Thumb throttle and battery

[kmleon77]

HI
I am riding a MP2 with external controller
at the moment I am using a 48V10Ah kokam battery
so my thumb speed control is a 48V one ( it is written on it )
but I am going to change my battery for a 36V20Ah A123 new battery
do I have to change my thumb SPEED control for a 36V one ?

and do you know were I can buy a 36V20Ah A123 battery?
and same question for a 48V20Ah battery with a weight under 6kg? or a little bit more?

thanks

fred

[kmleon77]

hi
other question
with my 36V20AH A123 battery , I will ride less fast than with my 48V10AH kokam battery
but it will react better and I can ride more kilometers
right?
thanks

[Morgen 3Eman]

Hi Fred,
I had reason to pop a thumb controller apart, and the 48 volt marking refers to the LED comparator values.  The actual control element is powered by 5VDC,  and will not be affected by the lower DC supply voltage.  In other words, the throttle will work, but the LEDs will be useless.

TTFN,
Dennis

[kmleon77]

all right
thanks for the answer

and what about the batteries?

fred

[Morgen 3Eman]

Hi Fred,

Hey, I have to warn you that I have an MP3 thumb controller.  I expect it is the same as yours, but I don't KNOW that it is the same. 


Regarding the subject of batteries, all I know is: if it ain't for a submarine, it's a sissy.

TTFN,
Dennis

[Morgen 3Eman]

This is what real batteries look like! 

Dennis

[kmleon77]

 
ok thanks
it's MP2
but you're right
did you have a MP2 before MP3 ?
do you feel a big difference?
fred

[Morgen 3Eman]

Sorry, no.  i'm a newbie to Ebike stuff.  My MP3 is the first for me. I'm putting it in a Morgan-like trike.

TTFN,
Dennis

[Bikemad]

hi
other question
with my 36V20AH A123 battery , I will ride less fast than with my 48V10AH kokam battery
but it will react better and I can ride more kilometers
right?
thanks

Fred, because the 36V pack will have 50% more power available, ~720W/hrs of power compared to the 480W/hrs of the 48V pack, your range should definitely be increased by at least an extra 50%. 

I estimate your top speed will be ~20% slower on 36V than it currently is on 48V. Taking into consideration the much lower wind resistance drag at this reduced speed, I would say there's a very good chance that your range could end up being at least double what you're currently getting.

You'll have to let us know what the actual difference is after you've tried it out.

Alan
 

[kmleon77]

I will do that
just ordered the new battery
waiting for it
will tell you all about the difference felt
fred

[Leslie]

This is what real batteries look like! 

Dennis

Yerr.  I only have 400 ah ATM just for lights and ebike charging off the 320 watt solar panels...  SLA had a tendency to make you buy 5 times more lead than you require. You don't want to use more than 20% per cycle with SLA.

If I want to use 75ah, I would be best to get 375ah of lead. And the individual cells are more expensive to buy.

I await for lithium to become more affordable and this is soon to happen.

http://www.evworks.com.au/index.php?product=BAT-LFP100AHA





AU$135 each. Cycle life: 3000 to 80% DOD, 5000 to 70% DOD

Thats a real cell. Mwahahaha.

 4 cells equal 12.8v and hot off the charge @ 3.5v = 14v so compatible with some solar chargers.  I have 14v setting.

And if you use up to 70% DOD a day, these LI batteries will out live any SLA by years. 13.7 year cycle life at that.  $540 for 4 cells  much safer, and requires less weight, and less room.  Also less cost, because if I want to use 75ah I would only require a 100ah Lifepo4.

So basically multiply the AH you require in Lead acid by 3.75 you can multiply the price say of a cheap SLA 100 ah @ $250 by 3.75 to get the performance and life span of these Lifepo Cells you need to spend $937 lead acid vs $540 Lifepo4.

LifePo4 is working out to be 42% cheaper.

LifePo are very ripe for solar sytems now.

[Leslie]

ok thanks
it's MP2
but you're right
did you have a MP2 before MP III ?
do you feel a big difference?
fred

Ive riden a single MP using a 40 amp continuous controller @ both 48v and 60v. 

And all I can say is hubba bubba, wow.  Popping wheelies and throwing dirt.

Ive modded my internal to do 30 continuous and 50 max.  My software lies.   

If the MP III acts like my modded controller and is reported to be better on the take offs, you will feel the difference.

The MP2 has a current knee circuit off the shunt at peak on max load and possibly programed to operate at low RPM, when you take off the mark. This switches down the current and makes the MP2 sluggish off the mark.  As the bike gains speed if no peak spike has occured over time the controller seems to ramp up the power and it kicks in hard as a mule.

I think this is not the same with the MP3.