![]() Most people are using home batteries for storing solar electricity, but battery levels can be low in the mornings. This means you keep your battery partially full with your emergency electricity. You’ll need to decide what percentage of your storage capacity you want to reserve for backup. How much storage capacity do I need for a back-up battery in my home? This is what the Tesla Back-up Gateway does, for example. It needs to be located between your incoming supply and your main fuseboard, so you will need space for this. It’s essentially a big switch, which detects that the drop in voltage on the grid in the event of a power cut, and disconnects the home from the grid. Instead, backup battery systems have a relay to physically disconnect the electricity supply in a building from the grid (called islanding). ![]() It is possible to run a home off a battery during the power cut, but the controls for a conventional home battery are not currently good enough – if they don’t operate 100% perfectly, there would still be the risk of electrocution, and if the battery does not operate properly it does not ‘fail safe’. It is for this reason that solar inverters turn off in the event of a power cut. If there’s a power cut, engineers will need to work on the electricity lines on the grid, and there cannot be the risk of any form of generation or batteries making this live while they carry out their works. The main complexity with using batteries for backup power is that they have to comply with strict safety requirements. ![]() Sadly, it’s a little trickier than that, so here are the key things you’ll need to consider. It sounds easy – there’s a power cut and so you just run your home off the battery instead. How does a home backup battery system work?
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