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Fuse & Cable size


Jay-Dee
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18 hours ago, Jay-Dee said:

Can someone recommend what fuse size and cable size I should be looking at?

Some may disagree, but I would go for 70mm or 2/0AWG cable and 200A/250A fuses. Also make sure the lugs are well crimped. 
The cables and fuses are the weakest link in the system, so make sure that link is good. 😉

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20 minutes ago, Solaris said:

Some may disagree, but I would go for 70mm or 2/0AWG cable and 200A/250A fuses. Also make sure the lugs are well crimped. 
The cables and fuses are the weakest link in the system, so make sure that link is good. 😉

Thank you, really appreciate... I see you are erring on the side of caution with the batteries discharging at 100A each / 200A collectively which is way above my inverter spec. This was my thinking from a safety point too. Thank you for confirming

 

Quick question now... Does it make a difference going for 2x 35mm cables or 1x 70mm ... 35mm is a lot easier to come by and I have the crimper already. 70mm, I need to special order and have made. Any suggestions on where to do so, online or in Cape Town would be great.

 

Thanks in advance.

 

 

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3 minutes ago, Vassen said:

As long as both cables are the same lengths and diameter it should be fine to parallel them. If they are not the same, then the resistance of each cable will be different which means the current on each will also differ which creates issues 

Thank you. I am aiming for 1x 70mm cable but will make my own 35mm if I dont come right

 

Thanks again

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1 hour ago, Jay-Dee said:

Thank you, really appreciate... I see you are erring on the side of caution with the batteries discharging at 100A each / 200A collectively which is way above my inverter spec. This was my thinking from a safety point too. Thank you for confirming

 

I used to think that going according to my inverter specs is the best way to “size” my cables. Then I started to think to myself: “ What if my inverter packs up?” I would certainly go for a bigger one next time. And when I replaced the inverter with a bigger one, I would have to get bigger cables. So went big cables and big fuses from the beginning. 
 

1 hour ago, Jay-Dee said:

Quick question now... Does it make a difference going for 2x 35mm cables or 1x 70mm ... 35mm is a lot easier to come by and I have the crimper already. 70mm, I need to special order and have made. Any suggestions on where to do so, online or in Cape Town would be great.

It doesn’t make a difference if you do 2 x 35mm or 1 x 70mm. For me personally I prefer having just one 70mm as it looks neater to me,  this is just my personal preference.

 

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2 minutes ago, Solaris said:

I used to think that going according to my inverter specs is the best way to “size” my cables. Then I started to think to myself: “ What if my inverter packs up?” I would certainly go for a bigger one next time. And when I replaced the inverter with a bigger one, I would have to get bigger cables. So went big cables and big fuses from the beginning. 

100%... my other concern is while the inverter is limited, if something goes belly up and it shorts.. I dont want the weakest link to be my battery cables

3 minutes ago, Solaris said:

It doesn’t make a difference if you do 2 x 35mm or 1 x 70mm. For me personally I prefer having just one 70mm as it looks neater to me,  this is just my personal preference.

Agree... Think I have found 70mm cable, now just need to see if they will cut and crimp it for me

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