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Author Topic: AC/DC Geyser Element  (Read 205 times)

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Offline windswept

AC/DC Geyser Element
« on: July 11, 2018, 10:29:43 am »
Has anybody installed one of these? It can work off PV panels or mains.
 

Offline RobC

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Re: AC/DC Geyser Element
« Reply #1 on: July 11, 2018, 10:59:09 am »
Has anybody installed one of these? It can work off PV panels or mains.
A geyser element is actually just a resistor... it will work with ac or dc as long as the voltage is equivalent. The thermostat part may baulk at DC though?
 

Offline Welsh

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Re: AC/DC Geyser Element
« Reply #2 on: July 11, 2018, 11:01:31 am »
Has anybody installed one of these? It can work off PV panels or mains.
A geyser element is actually just a resistor... it will work with ac or dc as long as the voltage is equivalent. The thermostat part may baulk at DC though?

I thought the same Rob, but also the thermostat should also not see an issue in my opinion?
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Re: AC/DC Geyser Element
« Reply #3 on: July 11, 2018, 12:16:10 pm »
It can work off PV panels

Really ? Is it even possible with PV panels ?
 

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Re: AC/DC Geyser Element
« Reply #4 on: July 11, 2018, 12:27:52 pm »
Ping Drazil.
He knows elements
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Offline dieseldawie

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Re: AC/DC Geyser Element
« Reply #5 on: July 11, 2018, 12:30:35 pm »
Not sure why you would want to do this. ?.

Limit would still then be 230V DC? That is something that I would not like an in my house

Your PV panels would normally go through a controller anyways and the output would then be AC
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Offline Lourens ツ

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Re: AC/DC Geyser Element
« Reply #6 on: July 11, 2018, 12:49:52 pm »
Will a geyser work on DC, yes. It is just an electrical element.
Will the thermostat work on DC, yes. It is just a switch controlled by heat.

In theory a geyser will work with DC.

BUT, because the kW rating of the geyser doesn't change you'll need to consider a few things, like rather installing a LP Gas geyser.

There are far better ways to heat water.
Even when heating it electrically it would be unwise to heat a reservoir of water like a geyser.

A smaller in line heater will be far more effective if you must use electricity.

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Re: AC/DC Geyser Element
« Reply #7 on: July 11, 2018, 12:59:57 pm »
Thermostat, which opens and closes a contact, might generate bigger arc between the contacts when opening in a DC circuit. Arcs erode the contacts (or worse, it can fuse them together). Thermostat will not like this. When using DC, use a much lower voltage (reduces current, and thus arc flame length) or use a thermostat rated for DC switching.

Element will be fine.
« Last Edit: July 11, 2018, 01:01:07 pm by OomD »
 
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Offline Welsh

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Re: AC/DC Geyser Element
« Reply #8 on: July 11, 2018, 01:04:26 pm »
For water heating surely a solar water heater would be way more efficient than PV to a geyser element?
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Offline RobC

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Re: AC/DC Geyser Element
« Reply #9 on: July 11, 2018, 02:11:47 pm »
For water heating surely a solar water heater would be way more efficient than PV to a geyser element?
Absolutely... using PV current is a waste in this application, the solar geyser is more efficcient at converteng solar radiation to thermal energy.
But if you have only PV then as a stop gap it would work.
 

Offline windswept

Re: AC/DC Geyser Element
« Reply #10 on: July 11, 2018, 03:02:53 pm »
Thanks for all the advice. I have seen a few of these installed in my area and was wondering what the advantages are of this system. :thumleft:
 

Offline windswept

Re: AC/DC Geyser Element
« Reply #11 on: July 13, 2018, 01:55:02 pm »
Spoke to the plumber that installs them. Minimum three PV panels, one controller, one element and two other electronic gizmos. The cost around R18k, and that's without the geyser. :eek7: Tink I'll stick to water panel.
 

Offline dieseldawie

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Re: AC/DC Geyser Element
« Reply #12 on: July 13, 2018, 03:27:43 pm »
I think the advantage is that PV panels work on light on not just direct sunlight so maybe you still get hot water on cloudy days??
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Offline Sláinte Mhaith

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Re: AC/DC Geyser Element
« Reply #13 on: July 13, 2018, 03:37:54 pm »
.