Common sense about solar power, only rely on it when the sun is shining. You do need sunlight to generate electricity with solar power, but what if there is no sunlight? Most people rely on electricity from the grid to supplement their solar power generation. But residential solar systems combined with battery storage—often called solar+storage systems—can provide power without relying on the grid for backup power, regardless of weather or time of day. Here are the benefits of a solar-plus-storage system:

24/7 power supply. If you use a utility billing mechanism called time of use and don't have a solar system, your electricity bill may be more expensive at night due to higher demand on the system. However, with battery storage, you can use the electricity you generate during the day at a later date, rather than relying on the utility for power. This is also useful if you live in an area with frequent power outages.

cut costs. If your utility company raises your electricity bill, you can use batteries to avoid this. Battery storage allows you to take advantage of low-cost energy that is already generated and stored, ensuring your rates are kept low and won't impact your monthly budget. In some cases, you can even sell the stored energy back to the grid and bank the profits when rates are higher.

Phone monitoring. A solar storage system can help you better track the energy your system produces with monitoring features that improve transparency and accuracy. These systems allow you to track the energy your home produces and uses in real time.

More energy self-sufficiency. While most jurisdictions require homes to be connected to a local utility, even if they don't use any utility power, a solar storage system will bring you closer to being "off the grid." Battery storage means you don't have to rely on the utility to power your home for most of the year. And you can keep some battery capacity at all times so that a power outage near your home won't affect your life.

A solar storage system can cost around $25,000 to $35,000, depending on the size of the battery and other factors. It is easier and cheaper to install both the panel and the battery at the same time. However, if you already have solar panels installed and want to add storage, you can: Batteries range from $12,000 to $22,000. Ask your solar installer if they can add batteries to your system.

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