Battery Index: August 2025

Premium prices dip, performance batteries rebound, and commercial segment remains stable

sun.store shares fresh insights from its second edition of the Battery Index – a monthly report tracking energy storage pricing and brand dynamics across Europe. Drawing on real transactional data from Europe’s largest PV and storage marketplace, the Battery Index provides installers, distributors, and EPCs with reliable benchmarks and a clear view of how market trends are evolving.

Residential segment (up to 20 kWh): premium falls, performance rebounds

The most striking development in August came from the residential segment. Premium battery brands saw their average price fall by 7%, dropping from €311.54/kWh in July to €290.34/kWh in August. This marks the first meaningful decline of the year, suggesting that supply conditions are easing and competition among premium vendors is intensifying.

In contrast, performance-oriented brands moved in the opposite direction. Their average price climbed by 6% in August, rising from €150.35/kWh to €159.55/kWh. This rebound follows months of decline earlier in 2025, reflecting renewed demand for cost-efficient storage systems as installers seek affordable solutions for residential customers.

The result is a narrowing of the spread between premium and performance segments – though the gap still remains close to 100%, underlining the structural divide in the battery market.

“The drop in premium battery prices is a welcome sign for installers who were struggling with affordability. Meanwhile, the rebound in performance brands is most probably driven by shortages of some of the most popular brands. Whether the narrowing gap between premium and performance solutions is a sign of things to come – reflecting users’ growing reluctance to pay a high premium for premium products – or just a temporary shift remains to be seen.” – comments Grzegorz Furman, International Senior PV Trader.

Top 5 battery brands: August 2025

Huawei has consolidated its leadership, taking the top spot for the third consecutive month. In August, Deye overtook Dyness to claim second place, marking a shift in installer preferences. Meanwhile, Sungrow and Pylontech also swapped positions, with Sungrow moving into fourth and Pylontech rounding out the top five.

Commercial segment (20-120 kWh): stability dominates

Unlike the residential market, commercial storage prices remained relatively stable in August.

20–30 kWh systems ticked up slightly, moving from €245/kWh in July to €247/kWh in August.
60–120 kWh systems saw a minimal adjustment, edging down from €239/kWh to €238/kWh.

This stability suggests that commercial buyers are operating on longer project cycles, where prices move less abruptly.

Most offered products

The variety in the 20–30 kWh range underscores the segment’s role as a testing ground for installers and distributors seeking flexible, mid-sized solutions.