I need to make a long bussbars for my 48 volt system. (1.5 meters).
I wand to use thick copper bar for that.
The bussbars will be connected on dry wood and it will be electricly connected to the wood through the screw.
Both bussbars will be connected this way.
Question: will the isolation of the wood be sufficient or should i somehow isolate the bussbars from the wood?
Best would be to use isolated busbar holder. There are such plastic/rubber isolators on the market. Often used as mechanical absorber, - something like this:
Metall-Gummipuffer Typ 1 (A) einfach bestellen · Z24.de
In addition I would spilt the wood between the (+) and (-) busbar by using two pieces of wood for each busbar one. With that there is no possibility for moisture to somehow connect through the wood.
Mounting on wood can cause problems, if you’re busbar is going to get warm then dont mount on wood (as wood will exzasapate heating) better to use standoffs so you have air circulation under the busbar.
If you do mount on wood ensure the wood is kiln dried or you are sure it is dry as any moisture could effect your connections.
And different bits of wood for positive and negative.
I would use polycarbonate with standoffs but that can be expensive.
All my busbar is in free air and just bolted at the batteries. But better to air on the side of caution in my book.
But what ever you decide to do would love to see some pictures when completed
Thanks.
What i was planning is this:
I was thinking of making a few square blocks of wood.
Width the same as the busbar, hight 2 cm.
Connect then to the plywood wall in my barn with two screws. On the corners of the wooden block. Not in the center.
Then screwing the bussbar on top of this 2 cm high woodblock, using the center of the block (and bar). This way there is no screw going all the way from the bussbar to the plywood wall, generating extra insolation. Also this way the busbar will be ‘floating’ 2cm away from te wall. The bar will not get hot it will be 100mm2 or so. But this way i can easy connect extra things. Just dril a hole in de bar and connect.
I have budget for 2 packs of 16 piece batteries. Totalling in 32 cells and 25 kWh or so.
First i start with one pack of 16 replacing my 4 led acid batteries with LiFePo4.
Way in the future maybe i will expand to 4 packs of 16.
The storage i will be building wil have space for 4 packs.
Thats why the busbars must be long, the batteries will be in a shelf, and if i realy go for 4 sets they will be stacked vertically.
If you are interested: i use a Multiplus II 5000/70 and have jy whole hous connected to it (only the multi and the washer/dryer are directly connected to the grid.
Maybe, if money alowes i will change to the biggest multiplus, or maybe another multi 5000 and put them in paralel. But that is all way in the future.
I have done some investigating in the risks of connecting the busbars to a wooden wall, and are getting more and more confident that there should not be any problem with 48 volt, but am still open for info. Would realy suck if after it is all done i have to exchange the busbar for smaller ones and connecting them with a big wire (i use 70mm2 with M8 connctors everywhere and have no tools to make them so i have to order them the right length every time. Which sucks because for safety i order cables that are allways slightly longer than what i think i need).
Anyway, thanks for the reactions.
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The Metall-Gummipuffer are realy a nice idea.
I have been looking for something like this.
Realy nice.
Thanks