Hy. I have a 100W solar panel rated at 5A, i did a simple charger using a simple LM388 ( 5A linear regulator for testing, i know a mppt would be better but the cost of it dosent realy make sense for me for that price i buy one more 100W panel and with loses and everything still i will get more that the mppt can get out from the singel 100w panel).
Everything was fine so i got a 12V lead-acid battery , put it to charge, it was drawing 4.2amps yesterday tuday it draws only 0.8A so it prity much charged so i linked the inverter to the battery ( to drive a 50w water pump) the inverter needs about 3.8amp to drive the pump so i was hoping that the inverter will pull 3.6 +/- amps from the solar panel and if it requires more he can get it from the battery but it dose the reverse. When i start the inverter the panel give 1.2amps instead of 0.8 but thats all so the inverter pulls the 3.6amps from the battery wasting the power of the panel....
Is this normal because i used a linear regulator ? would a buck-converter (PWM step-down) solve this problem ?
THX for any help.
Everything was fine so i got a 12V lead-acid battery , put it to charge, it was drawing 4.2amps yesterday tuday it draws only 0.8A so it prity much charged so i linked the inverter to the battery ( to drive a 50w water pump) the inverter needs about 3.8amp to drive the pump so i was hoping that the inverter will pull 3.6 +/- amps from the solar panel and if it requires more he can get it from the battery but it dose the reverse. When i start the inverter the panel give 1.2amps instead of 0.8 but thats all so the inverter pulls the 3.6amps from the battery wasting the power of the panel....
Is this normal because i used a linear regulator ? would a buck-converter (PWM step-down) solve this problem ?
THX for any help.
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