I am putting together a system for running a Epropulsion Evo 6 Outboard, with a 4 x 12V 200Ah Life4PO bank = 48V. Not Victron, 3rd party.
I have two questions specific to the Battery balancer wiring and to the shunt wiring - some bonus questions.
• I want to make sure that I understand correctly that there is a separate wiring loom using 1mm cable for the battery balancer?
So one loom for power and one for the balancer? (The power cable connection between the batteries is 2/0 AWG / 35mm)
• I understand that the shunt connects to the negative into the bank. I have then attached the data cable to the ‘last’ positive. Is this correct?
• Can I connect all directly to terminals or is this bad and should rather us buses?
• Being a beginner, I would greatly appreciate if you can see something done wrong in that diagram?
Batteries can be connected in series (max 4) and they are each rated to a discharging max of 250A. The engine has a max draw of 125A.
You need separate 1mm2 wires for the balancer and 35mm2wires for interconnects as you have shown. Fuse the balancer wires. You can connect to the terminals, balancer lugs on top of the interconnect lugs.
Your shunt is wired correctly.
A Mega fuse may not have a high enough fault rating for your batteries, check the battery max short circuit current. A Class T or MRBF will be better.
Make sure the battery isolator is good for your maximum voltage, some listed as 48V are max 48V, not the 60V required for a 48V lithium set up.
Jan, can you elaborate? Your reply is only helpfull if you back your statement up with what I can do different?
I have done as Victron has described so it would be valuable to hear how you think differently.
So is that setup suggested because it is presumed the batteries wont be able to balance themselves individually?
My understanding was that the added balancer where to take care of per battery imbalance between the four batteries?
thx
I really dont your the reply (and the tone). Every answer in ChatGpt, Perplexity, Google etc states that, even if the Life4PO batteries have internal BMS (which they have), it is advisable to have balancers for the series of batteries. This is also seems logical, but I am very open to structured counter arguments that does not take outset in my lack of knowledge, but rather seeks to answer this specific question.
