Guru
Joined: 16/02/2019
Location: United StatesPosts: 960
| Posted: 05:22am 06 Jun 2021 |
It definitely sounds like it is revving up and down
tranny is so quite you almost have to put ear on it to hear it hum
I didn't wind this tanny the ones I have wound don't hum at all at idle
Warpspeed instructed me to wind transformers
His way makes a salient tranny with lowest possible idle loss
I am very grateful he told me 5 billion times until I finally understood!!!
This inverter didn't do this pulsing the last year or two when hooked up as 120 volt only
I used the builtin on board filter cap and another across 120 volt out of tranny
This is the same tranny
Before the two windings was paralleled
Now they are hooked in series with one wire of each winding being center tap
Got to love usa electrical system
I always check dot with ligh bulb switch trick before hooking winding in series or parallel
As I was taught on here
The inverter is putting out 120 on both legs and 240 across both legs
This inverter board has a current shunt built into the board on the negative side
The big caps are hooked in after that shunt on negative bus bar on bottom of the board
The positive is hooked into positive heat sink
I used sawdust in resin when potting tranny
I am thinking the backfeed circuit is not getting filtered enough
But I would really appreciate some input from you guys
Thanks everyone I appreciate you guys!!
Edited 2021-06-06 16:14 by BenandAmber