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.
Sooner or later you will forget to watch and oops. At least you need a good LVC.
Be the pack leader.
36 volt sla schwinn beach cruiser
36 volt lifepo4 mongoose mtb
24 volt sla + nicad EV Global
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
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
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
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
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