I think the fuel
costs would need careful research
After ten minutes of research
I notice the 5 liter fuel bottle has a capacity to generate 5.5 kWh of electrical
And it looks like the Comfort 140 model will produce 1.7 kWh per day at a 12v 6amp output to charge a recommended 60-240 Ah battery
bank. At about 140 Ah per day that sounds like a fairly common daily usage on a modest cruiser.
Assuming as such then a 5 liter bottle would last about 2-3 days. Appears to be a cumbersome 6 amp battery charger
that runs out of fuel every three days to me.
The question is, at what cost and how to manage supply of fuel. Which by the way appears to be methyl alcohol or naphtha. Don't no if the bottles are proprietary or how hard to refill.
That's what I got after ten minutes, but I'm not intrigued by any means.
I could be wrong yet again, but seems to me a solar
array producing the same amount of daily energy would be much more cost effective and simpler to use and maintain.