My suggestion on the use of a cheap generator is good for running a few different power tools
but not a good option for charging batteries to run a house off.It helps to have all the facts now.
That is a good document explaining the facts,a 35 amp alternator can be driven by a 3hp engine.
A 100 amp alternator needs at least a 5 hp engine.For alternators between 100 and 200 amps the
use of a 8 - 12 hp engine is recommended.
These figures I would say refer to a motor in peak running condition so if you use a old
second hand engine that is well worn you may need the use of a bigger worn engine to
get the horse power requirements.
