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Zero Feed-in priority


Keith

Question

i have a Multi with Fronius AC coupled and Zero Feed-in. All loads connected to the Multi out 1 and 2.

The control works BUT at the expense of maximizing solar power. All is fine with steady loads. However, in a domestic situation there are often loads that are on/off control (iron, stove plate, oven). While this is on the ccgx controls the fronius output like a yoyo, except down instantly and recovers slowly by which time the load changes again.

Would it make any difference if i had out 2 loads direct on the grid, installed a meter to create a new zero point. Would the load fluctuation in this connection have the same effect on the control. From an electrical connection it is the same as having then on out 2 but from metering and control it might have a different outcome? anyone know if it would be different?

Would like to have Adaptive Control whereby the system learns that say 60 % energy is going to come from the grid, so maximize solar input by adding battery charging and let the grid take up the yoyo load.

Out of interest. How does the control handle fluctuating loads on a Multi with only DC charge controller? Is the solar more maximized in this configuration.

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On 2019/10/12 at 10:25 AM, Keith said:

except down instantly and recovers slowly

This is pretty normal for almost all brands. Backing off the power is easy and fast (just adjust the mark-space ratio of your DC/DC converter until the power level is down), but ramping up is always a bit slower since you're scanning for the maximum point.

Also, in the Victron ESS setup the power limit on the PV inverter is only updated every 5 seconds. Considering the average washing machine/laundry iron pattern, I can see how that might conflict a bit.

On 2019/10/12 at 10:25 AM, Keith said:

installed a meter to create a new zero point

You can do that, but there's some caveats to that. You have to set the ESS grid setpoint high enough so that the two systems fight each other and any surplus energy is imported and/or used to charge batteries. And of course such a setup is not supported by Victron.

On 2019/10/12 at 10:25 AM, Keith said:

Would like to have Adaptive Control whereby the system learns that say 60 % energy is going to come from the grid, so maximize solar input by adding battery charging and let the grid take up the yoyo load.

Set a higher grid setpoint then?

On 2019/10/12 at 10:25 AM, Keith said:

Out of interest. How does the control handle fluctuating loads on a Multi with only DC charge controller? Is the solar more maximized in this configuration.

With DC-tied charging, as long as you have space in the batteries, it runs flat-out. No limiting. Once the batteries are full, there will always be a bit of yo-yoing going on.

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