Ramsond 50 Watt Solar Panel 50w W Monocrystalline Photovoltaic PV Solar Panel Module 12V Battery Charging Charger RV 25 YEAR

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Price: $299.99 $144.99   

Product Feature

• 50 Watt Monocrystalline Photovoltaic (PV) Solar Panel - Nominal Output Voltage 12V - Grade A Solar Cells - 17% efficiency
• Maximum/Peak Voltage (Vmp): 17.1 V
• Open Circuit Voltage (Voc): 21.6 V
• Maximum/Peak Current (Imp): 2.92 A
• Short Circuit Current (Isc): 3.26 A

Product Description

Ramsond solar panels use the most premium components and raw material. Ramsond solar panels use only 'Grade A' quality, high purity silicone cells. Ramsond does not incorporate used, rejected, refused or second-hand cells into its solar panels. Furthermore, Ramsond utilizes the most advanced technologies in the production of its panels, such as a fully automated, microprocessor guided, precision, robotic arms guided soldering process of the solar cells. The solar cells are coated with a blue nitride anti-reflection coating. This special coating process provides a uniform blue hue color and increases light absorption in all weather conditions. The encapsulation and lamination process used with Ramsond solar cells consists of a process that ensures true atmospheric vacuum and encapsulation of cells within lamination layers of High Ethylene Vinyl Acetate (High-EVA) and DuPontTM Tedlar®. Each panel is equipped with low-iron, patterned, tempered glass. The glass has been manufactured, again, through a proprietary process, providing up to 60% more strength, as compared to conventional photovoltaic (PV) glass. As a result, Ramsond panels are among the world's strongest, with hail impact survival index rating of 25mm@80 km/h. This means the specialized PV glass of Ramsond panels can withstand hail size of 1+ inch, traveling at speeds of approximately 50 miles per hour.

Ramsond 50 Watt Solar Panel 50w W Monocrystalline Photovoltaic PV Solar Panel Module 12V Battery Charging Charger RV 25 YEAR Review

I don't have a lot of experience with solar panels (yet) but I know enough about volts, amps and wires to run this one through some quick tests. Part of the problem I'm having right now is that I'm in Wisconsin and it's wintertime. I attempted one test with an Ohmite power resistor load and a Fluke meter and sunlight filtering through my windows in the afternoon. That try was a complete bust. Lesson #1: If the entire panel isn't illuminated, forget about getting any usable current.

Before trying the panel again, I obtained a WattsUp meter plus a 10-ohm 50-watt rheostat and made everything connectible with Anderson Powerpoles for quick, reliable connection and disconnection. The WattsUp meter is very handy because there are a couple different ways to put it in-circuit between the panel and rheostat to get continuously-updating DC power measurements on just the one meter.

When I finally had a clear day without utterly freezing weather I laid everything out on the driveway and hooked it up. The rheostat was dialed up to about eight ohms. It was 2:30 in the afternoon in early February so again, the sun was low. With the panel lying flat on the driveway the output was, as you would expect, abysmal (due to lousy angle of incidence). Even the voltage was low (eight volts). Once I tilted the panel up a bit though (and with nothing filtering or blocking light) I got usable current. Directly facing the sun, I was able to get 2.15 amperes at 17.0 volts (37 Watts) without messing with the rheostat. Unfortunately, I didn't have a lot of time or an extra pair of hands to trim the rheostat and find the maximum power point, which I suspect was an ohm or two lower.

I should also mention that the shipping/packing on this item was better than expected and the aluminum frame is pretty typical. To summarize: Physically, it's a good unit. Electrically, I was a little surprised at how I had to dote on it (assuring 100% illumination on the panel and tilting/turning it) to get a couple amperes. Maybe my expectations were a little high in that regard. I'm learning...

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