firstly: what are you going to run off it?
secondly remember that panel outputs are rated at full sunlight so if its cloudy you arent going to get as much charge
and most importantly get a decent battery pack from a name brand supplier. i have sen 18650 batteries rated at 10,000mAh which is bullshit as even the best ones are 3500 tops. i have even dismantled "power banks" with 4 battery cells in them and found 2 of them were fake and were filled with sand to increase the weight
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