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Merchant plant to battery forecast input sums inappropriately #825

@brtietz

Description

@brtietz

Describe the bug
If you provide a price of $20/MWh to just the energy market in the merchant plant, the battery will receive a price for that timestep of $20/MWh. If you provide that same price to all 5 markets, those values will be summed, and the battery will assume it's receiving $100/MWh. While the percentage price differences remain the same between steps, the magnitude matters when comparing to the cost of cycle degradation.

To Reproduce
Steps to reproduce the behavior:

  1. Run the attached SAM file: aligned price series.zip
  2. Compare the "power price for battery dispatch" between the all energy market case and the all markets case.

Expected behavior
If we're only going to provide one price signal to battery dispatch, it should be scaled appropriately to the number of markets active. Discuss whether we can use a simple average or a weighted average, and if this needs to factor into the solution for NatLabRockies/SAM#181

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