Yes, you can charge a lead-acid battery with a solar panel. Use a solar panel with at least 120 watts. Lead-acid batteries need adequate sunlight. They also require proper charge controllers to ensure good charging efficiency. [pdf]
[FAQS about Can a 6v photovoltaic panel charge a 6v lead-acid battery ]
This variable output boost power supply / DC-DC converter module accepts an input voltage from 5V to 32V and boosts it to any level from 6V to 48V (output voltage must be greater than input voltage). [pdf]
[FAQS about 6v boost to 48v inverter]
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