I am particularly interested in how the zero export device works.
What are the principles involve?
How does it work?
Does it check the currect phasing with regards to that of the voltage?
I’d be interested to know too, hopefully someone can shed some light.
I spoke to someone from ZED 1 about the product a few years ago, but apparently that company has gone under. Not sure what is on the market now.
What is the circumstance you are using it for? There doesn’t seem to be a lot of demand for it, since most electricity distributors in Australia allow you to oversize the inverter, which effectively gives the same result.
It’s actually quite a simple device to export limit.
An ‘energy meter’ is used to measure total energy flow to and from the site. The energy meter uses a ‘current transformer’ (CT) which is clamped around the main supply cable and measures the current flow in either direction.
The energy meter (CT) is connected to the solar inverter and lets the inverter monitor the consumption and how much energy is being exported. The inverter can limit the amount of solar production based on the set export limit.
Below is an diagram from solarEdge