Hello, I'm brand new to the forum and new to the idea of CHP, but I'm very keen to get started.
I have a friend who is way ahead of me and I'm gleening as much information from him as I can. One thing he tells me is the importance of rotational mass and advises me to wait for an ex Start 'o' matic CS as they have heavier flywheels. I intend to fit a heavy pulley to the generator.
So! how important is rotational mass? I understand the theory of it but does it really matter if the lights dim for a second or two when you switch the kettle on. 
Many thanks for reading and I look forward to your replies. 
Rob