20 Watt Solar Panels If you’re just starting out in solar or you are adding on, a lot of people look for 10 or 20 watt solar panels. If you’re just starting you usually look for what I call the cheap stuff to get your feet wet and find out how to utilize solar power. It’s usually something you don’t depend on.
In some cases you’re adding on to panels you already have for the RV, boat, cabin, etc. You already know what panel you want. You’re happy with a particular brand or seller. Other times if your like me, you’re looking for the most bang for you buck. You can make just about any brand of panel work if it has good mounting components similar to the ones you already have.
If you find a deal where you can get more wattage per dollar then it’s worth it to mix and match. If you’re going that route Below are some 20 watt panels. Otherwise there are some nice packages also.
If for any reason you do not see a 20 Watt Solar Panels in the page below or in the right column, make sure to utilize search box off to the right.
After you get some mileage under your belt and you know what you want and what components go with what you usually step up in panel power. Usually in the neighborhood of under a 1000 watts and it’s still going to be on a limited scale for example. Not something you would power a home or large cabin off of.
Next up would be something like a roof or rack system. It’s going to be some type of off grid system. You’re going to need batteries, charge controller, inverter, panels as the basics. By the time you’re at this point you’ll know or know who to ask. You will also have dealt with solar dealers and if one delivers like they say and you’re happy. You usually go back to the same person. About the only reason you wouldn’t is because of price. Most dealers will price match if you give them a chance. It’s always worth an email or call to ask.
Almost all that I deal with is off grid, anything past that, like tie in to the AC will take an electrician and is not what this site is about at all. Usually the smaller the panel the more you’re paying a watt. Just like any other item you buy on the net, the more you buy the cheaper it gets. The going number these days is 2-4 dollars a watt.
Most of your smaller panles are 12v. There are smaller ones in voltage but I don’t deal with them. I have years ago but it was more electronic projects but you can’t really compare those to the solar cells of today.
As you move in to the medium size panels those are usually in the 100 watt size.
Nice video on the using your panel under load and the readings he gets in the real world.
so here I’ve got a 20 watt solar panel and this is a poly crystalline tight conceal the higgledy-piggledy crystal structure there on the surface it’s a 36 sell panel and actually probably more importantly this is an absolutely glorious cloudless day and have sunshine all day perfect for conducting solar power experiments and to go with my 20 watt solar panel I have this which is a 21 what bulb 12 volt 21 what out of a car of what a little wire harness on it so i can connect it up this is a car brake light bulb so on the face of it he should be a perfect match the 21 what bulb and a 20 watt solar panel so let’s see if we can lock up light up the bulb so I for angled the solar panel directly towards the Sun and connecting up the bulb and it is and it’s on it lights up so it works but it’s not terribly bright is it in fact it’s really quite dim so that does appear to be a problem connecting a 21 walk bulb to a 20 watt solar panel so I’ve worked up a couple of from digital voltmeters digital multimeters and connected into this little block here which enables me to measure current and also volts so let’s have a look at what we’ve got without the bulb connected on the Left we’ve got volts so the open circuit voltage of this panel is 20.5 volts and of course is no current flowing at the moment because we have no circuit because the plug isn’t connected to anything so let’s connect up the bulb and see what we get that’s the kinect that’s the one for the bulb right so once again just a dim glow on the bulb so on the right which is the ampere meter is the current meter we’ve got 1.17 amps and on the left we’ve only got 5 point 6 volts so that immediately explains why this bulbs isn’t very bright 5 point 6 volts on a 12-volt bulb sony running a half voltage so why is it that this 20 watt solar panel doesn’t just miraculously detect that it’s a 12-volt bulb and shove 12 volts through it well solar panels are pretty done and it just isn’t going to do that in fact so the past very fussy about the load that you connect in order to get the full power wattage out of the panel now there’s a little clue here on the back of the panel it says smart solar poly crystalline photovoltaic lodgin working voltage 18 volts now we had nothing like 18 volts we had five and a half faults working current 10 50 million so that’s one point oh five amps and we had about we have more than that actually we had about 1.1 something so certainly the voltage is way out and we need to have a good look at why well the sun’s come around a little bit now and we’re getting a bit more power through the bulb we’ve got a 5.9 three bolts on the voltmeter 1.21 amps on the a meter so let’s calculate what we’re getting in terms of watts power into that bulb 5.93 1.21 let’s go to the calculator I . three times one so we’re only getting 7.2 what’s this is a 20 watt solar panel so you only get 7.2 wats is a bit disappointing and what’s going on here is that there is a mismatch between the bowl as a load and the solar panel and the sort of load that it requires we’re going to need to do some mats to work out what’s causing that mismatch so we’ll cover that in part two
20 Watt Solar Panels that have been located here
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Filed under: Solar Panel Wattage
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