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Those are most certainly not Anderson connectors. They are SAE connectors and they likely have 12AWG or 14AWG wire attached to them. This makes them suitable for around 15 amps, at most. The first thing I would do is cut off those crappy SAE cable ends, verify what gauge wire is in there, and then attach genuine Anderson Power Pole connectors. This will make it easier to connect to better quality solar panels and, presuming the wire is up to the task, make it safer to actually push 20 amps. When you look at their max VOC and max wattage for each voltage (12v and 24v) you can see they actually limiting the input to 10 amps.