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Battery charging question


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#31 MidAtlantic

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Posted 30 June 2020 - 03:26 PM

Not so much that it won't allow charging by solar panels, but that it won't allow charging of the truck battery(ies) by the camper's solar panels. It is a one direction charging device, not a bi-directional device like the later dual sensing ACR/VSR's are.

Oops, didn't see that he said truck battery.


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#32 Vic Harder

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Posted 30 June 2020 - 09:52 PM

Occurs to me that an older, single sensing ACR/VSR wired in parallel with the DC-DC converter and biased towards the truck batteries would allow automagical solar charging of the starting batteries while not interfering with the DC-DC converter's charging of the camper batteries.

 

That's intriguing.  Too bad I chucked my old 1314a in the garbage a while back..... 


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#33 rando

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Posted 01 July 2020 - 03:23 AM

You would want to be a little careful with putting an isolator in parallel with the DC-DC charger.   With it activated, it would be shorting the output of the DC-DC back to the input of the DC-DC.   If the voltage were to rise enough that the DC-DC thinks the alternator is running, it will switch on - I am not sure what would happen in that case, but a direct short between input and output is probably not a recommended configuration. 

 

If you want to have bi-directional charging you need a double throw relay.   That way it is either DC-DC or direct connection between the batteries, but not both.


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#34 ntsqd

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Posted 03 July 2020 - 10:34 PM

Good point. I was making the assumption that the two systems would never normally try to operate at the same time. Mr. Murphy, being who he is and all......

 

If the DC-DC converter has any sort of function indicator it shouldn't be too difficult to create a simple interlock (relay in the ACR/VSR's ground ref wire) so that the ACR/VSR can't operate while the DC-DC converter is operating.


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