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Old 02-01-2013, 12:11 AM   #1
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Default Has anyone tried these SSRs?

I was looking for some mechanical relays to control my pumps, a compact mini fridge, and some ferm wrap (all items under 2 Amps individually).

I ran accross these SSR boards with 8 2A SSRs and I was wondering if anyone has had any luck with them in their breweries. Would they need a heat sink of some kind if I were pulling 1 - 2 A per relay?

http://www.amazon.com/SainSmart-8-Ch...ef=pd_sim_pc_2

51oeultoy8l__sl500_aa300_.jpg   51ir91zcvjl.jpg  
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Old 02-01-2013, 01:26 AM   #2
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If it gets hot you could run a fan across it. But it won't.

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Old 02-01-2013, 02:05 PM   #3
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Looks promising...Try running something drawing its normal load and monitor the temp of the SSR with a laser/infrared temp gun. If you find that they do run hot, you can find those small stick on heat sinks meant for computer memory, like these: http://www.amazon.com/Cosmos-Copper-...memory+hatsink

I'm not sure if SSR's really fall into the same category, but it seems to be a rule of thumb to run electrical devices at only 80% of the rated load continuously. In this case, that would put you at 1.6A

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Old 02-01-2013, 03:10 PM   #4
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I could be wrong, but I don't think there will be room for those heatsinks.

I would be more worried about inrush current from the pumps than continuous current on the heater etc.

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Old 02-01-2013, 11:59 PM   #5
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Those relays are rated at 2 amps @ 240V. Assuming your devices are really 110V, that gives you more headroom.

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Old 02-02-2013, 12:14 AM   #6
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Your post says you're looking for mechanical relays, but you've linked to solid state relays. You're not gonna want to switch a fridge or pumps on/off that fast. Why not look at this SainSmart 8-Channel 5V Relay Module for Arduino DSP AVR PIC ARM or the 4-Channel version. They're cheaper, rated at 10 Amps and would be better suited for the loads you're switching. I also think you'll need a micro controller to get things working right.

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Old 02-02-2013, 01:01 PM   #7
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Quote:
Originally Posted by pickles View Post
Your post says you're looking for mechanical relays, but you've linked to solid state relays. You're not gonna want to switch a fridge or pumps on/off that fast. Why not look at this SainSmart 8-Channel 5V Relay Module for Arduino DSP AVR PIC ARM or the 4-Channel version. They're cheaper, rated at 10 Amps and would be better suited for the loads you're switching. I also think you'll need a micro controller to get things working right.
I just ordered my BCS 462 yesterday so I am starting to source the various components. I was looking at those 10A relays and stumbled upon the 4 and 8 channel SSRs but I hadn't read anything on the forum about them.

Do SSRs HAVE to switch on and off at a high frequency? I thought they just COULD so were preferred over mechanical relays for PID. I want to use these smaller SSRs to control my ferm wraps and hop auger (both super low amps) so I can utilize the PWM functions of the BCS. Do you think that would work?

So would you reccomend a four channel mechanical relay for my three pumps and fridge and then use the four channel SSR to control the lower voltage items?
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Old 02-02-2013, 01:30 PM   #8
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Yeah you're correct, they should be able to cycle on/off slower if the input dictates. I guess I was thinking SSR is synonymous with PID (it's been a while since I built my Brewtroller). I guess it's really over kill for the pumps and fridge but would work as long as you're not exceeding the amp rating. It's probably a wash cost wise between buying two small boards vs the one SSR board, so I'd go with the single board. Sorry, I'm done meddling, back to the task at hand

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Old 02-02-2013, 01:46 PM   #9
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Quote:
Originally Posted by pickles View Post
Your post says you're looking for mechanical relays, but you've linked to solid state relays. You're not gonna want to switch a fridge or pumps on/off that fast. Why not look at this SainSmart 8-Channel 5V Relay Module for Arduino DSP AVR PIC ARM or the 4-Channel version. They're cheaper, rated at 10 Amps and would be better suited for the loads you're switching. I also think you'll need a micro controller to get things working right.
That's correct for the fridge but DC pumps you might want to use PWM to adjust the flow rate. This would require SSRs not mechanical relays.
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Old 02-02-2013, 05:47 PM   #10
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Quote:
Originally Posted by pickles View Post
Yeah you're correct, they should be able to cycle on/off slower if the input dictates. I guess I was thinking SSR is synonymous with PID (it's been a while since I built my Brewtroller). I guess it's really over kill for the pumps and fridge but would work as long as you're not exceeding the amp rating. It's probably a wash cost wise between buying two small boards vs the one SSR board, so I'd go with the single board. Sorry, I'm done meddling, back to the task at hand
Pickles, I checked out your rig and you can "meddle" all you want. That thing is sweet and really similar to what I am trying to set-up...two tier, three vessel, tube RIMS with bottom drained HLT and MLT. Any sage advice, things you have learned along the way?
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