Thanks, Uni - I'm finally getting around to doing this and your suggestion pretty much aligns with the schematic in the FNDC manual. However, to do it right I'd have to add another shunt to account for a few small DC loads I have attached to my negative bus. This would require a somewhat major rewiring of my PSDC cabinet which I'm loathe to do right now...
All that said, can you look at the attached schematic and tell me what the downside of wiring it as shown would be? In this setup, shunt A would measure ALL battery current, while shunt B would measure charge controller current only. Will the FNDC still work properly in this setup, or does it expect the sum of all shunt currents to equal total battery current (not the case in my proposed setup)?
Any other opinions out there would be welcome as well! Thanks all.
PS the FM80 charge controller shown is new as well, forgot to mark it as such before taking the photo.