I will take a small issue with BFL. Yes, each brand of converter PD, IOTA, PowerMax, et cetera has its own fan club, but the only members of the WFCO fan club are builders that want a cheap product that will probably get them through warranty.
Pitch the WFCO. If you have somebody test it completely and it seems good, put long cables and tie on a handle and use it to charge lawnmower batteries.
Get a three or four stage charger and put it in per the included instructions and you will never regret the expense.
This is what I did regularly for the owners of expensive boats before the depression and I did learn a lot.
Matt