HI, @Barbara.
I have previously posted about importing my provider’s prices using their API and Node-RED. Today was a prime example of negative prices through the peak of the day’s solar production: I was being paid to use grid power at up to $0.30/kWh, but DESS wasn’t apparently able to make use of it.
Given I was also being charged $0.36/kWh to export my solar to the grid, I’d also like to think that DESS would throttle my Fronius inverters to zero and run off the grid.
Evidently that didn’t occur, so I went about adjusting setting the inverter’s AC Power limit to zero using dbus:
dbus-send --system --print-reply --dest=com.victronenergy.pvinverter.pv_78_942054 /Ac/PowerLimit com.victronenergy.BusItem.SetValue double:0
That works for a while, however, some minutes later, the inverters are set back to full-throttle (presumably by some part of ESS).
It doesn’t feel like an optimal way of handling the situation! Should DESS automatically optimise for the favourable grid pricing and negative solar feed-in prices when prices are set via the “fixed” mode? Trying to understand if this is a limitation of DESS or my misconfiguration.
Cheers,
Andrew