Controller puzzle - Float for LFP on solar (long post)
Preamble - for those who are interested. I'm trying to set EPEVER MPPT controller for LFP battery. Custom charging profile for LFP requires connecting laptop with proprietary cable (not included) and downloading and installing EPEVER software. Procured the cable, installed the software, controller is not recognized. Software Read-me and Help files are in horrible Chinglish. I am not new to controllers but had to read each phrase several times, comparing to interface screens and buttons, going back and forth again and again before could understand what they meant. Had to dig into Win 10 Control Panel and change Port COM number, delete ports, add ports, delete and create custom profile 10 or 12 times, uninstalled and re-installed the entire software a few times - after 5 or 6 hours it works now.
Battery specs:
charge Full to 14.2V, set Absorption to 0-10 minutes, avoid Float or set Float as low as possible 12.8-13.6V.
BMS: LVD= 10V, HVD= 14.6V.
Objective: keeping battery being charged all the time unless it's Full, because this is solar, North Pacific - sun today, gone tomorrow.
Can't set Float to lower than 12.9V.
Custom charging profile that I've set:
Charging limit: 14.2
Over voltage disconnect: 14.4 (why do I even need this when charging stops at 14.2?)
Over voltage reconnect: 14.2 (don't ask me what this is)
Equalize: 14.2V, duration 0.
Boost charging (aka Absorption start): 14.2V, duration 10 minutes (thinking changing to 5 minutes)
Float: 12.9 (can't be set below Boost Reconnect)
Boost Reconnect: 12.8
Low voltage reconnect: 12.7
Under voltage warning reconnect: 12.7 (don't ask me what this is)
LVD: 12.6
Discharging limit: 12.6 (why do I need this when LVD= 12.6?)
As said, Float can't be set below Boost Reconnect, and there are other mandatory relations, ex. LVD>= BMS LVD+0.2, OVD> BMS OVD+0.2 (not sure about the latter, could be a typo). Complete list of requirements below (pain in the ars, told ya :). PCM means BMS, but other than that, controller manual is in good English. Software is not.
I. Over Voltage Disconnect Voltage > Over charging protection voltage(Protection Circuit Modules(PCM))+0.2V;
II. Over Voltage Disconnect Voltage>Over Voltage Reconnect Voltage=Charging Limit Voltage >= Equalize Charging Voltage=Boost Charging Voltage >= Float Charging Voltage>Boost Reconnect Charging Voltage;
III. Low Voltage Reconnect Voltage > Low Voltage Disconnect Voltage >= Discharging Limit Voltage;
IV. Under Voltage Warning Reconnect Voltage > Under Voltage Warning Voltage >= Discharging Limit Voltage;
V. Boost Reconnect Charging voltage > Low Voltage Disconnect Voltage;
VI. Low Voltage Disconnect Voltage >= Over discharging protection voltage (PCM)+0.2V
Battery specs:
charge Full to 14.2V, set Absorption to 0-10 minutes, avoid Float or set Float as low as possible 12.8-13.6V.
BMS: LVD= 10V, HVD= 14.6V.
Objective: keeping battery being charged all the time unless it's Full, because this is solar, North Pacific - sun today, gone tomorrow.
Can't set Float to lower than 12.9V.
Custom charging profile that I've set:
Charging limit: 14.2
Over voltage disconnect: 14.4 (why do I even need this when charging stops at 14.2?)
Over voltage reconnect: 14.2 (don't ask me what this is)
Equalize: 14.2V, duration 0.
Boost charging (aka Absorption start): 14.2V, duration 10 minutes (thinking changing to 5 minutes)
Float: 12.9 (can't be set below Boost Reconnect)
Boost Reconnect: 12.8
Low voltage reconnect: 12.7
Under voltage warning reconnect: 12.7 (don't ask me what this is)
LVD: 12.6
Discharging limit: 12.6 (why do I need this when LVD= 12.6?)
As said, Float can't be set below Boost Reconnect, and there are other mandatory relations, ex. LVD>= BMS LVD+0.2, OVD> BMS OVD+0.2 (not sure about the latter, could be a typo). Complete list of requirements below (pain in the ars, told ya :). PCM means BMS, but other than that, controller manual is in good English. Software is not.
I. Over Voltage Disconnect Voltage > Over charging protection voltage(Protection Circuit Modules(PCM))+0.2V;
II. Over Voltage Disconnect Voltage>Over Voltage Reconnect Voltage=Charging Limit Voltage >= Equalize Charging Voltage=Boost Charging Voltage >= Float Charging Voltage>Boost Reconnect Charging Voltage;
III. Low Voltage Reconnect Voltage > Low Voltage Disconnect Voltage >= Discharging Limit Voltage;
IV. Under Voltage Warning Reconnect Voltage > Under Voltage Warning Voltage >= Discharging Limit Voltage;
V. Boost Reconnect Charging voltage > Low Voltage Disconnect Voltage;
VI. Low Voltage Disconnect Voltage >= Over discharging protection voltage (PCM)+0.2V
