Guru
Joined: 13/10/2014
Location: AustraliaPosts: 1668
| Posted: 10:50pm 10 May 2024 |
Thanks for the comments, it's interesting that the only change to the main inverter had been the Nano Controller. The only internal change was to the Controller board connections.
I have a feeling this could be a difference between the 8010 and Nano timing OR algorithms.
There is a visible change in real world feedback, lights not flickering when they were before, these long LED fluro replacements, 12 of them in the workshop, are very sensitive to the slightest change in AC. Then you have the DSO display of AC output, the speed of correction appears like fast a "single step process" correction that holds the AC steady.
I mean, having to stare at the DSO to catch the slightest of movement right at the top of the waveform as I dump 2.3kW onto the Inverter is impressive, so much so that I had to look down to check that the Load had actually switched on - as this Inverter never makes a sound unless you dump very bad complex loads onto it, like a heat gun with a diode in one side of the mains for low heat. You hear a little buzz under that load, a low cost 2kW OZITO SCR variable-heat gun is completely silent.
I know what the Nano spwm code is doing, and obviously it is not a single step control process. I put the DSO waveform appearance down to the controller speed, algorithm and design changes made by Wiseguy for AC VFB.
Although the Nano controller is "similar" to the V5 8010 controller AC VFB interface, the V5 board was also designed by Wiseguy, it uses the same Symmetrical drive and same footprint as the new Nano controller - This made it easier to swap it over as it screwed into the same location with just connection plug changes needed.
This morning I swapped out the 24v Kilovac and 48v-24v DC-DC PSU that powered it.
The new 48v Kilovac connects straight to the controller and 53V switched input.
That change bought Idle power down a few watts to 23 watts - considering that the lowest load on this inverter is around 280 watts - 23 watts is nothing - And the inverter is either ON or OFF, not idling with no load - It auto starts from OFF if the property is ever switched over to mains priority and the mains fails.
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