Read the manual for your unit, but I think the delta pro can handle the solar without any further equipment. The panel configuration may have to be adjusted depending on the panel specification. The input port for solar, port 13, is a XT 60 connector, you may need an adapter, or it been provided with the unit.
Maximum allowed input volts are 150 volts and maximum current 15 amps. This is the limit. ( UK specification)
Without knowing the panel specifications, the array setup can not be determined.
For example if the panels were Renogy 200 watt, 10.4 amps, volts open circuit 23, would seem to limit to 6 panels in series. (138 volts). To allow for cold temperature an allowance needs to be made as Voc increases 0.3 to 0.4 % per degree centigrade below 25 deg C (77F)
For example if expected to operate at 0C there will be a voltage increase of 10 to 14 volts. Since this exceeds the maximum votage of 150 volts the series string is limited to 5 panels.
Of course you can have parallel strings, with equal numbers of panels, to increase the input power but you hit the 15 amp limit ( no damage should occur, unlike exceeding the voltage limit, the delta pro just ignores over 15 amps) .
Watch for ideas.
