Thundersky w/ monitoring only?

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reikiman
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Thundersky w/ monitoring only?

In http://visforvoltage.org/forum/4325-kasea-ze2000-battery-replacement#comment-24914 Matt described his battery setup using thundersky batteries and what I assume is thundersky's BMS...

He said it's important to ensure to not over charge or over discharge .. sure. I've been pondering whether it might be sufficient to have a good battery monitoring system without the rest of the BMS. The thundersky BMS is expensive but the paktrakr comes in a form which works with Li-ION batteries and it is an excellent per-cell monitoring system. With the paktrakr you can easily watch pack voltage and/or cell voltage and see if the cells are out of balance or if the voltage is going low.

dogman
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Re: Thundersky w/ monitoring only?

Sooner or later you will forget to watch and oops. At least you need a good LVC.

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antiscab
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Re: Thundersky w/ monitoring only?

Just a bit of clarification,
The BMS im using isnt made by thundersky, only the cells are.
The BMS i sourced from a 3rd party (who happens to deal in thundersky batteries):
www.evpower.com.au

I dont have any experience with the BMS thundersky offers.

A note with using the Paktrakr, it has a permanent 0.009A load on the first 3 batteries of every 8 string unit.
This pulls the pack out of balance by 0.2AH per day.
If your BMS cant keep up with this, then you will encounter problems.

Matt

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah in July 2010. Done 194'000km

fisher727
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Re: Thundersky w/ monitoring only?

I had Thundersky and evpower price a bms unit for 50 lithium batteries of 90 amp hours to be put in a car. They both want a lot of money for the system $1725 for thundersky and $1418 for evpower. How much was you system from evpower.

Eric Fisher
www.SiliconeBatteriesUSA.com

antiscab
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Re: Thundersky w/ monitoring only?

Hi Eric,

the BMS for my car set me back around $2700 for my 90 x 90AH cells.
the BMS for my scooter set me back $750 for my 15 x 40AH.

Matt

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah in July 2010. Done 194'000km

fisher727
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Re: Thundersky w/ monitoring only?

Are the BMS systems both from evpower.
By the way what type of car do you have I have a Force Solectria and it would need I guess 50x90AH cells.
I am trying to get a large purchase order together in an at cost arrangement thought my battery company for the thunder-sky batteries.

Eric Fisher
www.SiliconeBatteriesUSA.com

antiscab
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Re: Thundersky w/ monitoring only?

Hi Eric,

im converting a 1987 toyota mr2.
i wanted it to be reasonably fast (0-60mph in 7sec or less), and the only way to do that with thunderskys is to have a really big pack.
I have a friend who has a 240v (75 cells) 200AH pack in his ute, and thats fairly powerful (0-60mph in 6sec).

Yes the BMS for both my bike and my car are from evpower.

Matt

EDIT: misread the question the 1st time round.

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah in July 2010. Done 194'000km

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