Help understanding "overcharge"

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  • @gadgetrider The last brake chopper I worked with (on an agricultural robot) weighed five hundred pounds and needed a separate radiator to keep from melting, so my knowledge of such things has little application to the OW.

    In general the OW design seems to be working near the limits of practical heat dissipation, so I am confident that FM's engineers have considered this.

  • @sam

    Check out this page, tons of answers and guidance

  • @skyman88 oh wow that's a great site! never thought to look for a onewheel wiki page, thanks for sharing

  • @lighten_lens I see... I guess all we can do is ignore him and hope he gets bored and goes away. He clarified further down the thread that it was indeed meant to be a joke... but last I heard jokes were meant to be funny...

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  • My electric car does it the best - whenever it's charged to over 100%, regeneration is disabled. It's a little eerie, because the car will coast like it's in neutral for the first few miles (or, like all cars with an internal combustion engine). Then, regeneration will return.

  • The difference is that an electric vehicle also has friction brakes and a Onewheel does not. I usually do a few laps of the car port before descending our driveway when the battery is fully charged.

  • The Onewheel uses a the Constant Current/Constant Voltage charge technique (CCCV) its pretty common for quick charging. So what happens is when you plug into the board the charger will start giving max current which is 3.5A on this charger. Then at 80% charge the board BMS will start dropping current while maintaining 58V and finish the charge. At this point your trickle charging and the BMS won't allow the board to go above 58.4v. LiFePO4 battery chemistry is very resilient to overcharge and can safely be overcharged to 4.2v per cell. I would not worry about over current at all when it comes to damaging. However the BMS is another story and can shut down the board if it thinks it's overcharging. I'm guessing they play it safe and shut it down way earlier than necessary. Regenerative braking is just a by product of the way the Onewheel is designed. The energy has to go somewhere and it makes it's way back to the battery.

  • @gadgetrider Just an update - current thinking is that leaving it plugged in all the time (not a max of 48 hrs) is perfectly fine and I have been doing it during riding season without issue. I use my OW's everyday from 100% to 44% and plug in overnight. Some days if it is raining out or I don't use it, I leave it plugged in. If I go away for a week, then I may unplug it. Float on my friends...

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