Help, advice required on my LIPO purchase

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whereswally606   100 kW

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Help, advice required on my LIPO purchase

Post by whereswally606 » Jan 14 2012 8:39am

Dear All

Ive just taken delivery on my zippy flightmax 40c 3s 4AH cells, 16 of them. I did some checking of the cell voltages using the cell log that I bought on the same order. as well as this to take advantage of the delivery weight I bought a small turnigy 2/3s charger, and 2 packs of the HK bullet connectors to wire up the whole pack.

So my plan is to run 2 packs of 12s2p ie 8aH packs as I have two norco builds on the make. I would also like to be able to be able to combo the packs onto the same bike and choose whether to take 1,2,3 or 4 p ie 4,8,12,or 16AHs with me.

To charge the packs ive bought a hyperion 1410i and i plan to use 2 server supplies which are 12v 20a continuous rating so should be able to do 12s balance charging of all 4 sub packs.

anyway this is all hypothetical as my ebike experience so far is all with lifeP04 on my scott ransom build which is plug and play pretty much.

here is the first spread sheet of the voltages so far.
ebike voltages.JPG
ebike voltages.JPG (35.38 KiB) Viewed 304 times
when i come to build the sub packs (4AH 12s) id like to have the option to monitor each pack using one cell log by a switch to change the balance wire attachments to the cell log. That way ill know which cell is underperforming quickly and be able to isolate that pack first. Overall pack condition is going to be monitored by a GT power analyser wired between the pack out and the controller ( a LVC adapted 72v hua tong to run at 48v)

hope this all makes sense, now can I have a few expert eyes tell me If my voltages are what they need to be.
Thanks in advance Andy
Distributing "Lebowski" FOC Controller PCB (Through hole) since 2016
Moped: Emax 110s 2009

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GrayKard   10 kW

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Re: Help, advice required on my LIPO purchase

Post by GrayKard » Jan 14 2012 11:24am

I'm a lipo noob but what catches my eye is the third cell in pack ten being a tenth of a volt lower then the other two. That's one I would watch. Might be nothing but worth monitoring.

Gary

whereswally606   100 kW

100 kW
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Joined: Jun 19 2011 2:11pm
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Re: Help, advice required on my LIPO purchase

Post by whereswally606 » Jan 14 2012 12:50pm

yeah that stuck out for me too, have labelled all packs with their number when i tested them so will be able to provide a log of every cells voltage.
Thanks graykard
Distributing "Lebowski" FOC Controller PCB (Through hole) since 2016
Moped: Emax 110s 2009

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dogman dan   100 GW

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Re: Help, advice required on my LIPO purchase

Post by dogman dan » Jan 14 2012 5:19pm

Chances are, the lazy cell on pack ten will perk up after a cycle or two. A low capacity cell will be the one who charges too fast when charging, and ends up lowest at the end of a ride.

I don't see any red flags yet.

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