LiFePOWER

Will probably be disliked to death for this and I'm not defending Pylontech, they don't need it and it's actually in my best interests to bash them to hell...
BUT
From their side, the battery should have been configured correctly and not be allowed to overvolt, the installer should know what they are doing, if they don't it's not Pylontech's fault. They've given the guidelines to follow, if you don't, well...
Best analogy I heard was the charge limit voltage is like a car's rpm redline, it'll allow you to go over but you really shouldn't. Then you proceed to rev the engine above the redline constantly and say it's Ford's problem when it blows...
The reasoning for allowing it to go over volt and not shutdown is as far as I can tell a customer experience one. Pylon's were initially designed and sold in, let's say, more civilised parts of the world where the people installing actually were trained, accredited and therefore knew what they were doing. 99.9% of the time an OV was just a blip and if the battery cut off, the system goes down, customer has a bad day and Pylontech look bad. So they "ass"umed the same here.
Only now down the line once these things have been in the wild west are they seeing the results of cowboy installers. I could tell you some horror stories of electricians who think they know how to install inverters because they're legally allowed to issue a CoC (bonded input and output neutral as well as earth to the chassis anyone?).
OP is likely out 28k unfortunately unless they can make enough noise that CNBM, SolarWay or their installer replaces it. If anyone else has Pylons in their setup, put them at around 0.5V below the max charging voltage on the spec sheet and you'll be fine.

Can see from the logs that it was consistently charging at 53.8-54V, max for a Pylontech is 53.5V. Do NOT exceed this ever or they will void your warranty.


Voltronics and Victron should be set to 53V max, they have spikes in voltage on charging that'll void the warranty as well.
You won't get anywhere disputing the warranty void, this is decided by Pylontech and the local guys have no say, you'll have better luck with the installer asking why he set the voltage to 54.
The Pylontech BMS does not trip at 53.5V to protect from this. Pylons are especially susceptible to over voltage swelling because of this and that they only use 15 puch style cells which means the pack needs to be at a lower voltage and they are less resilient than prismatic cells.
They are currently developing a new BMS that can bleed off high voltage but this isn't in production yet.
No, I can't tell you how I know this.

Can see from the logs that it was consistently charging at 53.8-54V, max for a Pylontech is 53.5V. Do NOT exceed this ever or they will void your warranty.


Voltronics and Victron should be set to 53V max, they have spikes in voltage on charging that'll void the warranty as well.
You won't get anywhere disputing the warranty void, this is decided by Pylontech and the local guys have no say, you'll have better luck with the installer asking why he set the voltage to 54.
The Pylontech BMS does not trip at 53.5V to protect from this. Pylons are especially susceptible to over voltage swelling because of this and that they only use 15 puch style cells which means the pack needs to be at a lower voltage and they are less resilient than prismatic cells.
They are currently developing a new BMS that can bleed off high voltage but this isn't in production yet.
No, I can't tell you how I know this.

These numbers terrify me, my house uses 30kWh Eskom and 25-30kWh solar a DAY!

The only things on Eskom are the geysers and stove.

System:
10kW Kodak
15x 555W JA and Canadian panels (soon to be 18)
30kWh of my batteries
Once I finalise the second string with the 3 more panels the geysers will go on the solar with some home automation trickery I've yet to figure out so should hopefully drop Eskom to nearly zero.

Then the wife has promised her 13th cheque to buy a double gas oven, sink gas instant water heater and installation so then will hopefully be at zero.

I'm saying the irradiance is much less than 1000W/m when it's cold in SA which makes using the STC Voc as the limit for installations incorrect. 
To hit the STC limit you need:
Panel temp 25C or below
1000W/m
Sun zenith of 45 degrees or higher = AM1.5
Worst case scenario, let's say Sutherland, cold/sunny and be overly cautious:
1. Today 18C and say panels at 20C (remember it's cell temp that matters, not ambient, things in the sun get warm, solar cells especially so), 2C above ambient, NOCT (barely) and STC temp check!
2, 1000W/m, it's mid May and I'm only getting 700W/m in Pretoria, would need a CT forumite to confirm irradiance down that latitude. Again overly cautious and say 700W/m, NOCT irradiance fail, well below STC fail.
3. Zenith 40 degree, NOCT and STC fail. Sutherland lost 45 degree zenith at midday 2 weeks ago, never mind when the panels were cold.

Yes it'll get colder but AM/irradiance makes a MUCH bigger difference than temperature to a panels output. To increase irradiance you need to go north in winter. The north of SA loses 45 degree zenith beginning of June, and as it's Musina it's hardly troubling the temperature coefficients.
The only place I can think of in SA where it's going to have a zenith of 45 degree, panel temp below 20C and an irradiance of even 800W/m all at the same time would be a severe cold front with a bit of cloud edge in the escarpment above Louis Trichardt in July and that's just the NOCT limit, would have to be 45 degree, 20C and 1000W/m for STC.
TLDR: use the nominal operating data (NOCT/NMOT) not the standardised test data (STC) for installation calcs. STC measurements are not feasible in the real world and is basically a marketing gimmick to say a panel is X watts, you'll never approach this.
 
EDIT: and to be clear I'm not saying set your string to a NOCT Voc 2V under the inverter limit, be reasonable, but taking 10%+ of the STC margin "as a rule of thumb" is wasting efficiency, maximising PV voltage is the key, everything else cascades after that.

KODAK OG-10.0
UI8204 MAIN
U23503 SECONDARY
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