Does a medium sized SE exist that could charge 12 V car battery properly?

[Spacefog_]

If not, how many small SE would it take to do so? Looking for things on the market today, things that have been built in the past, DIY's; anything. Working fluid being air (preferably not pressurized).

[Stroller]

8 amps would be a good charge rate for a 12V car battery. That's 12*8 = 96 Watts
An unpressurised SE using air making 100W might be fairly chunky unless its of Andy Ross level sophistication. Possibly bigger and heavier than my 40 year old Honda EG550 sidevalve generator, which will make 450W continuous power on around 12oz of gasoline an hour. I picked mine up off the 'bay for £50. Another option would be the Yamaha EF600 600W.

An unpressurised SE using air making 100W will be quieter, but it won't be silent, and it'll use a lot more fuel. How much does some noise matter in your application?

https://youtu.be/m7J2MUGIwfw

[Tom Booth]

8 amps would be a good charge rate for a 12V car battery. That's 12*8 = 96 Watts
An unpressurised SE using air making 100W might be fairly chunky unless its of Andy Ross level sophistication. Possibly bigger and heavier than my 40 year old Honda EG550 sidevalve generator, which will make 450W continuous power on around 12oz of gasoline an hour. I picked mine up off the 'bay for £50. Another option would be the Yamaha EF600 600W.

An unpressurised SE using air making 100W will be quieter, but it won't be silent, and it'll use a lot more fuel. How much does some noise matter in your application?

https://youtu.be/m7J2MUGIwfw

Letting your pants down petrol shill?

I'm pretty sure Spacefog_ didn't join the forum for advice on fuel efficient gasoline generators.

This is not a recommendation but I managed to get 8 volts open circuit from this engine before it blew a seal.

It went up to 8 volts off camera when I held it down to reduce vibration, but then a little plug blew out before I could move the camera.

https://youtu.be/sjDE4pf1zNY?si=fo5pHE1ues2ieN-P

Don't be fooled by the propane torch. I was trying to see what I could get the engine to do with as much heat input as possible, but it runs on MUCH less heat. The extra from the propane torch didn't really help that much.

https://youtu.be/546LT0AnL40?si=xazwJbafk3qqn593

These small Stirling battery chargers were available but are currently sold out of something I guess

https://www.ebay.com/itm/204296343706

[Tom Booth]

BTW, that eBay engine looks bigger than it actually is.

There is a pretty big compartment underneath just for housing the burner.

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