Seeking that extra range

[BigT]

Hello to all , My friends call me "T" and this i my intro here.
Now I will never claim to be an expert in ebikes by any stretch of the imagination but I would like to share my first ride. My rear motor is the factory geared unit 750 watts with a half twist ,

and the front is a 1000 watt inexpensive direct drive in which I wired in a thumb throttle which resides on the left.
I have to say that having two separate systems is really easy to control off road. Now my factory battery is actually the seat post and the front battery is a 52 volt 10 amp unit . I'm considering adding another battery in parallel for the rear motor.
Any suggestions ?

 

[kevinmccune]

looks good,what about the weight? you could get a "brick battery and customize(have used a good many) it this type of battery usually is cheaper.

 

[BigT]

looks good,what about the weight? you could get a "brick battery and customize(have used a good many) it this type of battery usually is cheaper.

Thanks man , do you recommend a battery blender ? I think that a brick could fit into an ammo box which I could secure in the rear basket keeping it out of the elements.

 

[kevinmccune]

Thanks man , do you recommend a battery blender ? I think that a brick could fit into an ammo box which I could secure in the rear basket keeping it out of the elements.

I made at least 2 battery mounts like that,do put a couple ventilation holes in it,last battery doubling I did before just used a parallel connector.

 

[m@Robertson]

Because you can essentially never say for sure what level of quality control went into any battery blender, and the risks of a bad parallel connection can literally be catastrophic, a blender is a pretty dangerous risk. The one exception to this are the DateX blenders, but they cost quite a bit. With dealers charging hideous markups and buying direct still being pretty pricey.

I always Parallel'd two batteries together directly for my dual-motor bikes, but to make it a reasonably safe choice you have to do a lot of homework, matching cells and pack configs, and charge cycles among other things. And you can never truly not be worried about it when, for instance, charging. Eventually I went to buying a big custom battery with a BMS powerful enough to handle both motors' draw at the same time.

Bicycle Motorworks sells off-the-shelf packs with really big-output BMS' and thats where I'd go to see if I could find a single pack to run both motors. When he was doing custom packs he is the vendor I used to make them for me.

If you go to two batteries, don't try and blend them. You already have two independent systems. Just charge with two chargers and skip all the risks. The amount of effort you will expend (and risk you will create) running two systems on two parallel'd batteries is not really worth it. You have to parallel the packs together... and then split the output back up again to two sources. If you are new at this you're better off doing it the safe way.