Re: Ang.:[electricboats] Finally Starting The Build

I suppose you could do the safety wire on the terminal studs or nuts on the bus bar between adjacent cells.  Or you could put a hole in the bus bar as the anchor point for the wire.  Care would be required when working with this floppy wire over the battery cell terminals (as it would be working with anything over the cell terminals).   

I have not seen these 6mm studs with holes for wire but if the studs were brass it would be easy enough to drill them with a little jig on a drill press.  Same for the copper buss bars.  





Dan Pfeiffer

 

On 2021-08-22 11:49 pm, Dan Pfeiffer wrote:

How exactly does the safety wire go on the battery terminal studs or nuts?  What does it anchor to?  It cannot go to any other battery terminal because that would be a short. 

Can you give a link to some of the "Tons of info on the 'net on how you do it."

I do safety wire with the set screws on my propeller shaft flanges.  But they are not separate electrical conductors.   There is no concern about short circuits. 


Dan Pfeiffer

On 2021-08-22 9:08 pm, Carsten via groups.io wrote:

I'm all in for brass bolts and nuts !

 

As an aircraft mech (hobby), I would do like this :

If you want all the contact you can get, avoid Loctite and use safety wire (stainless soft wire, not the one from your shelves in your home workshop).

Drill holes in the bolt heads, and follow the general pratices for this kind of work, or you might end up doing worse than doing nothing at all.

Tons of info on the 'net on how you do it.

Remember to buy a safety wire twister, saves a lot of hand work, and the twists looks nicer too.

That will work, and you can always unscrew your bolts without any hazzle.

 

På fre., den 20. aug. 2021 klokken 9:31, Randy Cain

<randylcain@gmail.com> skrev:

Finally starting to build the first of four 32s batteries for my boat. These are EVE 280Ah LiFePO4 prismatics. I ordered 134 of them just as the pandemic was starting. There will be 4 battery banks of 32 cells each (one in each of the two bows and one in each of the two sterns) for a total of around 114kwh of energy storage. Even after 18 months in their boxes, they are all still within +-0.001 volts of each other (3.295) and within +-0.01 milliohms (0.18 mohm internal resistance). Next step is Locktite and torque wrench to set the 40mm grub screw terminal posts.