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Another thought. If the controller could somehow act as a battery charger as well then that would probably be a real benefit in a third world situation. Cheap 3-phase AC motors rewound to work with low voltage packs. Cheap lead acid battery packs. And a controller that takes whatever bit of mains power that can be found and can use it to charge the batteries. Lead acid battery pack so BMS not critical and could probably be omitted. Or if the controller couldn't do the charging then half a dozen cheap automotive 12v lead acid battery chargers could do the job.
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