lenghening pv cables?

[Colin33]

Due to a change of inverter location I need to lengthen some 4mm dc cables. These are run in plastic flexi conduit. No space for adding mc4 connectors and a junction box or dc switch would be difficult. Is it acceptable to crimp a butt joint and double heat-wrap over the joints? Each one will be staggered so separated from each other, and kept neatly within the flexi conduit. Any thoughts anyone?

 

[telectrix]

should be OK. alternative is to solder then heatshrink

 

[Colin33]

should be OK. alternative is to solder then heatshrink

Thanks, I think the crimp connection would be reliable enough, I just wasn't sure if there was any specific rule against this method of joining, given the thickness of the insulation on pv dc cables ...

 

[JD6400]

How much extra length are you adding ?

 

[Colin33]

How much extra length are you adding ?

About two meters..

 

[JD6400]

I only asked for volt drop , but I think you will be ok on that one !?

 

[James]

I only asked for volt drop , but I think you will be ok on that one !?

I think you are being presumptuous, without doing the calculations how do you know?
that extra 0.25v might make all the difference!!

 

[Zerax]

About two meters..

For DC, it's there and back distance... so is that really 4 metres ?

 

[James]

For DC, it's there and back distance... so is that really 4 metres ?

same for AC unless my brain has become fogged with beer??