On Sat, 22 Jun 2019 22:03:07 +0100, Mark Lloyd wrote:

On 6/21/19 5:55 PM, Commander Kinsey wrote:

[snip]

I guess charging a car battery with a charger plugged into the house
won't work if you have a load in the car like lights (or in my case a
faulty alarm). The charger will think the battery is still drawing a
fair current and isn't full, when in fact it's the load eating it up.

I've tried it with an automatic charger. If the load is enough that the
battery won't change within a certain time, the charger stops and
indicates an error.

That would be useless to me. I've bought a 16 amp 13.8V power supply intended for CB use. Not sure what happens if I try to draw more than 16 amps, but that shouldn't happen. It's short circuit protected, I'd prefer a current limiter but it may just switch off and need reset.