Long range lithium conversion

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mattcarr
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Location: Hampshire

Re: Long range lithium conversion

Postby mattcarr » Mon Jun 11, 2012 7:00 pm

I have to say that I would be very interested to see what sort of real world range you do get on a single charge - but have to admit that doing a single drive to see what it is would not be that exciting with such a large battery pack !!!!!

Beemer
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Joined: Sat Jun 04, 2011 12:10 pm

Re: Long range lithium conversion

Postby Beemer » Mon Jun 11, 2012 9:08 pm

Errata, bad English, made clear.

Beemer wrote:
timpootle wrote:Your speculation on lightening my pack is valid , but I am not changing the design spec until I have done at least one full length journey, just to see what it will do.

If you don't see how it runs on the full pack I'm not sure anyone here will forgive you. :lol:

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timpootle
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Re: Long range lithium conversion

Postby timpootle » Mon Jun 25, 2012 7:19 pm

Van is charging!!!!

I fitted a mains relay in the HiPower BC3 charger operated by a 12v signal from the Guantuo BMS to cut off at my trigger voltage (set at 3.45v for testing. 3.85v when I'm confident and need a full pack.) It hasn't got there yet, so I am waiting to test my relay.

All very exciting! It's charging with 9A output, about 2kW input (I will attach my power meter soon to check.)

The BMS is powered by a 12v SwitchMode pwer supply from RS (like a laptop charger) so I don't need the ignition on while charging. This is what Russ Sciville did in his Elise - I have copied his whole BMS set-up. I tapped the 12v relay feed from the same supply.
Tim Crumpton

Beemer
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Re: Long range lithium conversion

Postby Beemer » Mon Jun 25, 2012 7:33 pm

Hey! Each new step, that one that extra high. ;)

Congrats Tim.

IT LIVES!

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MaryRCrumpton
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Re: Long range lithium conversion

Postby MaryRCrumpton » Mon Jun 25, 2012 8:19 pm

timpootle wrote:Van is charging!!!! ...

All very exciting! It's charging with....


Yay! :D

So proud of my fabby fiancé.

Mary x
BVS North-West Coordinator, based in Manchester.
Contact via Text/Phone on 07751 696 055

Beemer
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Joined: Sat Jun 04, 2011 12:10 pm

Re: Long range lithium conversion

Postby Beemer » Mon Jun 25, 2012 8:28 pm

MaryRPerkins wrote:
timpootle wrote:Van is charging!!!! ...

All very exciting! It's charging with....


Yay! :D

So proud of my fabby fiancé.

Mary x

Off somewhere nice this weekend? 8)

mattcarr
Posts: 389
Joined: Sat May 12, 2007 2:27 pm
Location: Hampshire

Re: Long range lithium conversion

Postby mattcarr » Tue Jun 26, 2012 7:51 am

On a charge at last !!!!. I hope that you notice that the batteries behave better after having a charge. I notice that if I dont charge my pack over night the following day the pack voltage is a bit softer under load.

What make are your batteries? Are they Thundersky?

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timpootle
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Re: Long range lithium conversion

Postby timpootle » Tue Jun 26, 2012 8:24 am

Thanks Matt, and Andy.

My cells are HiPower 200Ah prismatic, rated at C/3=66Amp continuous. I have 3 in parallel so I can draw 200Amps without worry, and charge at that speed too if I get a charger and supply big enough.

Slowly slow.
Tim Crumpton

mattcarr
Posts: 389
Joined: Sat May 12, 2007 2:27 pm
Location: Hampshire

Re: Long range lithium conversion

Postby mattcarr » Thu Jun 28, 2012 6:38 pm

Are you still on charge??? Did giving the pack make any change the the voltage under load at all?

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timpootle
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Re: Long range lithium conversion

Postby timpootle » Thu Jun 28, 2012 10:22 pm

I haven't reached cut-off yet. I unplugged it at 11pm last night- don't want it overcharging if my relay fails, so I need to be awake for its first cut-off.

The pack seems to balance itself nicely. The biggest delta was 3.25-3.33 as the first cells came up, but then the high ones held at 3.33V while the slower ones caught up, and my 3.340V warning tone never sounded after 12 hours of charging! Still to be tested.
Tim Crumpton


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