I looked at the documentation on the Morningstar MPPT-45 this morning. It has four auxiliary relay control outputs (open collector, I presume) but I can't find much in the way of an explanation how they are programmed. The operator manual refers me to the website which refers me to a data sheet on the relay drivers which refers me to the manual. Morningstar has a good reputation but this is not comforting.
My guess is that an output could be programmed as a load dump. I just haven't found the information.
The Morningstar is about double the price of the Renogy MPPT-40A. This could be justified by the Morningstar's PC connectivity options. Perhaps the software interface manual will tell me more about the output programming features. I like the Modbus interface. If the software is any good it would replace the need for a separate battery monitor.
Grid tie seemed like a good way to utilize otherwise wasted energy. Then I read the power company's requirements. So much for that idea.
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