I installed a 10 kWh lithium iron phosphate battery beside my inverter last spring, mainly to stop buying expensive evening electricity.

Before the battery, my rooftop solar system exported most of its midday production, while our family cooked, showered, and ran the heat pump after sunset. The utility's time-of-use rate made those hours painful, even though the panels often produced more than we needed.

I built the pack around lifepo4 280ah cells, added a battery management system, fuses, disconnects, and a wall-mounted enclosure, then had an electrician check the wiring and permits.

The setup wasn't glamorous. The electrician spent most of a morning tracing circuits and testing the automatic transfer behavior, but everything worked without rewiring the house.

On the first clear day, the battery charged from about 10 a.m. until late afternoon, reaching 96 percent before the solar output faded. At 6 p.m., the inverter switched from solar to battery automatically. Our evening usage—oven, dishwasher, lights, Wi-Fi, and heat pump—pulled roughly 5 to 7 kWh, yet the meter barely moved during the peak window.

That felt more satisfying than the app's pretty graphs: I could actually see consumption staying local instead of selling power cheaply and buying it back at triple the price.

One week, the battery stopped discharging at 30 percent. I initially blamed the inverter, but the monitoring screen showed a low-temperature protection warning during an unusually cold night. After raising the battery room temperature and rebooting the system, it resumed normally. Now I keep the enclosure above 10 degrees Celsius and leave a little ventilation space around it. This was a useful reminder that battery storage still needs sensible placement, even when the chemistry is marketed as safe and durable.

For me the win is simple: solar power covers daytime needs, the battery handles dinner and evening bills.