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post #1 of 5 (permalink) Old 28-06-2020, 10:14 Thread Starter
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Question Battery to Battery Charger/ Solar Controller

Hello, first post, thanks for having me etc. I'm in the process of converting my VW LT to a camper and trying to make my mind up with electrics. As a main power source I'm going to have solar which will be sized to be sufficient the majority of the time. For dark dingy winter days I'd like a back up though, also off-grid.

Relays sound like they can end up being more problems than they are worth, so I've been looking at a battery to battery charger (which can also have an integrated solar controller such as- https://jgtech.com/Merlin-DMT30A.html).

Althought they're designed to have minimal impact on battery life, what I'm wondering is if anyone knows how much impact it might have on the starter battery life? Since the solar system will hopefully be sufficient most of the time, would it be better for the starter battery and alternator to have switch the connection to the B2B charger to only use it when its actually needed rather than all the time?

Thanks very much
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post #2 of 5 (permalink) Old 28-06-2020, 23:11
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Hi Chris, welcome to the forum.

I have a B2B but know nothing about it! I just know it hasn't given me any problems!

So I'm just giving your post a bump cos there are lots of folk on here are experts in these things!

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post #3 of 5 (permalink) Old 29-06-2020, 14:57
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https://forums.motorhomefacts.com/at...1&d=1593437428

Hi Chris,

Im a bit uncertain from your post what your ultimate aim in your requirements might be as regards usage, how and when, to what extent, what periods of time away, time of the year away from home etc., and of course weather conditions wherever you wild camp.

To try to move your post along a bit Im wondering if what I installed in my motor home is maybe along the lines you are planning. I have a 140w solar panel on the roof, a controller, two 80Ah linked leisure batteries and obviously the vehicle battery. The positive terminals are are linked together via a Victron Cyrix battery combiner ( see photo )( 1st. attempt at posting photo, so sorry its a bit small !!) which shares the output from the solar panel equally between them.

Whilst your MH maybe is not being used in the first Winter months it keeps all batteries fed and whilst away during the Summer with plenty of output from the solar panel it is adequate for battery support plus internal lighting, although one has to be sensible and not push ones luck with other power requirement needs.

What Ive described is maybe not exactly what youre looking for but maybe help you along the way?

Mick

P.S. This particular brand, Victron is produced in three versions, 120 / 230 / and 400 amp by the way
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Last edited by shingi; 29-06-2020 at 15:03.
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post #4 of 5 (permalink) Old 29-06-2020, 15:12
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The term 'Battery-to-battery' charger is a bit of a misnomer. It is normally used to describe systems that run from the alternator to charge engine and domestic batteries at high charge rates when the alternator controlled only by a automotive voltage regulator will reduce the charge. They only work when the engine is driving the alternator.



I am not sure if the OP is using the term in this sense.


Geoff
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post #5 of 5 (permalink) Old 29-06-2020, 15:21
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Im not sure either, but perhaps hell tell us when hes on next. Cheers
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