[DIYguy]

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,

 

[DIYguy]

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)

 

[DIYguy]

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?

 

[DIYguy]

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

 

[DIYguy]

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!

 

[DIYguy]

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....

 

[DIYguy]

Yup, all good. Thanks guys. Sorry Candy...was just the wording there.

Cheers.

 

[DIYguy]

Hey Dex, how are those Blackhawk Li batts working out for you? .... and do u use the heating wires on 110 VAC only?

Cheers,