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on the internet I was seeing another company saying their 8k and 12k inverters use a u-shape transformer as it is more efficient than the toroidal transformer they use in 3k to 6k inverters,
it is only an observation, I know your videos on YouTube always indicate you are trying to be more efficient and stable at higher watt output without problems...
your experience is far more extensive in the inverter design than anything I have learned,
just food for thought....
I know crazy huh?
RP series inverter:
1-2KW is EI transformer,
3-6KW is toroidal transformer,
8-12KW is U type transformer. Because of this configuration, the loss is smaller.
Had to do a Google exact search on the "U type transformer" line to find it..."Jesudom" inverters.
They look like run-of-the-mill typical standard rebranded Chinese LF inverters. No photos were given of the inside, but the specifications (which can't be counted on--these are more often than not "copy and paste", and not properly characterized) for the 12kw unit state "Nominal efficiency: >88%". Nothing special to see there.
"Factory photos" at the bottom show EL-core small inverters, HF inverters, and rebranded (small) "AnyPowerCombi" LF inverters that can easily be found online already. Heck, the remote control pictured in one of the listing photos clearly states "AnyPowerCombi"--which seems to have some relation to Sigineer from what I can see online.
From a practical standpoint, if a transformer core is in the actual shape of a "U" (i.e. not a closed path), your losses are going to be astronomical--until the top of the "U" is closed. This is the principle that AC solenoids work on.
https://www.instructables.com/ELECTROMAGNET-From-Microwave-Transformers/
Cutting the top off of regular E-core transformers (i.e. opening the magnetic path) can make some very solid electromagnets 😉. You'd better believe the power consumption is extremely high until a magnetic material "closes" the loop.
your experience is far more extensive in the inverter design than anything I have learned,
This youvideo show Sean say the new high efficiency 12kw transformer has 50 percent more winding than the old 12kw transformer and cost a lot . I think you can use the cheaper old 12kw transformer core and put 50 percent more winding and it will work . The new case is too small for air circulations . The good FETs maybe out of stock and will delay the next prototype ? I only have enough battery to run 8000 watt continuous that this prototype can do now .
i have several microwaves in the junk pile. i always wanted to tear into them... maybe i will next summer or so...thanks for that link repurposing the microwave transformers.
still watching your gs 12k evolve!!!
From a practical standpoint, if a transformer core is in the actual shape of a "U" (i.e. not a closed path), your losses are going to be astronomical--until the top of the "U" is closed. This is the principle that AC solenoids work on.
Did some Googling myself on this out of curiosity. There's more to it than just a U. There should also be a closing I piece across the U, or even two U forms face to face. It's similar to how E core transformers don't just have single direction E forms. They'll have an I piece across the top or other E forms pointing in the other direction.
Ok I guess that means I have worked with U transformers
They are basically flattened toroidal transformers
The ones I worked on were 1KW 1KHz square wave inverters for window defrosters
Very basic unregulated noisy
Primary advantage is consistent winding density