Here are my needs:
I plan to have four 200ah LifePO4 battery banks in parallel to get to 800 ah total. Each bank will need a BMS (48v 16s). I need to pull up to 100a from each of the banks at maximum load, so a draw of 400a, continuous, at times due to two electric pod propulsion motors. I don't want to pull more than 50% of the rated maximum on each BMS. Therefore, I need the BMS units rated for 200a, minimum. I will sail in cold climates, on occasion, so I need a low temperature cut off feature on the BMS units. I have a Victron system, and would like the BMS units to communicate with the Inverters. Here is the kicker, I don't want to spend nearly as much on the BMS units as it costs to buy the batteries they are protecting!
NOTE: To get the price of the BMS units down, If I had to, I would give up on the Victron communication, but not the rest of my requirements.
Each of my battery banks cost about $1,500 to build (without the BMS). All total, that's about $6,000 for the batteries.
I found the REC BMS system which fits all my needs, except for the price, which is atrocious at $1,100 per bank. By the time you get all the parts you need (slaves, master, several contractors, etc) I would spend $5,000 on the BMS system. That makes their BMS too expensive to protect $6,000 worth of batteries!
Are there any 48v 16s BMS units, rated to 200a, with low temp cut off, that anyone knows of that will do what I need and yet don't run $1,250 per bank? I would hope to spend $250 per BMS, but I may be dreaming. I certainly don't want to spend well over $1,000 per BMS.
Daly are at the right price, but the large ones have no low temp cut off (that I know of). Overkill are nice, and available at a great price, but max out at 100a. Batrium are even more expensive than REC (as are several others). QUCC are cheap, but have a single contactor built in, so it cuts off the batteries completely when it trips. That means, once it cuts off from, say, low power due to over draw, the BMS won't allow the batteries to charge while the contactor is tripped. Argh. Does anyone here have a different suggestion for a BMS that fits my needs? Help?
I plan to have four 200ah LifePO4 battery banks in parallel to get to 800 ah total. Each bank will need a BMS (48v 16s). I need to pull up to 100a from each of the banks at maximum load, so a draw of 400a, continuous, at times due to two electric pod propulsion motors. I don't want to pull more than 50% of the rated maximum on each BMS. Therefore, I need the BMS units rated for 200a, minimum. I will sail in cold climates, on occasion, so I need a low temperature cut off feature on the BMS units. I have a Victron system, and would like the BMS units to communicate with the Inverters. Here is the kicker, I don't want to spend nearly as much on the BMS units as it costs to buy the batteries they are protecting!
NOTE: To get the price of the BMS units down, If I had to, I would give up on the Victron communication, but not the rest of my requirements.
Each of my battery banks cost about $1,500 to build (without the BMS). All total, that's about $6,000 for the batteries.
I found the REC BMS system which fits all my needs, except for the price, which is atrocious at $1,100 per bank. By the time you get all the parts you need (slaves, master, several contractors, etc) I would spend $5,000 on the BMS system. That makes their BMS too expensive to protect $6,000 worth of batteries!
Are there any 48v 16s BMS units, rated to 200a, with low temp cut off, that anyone knows of that will do what I need and yet don't run $1,250 per bank? I would hope to spend $250 per BMS, but I may be dreaming. I certainly don't want to spend well over $1,000 per BMS.
Daly are at the right price, but the large ones have no low temp cut off (that I know of). Overkill are nice, and available at a great price, but max out at 100a. Batrium are even more expensive than REC (as are several others). QUCC are cheap, but have a single contactor built in, so it cuts off the batteries completely when it trips. That means, once it cuts off from, say, low power due to over draw, the BMS won't allow the batteries to charge while the contactor is tripped. Argh. Does anyone here have a different suggestion for a BMS that fits my needs? Help?