Sunforce 50032 15 Watt Solar Battery Charger

I purchased 6 of these for a backup system for my home. Two Northern units and 4 Sunforce units all 15 watt. ( these are the exact same units btw, northern's are cheaper). With two inverters, a 2500 watt, and a 300 watt pure sinewave for computers and such. Hooked through a 7 amp charge controller to a pair of 110 amp hour deep cells in parallel for a total of 220 amp hr's.

I first hooked two panels up to see how they did, they worked well in very low light but couldn't ever get the batteries to "full" on the controller. I then hooked up a third panel and that gave enough to bring the batteries to full after a full day. With six panels hooked up, it will bring the batteries to "full" in a very few hours from a 30% drained condition.

These units are less then optimally placed and rarely get full sun, but do very well even without that. Two panels in full sun may very well have been able to bring the batteries to "full" but location is a problem for me. One other product of note is the P3 international "Kill A Watt" electrical useage meter. Doing a survey of electrical useage in my house to get ready for this project was an eye opener to say the least.

Great panels, at a good price, that do what you pay for...all you can ask for.

No problems with delivery (of two panels). Worked right out of the box, getting great wattage out of it. Only nit is I would have preferred a seperate power cable, vs. attached.

Mounting holes made it easy to build a PVC stand.

Haven't found another panel with these specs at this price.

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I put this on top of a metal storage container with 3 LED lights inside. I put in a controller and a 12 volt deep cyle battery, and I have lots of light.

Just for grins I put in a 400 watt inverter in case anyone wanted to run a battery charger for a DeWalt cordless drill. Great job site problem solver.

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Got mine undamaged from northerntool for $92.40 (with shipping and tax). A quick DVM reading (laid out flat on ground in full sun at 2PM June 19th 2007 in Minnesota): 21 volts and 0.8 amps = 16.8 watts. Now $92.40 for 16.8 watts works out to $5.50/watt, which is a very competitive price these days (note that they only warranty up to 80% of rated output). I plan to use this to drive a 12V fountain pump. According to the specsheet, "Yes, this panel is fully weatherproofed." Nevertheless, I wish it came with a plastic hail guard, as the glass feels delicate. Looks like the same product as the Sunforce 50032.

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It was simple to install on top of my RV. I was able to put a cover over the panel and keep getting the sunlight to charge the batteries. It charges even through glass on the inside of the RV.

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