Hi,
I'm designing a power system for an off-grid house that has a number of significant power consumers: two hot water cylinders (1+1+2KW), an electric car, an electric oven (3-4KW) and various kitchen appliances (kettle: 2KW). The power system consists of AC coupled PV inverters and a MultiPlus-II.
A control system decides where available power goes at which time, for example if someone requests power for the kettle by pressing a button and the hot water cylinder is being heated, that will be turned off or, ideally, regulated down before the kettle is switched on. Once the kettle is done, the system can decide to switch the hot water cylinder back on.
We're now going into our Southern Hemisphere winter and sunshine is getting a lot more patchy.
The electric car's charging is controlled by an OpenEVSE controller which is following the excess solar power. I would like to do the same for resistive loads, for example with something like this.
It would be great if the HWC could be regulated down & up closely following solar power generation.
According to the documentation of this dimmer, dimming can be achieved by Pulse Skip Modulation:
- Method 1 — One or more cycles (sine wave signal) are transferred to the load, while following one or several cycles are blocked.
- Method 2 — Partial transferrence of each sine wave to the load.
There is a concern that the resulting AC current wave is "dirty" and possibly not "really" legal on the grid. Would anyone be able to comment if this dimming would have any adverse affects on the MultiPlus? There can be multiple consumers all being "dimmed" at anyone time.
regards,
Jan