Those are a bit high. See the PowerForum (they seem to use a lot of Pylontech batteries there), e.g. this post.charliefd wrote: ↑Tue, 19 Jun 2018, 01:00For now (4 days) they seem to do their job but it is obvious they are a poor match to the pylontech battery bank. I use the voltages for charging (bulk/float) that I found in some victron documentation for interfacing with my bateries: 53.2V bulk charge and 53.0v floating.
There is, and I have a document on how it's done. But it's a bit complex, and likely designed for factory or repair depot use only.There is very poor matching on voltage measuring between the 3 units: 0.4V difference between highest and lowest one, with the one in the middle being 0.1V lower than the top value. The difference seems to be constant over a wide battery voltage and current levels. Is there any calibration that can be made on these?
It seems more likely to me that the inverters are about correct (they're usually pretty good; specification is 0.3% from memory, which is about 0.15 V). Have you measured the voltage at the inverter terminals? You are likely to see small variations due to voltage drops across the cables. Are your battery cables thick enough? They should be 25 mm² at least, preferably 35 mm², or 50 mm².
Edit: Also, the inverter to battery cables should be of the same length (to where they are commoned), as near as possible.
[ Edit: cables -> battery cables ]