MC4 Cable Length

Hi all,

Newbie here. Setting up basic system (guided by professor Will) to power downstairs 18 cu ft fridge. I may end up having a long run (100-130 ft) from Panels (4 100 Watt) to charge controller. Been exploring going with 8 AWG MC4 cables (as opposed to standard 10AWG), but not sure if they will fit in charge controller?? Also, can't really determine if 8 AWG MC4 connectors (in packs like 10 AWG would come in) actually exist? Any help appreciated!

8 gauge MC4 does exist. That is a long run. For example, if you were to try to pull 30 amps 130' at 12 volts you would lose about 46% of your power heating up your wires. Not going to work. If possible I would run the panels in series but that depends on what input voltage your charge controller can handle. What is the maximum input voltage of your charge controller and what is the VOC (volts open circuit) of your panels? What is the battery/inverter voltage?

Here's a wire sizing chart to get you started. Some other considerations: Series or parallel wiring for your panels, using batteries? Is the fridge AC/DC? Do you need an inverter? How cold will the wires get?

Many thanks to both responses. LOL, will take days for me to research your questions, but that's what I thought. As I said, I'm a newbie. Thanks again to you both for saving me money before I proceed!!!

Answering one question at a time takes you closer to creating your own system. Good luck and don't be afraid to ask. That's why this forum is here!

You asked before you bought, so you are ahead of the game already.

If it is necessary to locate the solar panels away from the CC ( charge controller) and inverter then you want to use as high a voltage as you can to minimize losses and hence the gauge of wire you need. Start by looking at charge controllers and what their maximum solar input voltage is. Then look at panels and take note of their VOC. If you connect panels in series the voltage adds but the amperage remains the same. Once you find some possibilities, come as more questions!

Thank You! Consider my self "well-read" at this point, but still lots to learn. Great hobby to take on in the midst of this COVID-19 situation. Gonna start small. I am going with 8 AWG wire as it fits in the charge controller I purchased. Panels will be approx 50 ft away. Stay healthy all!