PowerJack 30000Watt 48volt LF SP PSW 2 box inverter 2021 model 189 pounds

Just before someone says (like they already have!), "just go to 96v, and your losses will be so much lower"....no, they won't.  Transformer losses will remain exactly the same.  FET losses will stay about the same--as I will have to use higher voltage FETs

The comment  from Sean live chat  is  confusing  as it seem that   KMNL  is correct  when he  say  ...   12000W / 48V = 250A -> every milli Ohm heats with 62.5W . Amps are the problem and should be kept < 100A

1 hour ago, dickson said:

Just before someone says (like they already have!), "just go to 96v, and your losses will be so much lower"....no, they won't.  Transformer losses will remain exactly the same.  FET losses will stay about the same--as I will have to use higher voltage FETs

The comment  from Sean live chat  is  confusing  as it seem that   KMNL  is correct  when he  say  ...   12000W / 48V = 250A -> every milli Ohm heats with 62.5W . Amps are the problem and should be kept < 100A

Also if inverter is LF the losses in the transformer will be large as well because of the huge Amps in the primary wire. I still think that an inverter > 6kW should use at least a 96V battery bank to keep the current reasonable.     My concern is  I can use  smaller diameter wires  but the  transformer losses will be  just as high and  the heat  will  cause  the inverter to shut down at  100 degree F  even with  96v  battery .                No "Holy Grail"   .                 

 

 

 

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The RDSon of the FETs used in the GS is 3.65 milliohm. There are 11 in parallel on each quadrant of the bridge on the 12 kW, according to one of Sean's videos. Meaning that the total FET resistance through two quadrants is roughly 2/3 milliohm. 250*250*0.00066= 41.4 watts total FET loss.

Pretty much how I calculate it....frankly, not including switching losses--but I don't know how to calculate that 😉 .

All I do know is that the FETs run amazingly cool at full load.  Guarantee you that a "Chinese LF" inverter with weak FET driving will run considerably hotter.

an EVE LIFePO4 cell in the 280Ah 6000 cycle rated variety has 896 Wh.... and costs in the neighborhood of $150 dollars per cell delivered....maybe less in quantity????

3.2 nominal volts x 280Ah = 896 Wh...

a 12000 watt inverter at 90 percent efficiency  will require 13,333 watt per hour.

12000 divide by .90 - 13,333 watts

13333 watts x 24 hours = 319,992 Watts....

319,992 watts divide by 896 Wh per cell = 357.13  cells capacity

357 cells @ 150 dollars each =

357 x 150 = $53,550 dollars.... if you could buy them for half that price in bulk it would still be 26,775 dollars plus BMS etc...

Sean says he wants to run 3 of them.....the GS12k inverters....It would be better to get rid of the in-efficient air conditioners and replace with more insulation in his 5000 sf house....but you can get a 26 percent federal tax credit in the USA still in the year 2022....that would help if his wife and Sean can generate a bunch of income....

357 x 150 = $53,550 dollars.... if you could buy them for half that price in bulk it would still be 26,775 dollars plus BMS etc...              Sean says he wants to run 3 of them.....the GS12k inverters..             

I  like  your math  better than Sean  .      I watch his CHAT  again  and he  mumbo   30000 to 40000 dollars  for battery  .   He say he need 4 GS 12kw  inverters   because he use 80000 watt hours per day .      Battery for one inverter is 50000 dollars  so  for 4 GS 12kw  will be 200000 dollars .       50000 dollars for  battery is already too much for me  .      IF I get the  GS 12 kw and wired  direct  to the heat pump I   can  probably  run  8  hours  but use  a portable  AC to keep the GS invetrter below 100  degree F   .    

2 hours ago, pilgrimvalley said:

an EVE LIFePO4 cell in the 280Ah 6000 cycle rated variety has 896 Wh.... and costs in the neighborhood of $150 dollars per cell delivered....maybe less in quantity????

3.2 nominal volts x 280Ah = 896 Wh...

a 12000 watt inverter at 90 percent efficiency  will require 13,333 watt per hour.

