DIY Solar USB Charger – 6V, 12V, 18V Different voltage test

DIY Solar USB Charger - 6V, 12V, 18V Different voltage test

Many people made their own DIY Solar Charger but never actually measured and tested the performance. Current as low as 0.10A could also trigger the phone charging signal (however it might take days to fully charge it. Bad examples will lead you to lose passion and interest on Solar Projects…..
Besides wattage, the voltage value plays an important role in DIY Solar Charger. Enjoy the video and happy DIY !!

Solar Panel Specs :
18W – 18V Panel – 21.6Voc, 1.12Isc (18Vmp, 1Imp)
18W -12V Panel – 14.5Voc, 1.43Isc (13.2Vmp,1.3Imp)
18W – 6V Panel – 7.65Voc, 2.9Isc (6.6Vmp, 2.7Imp)

19 Comments on “DIY Solar USB Charger – 6V, 12V, 18V Different voltage test”

  1. So if I were looking to get a FOLDING Solar panel, It won't make a difference
    whether I get a 7 watt, 15 watt, 21 watt Anker, OR 28 watt FOLDING solar panel?

  2. You should understand some basic equations (wattage=volt×amperage) You are using pulse with modulation(PWM)….. When you use 18v solar panel to charge you are cutting off the extra 13v(18v-13v) from the solar panel and pumping the rest 5v and 1 amp of current into the battery so just 5w of current is getting from Your 18v solar panel, when you use 6v panel you are cutting off just 1v and pumping the rest into the battery(5v and 3a) so you get 15W. It is better to go for MPPT so all the energy produced by your panel will be pumped into your battery no wastage of energy…. It is always suggested to go for higher voltage (if you are using MPPT) because higher voltage means lower amperage so less wastage of energy by joules heating and less thick wires can be used

  3. Good point! Very substantial findings you got there! Thank you!

    Solar type powerbanks may indeed make sense right?

  4. Use the higher voltage panel with a proper MPPT controller. Save on I2C losses…and stop feeding voltage straight in you dork! Power gets wasted if the input converter isn't efficient…No this is not a great video, it is a horrid video as it shows a great lack of knowledge in proper power conversion and efficiency.

  5. When using a "buck" converter (buck lowers voltage which is what the video author is using), lowering the solar panel voltage to a different very specific voltage causes some loss in the conversion. The results are because he is going down to 5V DC (USB) from 6V DC which is the lowest "change" in voltage leaving more current left over from the conversion. If you need a higher voltage like 12V for car/boat then 12V DC panel would "in theory" be most efficient "as long as you have ABSOLUTELY perfect lighting conditions"! However the 18v would for most be preferable because in less than perfect lighting (clouds/imperfect angle) the 18V will still drop output voltage due to imperfect light but most of the time the panel will remain above 12v DC and not require using a "boost" (raises voltage) converter which is slightly less efficient than a basic "buck" converter. Hope that helps explain what is happening here.

  6. So the higher wattage of cells doesn't determine how fast it wil charge ur phone right? Is it save if I use that 6V panel with car travel charger directly to my mobile phone?
    Sorry for my bad english

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