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Badpuppy · 11-08-2023, 09:21 AM

12V system uses 1/2 the current of 6V for the same power. Unless you intend to power a heavy load with your battery with the engine off, a 20A meter should do just fine. In the other direction it should show a battery charge of only 1-2A most of the time.

The ammeter originally was intended only to show if the battery is charging or not.

11-08-2023, 09:21 AM	#11
Badpuppy Senior Member Join Date: Dec 2017 Location: Guthrie, OK Posts: 1,153	Re: amp meter question 12V system uses 1/2 the current of 6V for the same power. Unless you intend to power a heavy load with your battery with the engine off, a 20A meter should do just fine. In the other direction it should show a battery charge of only 1-2A most of the time. The ammeter originally was intended only to show if the battery is charging or not.