Looking for Answers about NPower 15 Watt Amorphous Solar Panel?

you must connect the panels in parallel. connect all the red wires together an all the black wires together.

You may have made a decision by now, but to correctly answer your question, you need to provide a little more info. It is important to know what size/type of batteries you plan to charge, as well as what's your intended use for the batteries. If you are simply using the panels to charge the batteries, then disconnect them and use them, say in a boat, then you'll need to consider how many hours of use between charges and the size of the batteries (CCAs). It's easiest to consider power leaving versus power being replaced, so if you're charging batteries that are used daily, your demands will be drastically different than an application that will occur only three hours per week. As answered previously, the direct answer to your question is "yes", these panels will charge two deep cycle batteries connected in parallel. The efficiency of which they will charge-i.e.,the amount of time required to charge them completely after each use-depends on the information mentioned above. Sorry for the non-answer. Calculation is pretty simple. Power used must equal power generated. At 15 watts per panel per hour, with a max of 7 hours charge time per day per panel, it's easy to see that it would take multiple panels to charge the deep cycle batteries in this arrangement. Remember, you must use a charge controller, and the charge controller is limited to 7 amps (7 panels).

Always use a charge controler. Youre batteries will last MUCH longer. Worth the investment.

i belive it will. you are only using 2 small devices that will not drain the battery much.

This system has worked well in keeping our 12 volt battery charged which odes operat our ceptic system. We have found it to be very reliable in keeping batteries charged. This could be hooked up to your lighting system if the battery is capable of providing enough power to operate the system.

If the fan is 12 watts, draws less than 1 amp and plugs into the cigarette lighter, you won't need anything else to run it during the day.
If running it after the sun goes down, you'll need a battery.

It's a sealed unit, and is waterproof.

I know they will take up to quarter-size hail.

Yes I have had them mounted on my truck parked outside for years

YES, you can run longer lengths but you just need to increase the wire size to reduce the resistance along the run. I have 10 panels connected together and have all of them spliced onto a 12 foot section of 8 guage THHN wire to the controller. It's total overkill but I like to make sure every drop of power makes it! In your situation, if you only have one or a few panels, you can use anywhere from 16 guage to 12 guage wire.