Solar Panel Wiring Question

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AmeDeBoheme

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Hiya gang -

So - I am about to install two DM158 monocrystalline solar panels panels on my roof through a 30amp PWM controller to a bank of three brand new group 29 deep cycle bats in parallel with 4 gauge cables using a 10 gauge specailty PV wire(tho I am strongly considering splurging on a thicker gauge wire for this).

Question(s) is(are) - I have read that some folks install in line fuses, some install junction boxes some install disconnect switches etc. some diagrams/instructions/walkthrus don't mention these at all and just run cable from the panels to the controller and to the bats. Opinions on what I should do? Are all of these or some of them important? If so - what gauge wire should I use on say the in-line fuse? I have only ever seen them for sale in the 16 gauge wire range for rv/auto/marine accessories. Also - a more general systems question... Installing this solar charging directly to the battery, say I am plugged into shore power or the genny is rumbling...are the batteries not being bombarded with charge from every angle? Is this ok?

Forgive if some of these ques are basic or I am misunderstanding something - still a newb learning as I go (mostly from you wonerful folks)
 
Here is a good website to learn about solar wiring.  http://www.jackdanmayer.com/rv_electrical_and_solar.htm

Paul
 
It is a good idea to use a junction box and in line fuses for the solar panels. I use 2 awg cable from the junction box to the controller and 2/0 awg from controller to batteries and 2/0 awg cross over cables at the batteries. I also have a switch before and after the controller. Fuse holders with 10 awg pigtails are readily available at auto parts houses.

Here is one from Amazon
http://www.amazon.com/In-line-ACT-Water-resistant-Fuse-Holder/dp/B0002KR88A

They are also available at better prices on eBay

I use the Blue Sea small battery switches before and after the controller
http://www.bluesea.com/products/category/Manual_Battery_Switches/m-Series

The fuses and switches make it convenient to disconnect things during installation and maintenance.
 

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