question

rodrigo-oliveira avatar image
rodrigo-oliveira asked

DC/DC + Smart IP 22 charger

Hi guys

I'm building a van, and I want to charge my auxiliary battery using the vehicle alternator and the 220v grid (of course, not at the same time

I already have:

- a Victron Blue Smart IP22 Charger 12/30 3output,

- a Victron 12/12 30A non-insulated DC/DV charger


With the 3 output IP22 Charger I wish to charge 2 independent batteries and feed my 12v fuse box while connected to the grid at a camping site

With the DC/DC I want to recharge the 2 independent batteries while driving

Are these 2 equipment protected from each other’s backflow ?

The last thing I want to do is to burn one of them (or both, or the System itself)


If they are not protected, how ’ should I do to get that protection?


Because the whole connection grid is already a bit complex, and I haven’t yet decided on whether install an MPP for solar panels or not…


image.jpg

Thanks in advance!




bluesmart ip22
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1 Answer
Justin Cook avatar image
Justin Cook answered ·

Your DC-DC charger does not connect straight to the alternator; the alternator connects to the start battery, and the DC-DC charger runs between the start battery (input) and the leisure battery (output).

Your IP22 AC-to-DC charger can charge two separate batteries as long as they share a common negative return path, yes. If one of the batteries being charged is the input battery (start battery) that the DC-DC charger is connected to, then this can create issues for you in that the DC-DC charger will be turning on when the input battery is being charged by the IP22 - there are multiple ways around that should the issue arise, however.

There is no danger of "backflow" current; multiple charge sources can be connected to a single battery with no issue.

Review the user and installation manuals for the components on the front end of the site (https://www.victronenergy.com/) as well as, perhaps, Victron's free book "Wiring Unlimited" to get a good overview of how electrical systems work and the considerations that must be taken into account when designing and installing one; if after reviewing the information you find you're still doubting the correct next steps to take, then get in touch with your nearest distributor or systems installer to have a discussion! https://www.victronenergy.com/where-to-buy


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