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Hopsteep
Joined: 10 Nov 2019 Posts: 3 Location: Essex
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Link Posted: Tue Nov 12, 2019 4:18 pm Post subject: Two power sources |
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Hi there,
I'm new to the forum. I've been searching on here to see if this has been asked before but I couldn't see anything. Apologies though if I've missed it.
I'm in the early stages of designing a control panel. The panel will be for a small two vessel system running two 2kw elements (UK mains 230V). I want to use two (maximum load 13A each) power inputs so that my system remains portable and ultimately saves me having to fit a dedicated power supply in my garage.
My first thought was to use a DPDT relay, with one part of the relay powering one element and a pump, and other other part powering my second element. Please excuse the very rough diagram attached.
I'd then like to use a single PID to control both of the elements. Could I use two SSRs (one for each element) and connect the low voltage feed from the PID into each of them?
I'd really appreciate any advice and thank you in advance!
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11116 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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Hopsteep
Joined: 10 Nov 2019 Posts: 3 Location: Essex
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Link Posted: Wed Nov 13, 2019 2:15 pm Post subject: |
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That’s great thanks for confirming that. Some great stuff on here- I’ll keep reading and no doubt be asking for some more advice as I get into the build.
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Hopsteep
Joined: 10 Nov 2019 Posts: 3 Location: Essex
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Link Posted: Thu Nov 14, 2019 10:41 am Post subject: |
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kal wrote: | Hi and welcome to the forum!
Generally speaking what you propose will work. However, some will say that for safety reasons it's better to not combine circuits inside a single device, that the powering circuit should be sized for the device that is using it.
Make sure the PID you use can drive more than one SSR. Ours here can drive 5 in parallel: https://shop.theelectricbrewery.com/collections/temperature-controllers
Cheers!
Kal |
Looking at my PID it’s output is rated 12v DC 30mA. I’m not sure what the draw of a 40A SSR would actually be. It will operate from 3 to 32V DC but that doesn’t really help.
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11116 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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