A solar battery may be worthwhile if your home uses a lot of electricity in the evening, has limited access to feed-in tariffs, or wants greater backup during outages. Whether it pays for itself depends on the battery’s size, installed cost, electricity usage, tariff, export rate, and expected lifespan. Batteries can also lose capacity over time, and not every system provides whole-home backup, so check what essential circuits are covered. Compare quotes from accredited installers and review your retailer’s current rates before deciding.