A Blue Sky solar charge controller will only regulate the input from either a solar array or wind generator. It will not control the charging process when in grid power, but will still operate regardless when plugged in.
The PD 4655 is still your least expensive option for on-grid charging, even though it's not perfect.
If you intent to increase the size of your solar array and use an MPPT charge controller, you should first check that all of the panels' output voltages are within 0.3VDC, as at larger differential will confuse the MPPT function.
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