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Dutch energy storage specialist ATMOCE has launched the MS-8K-U PRO, an 8 kWh residential battery that pairs a 25-year warranty with a sub-30 V extra-low-voltage architecture and a Tier-1 LFP cell rated for 15,000 cycles. Together with the company’s MI-Series microinverters, the new unit completes what ATMOCE describes as the industry’s first 25-year residential solar and storage system.
The launch targets a structural mismatch in residential solar: PV modules are routinely warranted for 25 years, while batteries and power electronics have historically carried far shorter coverage. The gap forces homeowners to plan for mid-life equipment replacement — extra cost and uncertainty that ATMOCE argues undermines the long-term economics of solar-plus-storage.
The MS-8K-U PRO delivers 8 kWh of rated capacity from a 314 Ah lithium iron phosphate (LFP) cell at a nominal 25.6 Vdc, with a maximum DC voltage of 28.8 V. Rated output is 5 kVA (4.5 kVA continuous), with AC round-trip efficiency of 90% and DC round-trip efficiency of 96%.
| Parameter | MS-8K-U PRO |
|---|---|
| Rated battery energy | 8 kWh |
| Nominal capacity | 314 Ah |
| Nominal DC voltage | 25.6 V (max 28.8 V) |
| Chemistry | Lithium iron phosphate (LFP) |
| Cycle life | 15,000 cycles |
| Max output power | 5 kVA (4.5 kVA continuous) |
| AC round-trip efficiency | 90% |
| DC round-trip efficiency | 96% |
| Dimensions (H × W × D) | 830 × 480 × 195 mm |
| Weight (without bracket) | 76.5 kg |
| Operating temperature | −30 to 55 °C |
| Ingress rating | IP66 |
| Noise | < 35 dB |
| Warranty | Up to 25 years |
The headline technical claim is the extra-low-voltage design. Building on ATMOCE’s M-ELV platform, the system operates below 30 Vdc, avoiding the high-voltage DC bus common in residential batteries and eliminating the associated DC arc risk. The unit ships with a built-in AC system and no DC arc path, backed by precision sensing, thermal control and a fire suppression system.
This sits inside what ATMOCE calls its Trinity Safety design, which layers electrical, thermal and system-level protection on top of the architectural risk reduction. Compliance coverage includes IEC 62619, ISO 13849, IEC 63056 and IEC 62477-1, with galvanic isolation and an insulation resistance monitor as standard.
On the power conversion side, ATMOCE’s proprietary Cyclo-NovaFlux topology performs direct low-voltage DC-to-AC conversion, cutting conversion stages and system complexity. The AC-coupled architecture is positioned as retrofit-first: a single SKU supports third-party PV systems and inverters, and handles single-phase, three-phase and split-phase configurations.
The company cites up to 51 MWh of lifetime energy throughput from the 15,000-cycle cells, with matrix phase control for higher self-consumption and backup power support. Smart features run through the ATMOCE Cloud and ATMOZEN app, including dynamic tariff optimisation and a VPP-ready architecture for grid ancillary services.
“Ultimate LCOE is about creating value over the full period of ownership,” said Giorgio Chen, founder, chairman and CEO of ATMOCE. “A 25-year warranty is not simply a longer commitment. It must be supported by technologies designed for durability, efficiency and reliable performance over decades.”
ATMOCE MS-8K-U / MS-8K-U PRO Data Sheet (Rev. 1.0.0) — support@atmoce.com
ATMOCE press release, “ATMOCE Launches MS-8K-U PRO” — Frankfurt, 25 August 2026
