10 uf capacitor on PJ ac output works

A capacitor on the Power Jack L1 to help with starting motors? Interesting.

A capacitor on the Power Jack L1      

PJ inverter  already   has a 4 uF  capacitor  on L1   .        Need to put one  10 uF 450 vAC   on L2  to  N   .      The 10 uF make the sine wave look good on a oscilloscope  in one of Sean youtube  long time ago .    

Not to start motors, but to make sensitive dishwashers/washing machines stop complaining and do their job.

PJ generally doesn't have any filtration on the L2-N circuit.

Youtube  today  comment  say  40kw is the FETs max .    The GS 12kw will do 13 kw at 75 degree F  so  the surge max I think is 39kw  ?    The screen shot show the GS12 kw  easily  do 12170 watts  at 86 degree  in the basement .    The fan is 101 percent  so it  will  probably max out at 100 degree F  doing  13kw  contiunous .       IT will  not do 12kw  at 120 degree F for sure  and will not try .   

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That's not possible.  Fans can only register 0-100%.

The big number is the load percentage, in the case of the screenshot above, that's 101% load because (12,170W used / 12,000 rated) = 1.014 = 101.4%

The little number in the bottom right corner of the screen is the highest temperature measured inside the chassis.

The little number in the bottom right corner of the screen is the highest temperature measured inside the chassis.

Thank you  as the  temp is 139 degree F  at  12170 watts .   The inverter should  do 13000 watts at 100 degree F  easy  as the  fan is not  running  at  max speed  yet .   IF the surge  is set at  33kw then  all 4 ton heat pump should start easy .      I  like to see  the transformer temp  on the LCD  instead of the  101 load percent .    I  watch the PJ  transformer  temperature  with a  external  temperature sensor and meter  on the transformer  and manually  shut down at  170 degree F .   

If find a reason to upgrade the real can style AC power filters are actually reasonable in price and much safer then putting a regular cap on there. 

1 hour ago, AquaticsLive said:

If find a reason to upgrade the real can style AC power filters are actually reasonable in price and much safer then putting a regular cap on there. 

As opposed to a CBB-style polyester cap that's rated for 250vAC? 

I've never heard of a polyester cap going bad...but I know that HVAC techs replace the can-style oil-filled AC-rated synchronous motor caps on a regular basis.  (Yes, the oil-filled caps can handle significantly higher amperage...and a polyester cap on the AC line won't be running extremely high amperage, but still...)

Power filter caps used for line filtering on sensitive equipment are bigger square cans, they are easy to spot.  They also have a few other components inside the can to arrest EMI and other noise.  Quite a bit different than what is used in HVAC.  Well different use case and the safety features on them are well worth it and remove those weird harmonics that happen on conveyors system that will make the PLC freak out intermittently.  My guess is that they would work great for people with sensitive appliances.

Example of a Shaffner line filter there are lots of different ones out there just grabbed one datasheet.  LINK

17 minutes ago, AquaticsLive said:

Example of a Shaffner line filter there are lots of different ones out there just grabbed one datasheet.  LINK

Ah, aha, yes, those things.

Those serve a completely different purpose than the CBB polyester 10uF caps referenced here (and used in GS inverters).

The line filters work to filter out small noise, etc., etc., but they're far too small to touch the level of noise resulting from an unfiltered SPWM-driven transformer.  The biggest ones only have a 1uF main line filter cap, which is far too small to help.  (How big is the noise on an unfiltered transformer, you might ask?  Easily 10v ripple--that's quite beyond the scale of an EMI line filter.)

The 4.7uF or 10uF polyester AC filter caps actually work in tandem with the ferrite chokes on the transformer primary to create some sort of weird low-pass filter.  It's actually kinda rocket science in that the size of the filter cap is somewhat determined by the physical size of the main transformer.  Too small, you'll get a very dirty output.  Too big, and you'll significantly increase no-load current (and get a loud hum from the transformer.  At least that's my experience on a GS inverter--the PJ inverters run the transformer so noisy that you might not notice the difference.)

If the AC output cap size is in the ballpark, it will actually significantly REDUCE the no-load current.

Yeah check them out and try a decent sized one.  The much bigger ones get pricey but you don't need one of those big ones.  I was just thinking the the smaller type like the 30A one would work for a washing machine.  The bigger ones have isolation transformers which I don't think the power is that bad to need all the extra pieces, but guessing there is a middle ground that would be sufficient.  

The big number is the load percentage, in the case of the screenshot above, that's 101% load because (12,170W used / 12,000 rated) = 1.014 = 101.4%

Look like the GS12kw  can  do  13000 watts  at  100 degree F .  The temperature is only 150 degree F inside the case  .    

The cap across the output creates a LF tank circuit

Done correctly the transformer could be driven with a simple PWM and still output a sign wave ( I used to repair 400hz ones)