I don't have ammeter, yet, on main lead from alternator so I can't say what max current I see. Mind you I doubt I'd ver see as much as 65 A. I don't let the aux battery become deeply discharged ( have solar panels).

And assuming the alternator can put out 90 A, when hot, pulling 65 thru to the aux leaves 25A for the rest of the van. It seems very much like an outlier situation.

The one thing about the blue seas acr which does give me pause is the max current  allowed during forced combine. As in the starting battery is dead and you want to use aux to start van. I haven't had to try it but I wouldn't want to crank more than a few seconds.

Alistair

> On Jul 4, 2017, at 2:51 PM, Karl <tdiguru@westyventures.com> wrote:
> 
> Because almost all later Vanagon alternators can put out 90A, and converted ones as much as 130A. Granted that isn't usually what the battery is seeing - unless deeply discharged.
> 
> 
>> On 7/4/2017 2:37 PM, Alistair Bell wrote:
>> Karl,
>> Just out of curiosity, why do you consider 65A continuous to be undersized ?
>> I have the older version of the blue seas acr, been working great for me for must be at least 15 years. Never found the current rating a limit.