Good idea. The only problem is it would need a pulley fitted between the engine and the alternator as the crank isn't exposed.
Lister TR1Maybe an electric motor driving an alternator?
You are right about the fuel use. When we are shearing on a 45�C day under 75% load, the Lister still burns (and leaks!) about 1.5L per hour.
We've bought a Lister TR3 to replace it as the TR1 has hardly any compression and has a spring to keep the dipstick in! Once we set up the TR3 I'll pull it down and rebuild it. Maybe ODK should set up a forum page for the bigger 'small' engines?