1. Gavin Taylor

    Really interesting to come across your hack for the boilermate 2000
    I have one of those systems and also have 5.8kw of solar which i would love to use with the electric heating element during the summer, rather than gas all the time.
    I seen that it has 2 x 4.5kw heating elements , which i could use just one or wire them in series (2.25kw) but i read in the instructions the electric element runs the hot water at a higher temperature and runs all the time. Iv designed a system to read how much solar is being produced and switch a relay on or off when gets to a certain level.
    Have you got any ideas on how the switch side of it operates ?

    • Mal Hubert

      Hey. My system has a physical switch to turn on the electric element into “Emergency HW” or “Emergency HW and Heating” mode. Covered by this:

      http://www.boilermanuals.org.uk/boilers/Gledhill/boilermate%202000.pdf Page 25

      Instead of the Glasslin “Clock” I have a Honeywell Thermostat in at the minute.

      Maybe desolder the knob and have a separate microcontroller and relays to emulate that manual switching between Normal (Gas) and Emergency HTG&HW modes when the solar is above a threshold.

      I’m not 100% sure the schematic of that XB386 PCB behind the switch, it appears to light the LEDs, and cuts off the switched live to the HTG and HW pumps depending on what mode the switch is in.

      I would be tempted to redesign that board to let it drop a PSU and ESP8266 on it.

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