backchannel: Renogy DCC50S mppt is useless

from this discussion Note:  the PV input max on the unit really is 25v;  that is not disputed. ALSO… it only has a 25V MAXIMUM solar input… which means the MPPT is useless on this thing. Bold claim.   Let’s see where this goes. 

backchannel: DC-DC charging myths

Outbackjoe’s info is excellent.  Here I will address some of his points about what he calls DC-DC charging myths.  The most commonly reported myth is that your alternator cannot fully charge a battery. It can, given enough voltage and enough time, as on a powered cruiser (boat), that spends many hours a day running the

backchannel: adding DC-DC charging to solar

inspired by this thread on the promaster forum, in which OP was thinking about what DC-DC charger to add to a 300Ah bank and 30A of solar charging. The DC-DC charger will be a back up to solar charging. Devil’s advocate proposition:   when combined with nontrivial amounts of solar,  DC-DC charging is a decreasing

on the CTEK D250S charger and smartpass

The CTEK D250S-series charger is probably the most popular DC-DC (boosting) charger for vandwellers.  There are several reasons for this, I think: it is a clean looking and simply labeled. it really does do DC-DC charging from the alternator it supports 12v nominal solar panels In practice there are a few issues with this.