Key points
- Batteries add most value on sites with strong evening loads
- Grid-services revenue becomes real above ~100 kWh capacity
- Look for 10-year warranties and 6,000+ cycle life
- Storage isn't automatic — model it against your load profile first
What a battery does
It stores surplus daytime generation for use in the evening — pushing self-consumption from 60% up towards 90% on the right sites.
When it pays back
Sites with a strong evening load (hospitality, gyms, care homes) get real value. Sites that shut at 5pm typically don't.
Grid-services revenue
Larger batteries can earn additional income through flexibility markets like DFS and Dynamic Containment — worth exploring above ~100 kWh capacity.
Warranty and life
Look for 10-year warranties and cycle life above 6,000. Cheaper cells rarely make economic sense at commercial scale.
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