There is a very small risk, e.g. if your communications card is marginal, it's possible to start the reflash process and have it fail before it reaches the end. You can try again no problem, but if your communications card is very unreliable, you may never get there. In that case, you'd need a new communications card, which could take a lot of time to arrive, and meanwhile you have no power.
The main one is that the "tail current", the current below which the charger switches to float setting, is based on this setting. If you make the setting too low, your battery could spend too long in absorb mode, shortening its life slightly. The other connection I can think of is only in patched firmware. The KettleKomp™ feature (internal resistance compensation) estimates the internal resistance of the battery in part from this setting. Larger batteries tend to have larger values for this setting, and those larger batteries tend to have lower internal resistance.Could you please explain which differences?It makes subtle differences, even if you don't have enough charging power to get past 70A.
If you have no utility power, then no, I don't think so. When the warning is showing, the battery is deemed "weak", which affects which modes it switches to, but without utility, you will only ever be in battery mode (or utility mode if you plug in a generator).Is there any problem if warning 04 is going on, apart of the annoying beep that anyway can be muted?
You don't need a special command to turn the charger on; it will wake the inverter at sunrise, even if the power switch is off.I also wanted to follow another route: as the BMS of the Pylons will give me SOC, with a little device like an ESP32 or similar get the info from the cons or rs485 port of the master battery and either shut off the inverter (but then how to turn it on, as I could not find such a command,
The problem is if you turn the power switch off to shut up the noise and/or to prevent the battery from discharging ever further. You will need the power switch on to allow the inverter to power the loads. It's probably best to ensure that the battery never gets too discharged, so that you can just let it run all night in fault mode. Next day it should start up normally with no intervention.
It won't attempt to go to line mode (where the AC-in powers the loads directly) if no AC-in is detected.or to force the inverter use the AC input (if it is possible as I have no AC input and maybe the inverter refuses to switch it)
Your idea is still sound. You can have a small computer talk say RS-485 to the battery's BMS, and when the SOC falls to a particular value, you can have the small computer send a command to the inverter to change the cut-off voltage so that the inverter shuts down with fault code 04. There may be a more elegant way that I can't think of at present. In the morning when the SOC has recovered enough, you can get it to send another command to set the cut-off voltage very low again. That should trigger normal operation.