August 24, 20215 yr I recently replaced my 6 year old RCT Axpert 5kw inverter with an Axpert Synapse King 5kw. I made some observations that I do not understand: 1. The fan(s) of the Synapse comes on as soon as loading starts and increase in speed (and noise) as loading increase. The fans of the RCT only came on when the loading has increased to a capped kw. 2. In both the SUB and SBU settings in 02 the Synapse switches/ alternates between solar and battery/utility when battery is fully loaded and the household load is under 100w. Why does it not stay on solar - even when the panels provide enough watts? 3. When the Synapse is charging the battery with solar the fan increase and decrease in speed with the changes in the brightness of the sun. The brighter the sun the higher the speed of the fan. Can anyone explain, please. A general observation: The Synapse is less gittery than the RCT. The RCT more often and quickly gave an alarm and switched to utility when the load reached more than 2kw. The Synapse however remains stable even with the load near 3kw and with the pylontech at 48v. David
August 24, 20215 yr 53 minutes ago, David Botha said: 1. The fan(s) of the Synapse comes on as soon as loading starts and increase in speed (and noise) as loading increase. The fans of the RCT only came on when the loading has increased to a capped kw. The 6 year old firmware was probably a bit lax with running the fans. They went from way too much fan speed to too little, and later models have most of the fan usage during the day, when it is needed most. 53 minutes ago, David Botha said: 2. In both the SUB and SBU settings in 02 the Synapse switches/ alternates between solar and battery/utility when battery is fully loaded and the household load is under 100w. Why does it not stay on solar - even when the panels provide enough watts? What is your main firmware version number? There was a lot of problem with this sort of thing in earlier firmwares. 53 minutes ago, David Botha said: 3. When the Synapse is charging the battery with solar the fan increase and decrease in speed with the changes in the brightness of the sun. The brighter the sun the higher the speed of the fan. This is part of getting the fan to run enough to keep the electronics cool, and not making too much noise at night.
August 24, 20215 yr Author Thank you, Coulomb. I do not see any version number on the side sticker of my inverter. I tried to attach a photo, but it was rejected as to big. Can the bar code help?
August 25, 20215 yr 22 hours ago, David Botha said: I do not see any version number on the side sticker of my inverter. The firmware version number isn't on any sticker. Usually you can find it on the front panel, pressing up and down buttons, until you get a page starting with "U1". Or Watchpower can display it. Quote I tried to attach a photo, but it was rejected as to big. Can the bar code help? No, because the main firmware version number is what I want. IF it's Voltronic Power compatible, AND it has older firmware, a firmware update might fix it. Or brick it, if the Synapses are poor clones. But I suspect that either they are not clones at all, or are not poor clones.
August 25, 20215 yr Author The main CPU version at U1 is 00071.97 and the secondary CPU version is 00002.66.
August 26, 20214 yr 20 hours ago, David Botha said: The main CPU version at U1 is 00071.97 and the secondary CPU version is 00002.66. Those are the latest versions I have. So that's not the problem.
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