Stuart Pittaway

With the existing module design having very short wires to the cells is critical. They must also not share the same wires. You will run into balance and voltage reading...

Hi @Michi202020 pre-charge isn't currently supported in an automatic way by DIYBMS - I simply wired up a push button + high power resistor for the rare occasion I need...

> Is it a big problem 1 timer to used for the delay the second relay. A precharge timer would need some code changes, wouldn't be difficult, but not currently...

When the timer 1 is switched off/on does the voltage of the pack "bounce" so one of the other rules also triggers (like pack under voltage?) which affects relay 2...

Are you using the older (small) controller PCB? The newer one includes a TINY841 programmer through the web interface.

D2 is a SMBJ5.0A TVS DIODE - data sheet https://datasheet.lcsc.com/szlcsc/1912111437_AnBon-SMBJ5-0A_C440263.pdf The STRIPE of the DIODE should be pointing to the RIGHT of the module PCB (towards positive).  D1 is...

Ok, pin 1 aligns with the marking for pin 1 on the silkscreen. D6 is unpopulated (as it should be).

They all have differences, but as long as it has the same 14 pin layout it should be fine

Hi Steen, thanks for the comment - I don't have much experience with the STM range of chips, but know they are popular. There are always trade offs with whatever...

I'm still thinking of a modular approach, but having a "sensor" module per-bank rather than cell, so each would cater for up to 16S cells. Although availability of chips is...