Battery storage and time-of-use rates: why the two go together

Solar produces most heavily in the middle of the day. Household demand peaks later -- people come home, air conditioning runs, cooking starts, cars go on to charge. Under time-of-use rate structures, now standard for California residential customers and spreading through utilities in other states, that later window is also when electricity costs the most.

So without storage you are exporting cheap midday production and buying back expensive evening power. A battery closes that gap by banking daytime generation and discharging it during the expensive hours instead.

A standard grid-tied solar system shuts down during a power outage. That is a safety requirement, not a defect -- it prevents back-feeding a line that utility crews may be working on.

Pair the system with a battery and a compatible configuration and you can keep selected circuits running when the grid is down. How much you can run, and for how long, depends on the battery's capacity and which circuits are on backup. It is worth being specific about that at design time rather than assuming whole-home backup.

California's net metering rules have been revised more than once, and the current structure credits exported energy less generously than earlier versions did. Other states have moved in the same direction at their own pace, so the principle travels even where the specific rules differ. The direction of that change makes storage more attractive rather than less: the less an exported kilowatt-hour is worth, the more value there is in keeping it and using it yourself.

We are not going to quote you a payback period here. It depends on your rate schedule, your usage pattern, the capacity you install and rules that regulators have shown a willingness to revise. What we will do is model it against your actual bill and current rules during the consultation, and label it as an estimate, because that is what it is.

Not necessarily. Plenty of systems are installed without storage and add it later, and plenty of households get most of the benefit they were after without one. It depends on your rate structure, how much of your usage falls in expensive hours, and how much outage resilience matters to you.

Battery systems carry their own manufacturer warranty, typically in the 10 to 15 year range depending on the product, which is separate from the 25-year coverage on panels, inverters and our workmanship.