welcome. The panels you mention, produce their max power, at about 29V. You could use them to charge a 12V battery with any common PWM controller, but you would waste about 50% of the panel power. (8 amps x 14V = 112 watts). To get the max power out of them, you need any reliable MPPT controller, which has the built in DC - DC convertor.
I don't open attachments, so I cannot comment on your controller choice, a link to the Steca site would have been helpfull.
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Compatibility of a 24V panel with a 12V battery
I have brought a 245 watt solar panel solar panel the specifications of which can be obtained from http://www.dmegcsolar.com/download/P156-60.pdf The panel no is DM245-P156-60. Now I need a MPPT controller which can charge a 150 Ah Tubular battery. I stay in India. This is a 24 v panel. Can it be used to charge a 12V battery? I am choosing Steca PR 1515, which is attached as an attachment. Another choice is Steca Solarix MPPT 1010. I have attached both the specifications. The company representative is telling me that these cannot be used to charge a 12V battery. You have to upgrade battery to 24 Volt. Is this true ? I am thinking of using a DC to DC voltage convertor that can bring the panel voltage to be compatible with 12 V. Is this OK ? Out of the two options which one shall be O.K. ? I have also attached circuit diagram of a PWM controller. What modifications have to be made to support my panel and my battery ?
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