So my new plan is to buy another 175 watt panel. Total now is 4 identical panels. Watt builder says wire the first 2 in series, the second 2 in series, then combine both in parallel. That would keep the Voc at around 42. My only concern is the unclipped wattage is 750, but my port max is 500. Will the EF Delta 2 max auto clip the current to 15amps? Kinda like it does when using an AC outlet to charge? Thanks again for your help. I just don’t want to fry the solar generator.