everything you use from the batteries is pulling amps and you can add series panels till the cows come home and they are not going to replace the amps you are using, stop an think about the volts you are using to try to charge 12 volt batteries, you need to put back the amps back in you are using, your panels will take a long time to replace what you pull out of your batteries, contact some firm like Renogy and tell them what you are trying to accomplish, they will ask you to list all the things you power off your batteries and that includes the inverter and they can help you with your solar project, you are not getting the benefit of the output of the panels with the series hook up
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