So, I'm fishing
for ideas on the best LifePo4
12v batteries/BMS for my boat
- I'm not looking for "drop-ins" - but, I am NOT interested in doing a complete DIY
build (ie. building battery
packs from cells). AND, they need to fit my existing 8D battery
I want to purchase
two (or maybe three) 12v battery-packs which in total will provide a minimum 600ah capacity. My plan is to install the new batteries
this coming June or July, so I have lots of time.
I am upgrading my boat
which currently has 3 x 8D AGM batteries
mounted in a custom stainless rack. I already have a (new) Victron Multi (12v/3000/120) and a Balmar
large case 200amp alternator
with a MC-614 regulator
(I also have a small 3kw genset). I plan to add a CerboGX/Touch50GX and a Victron BMV-700 (to replace my ancient Link10) as well as new solar panels
1) identify batteries which will fit in my existing battery rack which was designed to hold 3 8D AGM
on their sides - the rack has 3 "slots" - so basically a battery which is no larger than 21" x 11" x 10".
2) identify which BMS to use with those batteries
I have been researching batteries made by Lithionics which offer 2 options which appear suitable (ie. they will fit my rack). The first includes a built-in BMS - but is not a "drop-in" - (I am sure all of you know of it already, it has alternator
field wire connections and a bluetooth app, and a CanBUS port which presumably will allow it to communicate with the CerboGX.
The second uses an external BMS which would be my preference since the one with the built-in BMS is larger and would need to be on its side, which Lithioncs says is not recommended - the external BMS version would fit on the rack standing up which seems better. I think both versions provide the same capabilities in terms of the BMS.
- GTX12V315A-E2107-CS20 (built in BMS)
- GTX12V320A-E2107-DIN-12HK (external BMS)
So, with a pair of (either of) these I would have about 630ah - if "money were no object" I would just buy 3 of these and not bother you kind people with my questions.
But they are sooooo expensive!
Is there another option which will allow me to avoid have to modify the battery rack?
At a minimum, I want to end up with a system which can handle all the possible emergency
scenarios gracefully (ie. LVC, HVC, over-temp, etc., etc) without blowing things up and melting things. Clearly the Lithionics can meet that goal if set up properly - but is there another option besides DIY
battery packs that will cost less?
Thanks in advance for your help!
PS. Yes, I could modify the battery rack to be suitable for a more common size LifePo battery pack, but the cost of that would be literally thousands - I know all the stainless guys in the area and they all charge ridiculous prices. Certainly, if there were an battery option which was low cost enough to justify the cost of rebuilding the rack, I would do it. But I suspect even the most common size, low cost, LifePo batteries plus the cost of the rack rebuild
would be more than just buying
the Lithionics which fit the existing rack. Thus, I really doubt there is a financial argument in favor of rebuilding the rack.