С нуля не пытайся, а если есть старые сгоревшие двигатели, то может просто перемотаешь, да где надо, заменишь-почистишь щеточно-коллекторный узел.electrik.info/…/26-kak-sdelat-prostejjshijj.html
Я приблизительно так считаю 1000/250=4 часа зарядки, ну и плюс где-то пол-часа на всякие потери
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