Batteries & Backup

Sizing a battery from your own load profile, the difference between backup and self-consumption, and the codes that decide where it can go.

Batteries & Backup September 8, 2026 Home Battery Installation Requirements: kWh Limits by Room The room you picked has a kilowatt-hour ceiling written into the building code, and your quote never checked it. Read the section before you pay a deposit. 17 min read
Batteries & Backup August 18, 2026 Home Battery Backup vs Self Consumption: Two Prices A backup battery earns nothing and a self-consumption battery protects nothing. Separate the two prices on your quote before you accept one payback number. 9 min read
Batteries & Backup August 17, 2026 Home Battery Sizing From Your Load Profile Pull your own interval data, then size a battery on it: why nameplate, usable kWh, depth of discharge and round-trip efficiency are four different numbers. 10 min read

About this section

Priya Raghunathan writes Kilowatt Ledger because three quotes for the same roof can produce three different payback figures, and the difference is always in assumptions nobody writes down. She does not work in the energy industry and has never sold, financed, or installed a system. Every number here is traced to a utility tariff sheet, a regulator's decision, or a published standard, and the arithmetic is written out so you can redo it on your own bill.

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How this is checked

Every guide cites the agency, statute, or document it was checked against, and carries the date it was checked. Rules change — if something here is out of date, tell us and it gets corrected.