pwbset wrote:Very cool! I may have missed it, but where do you get that copper strapping? All I've been able to find locally is plumbers "copper plated" strapping, which I'll use, but wonder about conductivity losses or whatever.
I also saw last weekend a "new" auto shop in the neighboring town that carries old Type II Westys! They are beautiful! Now all I need is a lot of money.
markcycle wrote:I can see that bus burning rubber any day now
Be carefull with 180VDC !!.. we want to keep you alive just 100VDC on my arm kick me strong!!!
Alot of Wh!... eee.. may i should replace with kWh !!!
Lapwing wrote:Yep, anything over 48V needs careful attention. Rubber linemans gloves are not overkill.
oatnet wrote:I emailed Doc and Gary about it. Doc came up with a clever idea for putting hooking the converters in series, charging the whole string with that, as well as connecting the charging wires to each converter with a resistor in series to hold it to 10a.
Gary reported back that since the two current flows are going in the opposite direction, amperage is not cumulative.
So I guess I am back to my original design!
- let supose that you have only two cell and two dc-dc. cell1 with dc-dc1 and cell2 with dc-dc2
- if you charge separatly every cells with their own dc-dc at let say 15A,
every wires will have 15A circulating in them.
now if you connect these combo in serie for 2s1p... that will change nothing right..? ok
now if you only use one common wire for the cell1 and the cell 2 to the dc-dc.. what will happen?
yes... it will have twice current..
PaulM wrote:I'm not sure I agree with this; would it not be possible to charge with the two cells hooked in series, the two converters hooked in series, and no common wire at all?? The common wire is only needed if the cells are not balanced.
Doctorbass wrote:The idea i suggested to you was what you said but you forgot to mention that i said to still use the balancing wire
You did a really great job with the conversion and this forum! I converted a 240sx to electric and need to get the lead out. The car has 1100 lbs of batteries and is not happy. http://vintage-voltage.com/240sx You have inspired me to go for the LiFePo, but I'm concerned sea freight may take 3 - 6 months to get delivered.
Do you remember how much the FedEx shipping cost you? I counted 240 cells in your pack. Did you ship all cells using FedEx? I'd like to talk to you more about your experiences with these cells.
Doctorbass wrote:JD.. This forum ia a very nice place to learn about EV!!
You just can't imagine how many people i refer to our forum!
What is imoprtant is that you correctly understand what we explain.. otherwise it mean we(guru) don't do our job correctly!!
I'm thoroughly impressed (and somewhat jealous. haha!). Great work
SRySwe wrote:I'm impressed!
Maybe it's the overvoltage to the DC-DC converters that causes the heat at charging?
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