Pre-Order Discussions

"But it will cost an extra $10 per unit!  That too expensive, the cheaper design work!"

For some reason I doubt this...but can you elaborate/provide a schematic link?

I have not seen active Miller clamp circuits anywhere--but passive clamp methods are pretty popular.

For some reason I doubt this...but can you elaborate/provide a schematic link?

Sorry my  circuit  may not be an active clamp circuit  ?        The  EG 8010  will blow the FETs  if the load  is more than  6kw  and  I  have not try to run  my  EG 8010  that high to  see if the  FETs blow up  .     Youtube  say when  the inverter shut down  like  running  6kw inductive load  and  need   some circuit to stop the  high frequency  voltage spike  from  returning to blow up the FETs   kind of like  back EMF  voltage  spike  blowing up FETs  on relay  without  diode for potection  .    Amber Smith on   his forum  talk about his DIY  EGS002  inverter  FETs blow up when  shutting  down .   I do not think he play with  DIY  inverter  now  .        My EG 8010  is only for  play  .     I do not have  schematic  as  the EG 8010  is too  techical  for this forum  .    When Sean talk about  Miller  and  voltage spike on youtube  I  think  most viewer  find it too techical .  

Just checking in on how the build is coming along.  I got a chance to watch some of Sean's videos this morning and it got me curious if any of the changes will effect the manufacturing process.

October 24th....

I'm afraid the factory is not as organized as we hoped.  "20-30 days manufacture time" seems to have been hocus-pocus.

Does not sound like the PCBs are manufactured yet.  And the transformers definitely haven't been wound.

Factory is paid, so there's no excuses.

Just checking in on how the build is coming along.

He  mumbled something  about replacing the FETs ?     He mumbled something about the worker doing thing a certain way and is difficult make them do thing differently ?     I am not real sure  what Sean say  and he can not explained the technical  side of designing  an inverter .    

No worries, thanks for the update.  Its all part of the process seems to always take way longer than what they say.  Looking forward to the video Saturday. 

Yeah all that just got me more confused, I am thinking that is what you meant too.  He tried to explain it but sounded like he was a bit lost on how to explain what was going on. 

Delays are not our problem at this time...it's the factory and suppliers simply not moving very quickly.

I did ask the factory to hold off on winding the 12kw transformers for a few days until we do a bit more testing--but it doesn't sound like they even have the cores.

Sheesh, we expected to have the inverters by this point........

I also asked the factory to hold off on ordering FETs--but as they don't have the PCBs yet anyhow, and the FETs are a 3-day turnaround, this won't delay things either.

trying to decide if there is a viable reason to switch to Ruichips FETs vs the NCEPower FETs we've been using.  Ruichips ones have a notably lower on-resistance (3.2mOhm vs 3.65mOhm), and the Ruichips body diodes' reverse recovery time is TWICE as fast as the NCEPower ones.

hopefully will be able to make a final decision on that within the next day or 2.

trying to decide if there is a viable reason to switch to Ruichips FETs vs the NCEPower FETs we've been using.  Ruichips ones have a notably lower on-resistance (3.2mOhm vs 3.65mOhm), and the Ruichips body diodes' reverse recovery time is TWICE as fast as the NCEPower ones.

Ruichips FETs are  amazing as I   have not blow up any in over a year .    I  run  the 4 ton heat pump  with the rev 11.1  control  board  for  10 minutes to test .   The  rev 11.1  control board has red light  alarm around 4000 watts .   I  replace with  the new  rev 11.3  control board  and also replace  with the rev 11.3 main board  and ribbon cable and test today  at  4600 watt  and no red light alarm .    I think  I will test to 6000 watts  with this 3 years old 15kw  Powerjack .  

We're you running NCEpower before and having failure's?

We've been running NCEPower FETs for quite some time now...they're just getting a bit harder to get ahold of.  And I'm trying to decide if the Ruichips ones are better.  Thing is, I hesitate to make a major switch like this without fully testing things.

I was referring to Dickson in his PJ 15K

He has been running the rui for some time 

I was referring to Dickson in his PJ 15K  

I  run  NCEpower before   with the  original rev 9.0  control board  on this auction  rebuilt 15kw with an ASL9.0  transformer  .   This  15kw will run a 4 ton heat pump no problem .   When I  run  the 4 ton heat pump for 2 hours it got to  165 degree  F.  and I manually shut down .     The  NCE was 140 degree F .    I waited  5 minutes and started the inverter and   all  48  NCE FETs   explodesd  on 2  large mainboards .   I  replace with 24  NCE FETS again but only use one large mainboard .  I  wait  2 hours when hot  and never blow the NCE again  this time with a rev 10.3 control board and will  do 6100 watts .  I  then  got one   tiny  complete mainboard with  4 capaciors with the  RUI installed   and a rev 11.1 control board  .   The  RUI  never  blow for over a year  but the rev 11.1  control board  red light alarm around 4000 watts  and never get 6000 watts . I now  have  a  rev 11.3 complete mainboard with 24  RUI    and  the ribbon cable  to match a rev 11.3  control board .   I  stop test  with the  EG 8010  but the ASL 9.0  will  work .    This is a story of one ASL9.0 transformer over the last 3 years . It was  fun as long as the FETs  do not blow up .   

Would it be a major deal to switch to Ruichips with the next batch?

I wouldn't make a change like that without at least smoke testing. If you know the current ones will do the job, no reason to risk botching the first batch on a marginal optimization.