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HI

really interested in solutions for own consumption optimization with thermal storage.

Looks like a good solution sofar, let me add perhaps some comments from my side:

First let me add, that i really don't like the phase angle control since it is messing up the Sine Wave.

I would prefer either the solution of having Heating rods connected to the DC side for DC coupled Solar and switching them On by increment (200W+200W+200W).

Or for AC Coupled Solar System a Heating rod connected to a PWModulation of the output voltage (e.g. My-PV or Fronius Ohm pilot or Solar fox). Advantages longer lifetime of the Battery Inverter.

For Offgrid System (AC Coupling or adjustable output frequency) it is very easy to realize, since the Frequency shift control, is providing a communication on the AC Bus already which can be used without any additional control (when frequency rises above 52Hz start dumping energy into the Thermal storage)

BR

Oliver

I headed in the same direction your are, except I going to try out a Crydom PMP2425W Proportional Relay. My post in "Mods" is:

https://community.victronenergy.com/questions/7170/calculating-and-controlling-excess-pv-power.html

Should be fun.

Pat

Success, so far. Got my PLC Ladder program finished and it is passing the correct values to my analog output. Tomorrow I am going to install the relay in the system and "smoke test" it.

My new O-scope stuff should arrive on Monday and, once I figure out how to use it, I can send you some screen shots of what's really going on.

Pat

Lucian,

Got the Crydom Proportional Relay hooked up and ran my PLC program. Everything worked as expected. I used an incandescent light bulb as my load. I can see why Burst Mode is not recommended for lighting. At the lower amperage settings the lamp flashed like a strobe, it settles down at higher settings. Going to see if I can find an old style radiant heater, to see how it works with a higher amperage load.

Burst Mode should work fine for a heating element.

Can't wait to get my scope on Monday and see what the Phase Angle and Burst modes really look like and how they may effect my Quattro.

So far, so good.
Pat

Lucian,

Finally got my scope and probes setup correctly. Hopefully the data makes more sense. I added a measurements section at the bottom of the screen. The parameters of the test were:

1. 1320W IR Heater load.

2. Relay set to 12.5A output (50% of rated power).

Pat

Burst Mode Voltage measured at Load

Burst Mode Voltage measured at Source

Phase Mode Voltage measured at Load

Phase Mode Voltage measured at Source