How long will it take 12v 80w Solar panel to fully charge a 100A battery?
I assume you mean a 100 Amp-hour, 12V lead-acid type battery?
With 12V you can never fully charge a 12V battery. You need a minimum of 13.5V to fully charge the cells. 14.5V would be better. If the battery is low, you can use 12V to bring up the level of charge in the cells, but never to full capacity.
For an 80W solar panel with 12V loaded terminal voltage -- that is 6.66 Amps. 15 hours will get a "dead" battery as fully charged as it can be, under the circumstances.
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80w solar panel PV Monocrystalline 12V 80 Watts - SolarPanelsWork.co.uk
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