20 watt Solar Panels under $30, Which one is best?


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SOLARLAND 20w https://ebay.to/2Uti85V Schottky Diode http://s.click.aliexpress.com/e/cf4kBbDI 20w MonoFlex w/USB http://s.click.aliexpress.com/e/e9vWG6Sy Suaoki 18v/20-25w panel https://amzn.to/2FW38dC 8amp charger https://amzn.to/2MGa92Q HIT SHOW MORE

MIGHT MAX 100 watt ( excellent 4 buss bar panel ) are now under $99, currently $80! https://ebay.to/2EGsN8i

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Links Sourced FROM

NewPowa Inc SolarLand Distributions High efficiency 20W 12V Polycrystalline Solar Module Panel https://ebay.to/2Uti85V

12V 20W Kinco Solar Panel USB Monocrystalline Solar Panel with Car Charger for Outdoor Camping Emergency Light Waterproof http://s.click.aliexpress.com/e/cqFTkkyo

ALiExpress International rectifier Diode Schottky B10100 http://s.click.aliexpress.com/e/cf4kBbDI

Suaoki 18V 12V 18W Solar Car Battery Charger Portable SunPower Solar Panel Trickle Charger with Cigarette Lighter Plug, Battery Charging Clip Line for Motorcycle RV Boat Marine Snowmobile https://amzn.to/2FW38dC

ZEALLIFE Solar Panels Charge Controller, 8A Battery Regulator for 12V Solar Battery Charger, Solar Battery Maintainer and 12 Volt Batteries Power Kit Safe Protection (LCD Style) https://amzn.to/2MGa92Q

SOLAR LAND 20 watt Sourced full direct –
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Mono vs Poly vs Flexible Solar Panel + Series vs Parallel Wiring
Amorphous CIGS and New tech Solar
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25 replies
  1. Mike OMAX
    Mike OMAX says:

    After watching this video I got the same controller. Have connected to 50W solar panel and
    motorcycle Pb/acid battery, Display show charging 12.4V, 0.00A. It is rainy day but why 0.00A ?

    Reply
  2. Ron Hoffmann
    Ron Hoffmann says:

    Great intro video for me. Got the pieces put together with a 20AH apm battery for a little demo solar generation system that should be enough to a laptop, charge a phone. Got a 12V light bulb and modified a small ikea lamp to wire directly to the load side of the charge controller. All working!

    Reply
  3. Tkltz
    Tkltz says:

    I've heard, that there are different types of solar Panels – some are good in full sun, but no good in shade. The flexible – thin ones might be not as good in full sun, but give out some power even in cloudy days. It would have been interesting to have your test under both conditions to see the difference there as well.
    But thanks – good comparison.

    Reply
  4. Team Skovhugger
    Team Skovhugger says:

    Maby its a stupid question, but why are you testing 20 watt panels ? If its for offgrid use is it not normal that solar panels are 100 watt or more ? Just asking im still new in all this , so if i dont ask i wont learn anything from you guys that knows about it and have many years of knowledge, sorry about my old rusty school english 😊 like your videos 👍

    Reply
  5. Chris W
    Chris W says:

    "Test 3 popular 20 watt Solar Panels" And 60% of the way in we've explored the surface reflectivity (!?), how to safely open a box, and how to put a diode on the cheaper ones. I'd give you the last one, but still Definitely in the Top Ten of YouTube Don'ts. Stick to your title if you want more Subscribers and Thumb-Ups. Keep side-tracks short and sweet. "This one came with cables, this one didn't even include diodes, I'll show you how to add them later" "Be careful opening the boxes – the cheaper ones usually aren't packed well." Bam.

    Reply
  6. Robert M
    Robert M says:

    Which solar panel would be good to use for smart phones? I bought a few pocket solar gear products they charge really slow and only gives one bar after 6 hours charge. I used Bruton solar products doesn't work that great for changing.

    Reply
  7. Tony tFuntek
    Tony tFuntek says:

    Great video but I have 2 questions. If you're going through a controller why would you need a diode ? Also, don't you lose voltage( I'm guessing around .3 volts) when you add a diode? Thank you…this was very informative.

    Reply
  8. notyoung
    notyoung says:

    Unless you're connecting the panel directly to a battery or using an extremely cheap charge controller without isolation, you do NOT need a series diode. If you check carefully, you'll find that current production solar panels have a BYPASS diode across the panel output, which only comes into play when you have series connected panels and they are subject to partial shade. When the output of a shaded panel drops sufficiently, the diode will be forward biased by the voltage from the other panels and the shaded panel will be bypassed – that's the reason these diodes need to be rated for the maximum panel (or array) current.

    I have two of these panels on order and while they will get diodes, they will be BYPASS diodes for the (unlikely) possibility I'll have them in series for connection to an MPPT charge controller which can actually do something with the excess voltage – excess when 18 volt panels are in series and charging a 12 volt battery bank. I'll be using 15SQ45 15 amp, 45 volt Schottky diodes for their low forward voltage drop and these specific diodes because they are spares for repair of the 250 and 300 watt panels used in my larger solar system.

    Reply
  9. Range Man
    Range Man says:

    Solar is worthless unless you cover your roof with them.!.. I have 1000 watts of panels and a wind turbine… I don't even use them !   the problem is,  the AMP/HOUR rating of the batteries is meaningless!  unless your running 12V off of them…. if you invert  to 120V, the inverter shuts off just under 11 Volts to protect itself, and you can never get more than 1/2 of the power out of the batteries…The only real choice is to run a grid tie inverter and sellthe power back to the electric company.

    Reply
  10. RUST
    RUST says:

    Re-test them using a 20w-30w light bulb not a solar charger and use a multimeter to check the amps.. chargers will always start low and not bursting full on amps. They all do this to extend the battery life.

    Reply

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