The EEPROM is 24AA01?

Charge Controllers
1

it is the MPPT 20A,i use 24AA01.but output:EEPROM: Buffer too small or data layout version changed
thank you.

2

The serial output is maybe a bit misleading, but it should be fine. It means that the EEPROM is still empty. You can wait 6 hours (that’s the interval the charge controller stores the values to EEPROM) or send !exec "SaveSettings" via serial interface to trigger an EEPROM storage manually. After a reset it should then read the stored values from EEPROM.

3

I wail over 6 hours. After a reset, output:EEPROM:CRC of data not correct, expected 0x725fe5e0 (data_len = 213)
thank you!

4

If you took the most recent firmware, there might be an issues because I renamed the PCB types according to a new standard. Just found that it wasn’t updated correctly in eeprom.cpp.

Please check if it works if you replace

#ifdef PCB_LS_010

by

#ifdef MPPT_2420_LC_0V10

in line 75 in eeprom.cpp.

If it doesn’t work, can you switch on some of the printf statements in that file and give some more debug information?

5

And you don’t have to wait 6 hours. Sending the command as described does the same and you see the result immediately.

6

Take a look at the latest commit. The EEPROM error should be fixed if you populated the PCB with the 24AA32. Unfortunately there is a mismatch between the name in the schematic and the part number in the BOM. If you used the 24AA01, please adjust src/pcbs/mppt_2420_lc_0v10.h.