12000 divide by .90 - 13,333 watts

13333 watts x 24 hours = 319,992 Watts....

319,992 watts divide by 896 Wh per cell = 357.13  cells capacity

357 cells @ 150 dollars each =

357 x 150 = $53,550 dollars.... if you could buy them for half that price in bulk it would still be 26,775 dollars plus BMS etc...

Sean says he wants to run 3 of them.....the GS12k inverters....It would be better to get rid of the in-efficient air conditioners and replace with more insulation in his 5000 sf house....but you can get a 26 percent federal tax credit in the USA still in the year 2022....that would help if his wife and Sean can generate a bunch of income....

 

 

 

Who is going to run them at 12 kW for 24 hours? Why?

80000 watts hours... probably means 80kWh per day...

that seems like a lot.....for sure... 80kWh x 30 days per month = 2400 kWh per month

at 10 cents per KWh estimate from the grid that is a minimum $240 dollar per month grid bill....just for electricity....most grids have an additional 25 dollar fee just to be connected also...

so for Sean's dream system 4 gs12 inverters wasting electricity over 4000 watts per hour....possibly???

I never heard what they think/project they will waste as heat inefficiency at say: 3000 watt per hour draw from the battery???or 25 percent of the full load capacity..... ????

or just turn the off all his inverters when there is no or insufficient sun power from his PV arrays???

i think the high voltage proponent >>>> jack rickard of evtv motor werks was talking something about a variable frequency to make the inverters more efficient...when he was working with the 30k Sandi high voltage inverter....but said he could not get it through their heads....wonder if the software guy is continuing? ,,,,or maybe Tesla snapped up his talents...

80kWh divided by 24 hours would average only 3.333 kWh per hour so why would one need 4 of the gs12 inverters as Sean desires???

1 minute ago, pilgrimvalley said:

80kWh divided by 24 hours would average only 3.333 kWh per hour so why would one need 4 of the gs12 inverters as Sean desires???

I don't tune in to all the videos that come out, so I have no idea what he's talking about. I know that trying to live off grid the way fat and oblivious Americans live on the grid is next to impossible. Living off the grid doesn't necessarily mean finding a way to store more energy. It should mean using less instead.

they are saying they can run the GS12 inverter 12000 watts continuously and Sean claims it is a 15000 watt transformer....in his YouTube videos....?????

have to ask Sean? he said he reads the forum but never posts....

My thoughts entirely.  But hey, he can go overboard and try to heat the hot tub on solar power in December.  Not my bill!

they are saying they can run the GS12 inverter 12000 watts continuously and Sean claims it is a 15000 watt transformer....in his YouTube videos....??

THAT  was before the  saturday  CHAT where the GS  will run continuouly  12 kw .   Everyone should  see the  saturday CHAT  to really  see how difficult  Sean got himself  into .   I had to watch  many times  and it is now more than  just the  fan  filter  .      So I   ALSO  have no idea what he's talking about. I know that trying to live off grid the way fat and oblivious Americans live on the grid is next to impossible .      IT  is kind of sad  to see the video  .    

High Voltage Solar charge controller for a 20k 25k 30k inverter:

I seen that Morningstar also has a 600 volt MPPT solar charge controller with no moving parts...all solid state....fans are another break down point in off grid solar PV systems...it had no fans....a year 2022 solar video conference on YouTube.🤔🤔

so the 600 volt high voltage system components are still the preferred way for big systems it seems...😎

That's just for solar input.  The output max is 72v, same as their standard 150v MPPT.

In this case, the high solar input voltage helps reduce losses if your panels are several hundred feet away from the solar equipment.  Or if you're tying into an existing high voltage array.

To my knowledge, pretty much all Morningstar products are fanless; I heard rumors several years back about a 3kw fanless inverter from Morningstar, but it never materialized.

ipanda makes a high voltage MPPT solar charge controller that Mike G used it was bought from alibaba or aliexpress... a chinese product...