First off, I know this is probably covered in the "Small DIY, Camping/Power Outage Solar System" somewhere, however I just have a few specific questions and I have not been able to find the answers in there or anywhere else for that matter.
Simply put, I a designing a small self-sustainable, off-grid power system in my back yard. I have mostly everything I need to complete my project and I have done the calculations to the best of my knowledge and ability, but I am not experienced or educated in the field of circuitry very well so I would like a second or more educated, final opinion.
What I have:
- 20 W Polycrystaline solar panel (w/ mount and proper positioning data)
- Charge Controller (small and cheap, but should get the job done with this size of system)
- One 10 W LED floodlight
- Programmable DC 12V Time Switch Relay 10A
- Simple 18AH 12V battery (Lead Based)
With adequate sun, I am calculating more than enough power generation to run one 10 W light for 4-5 hours a night so I am confident the system should hold up just fine. The main thing I really am not sure about is whether or not I need a junction box or not? I know the box helps serve a safety purpose, especially when you are joining together multiple panels, but I am not sure if I still need one for this system. I have toyed around with the system a little bit inside and have got everything to run correctly, but i am not sure if I am required to have a junction box outside for projects like this or if I am missing anything else vital in this system. Please let me know if you have any opinions on the system or whatI am doing in general; anything helps!
Thanks to everyone in advance