Looking for Answers about NPower Charge Controller - 7 Amps of Array Current?

Yes, this charge controller will regulate the voltage from the panel. It is normal for A 12 volt solar panel to produce as much as 24 volts in direct sunlight. Be sure not to exceed 105 watts of solar input with this charge controller.

Absolutely yes. This device generates no sparks, and very little heat.

I've got the same set up. I got good results by connecting positive lead to positive terminal on one battery & connecting negative lead to the Negative lead on the second battery.

The NPower Charge Controller - 7 Amps of Array Current will handle up to 105 watts, and at less than $30, it is the best low-cost solution. It also has a blocking diode built-in, so you don't have to worry about your battery back-feeding the panel at night, which can happen if you connect the panel directly to the battery, and it will also help prevent over-charging.

Yes, this NPower unit will work. It's designed to work with a maximum solar output of 7 amps. A 15 watt solar panel produces between .4 to .8 amps per hour.

It can be used with up to 105 Watts of solar power. With only 20 watts total you want to connect these in parallel not series connections.

This unit is capable of charging multiple batteries, when the batteries are wired in parallel. Keep in mind that this type of setup will only work when the batteries are all in the same condition, so you must start will fully charged batteries. The more batteries that are added to the system the longer it will take to achieve full charge. If this item were used at full input (7 amps) it would provide a reasonable charge rate for up to three batteries.

This charge controller is not weatherproof and needs to be mounted in a dry well ventilated location.

Yes, it is possible to place this charge controller farther than 5 ft from the battery or battery bank that is being charged. Keep in mind that longer runs will require heavier wire.

The proper way to determine the correct components, is by starting with the electrical load that is being powered by the solar system and the length of time that that load will need to be powered. Volts x Amps= Watts. Once the Wattage of the load has been determined, an inverter that will supply more continuous wattage than the load consumes, should be selected. The size of the battery or battery bank (rated in Amp hours (Ah)) Will determine how long the battery bank can power the inverter on a charge. For example The battery that you have mentioned; item # 349903 (model # 45824) is rated @ 110 Ah. This battery would supply power to a 1300 Watt load (through the use of an inverter) for approximately 1 hour. The panel(s) that are needed for your solar setup will depend on the size of the battery bank, how many hours per day that you will require power, and the hours of direct sunlight that will be available to the panels. The panels that you have selected, will supply the battery with a 3.75 amp @12volt DC charge rate when exposed to direct sunlight. The capacity of the charge controller selected will need to exceed the amperage output of the panels. More information can be found on the topic at the following link http://www.northerntool.com/catalog/buyersguides/solar-power-equipment/