How do I make the best use of an excess 10-19 kW of electricity during sunny days? In practice, this means between 10.000 - 19.000 Watts of "free" household electricity from 9 am to 4 pm.
I have an unfortunate problem. I built a 37 kW solar power plant. It's grid-connected, but the grid can only accept 14.4 kW. In the winter months when the sun is low, this is fine. The entire array rarely peaks over 14 kW. But in the summer months when the sun is high, the plant will always make excess electricity. The grid cannot take it and I currently don't have a way to spend it locally.
The power grid wants me to pay for the local grid upgrade if I want to send them higher throughput. They communicate with me only in written form and reply once every 6 months. At this pace, it will take a year before I even get a cost estimate and then more time before any progress is made. The kicker is, the grid will resell my energy to other people but won't pay me for it. I get credit for it, but I have to use it for electricity consumption by the end of the year, or they consider it a gift and reset the counter at the end of each year. Their rationale being "private solar power plants are meant for self-consumption, not profit".
So for the excess power, it's a "use it or lose it" type of situation. How can I use it to recover the cost of equipment, or god forbid, make some money?
Any good solution should take into consideration that the excess is:
only half of the year (from mid April to mid October)
only during sunny days
only during peak hours (9am - 4 pm)
is unpredictable during partly-cloudy weather
can only be used within the household