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21 hours ago, Sid Genetry Solar said:I don't see any way for the control loop to run any faster than 120Hz (i.e. once per half wave), as the entire wave has to be measured before a decision can be made. And even that runs risk of going into oscillation with high/low wave (ESPECIALLY if you've got a heat gun with a "medium heat" that just puts a diode in the circuit, clipping off half of the waveform).
worth noting that the PJ inverter regulation runs a perpetual +1/-1, so one wave is always a tad higher than the other--and one side of the H-bridge runs just a little hotter than the other 😉.
Actually control loop can run much faster than 120Hz. Inverters that do load and harmonic disturbance rejection/compensation can have control loop running at the same frequency as the voltage and current sampling frequency often in the 1-10KHz range. 120Hz is way too slow to adequately handle significant non-linear load disturbances and transients.
41 minutes ago, JIT said:Actually control loop can run much faster than 120Hz. Inverters that do load and harmonic disturbance rejection/compensation can have control loop running at the same frequency as the voltage and current sampling frequency often in the 1-10KHz range. 120Hz is way too slow to adequately handle significant non-linear load disturbances and transients.
Technically, yes....but that requires a *much* more powerful processor for that.
15 hours ago, Sid Genetry Solar said:Technically, yes....but that requires a *much* more powerful processor for that.
Yep ... but a relatively small HW cost increment relative to the system HW cost. The firmware dev and test cost is another matter.
15 minutes ago, JIT said:Yep ... but a relatively small HW cost increment relative to the system HW cost.
Well, if I go from an American MCU to an Asian one, it actually decreases the HW cost 🤯........
what is the best way to increase the inverter voltage output???
on a PowerJack 20000 watt psw sp lf inverter???
7 hours ago, Sid Genetry Solar said:Well, if I go from an American MCU to an Asian one, it actually decreases the HW cost 🤯........
That's like the PJ way ... save $1 to cripple a system that costs hundreds $$$ just to ship and waste all the potential ...
That's like the PJ way ... save $1 to cripple a system that costs hundreds $$$ just to ship and waste all the potential ...
No, no, you've got the point backwards.
Take an American-made MCU with the following attributes:
- very expensive
- barely adequate in processing power (8-bit, 16MIPS)
- literally maxed out in peripheral ability
- hard to procure
- currently boasting 0pcs in stock for the entire U.S.; we can only buy it from China from old stocks and/or recycled e-waste!
- China isn't stupid--they know it can't be bought anywhere else, so it goes for a premium price on top of the high initial price...think upwards of $10 apiece...
- lead time of 66 weeks from the U.S. manufacturer, thank you very much
- currently boasting 0pcs in stock for the entire U.S.; we can only buy it from China from old stocks and/or recycled e-waste!
....to an Asian MCU with the following attributes:
- almost 1/5th the cost (~$2.50 apiece)
- leaps and bounds more powerful (32-bit ARM core, running 48MIPS)
- considerably better peripherals (even includes USB 2.0!)
- better stocking (in China--there are no distributors in the States)
- much faster lead-time if out of stock...I'm waiting on the exact time right now actually
...yeah, it's not a cost savings exercise as much as a lifeline that happens to come with reduced cost.
i see they are shipping lf psw sp parts inverters selling on eBay out of East Lansing, Michigan
solarpower-usa is the powerjack seller...
not the same seller i bought from>>>(at least not the same shipping location)
I think they just relabel and sell from the same manufacturing plant... they just cant waste the time to pay diagnosis and repair...
2 hours ago, pilgrimvalley said:what is the best way to increase the inverter voltage output???
on a PowerJack 20000 watt psw sp lf inverter???
Maybe try floating it in a stock tank? 🤪
I mean, I dunno...what do you have on it? Any voltage adjust knobs on the front? How far off is the voltage?
Maybe try floating it in a stock tank?
sounds like a country bumpkin solution
powerjack quality control is definitely lacking a bit....i am still testing and checking the parts but had to scoop snow today to feed the livestock alfalfa hay >>> so not much progress yet... and the wind was super cold, then broomed the snow off the solar panels,,,, coffee time periodically to allow the fingers to warm up...
will do more when i heat the work space a bit....🤔😎
see they are shipping lf psw sp parts inverters selling on eBay out of East Lansing, Michigan solarpower-usa is the powerjack seller
IS East Lansing Michigan where Sean other address is at ? All my PJ parts come from China or Walnut . Never see solarpower-usa on ebay .
my solution to a computer fix is a good old fashioned sledge hammer
especially a linux one...
IS East Lansing Michigan where Sean other address is at ? All my PJ parts come from China or Walnut . Never see solarpower-usa on ebay .
i think so...
here is a listing for a refurb one also....they have a 100 percent positive with 43 ratings...
my 48-volt asl9 20000 watt powerjack lf psw sp parts machine came out of Walnut, California the 130 plus pound beast