When setting the EPsolar Tracer A series using the MT50 you have to go backwards and set your lowest voltages first.
These numbers are for a Li-Ion battery pack of 6 cells in series and a max charge of 25.1V.
You should reference the MT50 instruction pages 17 and 20. Page 20 explains how some settings have to be lower than others or it will not accept your setting values and they don't clearly explain things.
The below works for a new controller that is factory set. If you have messed with the settings you will have to go back to default.
When you try to access the first setting it will ask you to enter the "PSW" (password) which is "000000" all zeros and should be there as a default so simply hit "OK".
When you are at a setting screen like "Boost Charge" you hit "OK" to change a setting and then use the left and right arrows to move the "Cursor", which is the selected (darker) area, and then move to the other setting like "Float Charge".
You will have to change the "Battery Type" to "User" in order to change settings.
Start with "Low Voltage Reconnect Voltage" and set it to 24.4V.
Going backwards we now set "Boost Reconnect" to 24.9V
Then "Float Charge" to 25.0V
Then "Boost Charge" to 25.0V
Then "Equalize Charge" to 25.0V
Then "Over Voltage Reconnect" to 24.9V
Then "Charging Limit" to 25.0V
Then "Over Voltage Disconnect" to 25.1V
Unless you are using the "Load" or the "Light bulb" output of the controller, like a street light or something then the rest of the settings really don't matter.
This controller isn't perfect but for the price it's OK for Li-Ion and MPPT. We have basically disabled Float and EQ by setting them to the top charge voltage of 25.0V .
These charge controllers do not have a separate battery sense input and read the battery voltage from within the charge controller.
This means that when charging or "pushing in" amps to the battery, the wire losses and other factors make the controller see a higher voltage. Thus it will see 25.0V and will back off charge, which lowers the amps, then it sees a lower voltage and will start to charge again.
This happens over and over and you don't see it on the front display. But if it does it long enough the battery will reach 25.0V (in this case 4.16V per cell). If you don't push your batteries hard they will last longer so this is OK.
The reason for 6S cells is that 20V is shutdown voltage on most 24V inverters so you are not taking the batteries too low (3.33V). There is not much energy left in the batteries at that point so no reason to go any lower anyway. People running 7S risk taking cells too low.
Some open source projects I found that read the data via MODBUS:
https://github.com/toggio/PhpEpsolarTracerhttps://github.com/kasbert/epsolar-tracerThere are also modules for C "libmodbus" and for Perl "Protocol::Modbus", use Google.
Tracer4210A Tracer3210A Tracer2210A Tracer1210A Tracer1206A EPever MPPT solar charge controller
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