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I'm doing a lot of wilderness expeditions an needs the lightest gear possible. I want to make a solar charger (for my nitecore nb10000) that is as light as possible and has a USB output 5V and between 2 & 3A.

I'm considering buying 2 of these USB solar panels 2 x 70grams:

https://www.aliexpress.com/item/33047177046.html?spm=a2g0o.productlist.0.0.41d05a05d70gAr&algo_pvid=87608020-b1de-4a4b-b0bd-554d96f6ba2b&algo_expid=87608020-b1de-4a4b-b0bd-554d96f6ba2b-14&btsid=0b0a556f16108034779727362e6c52&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

and 1 of these USB y cables 30grams:

https://www.ebay.co.uk/itm/USB-2-0-A-Female-to-2-Dual-USB-Male-Hub-Power-Adapter-Y-Splitter-Cable-Cord/284145962396?hash=item42286b4d9c:g:xUgAAOSwiJRf~ejA

and connect them to get an USB 5V 2.4A output at a total of 170grams.

Some say it works, some say it only works if the 2 panels has the exact same output, some say it wont work, some say you can burn the weakest panel, some say you wont get the double amp output, some say you need to install a 2 or 3A voltage controler regulator module like this one :

https://www.ebay.co.uk/itm/3PCS-5V-2A-Solar-Panel-Power-Bank-USB-Charge-Voltage-Controller-Regulator-Module/202064833235?hash=item2f0c00aad3:g:JDAAAOSw3GtZxMIe

Can anyone help me what to do? Its very important that it works and doesnt break and is as light as possible, because my life depends on my gear and I have to carry everything.

Or if you know an even better way, that works better and is lighter, then I will be very grateful if you will share :-)

Thanx

Thomas

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    \$\begingroup\$ Recommendations for products are off-topic here, and I have designed and built my own solution for what you want, but if I had to shop, I would go here, or to one of their competitors, and not shop at alibaba or ebay for mission-critical stuff. \$\endgroup\$ – ocrdu Jan 16 at 15:58
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    \$\begingroup\$ Based on their dimensions, they're only 6 or 7 watts of solar power in the brightest sunshine... Not likely IP68 if they have a USB connector. What else are they lying about? For reference, the Goal Zero Nomad 10 is 7 watts peak, 3 times the size (24x37 cm) and 8 times the price ($120) but it probably meets its specifications. \$\endgroup\$ – tomnexus Jan 16 at 15:59
  • \$\begingroup\$ Thanks, but the goal zero is too heavy. I have seen test of the cheap panels, that they are able to deliver about 5V 1A, so 5W. That makes the goal zero about 5 times heavier. Its way too heavy for my expeditions. Do you know if its possible to buy panels like the ones I linked to, but in good quality and without all tekstile its wraped in? \$\endgroup\$ – Thomas Lynnerup Jan 17 at 16:35
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You can parallel two Solar panels of the same voltage, although the battery pack accepts more power on the USB-C port at 18W=9Vx2A than the 10W=5Vx2A port.

So I would be looking for a 9V Solar panel in the 25W range which would have an open circuit voltage of 12V (Voc). Then you need a UBC-C cable and wiring diagram.

However I don't find anything in a quick survey, so I suggest you write to the OEM source of the Solar panels and battery pack.

I did find a wall charger though.

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  • \$\begingroup\$ Thanks, but if I go for 9V, I cant charge my phone directly if I need to, without an extra controler, unless its possible to get a controler with both a 9V and 5V USB output? The other advantage by having 2 separate USB panels, is that if one of them breaks, I still have one working :-) \$\endgroup\$ – Thomas Lynnerup Jan 17 at 16:43

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