Questions About Max Discharge Amps

[CoffeeandBikes]

Hello All!
I recently purchased a Zeegr Dual Motor (1,000 watt each - 1,500 watt peak) Dual Battery F1 Pro. It has 2 - 22.4 ah 48v batteries. It uses a battery equalizer/balancer/combiner to join the 2 batteries, BUT you can run the bike on 1 battery at a time. I've been running the bike on one battery at a time so I can use the second battery as a "reserve tank" to make it home. This is a massive boon that eliminates range anxiety.

Yesterday, I looked at both of the batteries. They don't list a continuous discharge amperage, but do list Max discharge 40 amps. My question is will I fry my battery running full throttle with both motors? Both controllers have a peak of over 20 amps. The front motor controller is a few less amps than the rear, but still over 20 amp peak.

Thanks!

 

[biknut]

What you describe sounds like your battery has a 40 amp bms, so as long as your controller is less than 40 amp you're good to go. Peak amp isn't an issue because the duration is not going to be long enough to matter .

 

[CoffeeandBikes]

What you describe sounds like your battery has a 40 amp bms, so as long as your controller is less than 40 amp you're good to go. Peak amp isn't an issue because the duration is not going to be long enough to matter .

It's a dual motor - both 1,000 watt (claiming 1,500 peak). Each motor has it's own controller. One has a max amp around 28 and the other a little over 20 amps. So, with both motors wide open it would be 40+ amps. I hope you're right and the Max discharge amp is a BMS rating. If that's the case the BMS "should" cut off power before damage occurs, right?

I can run both batteries together, which would put both batteries well below their maximum discharge rating. The problem is I really like having one battery turned off to use as backup in case I get too adventurous

 

[biknut]

Usually most bms will tolerate over current for 10 to 20 seconds depending of how it was programed at the factory.

 

[Annieolnie]

I'm not sure how this works but "Bluvall" sells your bike and stocks extra batteries. Your battery is UL2849 listed, so that's good and they are bragging a bit in the ad about having a good bms. You could go on their chatbot and ask them exactly what the bms is rated for. I don't think it could get that UL listing unless it was capable of handling how the dual motors had been setup.

 

[BiggKidd]

If you run each battery alone you are actually shorting yourself in a couple ways. First by running the batteries harder than needed by running one at a time. Secondly the larger the bank with a given discharge means more battery life. Look at how batteries are rated in amp hours.
IE: at a 1 hour rating 90AH, 5 hour rating 94AH, 20 hour rating 100AH for the same battery.

 

[CoffeeandBikes]

If you run each battery alone you are actually shorting yourself in a couple ways. First by running the batteries harder than needed by running one at a time. Secondly the larger the bank with a given discharge means more battery life. Look at how batteries are rated in amp hours.
IE: at a 1 hour rating 90AH, 5 hour rating 94AH, 20 hour rating 100AH for the same battery.

Yes, I know that, but range anxiety is a thing. It's very hilly and windy where I ride. The good thing is when practical I use the rear motor only and not full throttle. Now that I realize the battery limit, I will not go full throttle on one battery with both motors. I'm sure I'll get used to the range of the bike and start using both batteries simultaneously. Thank you!

 

[BiggKidd]

Your welcome.