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Old 08-04-2013, 10:28 AM   #1
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Charging current vs draining current

Is there a way to tell if you're getting amps into a battery charging it vs amps flowing out of the batery draining it?

If I hook the ammeter up on the negative side in series vs the possitive side... is that drain vs charge?

How would you tell?

Thanks
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Old 08-04-2013, 12:56 PM   #2
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Eazy.

Red wire towards positive, black wire towards ground ALWAYS.

So, if using ground side of battery with ammeter then black wire to ground, red wire towards positive which is battery.

When charging the meter will read positive, discharge will read negative.

However only do this for test as most meters have limited range unless you use a shunt.
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Old 08-04-2013, 01:33 PM   #3
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Quote:
Originally Posted by TQ60 View Post
However only do this for test as most meters have limited range unless you use a shunt.
A DC clamp meter like this is ideal for RVs:

MS2108 RMS DC Clamp Meter Compared W Fluke Inrush Curre | eBay

It can handle 600 amps AC/DC without having to tap into the circuit. It also read Hz for checking out or setting up your generator. And since it reads True RMS voltage, it's great for working with inverters.

I always carry one of these with me.
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Old 08-04-2013, 02:20 PM   #4
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Thank you! This is great info; I just need to make sure I fully understand what you're telling me.

Quote:
Originally Posted by TQ60 View Post
So, if using ground side of battery with ammeter then black wire to ground, red wire towards positive which is battery.
So the red (on the meter) is 'positive' in this scenario even if it is hooked up on the negative battery post. Right?

Quote:
Originally Posted by TQ60 View Post
When charging the meter will read positive, discharge will read negative.
So positive amps are charging the battery no matter which side I hook into, right?
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