The BMS safety switching , as discussed above, is usually rated at a ridiculously low steady amperage functionality of round 50A and maybe as high as 100A, if you’re lucky. The drop-in producers are essentially relying on you paralleling multiple batteries collectively, and sharing the load across a number of BMS switches. Depending upon your specific expected use this will wind up being an under-engineered BMS swap. The BMS used in this battery is definitely FET based but it is made right here in the USA, of Mil-Spec components, and is designed to handle starting engines. Not all drop-in batteries use cylindrical cells nevertheless and a main example is the Lithionics Group Ah drop-in.

It did a couple of thousand in damage to the boat, and his satisfaction, but it could have been a lot worse. The owner had zero warning the battery was about to disconnect itself before he lost propulsion power, while going under a bridge. Drop-in batteries must also have temperature protection, for every three.2V cell, but many don’t.

A 50A steady score on a 300Ah LFP battery is simply unacceptable. 1C steady charge or discharge current can be where to begin in search of a battery with a sealed BMS or a BMS/battery that is capable of engine cranking .

I appreciate that Trojan has developed a “drop-in” LFP battery that options some stage of external communication . #2 Internal BMS contactors / switches capable of handling the amperage’s discovered on cruising boats.

Drop-In Lithium-Ion – If the interior BMS is sealed, and the battery can’t inform an exterior cost supply when to stop charging or a load to cease discharging, then that is considered a drop-in battery. Whether or not a drop-in batteries is well suited in your use will depend on many factors. The batteries are utilizing cylindrical LiFePO4 cells and the batteries, only the group 24 version initially, will have the ability to talk externally utilizing the CAN-bus protocol.

1) The sealed inside BMS’s in most drop-in batteries don’t have lots of steadiness current to work with, usually mA level currents for balancing. We have even seen some BMS specs suggesting they'll solely stability the cells at as much as 0.05A. #6 Series Wired System – In a parallel wired financial institution one battery BMS dropping out only creates issues when it re-engages into a special SOC than the rest of the bank. With a collection bank (or a single drop-in LFP battery) one batteries BMS taking itself off-line spells catastrophe at sea. I know one Alixxxxxx purchaser who hit a bridge abutment in his electric boat using a 48V collection bank of drop-in batteries.