How do I size a battery for my home installation? Although it appears to be a simple enough question, it is however just as complicated as asking “how do I determine the ‘right’ range for my EV” i.e. there is no ‘one size fits all’ answer. If you can afford to spend more it then the answer is usually much more straightforward… get as much as you can! However, in most cases there is a budget limit and so this post is a guide on some things you might want to think about and how you might approach the decision on battery size.
If you have solar but no battery, most of your energy is sent to the grid and you’ll get a fraction of what you would have to pay to buy it back in from your supplier. The battery allows you to use that generated energy yourself and not pay more for it than you should.
If you are a high user of electricity (with no solar), a battery can help you get your energy for less. By signing up to a time of use tariff like Octopus Go, you can charge the battery on cheap electricity at night and then use this to meet your needs during the day.
It is therefore of huge benefit to have a battery that is big enough to store at least you average daily home electricity energy usage. This though will need to exclude your Electrical Vehicle from the home consumption because it is unlikely that you’ll find a cost viable battery at a size big enough to charge your EV from empty to full!
3nergyTech 