2026-05-02 18:35 UTC
@edavies@functional.cafe and amper-hours is its own sin. Battery capacity is watt-hours, but when voltage is constant in some context, sure you can divide Wh by V and get Ah. It's usable, but… why??? Why not just use a standard unit :-)
Replies (1)
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@edavies@functional.cafe 2026-05-03 07:56
@isagalaev@mastodon.social Well, ideally battery capacity is megajoules. The worst crime against SI in this context is in sailing where practically all batteries used to be 12V so people are used to thinking about Ah capacities. Now 24 or 48V setups are getting a lot more common so a) people give “12V equivalent” capacities and b) don't make it clear when they're doing so. E.g., get 4 12V 100Ah batteries in two strings of two in series with the strings in parallel and call it a 400Ah 24V system. Arggggg…