Josh
I'll be using 4 lead acid deep cycle batteries that put out 875 CCA and 205 amps continuous and so forth but the motor only uses 133 amps and 48 volts, just want to know if the controller should be rated at 300 amps, 400 amps, 550 amps? I'm wanting to get a curtis controller off ebay and found all three but which one!???
Answer
In my opinion, any one of those would work fine. The main difference is in the level of performance you want out of this bike. A higher amp controller will give you let you climb hills faster, and give faster acceleration in general. The top speed is the same unless you go to a higher voltage. The trade off is, when you are running more amps through your motor & cables, they will heat up and fail if the motor doesn't have some means of cooling (usually a blower forcing air through it) and the cables need to be thicker.
If you have mostly flat land where you live, and an easy-going driving style, a 300A controller would be fine.
Once you are up to speed, you'll probably draw less than 200 amps cruising on flat land.
Definitely install a good ammeter and keep an eye on your motor amps. You might want to avoid several-mile uphill climbs and similar situations that will draw a lot of amps for extended amounts of time. If you draw 500A for more than about 2 minutes at a time, it's very likely that stuff will start burning up. If you anticipate a lot of hill climbs, you should have a blower forcing air through the motor, and a good heatsink/fan combo for the controller as well.
A 48v controller is appropriate for your system. The engineers at Curtis know that a fully charged 48v pack is more than 48v and they have built in the appropriate tolerance for over-voltage. The controller also is capable of feeding more current to the motor than it draws from the batteries, so even if it's giving 400 amps to the motor, it will be pulling much less than that amount of current from the batteries. If you want to have the option to add more batteries and run a higher voltage system, you could get something like a Curtis 1209B or an Alltrax 7245... both of those are rated from 48v-72v so you can run it on 48v now, and add more batteries later if you want to have a higher top speed. Those controllers are a lot more expensive than a regular 48v one, and also physically larger and heavier.
In my opinion, any one of those would work fine. The main difference is in the level of performance you want out of this bike. A higher amp controller will give you let you climb hills faster, and give faster acceleration in general. The top speed is the same unless you go to a higher voltage. The trade off is, when you are running more amps through your motor & cables, they will heat up and fail if the motor doesn't have some means of cooling (usually a blower forcing air through it) and the cables need to be thicker.
If you have mostly flat land where you live, and an easy-going driving style, a 300A controller would be fine.
Once you are up to speed, you'll probably draw less than 200 amps cruising on flat land.
Definitely install a good ammeter and keep an eye on your motor amps. You might want to avoid several-mile uphill climbs and similar situations that will draw a lot of amps for extended amounts of time. If you draw 500A for more than about 2 minutes at a time, it's very likely that stuff will start burning up. If you anticipate a lot of hill climbs, you should have a blower forcing air through the motor, and a good heatsink/fan combo for the controller as well.
A 48v controller is appropriate for your system. The engineers at Curtis know that a fully charged 48v pack is more than 48v and they have built in the appropriate tolerance for over-voltage. The controller also is capable of feeding more current to the motor than it draws from the batteries, so even if it's giving 400 amps to the motor, it will be pulling much less than that amount of current from the batteries. If you want to have the option to add more batteries and run a higher voltage system, you could get something like a Curtis 1209B or an Alltrax 7245... both of those are rated from 48v-72v so you can run it on 48v now, and add more batteries later if you want to have a higher top speed. Those controllers are a lot more expensive than a regular 48v one, and also physically larger and heavier.
Which 250cc bike here is best?
Alex Andre
I am looking for a bigger bike, a 250cc, moving up from a Broncho 110cc. I weigh 175, and I'm 5' 8". I am mainly going to be trail, field, and desert riding, and some street riding (for some of the choices I have I'll be getting the dual sport kit). My choices so far are the Honda CRF250R (MX), a Yamaha YZ250F (MX), WR250R (dual-sport), or a WR250F (trail). I definitely want something with a peppy motor. I also want to be able to go 75-90 stock, or at least with some minor upgrades. I will be buying used, as I don't have the cash to pay for a brand new one. Best choice here?
Answer
I ride a crf250r and the bike is amazing and so powerful. If ur looking for trail riding it would be a good bike but the only problem would be if u stall out on a hill climb it would be hard to start cuz u gab to kick it. I would recommend a crf250x which is the crf250 trail version of the bike. The difference is the bike has and electric start, a bigger tank, and the inside of the engine is a little differnt. It won't have as much power but it would still hav a lot of power. Also if you want to register the bike to be street legal I think it would be preaty hard also a crf250r would be able to do 75 and up. I also go trail riding all the time with my crf250r and it's perfect for it. So I hope this helped
I ride a crf250r and the bike is amazing and so powerful. If ur looking for trail riding it would be a good bike but the only problem would be if u stall out on a hill climb it would be hard to start cuz u gab to kick it. I would recommend a crf250x which is the crf250 trail version of the bike. The difference is the bike has and electric start, a bigger tank, and the inside of the engine is a little differnt. It won't have as much power but it would still hav a lot of power. Also if you want to register the bike to be street legal I think it would be preaty hard also a crf250r would be able to do 75 and up. I also go trail riding all the time with my crf250r and it's perfect for it. So I hope this helped
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Title Post: Electric Motorcyle Issue?!!??!?
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Rating: 83% based on 9498 ratings. 4 user reviews.
Author: Unknown
Thanks For Coming T0 My Blog
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