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1 vote

How to use a 49Voc solar panel for USB charging after a calamity (without using proper solar charge controllers)?

If you can find a way to load the solar panel down until its voltage is low enough for your buck converter, you can then connect the buck converter in parallel. Hope your multimeter battery is okay. ...
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Using an undersized Li-po/Li-ion charger for a large pack of 18650 cells

There is no minimum charging current for Li-ion batteries. You'll be fine. Just don't leave the charger connected for a prolonged time.
1 vote

How to use a 49Voc solar panel for USB charging after a calamity (without using proper solar charge controllers)?

In Star Trek, one of the alien races jokes "where are your Starfleet engineers who can turn rocks into replicators?" Yeah, you can't turn rocks into replicators. "Pulling a MacGyver&...
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How to use a 49Voc solar panel for USB charging after a calamity (without using proper solar charge controllers)?

One extremely inefficient way to do this would be to build a high-power voltage divider with the resistors in parallel. Drop the voltage down to 1/3 of its original value, then run that to the USB ...
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