Lithium Ion Rechargeable Cells,lifepo4 Rechargeable
The Li-Ion chemistry chosen for this financial institution known as lithium ferrous phosphate, LiFePO4 or LFP for short. There are a few variations on this chemistry such as LiFeMnPO4 & LiFeYPO4 however the end result continues to be primarily an LFP bank that has the same inherently secure characteristics. For this build I chose four 400Ah Winston LFP prismatic cells, and the bank is set up in a 4S or 4 sequence cells configuration. Lithium-ion batteries are widespread in moveable client electronics due to their excessive power-to-weight ratios, lack of memory effect, and slow self-discharge when not in use.
After months of constructing these batteries, I highly recommend spending the additional cash for a Victron controller. It has low temp charging disconnect built in and it takes literally seconds to program customized cost profiles. I at all times found that programming low cost controllers was probably the most irritating a part of building these custom lifepo4 batteries.
For example, in most UPS (uninterruptible power supply) lead acid batteries have a cycle life and last between three-5 years. This LiFePO4 battery has a cycle life of two,000-three,000 and would last years in the same scenario. The transitions within the automotive industry away from internal combustion engine autos and in energy markets away from fossil fuels are nicely underway. Both shifts rely on lithium-ion batteries making further progress on costs, vitality density, and cycle life.
Alternatively, one can use use a DC to DC charger, such because the Sterling Power Battery to Battery Chargers, to charge the LFP bank from the lead acid battery. The Sterling Power battery to battery chargers are designed to deal with a BMS load dump. The image beneath is a main instance of how boat homeowners, without sufficient knowledge, can get burned shopping for LiFePO4 batteries.
A 300Ah 8D format drop-in, like the one addressed under, can really solely deal with a 50A (0.17C) charge and a 100A (zero.33C) discharge. When unsure with FET based BMS methods smaller batteries in parallel are a better solution than one large battery with a low present rated BMS. Whether or not a drop-in batteries are properly suited for your use will depend upon many elements.
More controller choices for bigger techniques or larger voltage packs can be found by clicking here. The two main advantages of this LiFePO4 battery over sealed lead acid batteries are the significant discount in weight and excessive (10x or extra) improve in cycle life.
We have been consulted by an owner who purchased a 300A drop-in battery from a “reputable manufacturer“. During the transaction, he had no session with the producer and no questions have been requested by the re-seller.
Whether or not a drop-in batteries is properly suited on your use will rely upon many elements. #2 Internal BMS contactors / switches capable of handling the amperage’s discovered on cruising boats. A 50A steady score on a 300Ah LFP battery is just unacceptable.
He just ordered it primarily based on it’s 8D format, the declare that it was an actual drop-in substitute for his lead acid 8D battery, and the 300Ah capability rating. When it comes to FET based mostly BMS batteries we always advise smaller particular person batteries, in parallel, to share the load throughout the FET primarily based BMS’s. For instance three 100Ah 1C rated LFP drop-ins can theoretically deal with a 300A discharge, if the parallel wiring is ideal and all batteries share the load equally.