We have sold one made by Redarc for the last five years or so.  They are
quality products, made in Australia and the tech support and product
support is great.  Here is a link to the one that we sell.  If I was doing
a lithium battery upgrade, this is really the only way to go.

https://www.vanagain.com/product/dual-input-25a-in-vehicle-dc-battery-charger

Ken

On Fri, Jun 21, 2024 at 9:48 AM John T <john.thiessen@gmail.com> wrote:

> I ordered one a few days ago. Much less expensive when ordered
> directly from Renogy.
>
> It also acts as an isolator between the batteries, and has an
> interesting feature
> where you can toggle the maximum charging current by half (potentially
> useful with Lithium batteries).
>
> J
>
>
> On Wed, Jun 19, 2024 at 10:45 AM Mark McCulley <mark@markmcculley.com>
> wrote:
> >
> > This looks like an interesting device, would allow the alternator to
> properly charge AGM batteries.
> >
> > -Mark
> >
> > > On Jun 18, 2024, at 7:47 AM, Jack R <jack007@COMCAST.NET> wrote:
> > >
> > > Has anyone installed a DC to DC battery charger for the AUX battery?
> > >
> > > This allows you to charge off the starter battery/alternator to the
> AUX (any
> > > battery type).
> > >
> > > Seems like the way to go.
> > >
> > > https://tinyurl.com/4pwmmyyh
> > >
> > >
> > >
> > > Jack R.
>

-- 
Thanks,
Ken Wilford
John 3:16
www.vanagain.com