Excess Power Utilised
How about a simple means of diverting EXCESS P.V. power into something useful for those of us on Stand Alone Systems. For example, Water pumping.
Just add a relay between PV array and your batteries and control it with aux relay. I have done this with an FM30 and a Lorentz swimming pool pump. in the summer it PV is used to pump pool and in the winter it charges the batteries. but easily automated if you want.