Here’s my portable battery charger. It’s a 5HP briggs though delay joined with a 12si 80 amp delco-remy 3 handle alternator. we finished a little electric wires to have a generator of electric power self-energize though becoming different a regulators. It’s runs at 3600 rpm, though to get it to vitalise itself we have to rev a engine on top of 3600 rpm. Just a discerning rev will do it.