3 hours ago, Coulomb said:

Ah! My bad. I keep confusing Synapse and Synergy. Synergy are the clones I was thinking of. Sigh.

Having firmware in the Voltronic FTP domain certainly clinches it.

So @Pieter v D, there should be no problem paralleling these.

If you're not concerned about the stuck at 90 V issue, it may be safer to parallel 45.13 with 69.07, since these are both from early September 2023, so they are probably compiled from the same source code (and so should operate identically on their respective processors).

 

 

This is good news, thank you. 

I've not read up about the "stuck at 90V" issue. What is the summary? 

The Kodak is on 69.01 and 12.21 currently - haven't re-flashed it yet - and it runs very well (about 12 months now). Have not connected the Synapse yet - but have flashed it to 43.13 and 12.28.  

 

 

 

7 hours ago, Pieter v D said:

I've not read up about the "stuck at 90V" issue. What is the summary? 

There is a huge thread on it.

Summary: Most Axpert Max firmwares (except for a few "experimental" ones), and all VM III and VM IV firmwares, have a bug where the PV voltage can get stuck at a low value, usually close to the bottom of the MPPT range (90 V or 60 V), particularly in low light conditions (early morning, late afternoon, cloud, and rain). In the morning, the voltage will eventually shoot up from say 92 V to say 276 V, tripling the PV power. All that time from dawn through to this voltage rise, you've been missing out on up to 2/3 of available PV power. In some cases, on cloudy days, you can miss out on 75% of available PV power. But on a sunny day, the loss might be negligible, depending on many factors.

Georg594 pioneered a patched firmware that largely fixed this issue, with the downside that you end up with a fixed minimum PV voltage. So someone with 4S panels needed a different patched firmware than someone with 8S or 10S panels. I extended the patched firmware to other models. It looks like Voltronic have fixed the problem in a way that works for all panel configurations. But for whatever reason, they don't port the good code to "mainstream" firmwares. I'm able to recognise the presumed good firmwares, and list them here.