I have a couple of 5000 mAh power banks and a few lights with 2000mAh capabilities. I also have three Goal Zero mini lanterns, thee old style with replaceable batteries. Their total capacity is around 18000 mAh.
I have a couple of 5000 capacity power banks which have lost their ability to charge, or their ability to register their charge rate.
Okay, so you want to charge about 34000mAh worth of batteries.
34000mAh = 34 Amps
Watts = Amps x Volts
34 Amps x 12 Volts = 408 Watts but you need to add at least 10% extra to make up for inefficiencies so lets say 450 Watts.
A 30 Watt solar panel exposed to 8 hours of sunlight:
30W x 8h = 240Watts
So it'd take almost 16 hours of sunlight for one 30Watt solar panel to charge everything you have all at the same time.
Increase to a 50Watt solar panel:
50W x 8h = 400Watts which is almost enough power in 8 hours to charge everything
If using a 100Watt panel:
100W x 8h = 800Watts so it's charged in around five hours.
My recommendation:
50 Watt solar panel:
https://amzn.to/30qaoH4Blocking diode to prevent electricity flowing back into panel:
https://amzn.to/3bx6i6lPWM charger controller to protect batteries from overcharging:
https://amzn.to/3qywuBy12VDC & USB outlet connected to charge controller:
https://amzn.to/2OfJKhqPersonally, I'd add a single, 35Ah deep-cycle battery to the system, connect it to the 12VDC/USB outlets, and then charge the smaller stuff off it.
-Blast
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