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thermal sensor location on large array?
I'm installing 16 3'x8' Solaron solar thermal collectors. Due to space restrictions they will be mounted in two rows of 8, one row directly above the other, so the overall array will be 24' wide and 16' tall. The panels have internal headers with a single inlet/outlet on the bottom/top. An external supply header will run along the bottom of the first row, and each panel in the first row connected in series to the panel above it, and an external return header across the top. Although not ideal, this series/parallel arrangement is one of the recommended piping layouts in the manufacturers documentation.
I will be using a Tekmar 157 controller. I'm wondering if a single thermal sensor located in a collector on the top row will be sufficient, or if I should use four sensors in a series/parallel configuration to get an average. There will be some partial shading of the array in early morning and late afternoon, so I was thinking that an average reading across the top row of collectors may provide better performance during these times. Would this be overkill or would there be enough benefit to make the added cost of 3 extra sensors and wiring worthwhile?