Battery energy storage

                                                          http://www.tacbattery.com/products.htmlBattery energy storage

It's important to be aware of the following:

Batteries have a limited lifetime: they will only last a certain number of years and can only be recharged a certain number of times.
To preserve the life of your battery, you may not be able to use all of its charge. For e.g. some batteries should only be discharged to 50% (this is called 'depth of discharge').
As electricity moves in and out of your battery, some energy is lost along the way. How much energy is lost when your battery is used (also known as its round trip efficiency) will depend on the type of battery.
Some household battery systems are designed to be scalable, which means the amount of electricity stored can be increased by joining batteries together (like adding panels to a solar system). This can help meet changing energy needs over time.
A special room or enclosure may need to be built to house the batteries.
Consider the amount of batteries you need, and whether they'll be able to supply the immediate power (start-up current) required for your appliances.