Things to Consider Before Purchasing Used Solar Panels

Solar panels can cost you a fortune if you want to purchase a new one. However, it is possible that you can grab one from a thrift shop as long as you are able to distinguish if it is still functional. You have to remember that there are still no recorded data on how long solar panels can last.

If you are interested in buying used panels, you have to consider a lot of things. Newer solar panels can pack more wattage into a more compact space than older versions of solar panels. But if you do not consider the space, you can buy used solar panels probably in terms of dollars per watt. You should not purchase old panels with obvious damages unless you are capable and willing to fix them. The common problems of old panels are condensation under its glass, cracked glasses and broken connections. These can sometimes be fixed but you should take a risk in buying them if you are not sure that you can fix them. You should also take into consideration the fact that sometimes the power output of old panels decrease slightly.

Another problem is loose connections among the actual solar cells. This can be fixed by soldering which contains at least 2 percent silver or with the use of conductive epoxy. The last and most important thing you have to do before purchasing an old solar panel is to test them. In testing the power output of your solar panel, you should set your voltmeter to DC volts then measure across the positive (+) and the negative (-) terminals of the panel. This is referred as the open-circuit voltage. If the panel is designed in 4 panels in a series or in sets of 4, it should show at least 4 to 5 volts. If you are dealing with a 12-volt panel, it should show about 21 volts when under the full sun. If the meter you are using can measure DC amperes, set it on a high enough range so your meter will not go up in smoke then connect it between the positive (+) and negative (-) terminals under the sun. This is now called the short circuit current. For the 12-volt panel, multiply the current by 17 volts which is the rated voltage of most 12-volt panels to get the value in watts. Once you are able to properly check the panels, you are ready and sure enough in buying them.

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