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hello all
just wanted to tell everyone about our situation. and/how hi power and the electric car co made everything right.
my name is kevin from topeka electric motor, we have showed you our 2000 s10 truck. topekaelectricmotor.com this is were it can be viewed.
we have 48 cells 200 amphr. with reap bms.
shortly after we had the truck running our bms found that we had some weak cells, these cells wouldnt hold the same substainable charge, we made 3 long test runs to try to get over the 100 mile mark, the batteries all performed exactly,the same to about 75miles. and then you could watch the voltage levels lowering considerably faster on these cells than the other cells. we had 10 cells showing these signs. you could put the truck on the charger and these 10 cells would come back to the correct voltage and all 48 cells would end up .030 volts from highest to lowest. like i said we did this test 3 times, loging voltages per cells and total volts per mile. aslong as you only drove less than 70 miles and then recharged, the cells performed exactly the same,you wouldnt of know there was a problem, until you went over that range and you then had these lower cell issues. without a good bms it would be hard to find and prove these issues.
hi power batteries say they have a 2 year warranty, well after all the documention and proof, we had 48 new cells show up at our shop today. we will be installing them this weekend.

big thanks to carl clark (electric car co ) and hi power batteries. stand up companies are hard to find these days.

thanks kevin
 

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Great story! I have bought several things from Carl and have been happy. Here's his web site:

http://www.evequipmentsupply.com

BTW motor guy whats the max Amps you could pull from those CHP 200 Ahr batteries, and for how long? I bought a couple that I'm going to torture test after I'm done torture testing the 10 Ahr cylindrical cells.
hello all
just wanted to tell everyone about our situation. and/how hi power and the electric car co made everything right.
my name is kevin from topeka electric motor, we have showed you our 2000 s10 truck. topekaelectricmotor.com this is were it can be viewed.
we have 48 cells 200 amphr. with reap bms.
shortly after we had the truck running our bms found that we had some weak cells, these cells wouldnt hold the same substainable charge, we made 3 long test runs to try to get over the 100 mile mark, the batteries all performed exactly,the same to about 75miles. and then you could watch the voltage levels lowering considerably faster on these cells than the other cells. we had 10 cells showing these signs. you could put the truck on the charger and these 10 cells would come back to the correct voltage and all 48 cells would end up .030 volts from highest to lowest. like i said we did this test 3 times, loging voltages per cells and total volts per mile. aslong as you only drove less than 70 miles and then recharged, the cells performed exactly the same,you wouldnt of know there was a problem, until you went over that range and you then had these lower cell issues. without a good bms it would be hard to find and prove these issues.
hi power batteries say they have a 2 year warranty, well after all the documention and proof, we had 48 new cells show up at our shop today. we will be installing them this weekend.

big thanks to carl clark (electric car co ) and hi power batteries. stand up companies are hard to find these days.

thanks kevin
 

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Discussion Starter #3
thanks david

carl has told me about your car, sounds real neat. also tell him you want a copy of the video of our truck he made up.
let me know how the torture test works out.

maybe i am just over stimulated, about our new ac motor but i think there are going to be some big gains made in the ev world in the next few months from all who develope the new ideas.

thanks kevin
 

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hello all
just wanted to tell everyone about our situation. and/how hi power and the electric car co made everything right.
my name is kevin from topeka electric motor, we have showed you our 2000 s10 truck. topekaelectricmotor.com this is were it can be viewed.
we have 48 cells 200 amphr. with reap bms.
shortly after we had the truck running our bms found that we had some weak cells, these cells wouldnt hold the same substainable charge, we made 3 long test runs to try to get over the 100 mile mark, the batteries all performed exactly,the same to about 75miles. and then you could watch the voltage levels lowering considerably faster on these cells than the other cells. we had 10 cells showing these signs. you could put the truck on the charger and these 10 cells would come back to the correct voltage and all 48 cells would end up .030 volts from highest to lowest. like i said we did this test 3 times, loging voltages per cells and total volts per mile. aslong as you only drove less than 70 miles and then recharged, the cells performed exactly the same,you wouldnt of know there was a problem, until you went over that range and you then had these lower cell issues. without a good bms it would be hard to find and prove these issues.
hi power batteries say they have a 2 year warranty, well after all the documention and proof, we had 48 new cells show up at our shop today. we will be installing them this weekend.

