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48V Ebike Controller4/25/2021
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If you charge it more than 54.6 volts you risk generating large amounts of heat which could result in the lithium catching on fire and exploding. Also, will I get more speed torque or anything from changing to a different controller. 48V Ebike Controller Full Charge DownA 48V controller will run from 54.6V at full charge down to 42 volts. If you put a 48V battery on a hard wired 36V controller, the 48V battery could run down past 42 v all the way down to its internal limit of 33 volts. Worst case, if your battery gets unbalanced, an individual cell might go below its minimum voltage, which could lead to a fire hazard. Most of the time though, unless you have a really high Amp-Hour48V battery, it will be be too weak to run your bike when it gets down to 40V. You might expect a 48V battery discharged to 42V to have plenty of power for a 36V bike, but the cells are way down on juice and just cannot pump current. Anyway, be careful. No guarantee that you wont hurt battery or damage controller. SInce a 48V battery at full charge exceeds that, you risk component failure. We look for voltage ratings on the capacitors, and expect that the transistors have to be good for 75 volts or more. It will run either 36 or 48 and set the proper voltage cutoffs when a battery is connected. My experience on my ebikes is that top speed is about 20 higher (like 20 mph goes to 24 mph) if the bike has no speed limiter. If I run at the same speeds (but not max), the higher voltage battery with the same AH rating will provide a little more range. If they are rated for 60 volts youll be fine and only run the risk of destroying your battery because the low voltage cut off will be well below the rated low voltage for the battery. If they are rated less than 60 volts youll likely fry the controller eventually, if not immediately. As for a new controller it depends on the wattage rating of the controller. And I read somewhere that a lower wattage controller can milk more range out of the battery. Any truth to this And it hasnt fried the controller, but the last two batteries have died suspiciously. It sounds like I might have this problem: If they are rated for 60 volts youll be fine and only run the risk of destroying your battery because the low voltage cut off will be well below the rated low voltage for the battery. Perhaps replace the controller and get one with lower rated capacitors and FETs, whatever those are. Thus you are correct in that a lower wattage means less power, but also less speed. This means that you will expend less energy fighting air resistance at high speeds, which in theory will give you a little bit more range. If air resistance and heat generated by current running through wires were not a problem, the range would be the same. Batteries, especially lithium ion batteries are horribly finicky things. A 48V battery must be maintained between 46.8 Volts and 54.6 Volts (resting voltage readings).
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