I installed a 10kWh lithium iron phosphate battery last autumn, after watching my electricity bills climb despite having 4.5kW of rooftop solar. The quotation process was less intimidating than I expected: the installer checked my consumer unit, measured the wall space, and explained how the battery would charge from solar before exporting surplus. I specifically searched for a "lithium iron phosphate battery uk" because I wanted something suited to our colder winters and indoor garage location.

The physical installation took most of a day. The battery went beside the inverter, and the electrician labelled everything clearly. I appreciated that he set a reserve level rather than leaving the system empty. Mine is set at 20%, enough for the router, fridge, and a few lights during an outage. The app was frustrating: it initially showed the battery as offline. Restarting the communications hub fixed it, and the problem has not returned.

The biggest difference appears between 4pm and 7pm, when our time-of-use rate jumps. Before storage, I imported electricity during that window even on sunny days, because the panels had stopped producing much. Now the battery automatically discharges first. On a typical weekday, I see roughly 6–8kWh supplied from storage, cutting my evening grid use dramatically. My winter bills have not vanished—short days and heating still cost plenty—but the monthly direct debit is usually £35–£50 lower than last winter.

I check the battery app occasionally, but do not constantly monitor it. On weekends, solar fills it by afternoon, and we cook dinner using stored energy instead of buying peak electricity. During a power cut, Wi-Fi stayed connected. It has not made us energy independent, but it makes our solar investment more useful. For me, proof is simple: I export less, buy less at peak rates, and feel less annoyed when sun sets.