expresso wrote:Connectors i received - too bad i feel they are too thin to use - i may be wrong ?
expresso wrote:i will post more pictures as i go along but to be honest it wont be much difference than my previous 60ah built - same thing only larger Cells this time - thinner but taller - and 80ah !!!
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expresso wrote:anyone who wants to make an ADD ON to use with Lead - should at least use one diode inline to get the best range. only use a diode if you are combing lithium with lead - if all lithium - no need for one.
shirley_hkg wrote: One way to ease your worry about over-stressing a low C add-on is to put a diode in its discharge path .
-0.6V will match the discharge platform of MK gel perfectly .
Didn't you hear BM mentioned before ?
Burgerman wrote:In a perfect world. the addon would be the same voltage as the lead. But its slightly higher. So as you drive the first 1/3rd of your miles come ONLY from the addon. It takes all the load. So lets say you have 60mile range.
After 20 miles, the lead is still 100% full. The addon is half discharged.
After 40 miles, the lithium is about 80% used, and the lead about 20...
Keep going and you run the lithium too low, and the lead still has some remaining but you must stop.
Add a high power low resistance low voltage drop forward diode, with around a .25V approx drop. Now the lithium is used less, the lead more, by around 15 to 20%. SAdd 2 and you will use all the lead, and may have some lithium left. Ideally you need somewhere between the two. Expresso is experimenting to see what works best. 1 or 2 of those diodes.
Scooterman wrote:expresso wrote:i will post more pictures as i go along but to be honest it wont be much difference than my previous 60ah built - same thing only larger Cells this time - thinner but taller - and 80ah !!!
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I'm really interested in this build Expresso, so if you can detail each step I for one would really appreciate it .
As well as the physical build can you detail the non-physical initial charging, voltage graphs, etc, for people like me who've never done lithium before but plan to, and using prismatic cells. (for me not an add-on but a lead replacement on my road mob scooter)
shirley_hkg wrote:That copper connector can handle a thousand amp . Don't worry .
Add teeth lock washer as cushion . Apply Loctite and don't over-tighten it.
Scooterman wrote:expresso wrote:i will post more pictures as i go along but to be honest it wont be much difference than my previous 60ah built - same thing only larger Cells this time - thinner but taller - and 80ah !!!
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I'm really interested in this build Expresso, so if you can detail each step I for one would really appreciate it .
As well as the physical build can you detail the non-physical initial charging, voltage graphs, etc, for people like me who've never done lithium before but plan to, and using prismatic cells. (for me not an add-on but a lead replacement on my road mob scooter)
Burgerman wrote:because a resistor drops zero volts at all at no current. A little bit at light current. And so much at high current you dont move. In other words its got too much resistance to drive anything. Or its got so little it drops nothing. We need a constant small voltage drop, almost regardless of load. Which the right diode provides.
Burgerman wrote:Still think 2 diodes MAY be a bit much. But if so, easy to remove 1 with tools! Do those bus bars allow room for cell insulation?
Burgerman wrote:If you can use 2 then it will work instead of washers...
Burgerman wrote:Its a case of being there and testing!
Burgerman wrote:After she stops, or gets home with say a couple of oranges, you will get about 40Ah back into the MKs, since thats all they really allow you to take out. And then see how low the lithium is. Try it with 1 and 2 mosfets. 2 is safe, she just may hit a red light, before using up all the lithium Your PL8 will tell you.
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