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Thread: Fitting a Solid State Relay (SSR)...

  1. #1
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    Fitting a Solid State Relay (SSR)...

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Quote Originally Posted by 426F6B676A060 link=1234688068/62#62 date=1288193232
    SSR rated at between 25-40A would cost in the neighbourhood of $30 +/- $5.00
    Found one that meets the spec (40A and 240VAC), but they supplier recomends to use the optional aluminium heat sink with it. Any tips on that front? They also said its fine as long as its mounted to a metal frame, but I dont think I have much frame space left.

  2. #2
    Mal Dimal's Avatar
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    Re: Fitting a Solid State Relay (SSR)...

    Quote Originally Posted by 04010E0555545351600 link=1234688068/63#63 date=1288218151
    Found one that meets the spec (40A and 240VAC), but they supplier recomends to use the optional aluminium heat sink with it. Any tips on that front? They also said its fine as long as its mounted to a metal frame, but I dont think I have much frame space left.
    If you cant locate it on some bare frame metal (with silicone thermal interface material) then a Heatsink is your only option Im afraid. Theyre not very big units you know, so am a bit surprised that you cant find a spot to attach it.

    Either way, the ideal location would be as far away from the Boiler as is practical, as low down as possible and away from any potential exposure to spilled water otherwise protection needs to be provided.

    All the best mate... :)

    Mal.

  3. #3
    Mal Dimal's Avatar
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    Re: Fitting a Solid State Relay (SSR)...

    [movedhere] Brewing Equipment (non-machine specific) [move by] Mal.

  4. #4
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    Re: Fitting a Solid State Relay (SSR)...

    I am going to use Jaycar CAT. NO. HH8572 $9.95

    High Efficiency Fan Type Heatsink - 75mm Long

    Available in various lengths.
    - 105mm wide.
    - Thermal resistance 75mm unit 2.5 C/W;

    http://www.jaycar.com.au

    just remember the SSR is going to be using *5A to 6A (1200W to 1440W) and the duty cycle is only 1/5 or less, it only going to be working hard when warming up from cold first few minutes after that it just a brief pulse to stay at brew temperature. Steam uses original steam thermostat and not the SSR.

    my gaggia baby is plastic case , currently using internal PID relay and 20s response time, but will use SSR with Heatsink and 2s response time.

    by the way i got a 25A SSR for for $10 from sure electronics, they also on ebay, they also sell PID $31

    http://www.sure-electronics.net/

  5. #5
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    Re: Fitting a Solid State Relay (SSR)...

    The heat that the SSR needs to dissipate is the voltage drop (usually 2V) times the amps the element draws.

    So if an element is 2400Watts it is drawing 10amp. So the energy that SSR will use is 10amp time 2volt = 20Watts.

  6. #6
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    Re: Fitting a Solid State Relay (SSR)...

    Behmor Brazen - $249 - Free Freight
    here is a detailed data sheet for some SSRs

    http://www.opto22.com/documents/0859_Solid_State_Relays_data_sheet.pdf



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