GoldenMotor.com Forum

General Category => Magic Pie & Smart Pie Discussions => Topic started by: Lazyrider on October 30, 2013, 12:42:15 PM

Title: Battery upgrade
Post by: Lazyrider on October 30, 2013, 12:42:15 PM

I'm looking for a bigger battery for my 48v dual MPIII, but am a but confused as to what to buy.

Some of the 48v LiFePO4 batteries I have looked at have an actual charge cutoff voltage of 56-62v(will this cook the internal controller?)

Some are advertised with BMS powering 1000w bikes, other 3000w etc- does this mean anything or will any 48v be good enough?

Is this the sort I need

http://www.aliexpress.com/item/FREE-SHIPPING-Lithium-Rack-Battery-48V-20A-with-charger-Increase-the-height-of-the-battery-box/1180522715.html (http://www.aliexpress.com/item/FREE-SHIPPING-Lithium-Rack-Battery-48V-20A-with-charger-Increase-the-height-of-the-battery-box/1180522715.html)

Title: Re: Battery upgrade
Post by: Lazyrider on October 30, 2013, 12:53:10 PM

would something like this blow the capacitors? BMS[/acronym]-6A-Fast-Charger-and-Bag-For/593717383.html]http://www.aliexpress.com/item/Free-Shipping-Wholesale-Cheap-48V-25AH-LiFePO4-Battery-with-BMS-6A-Fast-Charger-and-Bag-For/593717383.html (http://www.aliexpress.com/item/Free-Shipping-Wholesale-Cheap-48V-25AH-LiFePO4-Battery-with-[acronym=Battery Management System)

Title: Re: Battery upgrade
Post by: jvr on November 04, 2013, 04:33:09 PM

Every 48V LiFePO4 battery has about 56 V, if it is fully loaded.
MPIII with internal controller has Vmax of 60 V (look up the specs in the datasheet),
so this is ok.

I am not shure if the LiFePO4 battery really can deliver more than 2 x 20A = 40 A of power!

Title: Re: Battery upgrade
Post by: Lazyrider on November 06, 2013, 10:12:39 AM

Thanks for the reply.
The second battery pack that I linked has a nominal/typical voltage of 51.2 and a charge cut off voltage of 61.4.

Does this mean when it is fully loaded it will be at 61.4 volts- which could/will blow my internal controllers?

Title: Re: Battery upgrade
Post by: Lazyrider on November 18, 2013, 03:15:23 PM

Ended up buying a 20ah one with the same connectors as GM use so I can swap them over(or should I wire them in parallel?).
I also got a battery carrier rack designed for multiple battery's that I am going to modify to fit the giant ucan-2.0 fully suspended frame.