I would like to see that lower voltage pull up to above 3.4V in the next week or two. Keep an eye on it. The higher end also seems to be tapering down a bit, which is good.
This “algorithm” is really bleedingly simple. The BMS itself could do something similar, and better, since it has direct access to the data… not like me who gets an update once a second or so.
I wish you could do that same for the BMS in the Etowers. Mine spiked to 3.9v the other day.
Spoke too soon, got an alarm today (first one since the update).
The “low side” is peaking above 3.4 now @plonkster
Well, the algorithm still uses a very slow filter to keep the charge voltage stable, so if a high cell voltage develops suddenly it will not respond fast enough. I’m alright with that. If it makes the alarms less – and it seems to do so to the point of eliminating them for most people – I am okay with that.
Is this progress? We’ve progressed from high voltage alarms to low voltage alarms (first time I’ve seen that)
OK, I can see that there was a low cell event just before 8PM. It is hard to say whether there is progress at this point. Having the cells close together at lower SOCs doesn’t tell you much. What we want to see is all the cells above 3.4V, and still getting closer over time. Once they reach 3.45V at the same time, you’re essentially done.
Just seen this topic thanks for all the information. I’ve got two US2000’s that I bought back in 2019 that have been throwing High Voltage errors for a few months now. Haven’t had a chance to deal with it until today when my solar charger shut down with error 38.
I’m not in a position to update battery firmware (although I am on the latest Venus) so assume I am not getting individual cell reports from the BMS. Is buying a new Pylontech battery and installing as master a work around for not having to update the firmware? Or maybe these batteries are now so far gone I just need to a buy a new battery…
Buying a new one will solve the issue around reporting min and max cell voltages, but connecting to the existing batteries is key imo. You need to get some kind of an idea what you are dealing with.
Do you have the cable and software on hand?
Thanks Jaco. No cable or software here. I have not yet spent the time reading up on what exactly is required to connect to these batteries. Having said that I’d be happy to pay you for your time if you interested.
Where about are you based?
Up the road from me …
I need to ship pylontech cables to my clients in Coct for updates, I should get the cables send of then. Maybe to the OP first, and then to my other clients.
Thanks - let me know I’m happy to spend the money on a cable and your time.
I thought about sending my spare set around to everybody, help them and get my cables back. if you want to buy one for yourself I can send you the link. its cheaper that way.
Yes please send the link.
You need to see if your battery needs the RJ11 or RJ54 on the console port and order your cable accordingly.
Johan 
: What would be good is an adaptor so you can buy both RJ45 or RJ11 (or maybe a cable with two plugs) so you have both versions in one package @CenturionSolar
Now that’s a good idea! While your suggestion is sound and technically possible, there is a reason that Pylontech changed the port from RJ11 to RJ45, and that was because the port went into sleep mode on the RJ11 version, so with the RJ45 version, they included a small 12v wake-up pin, which necessitated a redesign of the port. Luckily for our application that’s not in play, but that’s where the change from RJ11 to RJ45 came from initially. But this is a good idea, I’ll definitely see if I can do something about it
Thanks Johan. More for backwards compatibility. I would definitely buy an adaptor for Pylontech RJ45 to RJ11.
After another solar charger #38 error last night I took the batteries down for a closer inspection. I got 2 US2000’s. One I bought in 2019 and the second in 2020. The older one has swelled 
