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SSR for boil control

PostPosted: Thu Feb 28, 2019 09:26
by AFewTooMany
Hi all,

Looking to setup some form of boil control for 2x 2.4kw elements in my 100L boiler. I can't decide between the simplicity of solid state voltage regulars with 500kohm pots or a pwm controlled standard ssr.

Does anyone have any experience with solid state voltage regulators such as https://www.ebay.co.uk/itm/3X-VolTage-Resistance-Regulator-Solid-State-Relay-SSR-40A-24-380V-AC-w-Heat-Y6U2/202573180344?epid=0&hash=item2f2a4d6db8:g:6D8AAOSwxUlbU0x0:rk:17:pf:0?

Any thoughts would be appreciated

Re: SSR for boil control

PostPosted: Thu Feb 28, 2019 10:07
by Aleman
My personal preference is a Phase angle controller ... This from a post I made some time ago ... I should say I have also used th eUC ones now and they work just as well.

Aleman wrote:You can find Burst fire controllers ready built to do the job, or if you don't mind the EFI then a Phase angle controller is also suitable.

I got mine (PAC not a BFC) from United Automation And I have a 15A one for the boiler and a 6A one for the pump (MM 809HS), although Under Control were selling them cheaper, plus it's difficult to get the UA ones now (I got mine from Farnell quite some time ago), I know people have ordered from UC and been happy . . . .

NOTE That they have to be screwed to a dirty great heat sink if you don't want to have a very reduced life ;)


One thing I should point out is that if you are planning on driving BOTH elements from one Dirty Great SSR is that you will need a Dirty Great Feed to supply it, plus a Dirty Great Big Heat Sink to stop them blowing.

Re: SSR for boil control

PostPosted: Thu Feb 28, 2019 11:31
by AFewTooMany
Going to control each element with a seperate ssr and power supply as I have 2 ring mains within easy reach. I already use a PID controlled SSR for HERMS so thinking I'll have a switched control source (PID or PWM) for one element and second element with just PWM. I would only need to pick up another heat sink and build the two PWM circuits which is the cheapest option for me.

Cheers for the suggestion, but it is a bit more cash than I was hoping to spend

Re: SSR for boil control

PostPosted: Sun Mar 17, 2019 19:36
by BigYin
Your post reminded me to go to my PID build thread - http://forum.craftbrewing.org.uk/viewtopic.php?f=9&t=3578

The image links were knackered, so I've spent an entertaining time fixing all of them, and also realized that PID unit has now been doing service for 9 years! :cheers:

Re: SSR for boil control

PostPosted: Sun Mar 17, 2019 22:07
by Oldstunty
Fantastic 'how to' Big Yin :thumb: :thumb: