Quick question about LIPO vs LIFEPO4

[ebikedelight]

I have been using a 48 volt - 20a/H lifepo4 battery with a LYEN controller which is set at a LVC of 40.

I plan on switching to a 6s - 15000 Mah / 15 a/h lipo ...I will purchase 4 of these and hook them up in series , then parallel to get a lipo pack of 30 a/h and close to 48 volts.

Can I keep my Lyen controller at its current setting, or do I need to reprogram it with a different LVC or HVC ?

 

[Ykick]

I have been using a 48 volt - 20a/H lifepo4 battery with a LYEN controller which is set at a LVC of 40.

I plan on switching to a 6s - 15000 Mah / 15 a/h lipo ...I will purchase 4 of these and hook them up in series , then parallel to get a lipo pack of 30 a/h and close to 48 volts.

Can I keep my Lyen controller at its current setting, or do I need to reprogram it with a different LVC or HVC ?

So you're assembling 12S2P from 4qty 6S bricks? If so, 40V LVC would work out to about 3.33V/cell which is a good choice for that cell count.

Remember, it doesn't mean a weak or duff cell in the string won't drop well below that but as an "average" that's probably pretty good LVC.

 

[ebikedelight]

I have been using a 48 volt - 20a/H lifepo4 battery with a LYEN controller which is set at a LVC of 40.

I plan on switching to a 6s - 15000 Mah / 15 a/h lipo ...I will purchase 4 of these and hook them up in series , then parallel to get a lipo pack of 30 a/h and close to 48 volts.

Can I keep my Lyen controller at its current setting, or do I need to reprogram it with a different LVC or HVC ?

So you're assembling 12S2P from 4qty 6S bricks? If so, 40V LVC would work out to about 3.33V/cell which is a good choice for that cell count.

Remember, it doesn't mean a weak or duff cell in the string won't drop well below that but as an "average" that's probably pretty good LVC.

yes , that was my plan .

I figured if I keep the LVC at 40 volts , it would provide good protection of the cells and the fact that im going from a 20 a/H lifepo4, to a 30 a/h lipo , should result in similar capacity as far as the distance im able to travel when comparing the 2 different battery types ?

I have a balance charger, so I can keep individual cells in check.

 

[friendly1uk]

Pack level protection is for lead. It's also nice to ensure battery capacity remains for lighting, after the motor has been stopped.



I think you will see 50% more range. You may of lost 7.5% of your voltage, but now your top speed requires less power and any other speed is more efficient. I think 50% further will be very close to the truth.

 

[ebikedelight]

Pack level protection is for lead. It's also nice to ensure battery capacity remains for lighting, after the motor has been stopped.



I think you will see 50% more range. You may of lost 7.5% of your voltage, but now your top speed requires less power and any other speed is more efficient. I think 50% further will be very close to the truth.

Really ?

I figured with the loss of voltage from going to lipo from lifepo4 , I would see about the same range , even though the lipo pack is 30 a/h and the lifepo4 was 20 a/h .

 

[friendly1uk]

48v X 20amps(for an hour) = 960 watt hours.
44.4v X 30ah = 1331wh

1332/960= 1.39 times bigger. Your carrying 39% more battery. However you can't nail it as hard, so it will do better.

I really won't be far off with that 50% and I'm sure you can see 39% is definitely on the cards. You simply must do better than 39% further

 

[parabellum]

ebikedelight
You will have about 50% more energy in 75% weight. It is a 200% improvement.

 

[motomech]

40V LVC is a little low.
Currently I use 41 V for my Turnigy 20C, which is a cell LVC of 3.65V.
Below that, my cells start to stay, but it's no big deal, they come back with some extra attention.
40V is safe enough, just not optimal.
Try not to get down to that(Voltmeter?).

 

[parabellum]

CA is a no braier solution. Programable by 2 buttons and a lot of info as a bonus. Have 3 of them, 2 in use, 1 in box, my precious.

 

[dogman dan]

Yes, time to get a CA. Stand alone one will work with any controller, but a Lyens controller should have the DP plug.

You will have more watt hours in the pack. So more range for sure.

Get at least one cellog 8, for checking the packs to see which one needs balancing when. You don't always need to balance the whole pack, just the section that needs it. You'll learn which pack has the weakest cell after some watching.

Figure to stop early enough most of the time, based on your CA pack voltage. If your pack is even half ass balanced, and you stop at 3.5v per cell average, you should never get any cell dangerously low. But your pack will stay better balanced if your typical ride stops more like 3.65v.