big thanks to carl clark (electric car co ) and hi power batteries. stand up companies are hard to find these days.

thanks kevin
Hi Kevin,
48 cells of 200 Ah is 30720whr. To cover 100 miles you would have to run with an efficiency of 307 wh/mile. That's a lofty goal for an S10 truck. Did you check any of the 10 weaker cells to see how many Ah they were capable of discharging? Most people with this kind of vehicle would be happy with 400 wh/mile...which would give you about 76 miles. Perhaps the weak cells aren't too far off the actual 200 Ah rating???

Cheers,
 

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Discussion Starter #5
we have alost gone 100 miles, like we have stated 95.5 miles is our best to date. no cigar yet.
the good effiency, i think is all beause we use the 5 speed transmission to stay in the warp 9's best power range, you will soon figure out the amps per mph to achieve the best range.
one item i find very interesting is that on slave #2, cell's 9,10,12 will drop their voltage around the 85 mile range to about 2.5 vdc,while cell #11 is still above 3.0 vdc. when this happened the first time we took a vom meter and check all the battery voltage to make sure the bms wasnt giving us bogus readings. our batteries are all series connected.
we had to answer alot of questions and send lots of data to prove there was an issue to hi power, i am so glad we bought a good battery management system that can supply you with that kinda data.
that was a good lesson learned.

thanks kevin
 

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I'm just thinking that perhaps your weaker cells still have 200 Ah and the rest have more? Can you test one of them? (for what you paid for that BMS...you could have bought another small pack of batteries! lol):p
 

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Let me also point out an easy way to know your cell capacity is to bottom balance your pack. Once you have them all discharged to the same SOC you monitor them when charging. When the voltage starts to shoot up on the first one, (around 3.50 for SE/CALB), you know it's reaching full and you know it's your smallest capacity cell. Using an amp hour meter you know how many amp hours went into it. Also, my SE/CALB cells all came with a data sheet listing actual capacity and resistance for each cell, tested at the factory. I guess HiPower doesn't do the same? You can also use a $30 Cell Log 8 to log 8 cells at a time to see how they behave under load.
 

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Good to know that Hipower honored their warranty. 100 miles out of a battery that size in that type of vehicle is impressive.
 

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Very true David.... impressive indeed. It's ironic when u think about it.... "we" are all worried about the Chinese battery manufacturers and dealers screwing us ... and the only ones I've seen screwed are from here! lol.

I can't see them (Chinese battery guys) screwing folks and expecting to do more business. Can you??? If I recall David, you stuck your neck out and ordered batteries from a vendor that was little known and had them shipped direct.... yes?
 

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Correct, although I carried out testing on a 12.8V sample first to try and verify the reserve capacity and High current draw (although I was only able to do a rough test of 3C @ 10 seconds). So far the battery has performed well, but with only about 2000 kilometers on all electric, it doesn't say much.

The company that sold my batteries was an interesting one because they carried every kind you could imagine. LiFePO4 was the most obvious but they also had NiCad, NiMH, and NiFE among a long list of others among in and lithium varieties.

What gives me some reason to celebrate is that Kevin's battery is a carbon copy of mine in terms of rated capacity AND system voltage.
 

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Correct, although I carried out testing on a 12.8V sample first to try and verify the reserve capacity and High current draw (although I was only able to do a rough test of 3C @ 10 seconds). So far the battery has performed well, but with only about 2000 kilometers on all electric, it doesn't say much.

The company that sold my batteries was an interesting one because they carried every kind you could imagine. LiFePO4 was the most obvious but they also had NiCad, NiMH, and NiFE among a long list of others among in and lithium varieties.

What gives me some reason to celebrate is that Kevin's battery is a carbon copy of mine in terms of rated capacity AND system voltage.
If I may inquire....what was it that convinced you to send your $$ in advance of having product? Was there any particular thing?.... No other buyers to praise them? or... a revelation moment of some kind
 

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What I did wasn't completely without precedent at the time. Back then I had already looked at conversions using thundersky LiFePO4 cells that had a few years on them and I took the time to contact some directly to ask how they were performing. No one that I found had anything bad to say about them.

