diy solar

diy solar

Xuba Electronics: DEAL - 280AH LiFePo4 cells. Purchase & Review

Xerxes said:
So here I am on DAY-1 twiddling my thumbs, ........ 54 more days to go!
Click to expand...
It may be less than that. One of my deliveries out of Shanghai took that long but another out of Shenzen was just shy of 40 days. I probably has to do with the frequency of vessel sailings and whether the vessel is making any other stops along the way. Don't be fooled by the FedEx notice. Nothing happens after that until the vessel unloads and your package clears customs and finally actually gets scanned by Fedex.
 
My order from Xuba Electronics is here. 8 cells took 39 days from order/payment to the east coast of Australia, very impressed with that.
Packed 2xCells to a box each cell individually wrapped in foam and foam around the inside of the box.
2 cells are showing some very very slight compression damage on one corner. Nothing I'm concerned about.
In all very happy atm.
Now the fun begins ?.
 
Ok, seems this is the active site for these batteries.... I asked on the "Just Placed an Order..." thread.... I received my batteries and can now see the problem of the busbars being ok side to side, but not end to end.. too short. Anyone know which online site to buy the right sized ones to fit the other way?
Just realized that in a 8s pack, I only need one such end to end busbar, right? That sucks! Hardly worth buying online... is there something at a hardware store? I remember others making their own... smashing copper tubing or something... are there flat pieces at a hardware store to just drill out the one needed? What have others making a 8s pack done? Just one longer busbar... can't believe it... thought it was at least two... .but the other two are the leads... and aren't connected....
Wow,... one longer busbar needed...:censored:
 
gdpetti said:
Ok, seems this is the active site for these batteries.... I asked on the "Just Placed an Order..." thread.... I received my batteries and can now see the problem of the busbars being ok side to side, but not end to end.. too short. Anyone know which online site to buy the right sized ones to fit the other way?
Just realized that in a 8s pack, I only need one such end to end busbar, right? That sucks! Hardly worth buying online... is there something at a hardware store? I remember others making their own... smashing copper tubing or something... are there flat pieces at a hardware store to just drill out the one needed? What have others making a 8s pack done? Just one longer busbar... can't believe it... thought it was at least two... .but the other two are the leads... and aren't connected....
Wow,... one longer busbar needed...:censored:
Click to expand...
You can buy copper flat stock on amazon or mcmasters. Cut to length and drill a few holes and you're set.
 
I have extended bus bars with copper stock and soldering. Not ideal but does work for applications where the bus bars won't exceed the melting temperature of the solder. If possible 4% silver solder is preferred.
 
Does it have to be copper? The busbars they sent out are aluminum, right? Just find a piece of aluminum in the hardware store long enough and drill a couple right sized holes? It's only one piece. I was planning on using the ones they sent out... is that a problem?
 
gdpetti said:
Does it have to be copper?
Click to expand...
I would think that would be fine but aluminum only has a bit more than half the electrical conductivity of copper, so that's why copper is preferred for wires and such. Aluminum is lighter and cheaper, and would eliminate the issue of galvanic corrosion while in contact with the aluminum terminals on top of the EVE cells. Although you still have the question of what metal is in the bolts you use.
 
If you use the bolts they sent out, they are aluminum as well, right? Same as the terminals... all aluminum.
 
gdpetti said:
If you use the bolts they sent out, they are aluminum as well, right? Same as the terminals... all aluminum.
Click to expand...
Aren't the included bolts too long? I thought I saw a picture somewhere. Unless you were using thick bus bars plus lots of terminal rings.

Mine aren't here yet to know for certain. Hopefully later this month. Luckily I've got other parts of my project I can work on in the interim to pass the time, such as the data link between my SBMS and Arduino.
 
sremick said:
Aren't the included bolts too long? I thought I saw a picture somewhere. Unless you were using thick bus bars plus lots of terminal rings.

Mine aren't here yet to know for certain. Hopefully later this month. Luckily I've got other parts of my project I can work on in the interim to pass the time, such as the data link between my SBMS and Arduino.
Click to expand...
I can confirm the bolts are to long.
2x Bus bars and a washer and spring washer will give a snug fit. I think I will go studs.
 
HomeTownHockeyFan said:
A number of folks here (including me) have used these M6x25mm SS set screws with success.
Click to expand...
The problem there is the very high risk of galvanic corrosion when stainless steel and aluminum are in contact with each other. I have zinc-coated bolts of various lengths on order to address this.

www.albanycountyfasteners.com

Stainless Steel & Aluminum: Why You Shouldn't Use Them Together

Why Can’t You Use Stainless Steel and Aluminium Together? What is Galvanic Erosion, how it works and, how to stop it? Read More...
www.albanycountyfasteners.com

What is working for you today might not be in such great shape in the future as the corrosion gradually sets in.
 
Why ask Amy to send out double busbars and screws if no one uses them? I thought the screws were ok with the double busbars, with the additional BMS connections and a lock washer? I'm a newbie, so I just want it done right and hopefully never need to touch it again.
 
gdpetti said:
Why ask Amy to send out double busbars and screws if no one uses them? I thought the screws were ok with the double busbars, with the additional BMS connections and a lock washer? I'm a newbie, so I just want it done right and hopefully never need to touch it again.
Click to expand...
I think more people use them than not. I just don't feel it's wise. :) The more I learned the more I decided that hard busbars were a really bad idea for a mobile setup so I'm going with braided busbars and zinc-plated bolts. I'm also using some anti-corrosion coatings and compounds to also help things.
 
Well, I'll be using them in a 'mobile' situation as well, a campervan buildout, so I'd like to do it the 'right way' for that situation, but it's not like I can go to Walmart and pick this stuff up, right? Is any of it available on Amazon? Is the supplied free aluminum busbars and screws the wrong way to go? I can understand the desired flexible ones for 'mobile' use....
 
sremick said:
The problem there is the very high risk of galvanic corrosion when stainless steel and aluminum are in contact with each other. I have zinc-coated bolts of various lengths on order to address this.

www.albanycountyfasteners.com

Stainless Steel & Aluminum: Why You Shouldn't Use Them Together

Why Can’t You Use Stainless Steel and Aluminium Together? What is Galvanic Erosion, how it works and, how to stop it? Read More...
www.albanycountyfasteners.com

What is working for you today might not be in such great shape in the future as the corrosion gradually sets in.
Click to expand...
That's a fair call that and was thinking about this not long ago.
What if I used enough loctite to form a seal to prevent any electrolyte getting in.
 
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