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Back in the day...before we had access to today's technology there were a number of implementations for making use of TV tuners.
TV tuner spectrum analyzer.
The above is good advice, use a purpose designed solar charge controller.
Different batteries will have a specific charge profile that will give the maximum battery life (discharge/charge cycles). You could use a solar charge controller with a generic charging profile or you can match...
800 amp is not the amp hour rating of your battery.
It is the CCA (as listed in your post), cold cranking amps (max available at 0 degrees F).
CR is the time in minutes for the battery to discharge to 10.5 volts at a specific rate, 20 amps or so.
It likely if your batteries are in good...
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