Hello All
I am just wondering which settings I should use utilizing MK3 dongle to program MultiPlus Compact 12/1600/70 inverter/charger with 4pcs x 40Ah = 160Ah battery bank consists of 4pcs of batteries:
https://shop.gwl.eu/LiFeYPO4-batteries-12V-1-1/Lithium-Battery-12V-40Ah-WB-LP12V40AH.html#tab1
Batteries came from here, but are the same as above:
https://lime-power.se/sv/produkter/batterier/litiumbatteri-40-ah.html
Thanks a bunch for advise!
/Tim
Assuming you run these in parallel, all settings are listed in the short manual which is available for download on the website you mention:
Operating voltage min 11.5 V - max 15.5 V At 80 % DOD
Deep discharge voltage 11 V The cells are damaged if voltage drops below this level
Maximal charge voltage 16 V The cells are damaged if voltage exceeds this level
Optimal charge current < 20 A 0.5 C
Maximal charge current < 120 A < 3 C with battery temperature monitoring
Without a BMS it is very important to be able to manually monitor cell voltages. So you want access to individual cells terminals (to be able to measure each cell and take measures, if necessary). I don't see the point of using enclosed cells without also a BMS inside the battery enclosure. All cells should be bottom balanced when used without a BMS.
With LiFePO4, when charging don't go over 3.6V (cell voltage).
But since those have no BMS, keep it even lower: something like 3.45V.
For discharging, set the inverter low voltage cut off no lower than 3V (cell voltage).
Keep in mind that cells in a battery can have different voltages. So for instance a 4-cell battery with a voltage of 12V does not necesarilly mean that all cells inside have 3V. Some could be higher and some could be lower than 3V.
