How do I connect a battery to my solar system – Advice from Electriman, North London Electricians

Connecting a Battery to Your Solar System — What Homeowners Need to Know

Adding a battery to your solar setup lets you store surplus energy generated during the day and use it in the evening or during a power cut. However, the connection process involves high-voltage DC circuits that can be extremely dangerous if handled incorrectly.

How a Solar Battery System Works

Your solar panels generate DC electricity, which an inverter converts to AC for home use. A battery stores excess DC energy. Depending on your setup:

AC-coupled systems — the battery connects on the AC side via its own inverter (e.g. a Powerwall or SolarEdge Energy Bank)

DC-coupled systems — the battery connects directly to the solar charge controller or hybrid inverter on the DC side

What You Can Safely Check Yourself

Read your inverter's manual — confirm it supports battery storage and note the required battery voltage range (commonly 48V for most home systems)

Check compatibility — not all inverters accept batteries; you may need a hybrid inverter upgrade

Confirm your battery type — lithium (LiFePO4 is most common), lead-acid, or gel all have different wiring requirements

Check your consumer unit space — a battery system may require a new dedicated circuit and MCB

What You Should NOT Do

Do not attempt DC wiring yourself unless you are a qualified electrician — solar DC circuits can carry le

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Electriman covers Mill Hill, Barnet, Finchley, Edgware, Enfield, Watford and surrounding areas. All work is Part P certified and fully insured.