Solar MC4 connectors - needed? Why?

bpounds wrote:
I see the MC4 connectors and combiners are commonly used, and I wonder why, and if there is a reason why I could not just solder and seal the conductors between panels, and even between the array and the leads down to the controller. It doesn't seem like a common thing to have to replace a panel. At least not common enough that you would need a quick disconnect. I understand the connectors also make it idiot proof as far as polarity, but so what?

The MC4 connectors are cheap enough, so that's not an issue, but it just seems like a lot of fooling around with pins and housings, for no benefit.

Starting from the end... MC4 are not "cheap", but essentially free (to you). Panels of RV size come with MC4, 99% of them. So, the real question is - are there any benefits in removing them.

For most people there isn't any. Like Time2roll said, MC4 are plug and play. Works well for either series or parallel wiring. You would have to cut them off for junction box, IF you decide to have J-box. Unless you go for a big array made of 12V panels in parallel (a rare situation these days), you don't need a J-box.

Leads from panels to controller is a different matter. Most people use MC4 extension cable for convenience. You cut it in half, MC4 connect to MC4 on the panels, and bare ends go to controller. You could cut MC4 off and solder this lead to the panels, but there is usually reason.