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Two power sources

 
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Hopsteep




Joined: 10 Nov 2019
Posts: 3
Location: Essex


PostLink    Posted: Tue Nov 12, 2019 4:18 pm    Post subject: Two power sources Reply with quote


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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!



DPDT.png
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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


PostLink    Posted: Tue Nov 12, 2019 4:32 pm    Post subject: Reply with quote

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

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Hopsteep




Joined: 10 Nov 2019
Posts: 3
Location: Essex


PostLink    Posted: Wed Nov 13, 2019 2:15 pm    Post subject: Reply with quote

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


PostLink    Posted: Thu Nov 14, 2019 10:41 am    Post subject: Reply with quote

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
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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


PostLink    Posted: Thu Nov 14, 2019 1:22 pm    Post subject: Reply with quote

You would have to ask the manufacturer of the SSR.

With two SSRs (or any load for that matter) in parallel, the current draw doubles. SSRs are, generally speaking high impedance devices so the current draw is negligible. I would be surprised that any PID wouldn't have the capacity to drive at least 2 SSRs.

If you're not sure, the ones we sell will work fine together with up to 5 SSRs:

PID: https://shop.theelectricbrewery.com/collections/temperature-controllers/products/syl-2352-pid-temperature-controller

SSR: https://shop.theelectricbrewery.com/collections/ssrs-relays-contactors/products/40-amp-ssr-12v-dc-input-240v-ac-output

Kal

_________________
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