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Thunderbolt 30 amp solar charge controller

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Thunderbolt 30 amp solar charge controller

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Thank you for selecting the SMK MPPT solar charge controller. The SMK MPPT series controller is an advanced maximum power point tracking solar battery charger. The controller features a smart tracking algorithm that finds and maintains operation at the solar array peak power point, maximizing energy harvest. Just bought the HF 45W kit. I agree, the controller is kinda cheesy. Would a 20 Amp, 12 Volt charge controller be sufficient? Reason I am asking is the HF optional accessories card shows a 30 amp, and I already have a 20A controller. Also, if you charge two 12vdc batteries (in paralell) does it take twice as much time as just charging one?