Originally Posted by peterp
Hello Tuskie, most interested in your upgrade, do you have 400 AH in total, and how many batteries have you installed. I am assuming you have the new lithium, if you do was there much of a hassle setting the correct charging
I installed the Lithiums with great assstance from "Dod42", a neighbour and great bloke, even if he owns a Fountaine Pajot
The topic of Lithim batteries on yachts is well covered on this forum if youve got a month to read it.
The 400AH bank, are Winston LiFePO4
in a 2S4P bank of 8 X 200AH cells. These were supplied with connectors and strapped from Trevor at Kuttabul. He can explain why this configuration. This gives as much useable AH as over twice the capacity in lead acid.
The bank is protected from low and high voltages, as well as internal imbalances by a Battery Management System. This was sourced from the US.
CleanPowerAuto LLC – Lithium Battery Management Systems
This BMS shouldn't be confused with a Battery Monitor, sometimes also referred to as a BMS. (Confused? I am!) This monitor is also required. It needs to be reprogrammed for Lithium and my Victron model has a programmable relay that i use to shut off charging from my alterators when bank voltage reaches 14 volts.
This brings us to the biggest hitch when changing over to Lithiums; making sure the charging systems are compatible with the different requirements of these new batteries. On my Lagoon
this wasnt a big issue. My solar MPPT
regulators are programmable, so no worries there. The Cristec battery chargers that were standard on the L400 have a suitable setting for Lithiums, 13.9 v, setting#5, if i remember correctly. The only problems are the engine
alternators that can overcharge. This is where the Victron monior controlled relay is used to shut off the input when 14 volts is reached. When this happens, voltage is sill accepted from the alternators to the engine
start batteries, so no voltage spike.
I can post some photos when i return to the boat after a brief stint away, but there's not much to see. Hope this info helps, but much depends on the individual boat and the type of chargers, regulators, etc. fitted. Cost is effecive when compared with a larger lead acid bank, especially if life span is factored in.