Hi. I would like to control a geyser with either the Venus relay or Multiplus relay. The relay must close when the batteries are full and there is enough PV coming in from a PV Grid Tie Inverter(ABB).
Is there a way to do this?
asked
Venus/Multiplus Relay to control a geyser
I have nothing to add, but I find this discussion fascinating. I assume you are talking about geothermal energy conversion to electrical power, and it's control. If not, what is a "geyser" in this frame of reference?
Thanks,
Pat
Hi Pat
Sorry about the confusion. In Southern Africa (I'm originally from Zimbabwe) a geyser is the term used to describe a hot water heater.
Controlling a geyser is not something that is available directly from a Venus device of Multi.
Due to so many different parameters for geyser element power ratings and PV power ratings it's difficult to implement - but it would be nice. There are methods to do this on a case by case basis, taking readings from the Venus device over ModbusTCP and using that data to be processed with your own custom device.
Another method, the one that I use, is to use an external unit which monitors if any energy is being exported to the grid. If so it will PWM control the geyser element with just the that amount of power to prevent grid export.
Something like this: https://www.cclcomponents.com/marlec-solar-iboost-solar-immersion-heater-control
Thanks. the relay would be controlling a normal 230V contactor, so no load on the relay.
