If they are bottom balanced properly, they should be nearly the same voltage when nearly depleted. Discharge again and watch the balance of the cells. When the battery is nearly depleted, balance the cells. Slowly discharge the cells to 5-10% capacity while watching the balance of the cells. Bottom Balancing the Cells: This is REQUIRED when first building a LiFePO4 battery.But you can add a battery cooling system if you wish. So typically, this is not a big deal at all. For solar power systems, lithium batteries rarely need a cooling system. High Temperature Protection: If your system will be in high temperature environment, or discharging at high c ratings that its not designed for, you will need a battery cell cooling system.You can build your own relay system, or simply buy a "Victron Battery Protect" (click here) and program the low voltage disconnect for your battery (more on this soon). To ensure that this never happens, the battery should be able to disconnect itself from the loads of your system if it is discharged too low. Over-Discharge Protection System: If you over-discharge a lithium battery, it will change the chemistry of the battery and permanently damage it, and it will be unsafe to charge again.(more information on this at the bottom of the page) If you want added protection, and increased longevity, charge to 13.3 volts, and set the float to 13.2 volts. This will prevent charging over 14.4-14.6 volts and works great. MPPT Charge Controller Capable of Charge Profile Editing: Each lithium battery will require a different max charge voltage. For a 4 or 8 cell LiFePo4 battery (12v/24v) with new healthy cells, we can use the standard "sealed lead acid" setting on our solar charge controller.This is the best way for a beginner to do this! It costs a little bit, but it takes seconds to program and anyone can do it. The easiest way to build a low temp cut off is to buy the victron charge controller mentioned in the parts list of this page, and buy the battery temperature sensor from victron. I am keeping my battery in my living area so it stays nice and warm during the winter. Try to find a solar charge controller with low temperature cut-off, or build your own thermostat controlled heater pad to keep the battery warm. If it is charged below this temperature, it will be permanently damaged and will be unsafe to charge. Low Temperature Cut-off or Heating System: Lithium batteries can NOT be charged when the internal cell temperature is below 0 degrees Celsius.BWB LiFePO4 Batteries are so Tough and Strong, that they will accompany you and your family to enjoy a relaxing time.There are 6 crucial things that you need if you plan to use a custom built lithium iron phosphate battery: In this way, the battery is built for performance in a harsh environment related to 4WD and boating. The cells are covered by foam on both sides as well as the bottom to help with vibration and external heat. Apart from that, we also use double coated 3M foam tape between every cell for shock absorption, fiberglass tape to keep the cells together, and high-quality epoxy resin boards as the insulation board. GREAT COMBO SPECIAL OFFER now available for all our BWB LiFePO4 Batteries!įor our BWB LiFePO4 Batteries, we only use A-Grade GFB Prismatic cells and DALY BMS. Know more about BWB 12V/24V LiFePO4 Battery components: Can run 2000W microwave, TV, Electronic Devices, Fridge, and more!.
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