I'm new to solar energy, but I'm very interested in it. I would like to seek advice from a

I think you want to use solar charging with lights. This is not suitable. The solar panel voltage is not sufficient. The charging voltage of the 20 A battery should be at least 13.8 V. at least 15 V. Then it will be morning, evening, it will rain. If the power drops due to daily adjustment, etc., the voltage should be increased to about 18V, preferably 20V, and the LM317 should be used as a dynamic voltage regulator for charging. battery. The new fully charged 12V20A battery can last about 8 hours with a 30W bulb. The circuit is very simple. The negative pole of solar energy goes directly into the negative pole of the battery, and the positive pole goes through a stable source composed of 317 to the battery. It is better to add a diode to avoid reverse discharge. and prevents reverse polarity protection.