Senior Member
Joined: 11/12/2020
Location: CanadaPosts: 138
| Posted: 01:29am 04 Sep 2026 |
So I compared the power draw of the power board when idling using the Siliup devices compared to the Huayi devices, and only found about a .1w difference.
The bias voltages looked to be good, and then I realized that I was using 2w power supplies, so I have plenty of power supply wattage there.
Then I measured the avalanch voltage for both the Siliup and Huayi devices.
The Siliup devices (rated at 120v) surprisingly avalanched at between 139 to 149v. The Huayi devices avalanched quite repeatably at 128-129v (rated at 125v).
So all things equal, it would seem that if the issue is voltage alone, the Huayi devices are going to fail sooner than the Siliup devices.
I tried measuring the peak voltages while the inverter was running with different loads.
I did measure higher voltages when driving larger loads, however I didn't have a short ground lead so was measuring
much higher voltages than the devices were actually seeing. In the end, I decided to just push the inverter
and see if it failed.
So far I have pushed the inverter to short term loads of 11Kw with no issues, so I am happy.
Long term I plan on winding a second transformer and using a second power stage to drive it.
Power testing on the transfomer shows a temperature rise of 36C at 5100va to the load (sensor measures a 22C rise).
Not sure how hot the inner windings might be getting.
I think on the next transformer, I will bury a temperature sensor.
So I had decided a while ago that it was not cost effective to add capacity to my current battery bank
(currently about 14kw using 24pcs of 36v packs using A123 26650 cells). Batteries are expensive and 14kw gives me about 1 days storage.
Then I saw this marketplace advert.
So yah, I had to pick up some.
I spoke to the people giving away the batteries, and they said that they had over 1000pcs in stock and they were not selling.
Apparently they are expecting to get some all electric busses in for tear down and will soon have better batteries to sell (these batteries are out of hybrid busses)