Battery Test on M1G

I'm curious as to why when I do a battery test, or run only on battery power, the current draw drops.
My normal standby load is .550A and when I'm on battery power it drops to .270A.

Can someone explain this to me?

Just realized something... could the difference be how much current the battery charger is using for the trickle charge?

Some drop will occur because of lower voltage. The battery runs at 12v and when plugged in it runs just under 14v.

How are you measuring the current draw?

I'd wager to say the ammeter on the M1 isn't factoring in the lack of draw from the rectifier when running on DC only vs AC/DC.

Lou Apo said:

How are you measuring the current draw?

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I'm getting the measurement from the keypad. My normal voltage is 13.9 and the initial battery voltage is around 13.1

video321 said:

I'm getting the measurement from the keypad. My normal voltage is 13.9 and the initial battery voltage is around 13.1

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The voltage drop will cause roughly 6% drop in amps. I don't know if the amp measurement at the keypad includes the amps going to charge the battery, but if it does, that will fall out when you switch to battery (as you pointed out).

You could always try manually measuring the amps and see what happens with that.