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stu0468 avatar image

Which Victron battery charger would be recommended for my 12V Van system?

Hello,


I have 3 x 12V FXH140-12IFR Yuasa batteries in my camper van as a 12V system. They require 13.65V float charge @ 16.46A limit.

Please can you recommend one of the Victron Blue Smart chargers?


Thanks,


Stuart

chargers
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8 Answers
JohnC avatar image

Hi Stu, Might be best to clarify your question a little (well, a lot).

The 16.46A limit is for 'each' of those batts, so your 3x in parallel is now 49.38A. Unsurprisingly, that's a nominal figure for their 164.6Ah (20C) capacity. That 0.1C is typical for a vrla batt to stay safe from boiling off water. But not necessarily cast-in-stone.

In another question you asked, you were considering a 75/15 mppt (15A) and a Multi 12/500 (which can also charge from mains @ 20A).

If you stepped up to a 12/800 Multi, that's now 35A, and a 12/1200 Multi is 50A of charge capacity.

You'd essentially be doubling-up with a separate mains charger. Sure the bigger Multi's cost more, but you also get more inverter grunt. And don't underestimate the value of a bigger inverter.

With respect, best give us the full story..




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stu0468 avatar image

Chaps, the penny finally dropped today.... Like I said I have 3 x 12V 164Ah batteries connected in parallel that need 16ish Amps each to charge.

What I have just realised today is that the most current I can put into my battery system is 16.46Amps and not 16.46Amps x 3 regardless of the number of batteries connected in parallel.

So basically to recharge my battery system will take me 3 times longer than if I only had one battery on the charger.

Sorry to have pestered you all.


Cheers

Stuart

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@stu0468, I stand by my original recommendation, though, as this is what I had understood to be the case from your original post. The IP22 12/15 in 1 or 3 output would still do you well. Slow, but well.

stu0468 avatar image stu0468 Justin Cook - Bay Marine Supply USA ♦ ·

I agree too.

I'm still curious. What's the reason for this (very closely defined) 16.46A limit?


The current limit is what’s recommended by the manufacturer. That’s all.
ive ordered the IP67 blue smart 12/17 charger yesterday. I’ll see how I get on.

That's for 1x batt. 3x paralleled is 3x Amps.

Yes but if I put in 3xamps depending on the internal battery impedance the current won’t be shared equally

Yeh, nor will the loads. So you're going to limit them too?

If you have imbalance at all, even with a slow charge, you'll soon know. They'll fail, given enough time.

The easiest way to test for imbalance is the 'touch test' for temp. The hot one will be the one doing all the work, and may well be the good one.

I'm no fan of paralleled pb's either, but I say you're overthinking this. To design for failure and put yourself out in the meantime seems strange to me.

But I'm not you. I wish you the best with it though..


stu0468 avatar image

Yes but what about the power?

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Do you mean voltage? Or? Charge current is power output... voltage settings are also listed on the datasheet.

Justin Cook - Bay Marine Supply USA avatar image

@stu0468, the output (charge current) is on the datasheet, second line down the chart, labeled "charge current, normal mode"

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stu0468 avatar image

How can I find the power output of a charger? It’s not listed on the data sheet?

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stu0468 avatar image

How would I connect the 3 outputs to a parallel connected battery system?
how can I find the power output of the chargers?

Thanks for your help.

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Well it's available in single-output as well, but the three outputs would just each connect to a battery. The output info is on the datasheet I linked below, or you can just get the info on Victron's website at www.victronenergy.com

Justin Cook - Bay Marine Supply USA avatar image

@stu0468, 230v is out of my area of expertise (I'm in 120v land) but it looks to me as though a Blue Smart IP22 charger in 12v/15A/3 output would work well for you... the float voltage in standard mode is high, but if it's in Li-Ion mode it brings it right down into your acceptable range.

Here's the datasheet:

https://www.victronenergy.com/upload/documents/Datasheet-Blue-Smart-IP22-Charger-180-265-VAC-EN.pdf

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I would say a 15A charger is pretty undersized for a battery bank of 3 x164Ah.

I don't know if there is some confusion, but the 15A 3 Output charger is not 15A per output, it is 15A in total. I don't think getting a 3 Output charger and connecting output to each battery is the best way either. a single output charger connected to the +12V feed point on the Bank makes more sense, as would a charger in the realm of around 50A or at least 30A.

Yes, see above, the OP's system can handle a max total charge current of 16.xxA, thus why I recommended the 15A charger.

Wildebus avatar image Wildebus Justin Cook - Bay Marine Supply USA ♦ ·

Just because the OP has misinterpreted the charging limits of their battery bank (note battery BANK, not battery), it does not mean advice given should further exacerbate that situation.

A 15A charger will work, but it will not not provide a optimum charge for either the user OR the battery manfacturers specifications.

Yes this. As others have pointed out the 16a “limit” is per single battery. Three batteries in parallel will triple that “limit” for charging, or triple the charge time of charging at 16a which is likely to cause issues on the consumption side of things unless most of the capacity is meant as reserve for some reason.

stu0468 avatar image

230volt 50h here Justin

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