SG Ready

[Chair-for-Processor-Design-TU-Dresden]

I have been using BSB-Lan to monitor my heat pump (Brötje Sensotherm BSW K 8B) through Openhab binding for a good 4 years.

I would like to use my excess solar power to trigger the heat pump. Does someone have any idea whether it is possible via BSB-LAN interface? My heat pump is supposedly SG-ready (Smartgrid Ready) and should be able to start heating or circulation, whenever the SG Ready signal is received. However, I have no idea who or how one should send such a signal.

Does anyone know whether any parameter can be set for this? Can one build a (simple) hardware module/relay for this?

Thanks a lot in advance!

[lemon75]

Hello,
just implementing such a feature here for my elco heat pump.
In the documentation the input is described: for me it is a 230 V input which needs to be set to 230 V to tell the heat pump the PV inverter has surplus energy.
In my case I already wired a solid state relay which has a 5 V input for control. This input will be set/reset by the ESP32 which runs the BSB-LAN SW. But I still need to code the SW part to allow my smart-home solution to use this properly.
Hope that helps.
Regards,
Jan

[fredlcore]

I'm sorry that I didn't get back to this discussion earlier.
As for this matter, I'd first look at the different ways to control the heat pump's activity. For example, would it be sufficient to increase the minimum set temperature for buffer (assuming that the heat pump charges a buffer). If that is the case, I'd increase the buffer's minimum set temperature by 10 degrees or so if there is excess PV energy available.
The second thing I'd check is if one of the potential-free inputs (such as H1 or H3) give you the option to define this input to force the heatpump to charge the buffer. The beauty of this is that you would not even need an actual relay to open/close the input, but you could just define the input as active open or active closed with another parameter. For example, I use H1 to put my heater into standby mode (parameter 5950). I used to do this with a relay (controlled by BSB-LAN), but now I just change parameter 5951 ("Wirksinn") to change the "Wirksinn" to inverted and back again, depending on which way I want H1 to work.

If there is really only a 230V input available (which would surprise me), then you could use the Olimex's built-in relays that allow for 220V, if I'm not mistaken. You can control them (on the Olimex) with URL-commands /G32=1 or /G32=0 to turn them on and off (/G33 works likewise).

[jdreesma]

I am working currently on the same topic. As I have a BSW 10 E with the same Controler ISR RVS 61.843-100 as in the BSW K8B.
But I only checked this by reading manuals on the Broetje website. So please double check it ;-)
Suggesting this is your installation manual:
https://polo.broetje.de/pdf/c0027579ge_ih_bsw-k_7300939-06.pdf
please have a look on page 163 -165. Section "Konfiguration" Topic "Funktion Eingang EX1-4 (5980-5992)".
So I suggesting Input ports EX1 and EX2 coud be configured to the SG1 and SG2, what is by factory default, "EW Sperre E6" and "Niedertarif E5" AND important hint... you have to define if the ports are working as NC (normaly close) or NO (normally open) Contact! EW Sperre is by default NO!!
!! please refer your Schematic Diagram in the topcover of your Heatpump!!
Also you have to set 230V on these Input ports , so you should be a electrician to connect the to avoid electrical shock...
The SG Ready Signal should be send by a wide range of photovoltaic inverters or smart managers who observe the 230V power flow and if you have a overflow and could not use it by yourselfe it probably will sent it in the Power grid.
Then the SG Reagy signal could start the Heatpump to store the Power in Warm Water or in the House itselve. 1 or 2 degrees

[fredlcore]

Thanks! I think this is the way I thought it would/should work, except that I was hoping/thinking that inverters would/could send a potential-free signal which could then be used as an input for H1 etc. without the need for an electrician. But if a 230V signal is the norm for inverters (should check mine as well at some point), then the way you are describing is the most suitable one.