TS is of course a different company, but the chemistry is the same and after I received a sample that worked as they claimed, I felt "less uncomfortable" about buying something like this. They also answered all my questions and when I plotted my measured discharge curve to compare it to their plot it was a perfect match. I sensed there was also a realization on behalf of many chinese companies that they had to overcome much of the bad wrap that TS placed on all of them a few years ago when a large group buy of lithium batteries turned sour and they didn't perform as advertised. This was before TS introduced the current gold standard LiFePO4 series.

The chinese are slowly starting to embrace western 3rd party payment methods like credit cards and paypal or equivalent so a direct wire transfer is becoming obsolete (thankfully). Are they better than thundersky or sky energy? I have no idea. There simply aren't enough miles on my car to say for sure.
 

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Discussion Starter #13
hello all, just wanted to say our new batteries are installed and must say we are very happy.


thanks
kevin
topeka elctric motor
 

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If I may inquire....what was it that convinced you to send your $$ in advance of having product? Was there any particular thing?.... No other buyers to praise them? or... a revelation moment of some kind
I have a friend who installed Hipower 300V100Ah battery pack, he had put 496 miles on the pack for one charging.
 

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One of my customer in Germany, he convert Porsche, here is her car data:

Porsche 912
2 + 2 seater
electric motor: 72KW / 350Nm
Gearbox: 5 speed
battery: HIPOWER 40S2P / 128V / 200AH / 25,6KWH
weight: 1150Kg inclusive batteries
max. speed: 165KPH with two passengers
cruising speed: 120KPH
range: 200+ Km at 100KPH with two passengers

Here is his car
2010-11-29_160606.jpg
 

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One of my customer in Germany, he convert Porsche, here is her car data:

Porsche 912
2 + 2 seater
electric motor: 72KW / 350Nm
Gearbox: 5 speed
battery: HIPOWER 40S2P / 128V / 200AH / 25,6KWH
weight: 1150Kg inclusive batteries
max. speed: 165KPH with two passengers
cruising speed: 120KPH
range: 200+ Km at 100KPH with two passengers

Here is his car
View attachment 8569
Those numbers are a little more realistic... not many cars could get 125 wh/kilometer (205 wh/mile) at 100 kph.... ??? Nice looking ride though!
 

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I have a friend who installed Hipower 300V100Ah battery pack, he had put 496 miles on the pack for one charging.
your "friend" is leading you down the garden path... this is not technically possible. This is your second post here.... are you spamming?

edit.....I see that you are a rep for Hi Power batteries. You may not realize it, but you have just done some damage to your companies' reputation....
 

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your "friend" is leading you down the garden path... this is not technically possible. This is your second post here.... are you spamming?

edit.....I see that you are a rep for Hi Power batteries. You may not realize it, but you have just done some damage to your companies' reputation....
yes, I am a rep, from Hipower, my name is Candy, my friend from USA, who has 25 years experience for batteries. in 2008, he bought 300V100Ah battery pack, but because our equlizer charger damage most of the cells, then this year we make replacement for the whole pack, now he is very happy for the Hipower upgrading cells . you can check the original Email from him as attached. I just want to verify not only one customer speaks highly about Hipower cells. nothing special .

12121.JPG
 

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Looks like a lost in translation thing..

Candy, if you were explaining the differences between the Calb, Thundersky, and Hi-power 100ah cells, what would they be? Why would one buy one above the other?
Thanks
Tom
 

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yes, I am a rep, from Hipower, my name is Candy, my friend from USA, who has 25 years experience for batteries. in 2008, he bought 300V100Ah battery pack, but because our equlizer charger damage most of the cells, then this year we make replacement for the whole pack, now he is very happy for the Hipower upgrading cells . you can check the original Email from him as attached. I just want to verify not only one customer speaks highly about Hipower cells. nothing special .

View attachment 8573
Hi Strawberry Candy,

I think you read this incorrectly.

I have a friend who installed Hipower 300V100Ah battery pack, he had put 496 miles on the pack for one charging.
Or wrote this incorrectly.

I read that attached email as saying he has gone 496 miles on multiple charges of 40 to 50 miles per daily charge. NOT 496 miles on a single charge.

Might be a language thing going on here :)

Regards,

major
 
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