That makes sense. It was just strange that I wasn't able to find similar versions reported by users and I'm assuming that's because GKs may not be as popular as other models.coulomb wrote: ↑Sun, 07 Jun 2020, 09:17No. The firmwares for the various models are usually quite different and not comparable. The first two digits (the major version number) indicate the model it's designed for; major version numbers can't be compared to judge age. Generally, minor version numbers (the last two digits) increase sequentially, by 1 for a minor update, and to the next multiple of ten for a major update. But even these you can't compare with minor version numbers from other models to compare age.
Oh that's a really useful post; it should be pinned or somehow made more visible/accessible. It certainly reduces the confusion created by so many models and vendors.Generally, we try to list all the models that a firmware is compatible with, both MPPSolar model name and the Axpert model name. There is the "zoo" post to try to make sense of the various model names from the various resellers. Since the GK is not listed as being compatible, you should assume that it is not compatible. The GK/VM III has different hardware compared to the MG/MKS II; for example, the display is completely different (with its own processor in the case of the GK, but not for the MG), the processor is different and runs at a different speed, flash size is different, the MG/VM II is parallelable while the GK/VM III is not, and so on.
Apologies for the typo. I tried in fact with the correct BTA commands (even with the simplified clever ones) but they don't seem to be supported by my GK device (firmware). It does appear to accept though the BTA0/BTA1 and BTA2 commands, but as far as I understand, they require two reference voltages for both upper and lower bounds of the battery range, which makes things more complicated.The only GK firmware I have access to (version 20.59), and every firmware I've examined so far, supports the BTA (BaTtery voltage Adjust) command. Certainly, "BAT+01" will not work, because you have transposed the first two letters. If that was just a typo from this post, check that you are sending the checksum correctly, or use Weber's clever commands that don't require CRCs with the sign bit set (as set out in this post).
In the meantime I contacted MPP Solar and, to my surprise, they were quick to answer asking for further details. I am now waiting for an "official answer" on how to adjust/calibrate battery voltage measurement on a PIP-GK unit.