Hi Captain Canuck,
You are headed in the right direction with your plans. If you are planning to use lithium it's probably a good idea to use a BMS (battery management system) so you don't run the batteries down too low or charge them too high. When I repowered my 1976 Ericson 27 with electric I hoped the AGM batteries that I used would last 5 or 6 years. At that point I thought I would replace to batteries with lithium. I have yet to make the change (6 + years) but I'm in the process. I didn't see any mention of instruments (I may have missed it). A voltage reading for each battery (down below) and an ammeter/voltmeter at the helm are pretty much must-haves. It's amazing how a very small adjustment in throttle position can lower your current consumption and keep you moving at the same speed. Also the ammeter at the helm is critical for regeneration. I started a description of my system on the Ericson Yachts web site, I need to update it but it may be helpful Ep - Blogs - EY.o Information Exchange
You are headed in the right direction with your plans. If you are planning to use lithium it's probably a good idea to use a BMS (battery management system) so you don't run the batteries down too low or charge them too high. When I repowered my 1976 Ericson 27 with electric I hoped the AGM batteries that I used would last 5 or 6 years. At that point I thought I would replace to batteries with lithium. I have yet to make the change (6 + years) but I'm in the process. I didn't see any mention of instruments (I may have missed it). A voltage reading for each battery (down below) and an ammeter/voltmeter at the helm are pretty much must-haves. It's amazing how a very small adjustment in throttle position can lower your current consumption and keep you moving at the same speed. Also the ammeter at the helm is critical for regeneration. I started a description of my system on the Ericson Yachts web site, I need to update it but it may be helpful Ep - Blogs - EY.o Information Exchange
