Running our home battery through its first summer has changed how I think about electricity bills.

Before installing the 13.5-kWh lithium-ion solar battery, our rooftop panels sent most of their midday production back to the grid. That felt wasteful, especially when we cooked dinner, ran the dishwasher, and charged the car after sunset. Now the battery stores that daytime energy and carries our house through the expensive evening peak.

Our utility’s peak rate is roughly 34 cents per kWh, while overnight power is closer to 14 cents. I set the inverter to prioritize self-consumption, then discharge from 4 p.m. until 9 p.m. On a normal weekday, that means we use about 8 kWh from stored solar instead of buying it at the peak rate. The daily saving is only around $1.60, but over a month it has been about $45, and the bigger benefit is avoiding those nasty high-usage bills during heatwaves.

I did have a scare in July. The battery stopped discharging at 62% after a firmware update, even though the app showed operation. I power-cycled the inverter, checked the backup reserve setting, and emailed support. They explained the update had reset the reserve to 60%, which was higher than my 20% setting. Once I changed it back, the battery resumed discharging that evening. It was not a failure, but it reminded me that energy storage still needs occasional attention rather than being completely invisible.

The system has not eliminated our electric bill, and cloudy stretches reduce the available capacity. Still, seeing the battery absorb surplus solar at noon and cover our peak usage feels like traction toward using less grid power.