnen's advantage is cycle life and system completeness: the 10,000-cycle warranty covering both battery and inverter is class-leading, and the 80% year-10 retention is the highest verified figure in the market. The trade-off is a higher price per kWh than modular competitors — you pay a premium for the all-in-one integration and the longest warranty.
8. BMS & Monitoring
- Integrated BMS: Sonnen's BMS is built into the system and tuned for daily deep cycling with conservative cell management that prioritizes longevity.
- sonnenConnect: Cloud-based monitoring platform with iOS and Android apps providing real-time state-of-charge, production, and consumption data.
- Energy management: Time-of-use optimization, self-consumption maximization, and backup modes are built into the system software.
- Virtual power plant: Sonnen supports 12+ grid services including frequency regulation, peak shaving, demand response, capacity dispatch, and ERCOT ancillary services.
- AC-coupled: The Core+ and Battery 11 are AC-coupled, meaning they work with any existing or new solar system without requiring a specific DC inverter.
9. Installation Notes
- Form factor: All-in-one floor-standing cabinet (Core+: 27 × 69.5 × 14 in, 353 lb). Indoor installation for Core+; the Battery 11 and Evo are outdoor-rated (NEMA 3R / IP56).
- Communication: Proprietary Sonnen communication protocol. No CAN/RS485 exposed — the system is self-contained.
- Temperature range: -10°C to 50°C (14°F to 122°F) operating range.
- Venting: LFP chemistry requires no active venting. Sealed enclosure with passive thermal management.
- Coupling: AC-coupled systems (Core+, Battery 11, Evo) work with any existing solar inverter. The hybrid 9.53 is DC-coupled for new solar installations.
- Backup power: Standard on all current models. The Core+ provides up to 76A peak (single unit) for motor starting; more in stacked configurations.
10. Frequently Asked Questions
Does the Sonnen warranty cover the inverter too?
Yes. Sonnen's 10-year or 10,000-cycle warranty covers the complete system — battery modules AND inverter. This is a significant differentiator, as most competitors warranty only the battery and offer a separate (often shorter) warranty on the inverter.
Can I use Sonnen with my existing solar system?
Yes. The sonnenCore+, Battery 11, and Evo are AC-coupled, meaning they connect to your AC electrical panel and work with any existing solar inverter brand. You do not need to replace your solar inverter. The hybrid 9.53 is DC-coupled for new installations.
What is sonnenCommunity?
sonnenCommunity is a virtual power plant and energy-sharing platform that allows Sonnen battery owners to share surplus solar energy with other members. In supported markets, members can also participate in grid services and earn compensation for dispatching stored energy during peak demand periods.
How does the 10,000-cycle warranty compare to other brands?
Sonnen's 10,000-cycle rating is approximately double the cycle ratings of BYD (6,000+), EG4 (6,000–8,000), and Pylontech (6,000). At one cycle per day, 10,000 cycles equals over 27 years of design life. The warranty guarantees 80% capacity retention at end of term — the highest verified figure among major residential battery brands.
Is the Sonnen system expandable?
Yes. The sonnenCore+ starts at 10 kWh and can be stacked up to 60 kWh. The Battery 11 is modular in 5 kWh increments, configurable at 10, 15, 20, 30, 45, or 60 kWh total. Expansion requires adding additional Sonnen units — you cannot mix with third-party batteries.
11. Shop Sonnen at PES Supply
PES Supply carries Sonnen all-in-one battery systems among our 50,000+ SKUs from 169 authorized brands. Delivery in 7–10 business days.
Explore our full solar battery collection or contact our team for Sonnen system sizing and VPP enrollment guidance.