The Grape 15 foot Extension Cable MC4 connectors are universal and common to industry-wide solar products produced after about 2011. They are usually not used at the charge controller or conventional disconnect switches which have their own enclosure weather standards. A 6 inch MC4 to Bare Conversion Cable Pair is available to make the transition once out of the solar panel environment or cut a 15 ft Extension cable in half to make a longer conversion to bare pair. The other manufacturer should specify compatibility but they may not meet this standard if older.
You have "grape solar" panels ? ( I presume. ) I have and am using these extension cables and they are excellent.
Yes you will need 2 extensions, a controller, and a battery to store the power generated. it is bare wire hookup at the controller
It depends on the voltages that you’re panels putting out and the voltage your controller uses. You may need to buy the MC4-comparable T-branch connectors to install the panels in parallel. You are only able to do this so many times before overloading the wire, so you may need to make multiple runs to your controller. You can only supply as much as your controller can handle too.
I thought that too when I bought mine. I guess if you are at your final connection you only need the one. That’s the only reason I could come up with. But if you need the go 15’+, you’ll need to buy 2.
Yes, one for the positive post and one for the negative post on your battery. And depending how far your battery is from your panel you might need more cables
It's impossible to answer this question without more details on your system - we'd need to know what kind of panels you have, how they are connected, what your battery voltage is, and what kind of charge controller you are using. Contact Grape Solar for details, or use an online voltage drop calculator and make sure your voltage drop is below 3%.
No the connected different
The extension cable is not free. The delivery of the solar panel is of a 45 dollar or more purchase.