Will my solar panels and battery keep working during a power cut?

Solar panels and a battery do not automatically keep your home running during a power cut. Backup needs to be part of the system design and installation.

If keeping the lights or selected appliances on matters to you, say so before requesting a quote. Ask for a clear description of what will work when the grid is unavailable, and what will not.

Why can solar panels stop during a power cut?

A conventional grid-tied solar inverter disconnects when the grid fails. Energy Saving Trust describes this as part of the inverter’s role in controlling the connection to the grid. Sunlight on the panels alone does not mean your home will still have power. Read Energy Saving Trust’s solar-inverter explanation.

Ask your installer to assess the existing inverter as well as the proposed battery. The answer needs to cover your complete installation.

What makes a battery system backup-capable?

Backup requires compatible equipment and an installation designed to supply the intended circuits while safely separated from the grid. Check the quote for the backup function itself, any gateway or switching equipment, and the work needed to connect the chosen circuits.

For example, Sigenergy’s Sigen Energy Gateway Home manual describes off-grid backup switching when used with its compatible batteries and inverters. That is a system feature; it is not evidence that every battery installation includes backup. See Sigenergy’s Gateway Home manual.

Which parts of the home should keep running?

Make a short priority list before discussing equipment. You might want lighting, a fridge and selected sockets, or you may want a broader assessment. Give your installer the actual appliances and ask them to identify which circuits would be backed up.

Then ask which appliances can operate at the same time. “Whole-home backup” still needs a clear explanation of the system’s limits and any loads that must be managed or left off.

Ask about the changeover to backup, too. Have the installer confirm the expected interruption for the proposed system and whether the equipment you want to use can tolerate it.

How long would the battery last?

Runtime depends on the energy available when the outage begins and what the backed-up appliances use. Battery capacity alone is not a promise of a particular number of hours.

Ask for an estimate using an agreed list of loads and a stated starting charge. Check whether the estimate includes solar generation and what it assumes about the weather.

If the system can hold a backup reserve, ask how that setting works and how it changes everyday battery use. Also ask what happens if the outage lasts longer than the stored energy.

Will the solar panels recharge it during an outage?

Ask this explicitly. Your installer should confirm whether the existing solar equipment can operate with the proposed backup arrangement, what happens when the battery is full, and how the system behaves after the battery reaches its lower operating limit.

A useful request is: “Please explain what happens during a daytime power cut, an overnight power cut and when the battery has little charge left.” Ask for the answers to be included with the proposal.

Put backup requirements in the quote

Before agreeing to the work, check that the proposal names the backed-up circuits, equipment, power limits, reserve assumptions and any excluded loads. Ask for a demonstration and operating instructions at handover.

Explore Evoflo’s backup-power options and tell us what you would want to keep running. If you already have solar, our battery quote checklist will help you gather the details for an assessment.