A 48V battery bank will want to charge at anywhere between 50-59 volts, and for lead-acid that needs equalization, up to 64V. So, you need a panel string that is ~ 58V X 1.
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Your solar system may not charge your battery due to low power generation or a technical fault. Check for faults in the solar panels, inverters, or wiring. Ensure all components work correctly.
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The phenomenon of spontaneous combustion within solar panels can be attributed to various factors. Overheating due to faulty components, 2.
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You need around 430 watts of solar panels to charge a 12V 140Ah lithium battery from 100% depth of discharge in 5 peak sun hours with an MPPT charge controller.
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