Electronics > Projects, Designs, and Technical Stuff

Petrol Generator Mod - Inverter AC Output

<< < (10/11) > >>

WanaGo:
As mentioned already though, I can run drills and angle grinders directly off the raw AC from the generator without issue, the engine hardly blinks an eye.
Yet when I ran the angle grinder off the inverter, it blew the FET's up.
So not quite sure what you are saying here, as the generator side of things seems to cope fine, and the inverter doesnt, so its the inverter I can trying to protect with the NTC idea, to try and stop the FET's blowing from surge loading from things like an angle grinder.
Yes the generator isn't a large battery, but at the same time it seems to handle the output required to start the angle grinder...

Thoughts on this...

Johnny B Good:

--- Quote from: WanaGo on January 31, 2019, 12:13:06 am ---As mentioned already though, I can run drills and angle grinders directly off the raw AC from the generator without issue, the engine hardly blinks an eye.
Yet when I ran the angle grinder off the inverter, it blew the FET's up.
So not quite sure what you are saying here, as the generator side of things seems to cope fine, and the inverter doesnt, so its the inverter I can trying to protect with the NTC idea, to try and stop the FET's blowing from surge loading from things like an angle grinder.
Yes the generator isn't a large battery, but at the same time it seems to handle the output required to start the angle grinder...

Thoughts on this...

--- End quote ---

 The only thought I have on this is that either the switching FETs are too underrated for the task or else there's a design flaw subjecting them to high voltage transients. If you're still waiting on the 3000W version to turn up, you might have better luck with that seeing as how they've doubled up the FETs in that design.

JBG

schmitt trigger:
WanaGo;

I know for a fact, as stated earlier, that series wound motors as found on these types of tools, draw very significant inrush currents.

Do you have access to a current clamp meter? Otherwise, we are only speculating at the current surge levels.

WanaGo:
Yep I have a current clamp meter. Just not sure its fast enough to capture surge, but ill give it a try.

Circlotron:
Measure what it pulls with locked rotor and 24VAC applied. Then multiply by 10. Actually it might pull way more because presumably the magnetic would be saturated?

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod