I bought this controller in January and started using it with 2 x 100Ah batteries and 2 x 30w solar panels. With 30 watt panels, the regulator seemed to charge a bit high and the SOC (State Of Charge) indicator never reached 100%, only 99%. Today is a very cloudy day and I decided to install my 210 watt solar panel. . This controller has to withstand 420 watts. The regulator worked with batteries up to 14.8 V! And still only 99% readable. If I didn't turn off the panel quickly (within an hour), this regulator would destroy my batteries and probably do some damage anyway. Anyway, you could hear them simmering. The regulator should never load above 14.2v and then keep the float at 13.8v by taking a chance on a cheap regulator. Turns out it's just cheap.
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