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

I ordered this 50 watt solar panel to charge my RV batteries while the RV sat in storage and to use when we dry camp (camping with out power or hook ups). At present i have only had the opurtunity to use this unit to maintiane the two six volt batteries charge and it is doing a great job. I originally ordered this with the HQRP solar charger (the charger was damaged on shipment and was returned) I have sinced purchased another charger ( a sunforce 10 amp ) and had a chance to bench test the system with a automotive style battery. The instructions say that you should start the system with a charged battery (these charge controlers do not have the capacity to charge up a dead battery, too many amps to draw, and they are designed to shut down to protect themselves under heavy loads) which I did. I attached a a/c-d/c converter, a volt meter and a in-line amp meter to the battery to observe the performance and operation of these devices. I was very impressed with the performance. I put a 4 amp load onto the converter/battery and on a clear sunny day this solar panel maintained the battery charge and ran the 4 amp load for about two hours till the sun light was blocked by light clouds, only until then I saw the battery start to discharge. I allowed the battery to discharge till the voltage fell into the low 11 volts. I disconected the 4 amp load and allowed the solar cell to charge the battery only and in about an hour the battery was charged and above 12.8 volts. Very good performance for northern california.I will re-post when I do dry camp. I will be able to give a better idea of how this system performs under a real working load condition over time.Update, Nov, 2013. I have had this panel on my RV and it has kept all the batteries charged and in good order. It has been in the weather, good and bad, hot and cold and has held up very well. I have also installed an isolated parallel circuit for this system to charge the RV's 12 volt engine battery. I have seen it written that you should not mix 6 volts and 12 volt batteries (I have two 6 volt batteries set up in series to produce 12 volt) and charge both on the same circuit. As I said I have installed isolation diodes/relays and paralleled the charging circuits and made sure that the controller was sized correctly and it appears to be charging all the batteries fine. BTW, the isolation relays are to disconnect the solar charging circuit from the engine battery when the ignition is turned on. This is to keep the engines alternator charging circuit from back feeding voltage into the solar circuit (even though diodes will do this job alone, I like my redundancy).Update, July 2016, I have had these same products on my RV since I purchased it. I also have the same batteries from the same install date. That means that this system has not allowed the batteries to either over charge and cook the cells in the batteries nor under charge and allow the batteries to fail. I have also dry camped, several times, for over a week and had to run my two 12 volt heaters all night and even though I did see a large voltage drop on the coach batteries by the morning. During the day, the single solar cell charged both batteries up fully for several repeated nights running of my heaters (during the day I run a small gas indoor heater to keep warm but to be safe, I don't like to sleep with the idea that a heater is burning my oxygen and producing carbon monoxide). The controller does "condition" the batteries as described which dis-allows sulfates from developing but I did notice that this controller does cause the water level in the battery to drop over a few weeks so I do need to make sure I visit the batteries, in the off season while the RV sits, and keep an eye on the battery water level. So far I have been very impressed with my little set up and I have not seen an issue with mixing 6 volt and 12 volt batteries on the same charging system (see mention above in last update). I am currently ordering three more of these solar cells and will be installing a bank of four 6 volt batteries and a 12 volt to 120 volt converter so I don't have to run my noisy/smelly generator to power my tv and lights at night (and save my gas for traveling).

I could only get about 30 watts out of these in the middle of summer in the central valley of california where it was 107 degrees outside and clear and sunny although there was some smoke in the air it appeared clear.

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...

I bought this for an experimental PV system to evaluate panels, batteries, and inverters prior to going to my full 1000W system. The panel is well made, easy to wire up, and worked right out of the well packed box. Right now I have a 35AH battery (from Amazon) a 400W Cobra inverter (from Amazon) and I'm running a 13W CFL dawn to dusk with the inverter on 24/7. I will be able to evaluate how much actual energy the panel puts into the battery each day and thus be able to come up with my scale factor for what size batteries and inverter(s) to get when I upscale to a 1000 Watts. All in all, I'm really happy with the quality of this panel. I intend to buy the Ramsond 100W panels through Amazon when I build the bigger set up.

Awesome!!!!!! That's the only word for these! I ordered them yesterday and received them about two weeks earlier. I mean these People knew what I needed before I did. Seriously though, this is one of the best values From a world class partner on Amazon. I can not imagine who or why they would ever get a negative rating. They have earned 4.8 out of 5 star with thousands of reviews. But the Product is as first class. I hooked these upto a preverter connected to two "DD" cells and a 24 volt charge controller and ran my entire house for 6 weeks! The solar panels kept those "DD" cells really perked up.I ordered three more sets six months ago and can't wait for them to arrive, I selected the prime "20 mule team" delivery and they arrived today. They have already out lived their 25 year warranty and I can see them absorbing solar radiashun right thru the brown paper bag!The internetsky is a winderful ting.......