Hyena wrote:If you think this leaves too much to chance remember that for nearly 100 years cars have used oil or check engine warning lights and beepers and everyone knows that if that comes on then you have to stop the engine or risk damaging it (in this case the battery)
However, there have been people ignoring those warnings and driving until the engine blows up, too, even though they know better (like my mom driving a car that threw a rod, knowing that's what happened, until she was all the way home from almost 20 miles away, and the engine was destroyed, or a friend that decided to drive his aging car on a road trip from Phoenix to Los Angeles in high summer, starting out the trip with multiple "idiot lights" on, and actually catching the engine on fire about halfway there, in the middle of the desert).
So...warnings *can* work, but only if you can be bothered to pay attention to them.
People don't even always pay attention to red lights at intersections, drive right thru and collide with cross traffic....
I'd say that's a frequent event, too.
But a hard cutoff might cause hazardous conditions depending on how and where they ride/drive. So there really isn't any good solution except to get people to learn to pay attention, without having to learn it the hard way (and some will not learn even then).
mr.electric wrote:A full BMS would have prevented this incident. The wrong charger and a host of other mistakes would just result in automatic shut off.
The only people qualified to use lipo hobby packs unmanaged for ebikes are those who put the time in studying the dos and dont's...basically people who are on endless sphere frequently.
I'm eager to see a full bms designed for use with hobby king.
Except for a balancing feature, Methods' system already has everything needed for any RC LiPo type packs to prevent the kind of situation that happened here...except that if the user unplugs things (like the actual cutoff module) and plugs a wrong charger directly into the pack, it doesn't matter what BMS is on there. It would still damage the pack, possibly fatally, depending on the charger.
The LVC on Methods' is designed to either cut the throttle (or reduce it), and/or cut power from the pack itself, depnding on which module you use or which wya you wire it.
One thing to remember about the Methods unit is that it is intended as a last-resort HVC/LVC, simply to prevent the kind of failure this thread is about. It's not meant as an everyday cutoff system.