It is not done mainly because of the piping issues. 5 panels in parallel will have inconsistent flow charactistics no mater how well it is piped and it must be piped in a reverse return fashion. This is made worse because on of the panels is of a different manufacture. Series connection, with a higher flow rate, will give a more trouble free system even though the final output temp could be higher than desired and the pumping wattage may be a bit higher.
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