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24V 8S LiFePO4
24V 8S LiFePO4
NOMINAL VOLTAGE IS 25.6V
FULLY CHARGED IS 29.2V
FULLY DISCHARGED IS 20V
Lithium batteries should not be float charged. There's no need and will lead to overcharging and harm to the battery. When the battery drops to a set voltage it should kick into bulk charge and then shut off at your full SOC point, no "float". (source: SolarRat)
Here is what Battleborn says: "We recommend a bulk and absorption voltage of 14.4V. A float is unnecessary, since Li-ion batteries do not leak charge, but a floating voltage under 13.6V is fine." In other words, if you can't disable the float stage set it low enough to not turn on. (source: SolarRat)
180 3.2V LiFePO4 cells = 12.8v x 90 AH, $3.61
LiFePO4 charge profile: Relion
Battery Class - Lithium Ion
Battery Chemistry - LiFePO4 - Lithium Iron Phosphate
(also called LFP - Lithium FerroPhosphate)
Rated Capacity - 12.8V / 90Ah / 1152Wh - How we Measure
Cycle Life - 3500+ & 100% DoD
Weight - 21 Pounds
Dimensions - 10.2 X 6.6 X 8.8 Inches
Max Charge Rate - 100A
Operation Temperature - -4 to 131 ºF
Charge Temperature - 32 to 113 ºF
Warranty - Limited Lifetime (see manual)
Per Katie from lion Energy ' Additionally, the Safari UT-1200 has an internal Battery Management System (BMS) that acts as a safety net to shut down the battery if it is out of parameters, this prevents the battery from overcharging or discharging as well as operating outside of the temperature range. Yes, the low voltage cutoff is 10V - once the batteries reach 10V the BMS steps in and shuts the battery down to not permanently damage the internal battery cells. Also, the battery does have a low/high temperature cutoff which are provided below.
Charging Temperatures : 32~113°F
Discharging Temperatures: -4 ~ 131°F"
https://www.loveyourrv.com/battery-review-lion-energy-safari-ut/
https://diysolarforum.com/threads/lion-energy-safari-ut-safety-mode-is-a-pain.424/#post-3235
- Press the power button on the top of the battery (only button on the battery) for less than a second, and wait till the SOC battery capacity LED lights turn on.
- Press and hold down the button a second time until the battery capacity lights turn OFF.
- Test voltage of battery with a volt meter. You will know the battery is out of the "safety mode" when you have a voltage of 10-14.4 volts.
MPP Solar settings per DIY Solar Forum
(01) Output Source Priority - SBU
(05) Solar Supply Priority - LBU
(06) Overload bypass - BYE
(10) Charger Source Priority - CSO (I've tried SNU as well)
(14) Battery Type - USE
(17) Bulk Charging Voltage - 29.2 volts- Per Lion Energy's Guidance
(18) Float Charge - 29.2 Per Lion Energy
(19) Low DC Cutoff - 22 Volts Per Lion Energy
(20) Battery Stop discharging Voltage when Grid is Available - 22 Volts
(21) Battery Stop Charging Voltage when Grid is Available - FULL
DIY Battery Packs
DIY Battery Packs
4/3/2/1x 18650 14.8/11.1/3.7V Plastic Battery Holder Box Case With Cable Wire (eBay)
- I purchased 5 - 3 bay (in series) battery Cases with wire for $19.95 - $1.40 (qty discount) + $1.48 tax = $20.03 (seller is: worth-collect-de)
- I can put 3 in Parallel to charge 9 batteries from Solar Panel.
Battery Management System (BMS)
Battery Management System (BMS)
Used to manage lithium battery packs.
Battery Tender 022-0165-Dl-Wh 12-Volt 2-Bank BMS (ebay)
- Match number of cells in battery and voltage exactly (cannot use 10 cell BMS with 7 cell battery). When BMS does not recognize correct voltage, will not allow battery to supply current.
- Use right BMS current rating (e.g., 15A BMS for a 15A controller). BMS can be rated higher.
DIY Lithium Battery - BMS Wiring - Part ⅗
4S 12V 3.7V Li-ion LiPo 3.2V LiFePo4 LFP Lithium Battery BMS Board IP65 WBalance (eBay $12)
Suppliers
Suppliers
rj-lithium.com (discussed on thread)
Lifepo4 100ah 200ah 300ah 400ah 12V Lithium ion Battery (Amazon 400ah $1500)
LiitoKala Lii-500 18650 Smart Li-ion NiMH Battery Charger LCD Display (eBay $25.11)
https://www.techdirectclub.com/
VTE Warehouse - Bus bars, power posts, terminals, fuses and holders, insulators
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