Backup planning fails in a predictable way: the battery is chosen first, by price or by headline capacity, and the loads are negotiated afterwards — during the first outage. This guide reverses the order.
Sit down in daylight and decide which loads the backup exists for. Refrigeration, lighting, communication and security make almost every list. Air conditioning, water heating and heavy machinery make almost none — not because they are unimportant, but because carrying them through an outage multiplies the battery beyond proportion. Write the list down, with the hours each load must run, and treat additions to it as what they are: purchases of more storage.
Then consider the outage you are actually planning for. An area with short, frequent cuts needs fast, reliable changeover for modest loads. An area with long, rare cuts needs endurance. The same battery serves these two problems very differently, and the configuration should say which problem it answers.
The backup list should travel with the quotation and the order, so the delivered system can be checked against it. During commissioning, test the list: cut the supply and confirm that the listed loads, and only the listed loads, are carried. Surprises found in testing are free; surprises found in the first real outage are not.
Before ordering, confirm the minimum order quantity and lead time for your configuration, and ask which documents apply to the exact system you are quoted.
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