AndreFvdM

interesting automation. What relays do you use ? I am weary of the high voltage DC spark on disconnect. Would SolidState relays work ? which model number ? Maybe then I can make a MPPT(pseudo) to track the panel Vmp. Although that would add complexity. With direct connection my peak power is at ~36V, but the panel spec is Vmp=42V.

true, energy in -> energy out. If you don't have solar power then you won't have hot water. Sure you can overpanel in series use a MPPT to buck it down. On cloudy days my HomeAssistant would start the heatpump as soon as batteries SOC reach 100%. The heatpump draws 1100Wat and hear the 2x150l geysers (in series) is just over an hour. But the heatpump is my backup. The PTC is pushing 550Watt into the geyser as we speak. Sure it will take 12hours to heat 150l from 20 to 70. But I can connect another panel, or even insert another PTC into the other geyser. Point is that the energy is for free, and it works without a R4000 MPPT controller.

I am doing just that right now. 620Watt 48Voc panel directly connected to the Geyserwise 900Watt element. Victron SmartShunt inline to monitor. (no MPPT, no PWM)

Hi, how did you integrate your ITS heatpump into your smart home system ? I want to integrate mine into Home Assistant.

good idea to monitor the frequency ! I will try that in HA. (I am rather using HA control than NodeRed). thanks

Hi all, HomeAssistant is quite stable on RPi4, and quick to switch Sonoff devices on load demand during load shedding. During the day with high solar power available, devices can run, but during the night, power management is important to extend battery life. What is your strategy on deciding which devices to switch, and on what triggers ?

any update on this ?

I bought a house with twin geysers in series. A heatpump heats by reverse direction circulation. I added a Geyserwise DC solar to the second (outlets to the house) geyser. I monitor&plot all pipe temperatures in/out of geysers. Some interesting graphs. I am now considering adding a solar powered circulation pump to push hot water back from the second geyser to the first geyser (but only when the second geyser has reached 45Celsius), and off course when the solar GeyserWise is heating. This means that, when I shower in the evening, the first geyser will feed semi-heated water into the second geyser, instead of super cold water. This means I can run both geysers on 45C, instead of on 60C, so the heat lost during the night is less. comments ?

Did you come right ?