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| Electrical QA CTEK DS250 https://auszookers.com/forum/viewtopic.php?f=37&t=50983 |
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| Author: | gregwatkins75 [ Tue Sep 08, 2015 10:55 pm ] |
| Post subject: | Electrical QA CTEK DS250 |
Hi smart ones. Currently building a camping style trailer, Have a CTEK charging my second/aux battery that I run a fridge and two lights and a couple of sub point off... Is there any reason I can't hook up a couple of correct gauge wires to the battery being charged by the CTEK And run them via an Anderson plug to my trailer to also charge a smaller AGM battery? Thanks in advance |
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| Author: | fordem [ Wed Sep 09, 2015 5:56 am ] |
| Post subject: | Re: Electrical QA CTEK DS250 |
Assumption #1 battery #2 is on the vehicle and battery #3 is on the trailer. Assumption #2 battery #2 and battery #3 are both AGM. Rule #1 - batteries should NEVER be paralleled unless they are of the same chemistry, capacity & age. When you break rule #1, the end result is reduced battery life - I'm not going to go into all the permutations & combinations, but I will say that different chemistries require different charge voltages (bulk charge & float charge) and you'll end up overcharging one and undercharging the other - a very similar thing happens when the ages & capacities are different, but in these cases the impact is greater on the discharge side of the equation, and the batteries will quite rapidly "equalize" themselves, and I use the term "equalize" in a layman's sense (it does have a very specific meaning when discussing batteries & charging) - the batteries will soon behave as if they are as small as the smaller capacity and as old as the older battery. In addition voltage drop across the cables & connectors (and yes, I did note that you stated "correct gauge wires") will cause the charge voltage at battery #3 to be lower than it is at battery #2, which will most likely result in undercharging - the CTEK will see battery #2, and adjust accordingly - in theory, you might "luck out" and because it's a smaller battery, it does charge reasonably well, but in reality how much charge it needs will be dictated by how much it has been discharged. |
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| Author: | gregwatkins75 [ Wed Sep 09, 2015 7:35 am ] |
| Post subject: | Re: Electrical QA CTEK DS250 |
Thanks Fordem... Both assumption 1 and 2 were correct. So it sounds like my idea was bad... Solar panel it will be. |
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| Author: | Marck [ Tue Sep 15, 2015 9:14 pm ] |
| Post subject: | Re: Electrical QA CTEK DS250 |
You could manually switch between them. Split the circuits after the d250s. A 3 way battery isolator for 40 bucks will sort it out or for a few more bucks you could do it electronically but in the end a manual process. I'd do this and solar so you have charging choices. Or just get a cheeper DC to DC charger for your camper. Marc |
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