Originally Posted by
disaster999
Im sure theres more than "just a BMS for the battery". There must be some logic and voltage and current detection and power switching from battery and AC power. It needs to keep the battery at a low charge all the time in order for it to be ready to accept charge back from the charger and be intelligent enough to switch to AC power when the battery voltage drops too low.
Power supply is always on. BMS is set so that battery is kept at a specific storage voltage and not a full charge, that way there is room in the battery to accept a discharge. Power to charge is provided by the battery until it sags below a predetermined voltage and then the power supply will start providing power to cover the power needs of the charger and get the battery back up to the storage threshold. I'm doing something similar on a much larger scale, albeit less expensive and bulkier, with a 100aH LiFePO battery and small AC charger. This is feeding up to 10 racers running up to 12 charger channels.