12s lipo for 48v 1000w esc

[Donie]

Hi guys,

I have purchased a 48v ebike conversion kit from ebay (just a generic Chinese one) hoping that it would go well with some batteries that I currently own. A pair of HK 6s 12ah that I plan on putting in series. Is there any way to tell what the low voltage cut off of the esc is or is or do I just need to run it down until it stops?

I am hoping it is not too high because I am a little under powered with a 12s setup.

If it is, is there any easy way to lower the lvc?

Any advice or experience with similar experiences would be great, thanks guys

 

[dogman dan]

Test by running it, till you reach what you think should be your stopping point for your 12s pack, or the controller stops it. Controller lvc will feel like on off on off, as your voltage under load drops it, then when it stops, your battery rebounds and it starts to run again.

It should hit lvc somewhere around 42v typically. stop by 40v, resting voltage. I would not say you need to lower it for lipo. Likely you want to stop by about 3.6v per cell resting, so 3.5v under load (42v) should work fine for you.

 

[motomech]

D.man is exactly right in regards to the 42 V LVC and not going below 3.6V/cell.
LiPoly 12S, while slight less avg. resting Voltage than other chemistries(44V vs. 48V), it is just as powerful, or maybe more powerful depending to the discharge rate. This is because LiPoly has a more linear discharge curve and less sag. 48V's of, say Li-Ion, will get 1 to 2 more mph of top speedm but LiPoly will feel more powerful has it goes down the dischrge curve.
One of the advantages of LiPoly is it's smaller and lighter form factor. While 12 Ah is pretty good, a pack of greater capacity will have almost no sag and you won't have to run down so low, or charge that high, extending the service life of the pack. The LVC should be a safegaurd, you should really get down so far that you get close. I run 25 Ah of LiPoly, which is good for 40 to 50 miles, way more than I use on most rides. So I only charge to 4.00V to 4,10V and never get below 3.75V to 3.8V Most of the time, i get 2 or 3 rides to a charge.
I have been running 12S for 7 years and have learned alot(some of it the hard way). You should search my posts w/ the key words Lipo or LiPoly. Especially how I have learned not to use RC balance chargers and not "break the pack" to charge. I bulk charge and have got it down to almost a "plug and Play" procedure.