Truck off grid
Bob!
Do you need to add a bms system to a lithium iron phosphate batery bank x4 -12v. ?
Bms needed with 4 lithium iron phosphate batteries
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Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
Short Answer YES. If you want to manage and balance the cells for longevity & fail safe protection then a BMS is needed.
Clarification of terms. a 12V Battery Pack consists of 4 cells of 3.2V. A Battery Pack is a single "Battery". A Battery Bank is a set of battery packs set up to work together as one power source.
Clarification of terms. a 12V Battery Pack consists of 4 cells of 3.2V. A Battery Pack is a single "Battery". A Battery Bank is a set of battery packs set up to work together as one power source.
iceledoar
Off Grid, Off Grid. Not even sometimes.
Truck off grid
Bob!
Thank you for the proper language and the needs of a bms . What would you recommend?
Truck off grid
Bob!
I did see his video I'll have to watch again . What brand would you use and is it true it's not good to have more than 4 lithium in parallel
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
There re MANY opinions on this and most of it comes from back in the Lead Acid era, where that is very true. Lithium is NOT Lead and deals with things differently. A properly wired Parallel system can be very large with multiple packs, allowing for fail over and more. People forget that Diesel Electric Submarines have Honking Huge Battery Packs and they are paralleled and safetied to the inth degree, they also evolved out of Lead for obvious reasons.
Again, the best guide to wiring up your battery systems is the Victron Document here: https://www.victronenergy.com/upload/documents/Wiring-Unlimited-EN.pdf
As for recommending a BMS, that depends on what you want / need and would like to have it do. There are a LOT with various features, functions and capabilities and of course price reflects that. I play with heavier stuff (Chargery BMS') which use external relays and do a lot of things, so not that cheap. Many here are playing with a few different GOOD BMS' many of which have Bluetooth and an app to configure, adjust and tweak and allow for monitoring of what is going on inside the pack. These are FET Based and therefore MUST be handled with care as well... When they say they are rated for 100A, that IS the edge of their performance limit, you really would not want to pull more than 80A from one, if you want 100A from the Battery Pack, then you should get a 120A BMS or higher so there is margin. I cannot advise as to which because I have not used these, they do not suit my purpose & configuration.
Truck off grid
Bob!
I understand completely on this return reply. I'm only interested in what was best for longevity for just the 4 lithium . I don't want to get crazy involved with much, but a app ready unit could be useful . I'm not needing expensive . The relay set up sounds interesting . Where can I read and look at some of the b m s system brands .
Truck off grid
Bob!
Do renogy lithium iron phosphate batteries need a bms if they have a built in already? They aren't the smart battery.
Truck off grid
Bob!
Hello P. Do renogy lithium iron phosphate batteries need a bms if one is built into itself alone ? They are not the smart battery.
Truck off grid
Bob!
Hello Even if the battery is to have a built in bms in each already?
No.
Why would you need two BMS on one battery?
Everyone assumed that you were asking about making your own battery from 4 individual cells then adding a BMS and not buying 4 name brand drop in batteries like a Renogy.
No
Lithium-Iron Phosphate Battery 12 Volt 100Ah
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www.renogy.com
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Truck off grid
Bob!
It's the battires own built in bms . I was wondering if a external bms was needed but I'm told no
Truck off grid
Bob!
My firs post I dint see the built in bms on the renogy battery. Only asking and more searching and giving brand name did you solve . Sorry and thanks for your brain
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