This one looks pretty small, maybe you could shed a couple pounds off it. Stash it in your trailer if your going on long distance cross country ebiking, so you are not stranded with no outlet between towns, thats what I am thinking anyways.
http://www.getearthquake.com/inverter-g ... r-800-watt
40cc 21lbs 15x8x14 6.5A 120V out, 12VDC3A out.
A little smaller size wise, same weight, less output.
http://www.powerhouse-products.com/powe ... duct/500wi
31cc 21lbs 12.6"H x 8.2"W x 14.1"D 12VDC2.5A 120VAC 4.1A
This one is 19lbs
https://www.homedepot.com/p/Dirty-Hand- ... /206958269
https://www.alibaba.com/showroom/450-wa ... rator.html
1L of gas is 1.7lbs.
DIY Custom generator, cant be that hard to do can it?
Can we get the weight even less then 20lbs, I doubt it.
Something like the Power Sonic battery, say 12V 10Ah weighs in at 7 or 8 lbs. Alternator would weigh in at say 10 lbs. Already pretty close to 21lbs of an inverter gas gen. The size of those gas inverters on a trailer, well 15x8x14" aint bad at all.
I'd look into a small 30cc weed wacker motors, then the generator part needs figuring out. Perhaps a 30-70A car or 1/2 truck alternator, running a 12V inverter 120VAC 6A output, more then enough for MW 4A requirement.
https://www.harborfreight.com/750-watt- ... 69660.html
Could you run inverter right off alternator or would it fry it with too much amps. Or could you throttle the gas motor for just the right amount of amps. Who knows.
If battery is required then gotta figure out what deep cycle battery the alternator will charge.
I am sold on a little 500W generator that can handle 4.5A at 120VAC and placed inside a trailer to charge up a battery pack while going multi-day long trips.
I spent the last hour or so trying to find a lighter genset, and I found nothing below 21 or 20lbs. I can't tolerate sitting around doing nothing waiting for solar to charge. I know Mcentyre with his yescomusa ebike does solar charging at his school he works at, but there are plugins there, its a teaching aid or some idealism which I commend him for doing it. I cant imagine being on the side of the TransCanada highway, with 5 to 9 square meters of solar panels, waiting for juice.
Also with 10Ah city commuter pack, I try to get everything done, but I sometimes run out of juice say on the last mile or so, and walk home. So I just need a little 2 to 3Ah pack with them 25A 18650 next to my charger in my backpack to get me home. There has been a half dozen times now, walk home with ebike.