Which would you choose, Projecta IDC 25 or Wirthco Battery Doc - Page 2 - Ram Promaster Forum
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post #11 of 19 Old 04-11-2017, 05:41 PM
MsNomer
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And also ignore the admonitions against pairing dissimilar batteries?
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post #12 of 19 Old 04-11-2017, 07:22 PM Thread Starter
medicineman4040
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OK thanks for the thoughts.
Now here is my problem-
14.1 and 13.6
I went to the manufac's website on my
VmaxTank 6 volt batteries.
Here it is, see if you see what I see multiplying by 2-
https://www.vmaxtanks.com/V6-225-6Vo...ery-_p_48.html

So my recommended charge is 14.1 correct? I do think so, and
that is way less than what is reported from users of the Battery Doc via the starter battery.
The Projecta IDC 25 is 14.4 I think.
So either way I go I am potentially overcharging the coach batteries. VmaxTank says 10 years possible
if I did it the correct way.

Solar charge controller and Samlex Inverter-charger are already programmed (by me) for 14.1 and 13.6.
Maybe I'm missing something.
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post #13 of 19 Old 04-11-2017, 09:10 PM
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I see no problem in mixing an AGM house battery bank with a flooded starting battery -- their chemistry is the same. The flooded battery has liquid electrolyte and the AGM has essentially the same held in glass mats soueezed between the plates without excess fluid covering all. The AGMs are "sealed valve regulated" having pressure containing caps. These allow some pressure buildup within the battery so gases are contained and recombined so no fluid is lost.

If the house battery bank is composed of 2 or more batteries I suggest they be the same type and age so they are discharged equally.
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post #14 of 19 Old 04-12-2017, 10:13 PM Thread Starter
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SeaPro I hear ya, and I know your years of practical experience.
I'm going in this charging thing believing that the van battery is AGM and
I know my house batteries are AGM.
That said the Projecta is installed. Correctly? Well I can't say with 100 percent certainty
But the manufacturers specs said 14.1 for my AGMs, and every other AGM I see is 14.4 or greater.
No problem, I just set the Projecta to Gel which is 14.1.
Too cautious? Probably.
Won't matter in a 100 years!
Hey, may not matter in days with the world as is.
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post #15 of 19 Old 04-13-2017, 11:54 AM
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Gel cells (relegated these days to very specialized applications where extremely severe vibrations are encountered or extremely long -- like 20 years -- standby are desired) are definitely best charged at a lower voltage than flooded or AGMs. Also note that our digital voltmeters and the internal sensors within most chargers are only accurate to one tenth of a volt and are often off by two tenths!
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post #16 of 19 Old 04-19-2017, 07:02 PM
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Seapro,

I think I read that you use the Blue Sea ACR. I read on their site that it be installed only when "the largest battery bank cannot exceed group 27". What do they mean by this? Are they talking about the physical size of the battery or batteries above a certain amp hours capacity?
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post #17 of 19 Old 04-19-2017, 08:58 PM
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I use the Blue Sea ACR model SI-ACR rated for 120 amps. I have used this in 2 van applications and 1 boat application where the house battery is a size 8D AGM rated about 230 amp hours. I don't care how big the alternator or van battery is because the charging current never gets near to 120 amps due to the internal resistance of the battery being charged. In fact, careful study of posts on various threads of this forum concerning fusing of the wire from the van battery (thus alternator) to the combining relay shows that many of us fuse this wire for only 80 or 100 amps. We are not blowing 100 amp fuses. The Blue Sea product rated for 120 amps has done well for me and others. Unless your house battery is substantially oner 300 amp hours the internal resistance should keep the charging current below 100 amps.
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post #18 of 19 Old 04-20-2017, 12:13 PM
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Seapro, what gauge wire did you use with the ACR? Would it be acceptable to use two Blue Sea 187 Series circuit breakers on this?
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post #19 of 19 Old 04-20-2017, 05:08 PM
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I can't recall for sure but I think I used size 6 wire as my runs are short. I prefer fuses than circuit breakers for this application.
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