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Old 01-27-2021, 05:56 PM   #1
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1972 27' Overlander
houston , Texas
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Batteries and power converter

Hi, I've got a quick question, please.
My Optima AGM batteries are 110 amp and my power converter says it holds 100 amp. Are the batteries too much amperage for it?Click image for larger version

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Old 01-27-2021, 07:35 PM   #2
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If you are talking about the CCA (Cold Cranking Amps) or the AH (amp hour) rating of the batteries that has nothing to do with the convertor's DC rating.
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Old 01-27-2021, 07:43 PM   #3
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Quote:
Originally Posted by brendamoran View Post
Hi, I've got a quick question, please.
My Optima AGM batteries are 110 amp and my power converter says it holds 100 amp. Are the batteries too much amperage for it?Attachment 387675Attachment 387676Attachment 387677
I'm hoping the 100 amp is for max circuits out. We are less than 30 amp use. If it is for battery input, could we use a battery switch ?
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Old 01-27-2021, 08:14 PM   #4
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It sounds like you may be trying to equate the 30 amp AC input with the DC capability of your convertor and/or batteries. That's just my guess based on the question. For me a battery switch, solenoid activated or manual, is important.

This may be a little too complicated, at least for me, to be helpful through an online forum. I might suggest YouTube for some basic electricity vids. There are also some great videos on RV electrical systems.
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Old 01-27-2021, 08:16 PM   #5
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Your power distribution center is rated for 100 amps max but there will generally be a 50 Amp fuse or thermal breaker on the lead from the positive bus limiting the max to the 50 amps. Your batteries are rated for 110 Amp Hr each in energy capacity and likely have a combined maximum output capacity of about 1200-1300 cold cranking amps, or over 8 times what is required to fry the distribution center. But don't panic, because the batteries will only deliver what is demanded from them. The fuse or breaker will protect the cables and the distribution center from any short that might occur. So no worries you are in good shape.
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Old 01-28-2021, 04:10 AM   #6
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Thanks! That's an answer we were hoping for.
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Old 01-28-2021, 11:52 AM   #7
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Another way to think of it is like asking the question. My truck averages 20 miles to a gallon and has a 30 gallon tank, will it flood the engine if I fill the tank?
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Old 01-31-2021, 06:27 PM   #8
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Bacliff , TX
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If your distribution center is 100A that is the max it will safely pass through. Your battery is 110Ah lead acid optima which means that you have a usable 55Ah of energy. After 55Ah is discharged, you will be in the 12.1-12.2v range (lower if the amp draw is higher). Basically, if you were to pull 100A, you would have about 1/2 hr before you get to the point where it will start killing the battery and about 1 hr brefore the battery is dead. Also, the more amps drawn the less amps you have - in other words, you do not get 110Ah out of a 110Ah battery if you draw 40A. If you plan to draw a lot of energy and boondock, then you might consider lithium batteries. If you hang at facilities with shorepower then it is no big deal. Remember that all lead acid (flooded, AGM, Gel, Optimas) all need to be brought to 90-100% charge regularly (preferably daily) to get maximum life and prevent sulfation. Keeping your batteries in a partially charged state for extended periods of time and to discharge below 50% are sure ways to kill them quickly.
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