Someone here is recharging the battery (AA) with solar energy ?
I mean a little mobile kit .
I’m searching anything making me auto sustainable.
thank
Use an Xtar 4VC charger plugged into your cigarette lighter, and ask these guys what solar battery charging panel would be best to keep your car battery topped off when charging a lot of batteries, without driving.
Is that what you mean?
i di’nt said my english is bad. So i did not understand your story.
there are some backpacks with built-in solar panels
In my experience portable solar panels takes a looooong time to charge 18650s. A 20W rated panel could only fully deliver 15wh worth of energy into two 18650s (neither was full) after 5 hours of sun exposure, I was using a miller ML202 v4.
The thing is, the internal converter is not very efficient. Now take into account the loss from the charger. It could be that I’m on the southern emisphere, but none of the 20W “famous brand” panel with 4+ stars rating from Amazon could deliver more than 8W at 5V, under full sun placed perfectly perpendicular.
Being auto sustainable depends mainly on your daily consumption, if you only wish to charge a smartphone and provide decent lighting then a portable 20W mono crystalline panel would do. 18650s are a excellent and efficient way to store energy, AA ni-mh on the other hand, not so much.
I would recommend:
–20W mono-crystalline panel: about $50-100
-high efficiency powerbank with 2A input (plenty of choices)
-Usb Li-ion charger with high efficiency (miller series, Xtar MC1+, VC2.
As for AA Usb chargers I have no idea, I know goal zero makes one but in not sure about efficiency. When you’re producing limited amount of energy, efficiency is key. What’s your budget?
This exactly ten times over. While the 18650 is a better cell in terms of energy, you also need to consider what you are running off the cells and what state of charge they require to function well enough. If a high state of charge is needed, a AA format will fully charge far more quickly, and in the same amount of charging time many cells can be charged compared to one 18650. Also the smaller cell can charge fully during overcast days when the larger one won’t. My ‘worst case scenario’ gear runs on AA-sized cells because I can keep a higher state of usefulness even if runtimes are less, so they are more efficient for my purposes even if they are less efficient overall. Your needs will vary.
Unless you live in a sunny desert, small solar panel wattages should be viewed as comparative numbers only. With a year-round average for most of us, you should factor in ~50% more than the anticipated need which will compensate for bad days, electrical losses, and degradation of the panel through age.
Phil