Chris Hobson

The fan speed is definitely related to the SCC. We are having a day with broken cloud and the fan speed is varying all the time. Since I have the model with external SCC heatsink the increased fan speed seems unnecessary although I would admit the heatsinks are considerably cooler.

I am going to have to go back to 72.70c. The noise levels are too distracting and although the ability to go into standby is really convenient the noise trumps it. I don't think the fact that the machines run 8 degrees cooler can be used to argue in favour of the more responsive fans. Reversing the fans in 2016 has already got the machines running 15 degrees cooler.

Morning Gerrie - the inverter not switching back on is due to the battery voltage being too close to the battery low cutoff voltage. What the difference needs to be depends on what firmware you have. With @Coulomb's lithium firmware I think it is 2V and vanilla it's 4V. It may be 1V and 2V respectively I can never remember. You can solve this by temporarily lowering the setting of Program 29, switching on the inverter and raising the setting back to its recommended value. There are scenarios where the battery voltage is low and if the inverter was on it would run but the voltage is too low and

I noticed yesterday that the SCC heatsinks were considerably cooler and that the inverters became quiet when we were in float even though I was still drawing 2kW. I have 3000W of PV on the one inverter and 1500W on the other.

My inverters are in our family room/TV room/office next to my desk. The inverters have never bothered me before - when someone used the microwave the fans would be noticeable but other that that the PC made more noise than the inverters. Now with the 2kW baseload I have during the day the inverters are 8 degrees cooler but irritatingly noisy.

A DC contactor where the coil is closed via AC would be ideal NO would power off grid NC would power grid tie. ABB make a DC compliant contactor or you could use a ordinary contactor with a snuffing capacitor.

Hi @wolfandy it works perfectly an switches immediately. Since I have not integrated the script into Node red yet I am using SSH at the moment at the appropriate times. I will after a while be able to see how much I am saving. When I flashed 73.00e I had a "jelly bowel" inducing moment where the flash failed and the inverter appeared to have been bricked. I re flashed again and the inverter came to life with myself being the only thing suffering from the ill effects of the failed flash. @Coulomb is there a version of the firmware that has the standby features of 73.00e and the fan

Ok finally I have it working wake.py One could include a loop to ensure you have an ACK but I'll leave that for the weekend. Thank you so much @Coulomb

Lol yes in between all the madness I find I have a little development time for myself.

Hmm @Coulomb I have been looking at your documentation and am not sure whether dynamic load control is implemented by 72.70c or not. I have found my USB to serial cable and can reflash to 73.00e but am a firm believer in "If it ain't broke do fix it" principle. How is the integer used in the MNCHGC0497/MNCHGC0498 pairing derived?

The old PF 0.8 Axperts had a quiescent power use of about 50W - which would be 1200Wh per day. Perhaps the newer inverters are more efficient or the quiescent consumption is lower in bypass mode.

I would have a change over switch an run solely on generator until solar/battery is restored. A Pylontech 3000 can charge at 34 A or roughly 1700 W. I charge my Pylontech (4 x 2000s) at perhaps half their rated maximum of 100A. I have a 1.2 kW pump that runs everyday and a 1500W geyser element that mops up any excess energy, so I probably charge at about 40 A for large parts of the day. I find mid summer the bank of Pylontechs charging at 90 A can ramp up their temperatures.

These are a pair of PF0.8 models running LF1 72.70 C patched software. So reflashing with your latest firmware (73.00e) will enable these commands?

After 5 years (yes one of those back burner projects) I am communicating with my Axpert using my own scripts. A Czech Axpert user, Josef Kriegelstein has a pair of commands MNCHGC1497 and MNCHGC1498 to cause the Axpert to go into standby mode and revert to normal. They look more like charging current commands. I have used them to no success, getting a NAKss response from the inverter. Anyone had any success getting a inverter to switch off. I have a pair of inverters and after 6pm there is not much sense having both running.

Heroldts in Bloemfontein was importing Synerji inverters