Bill, we actually sell the Redarc and have used them in a Vanagon
application.  I would recommend the 25 amp version because of the output of
the alternator, it really doesn't have enough extra capacity to do more
than 22 amps anyway.  So you could buy the 40 amp version, but you really
wouldn't get any extra benefit out of it with the stock waterboxer
alternator.

The Redarc is an amazing device.  It is smart so it maintains the battery
correctly, and will also act as a solar controller, and a battery
isolator.  All of these in one unit that is very well made in Australia.  I
highly recommend it if you are going down the Lithium battery path.

Here is a link to it on our site:
https://www.vanagain.com/shop/dual-input-25a-in-vehicle-dc-battery-charger

On Wed, Apr 29, 2020 at 6:59 AM Bill Berg <overthehillbill@gmail.com> wrote:

> Anyone on here familiar withe RedArc battery charger /solar controller ?
> Considering it to charge 100ah Lithium house battery and trying to decide
> between 25 or 40 amp models. Anyone have experience with these? Just want
> to make sure I don't go to high on amperage and overheat the alternator .
> Currently running a 90 amp alternator with no unusual loads over stock
> Vanagon.radio and interior lights and usb all on house battery and
> eventually a all electric fridge.
>
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--
Thanks,
Ken Wilford
John 3:16
www.vanagain.com