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Old 15-05-2019, 11:54   #16
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Re: Duel 240v 12v water heater element

OP youíre going to waste a lot of money buying specialty elements which are mediocre in performance, or a specialty water heater.

Youíll lose about 12% in the inverter. Big deal. Just stick with something that works well.
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Old 15-05-2019, 12:47   #17
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Re: Duel 240v 12v water heater element

I am heating water through my inverter.. I changed the heating element to a 1000 watt 110 volt unit. it consumes 85 amps through the inverter which my solar panels can easily carry. The thermostat on a hot water heater turns it off after approximately an hour
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Old 15-05-2019, 12:55   #18
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Re: Duel 240v 12v water heater element

a friend told me about a setup where he installed a 1-inch tee with two lengths of pipe to accommodate two different hot water heater elements in this hot water heater
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Old 15-05-2019, 13:56   #19
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Re: Duel 240v 12v water heater element

The Australian Duoetto 10litre hot water has 12 and 240v. They list a replacement element here. https://ausj.com.au/product/duoetto-...ement-12-240v/
I will probably buy ine of these hot water systems when i need to replace mine. I use the inverter to heat mine now. You can also order lower power elements. 600 to 750 watts is fine and easier on the batteries than the standard 1500w element. Inverter losses are small compared to the load.
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Old 15-05-2019, 17:55   #20
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Re: Duel 240v 12v water heater element

The OP is obviously looking for a heater that has two separate elements, one for 12v and one for house AC. I agree in this application it is more logical to use an inverter and have a simple AC heater element.

Quote:
Originally Posted by SwellGuy View Post
Strictly speaking, a "dual" 12V / 240V element isn't really possible. A water heater element is just a loop of metal with some resistance, and you run current through it to heat the water. Such a device will behave dramatically differently with 12V vs 240V. One designed for 240V will hardly get warm with only 12V, and one designed for 12V will draw so much current at 240V it'll either explode or pop a breaker.

This doesn't mean you can't find what you are looking for. Who knows, someone might make a single gizmo that is, internally, composed of two separate elements: one designed to produce a useful amount of heat at 240V, and another designed with much lower resistance to produce a useful amount of heat at 12V. Finding such a gizmo that is appropriate wattage for the size of your tank might be difficult, though, since demand for such a gizmo is almost nonexistent.

I think it would be a lot easier to just have two completely separate, standard, ubiquitous, readily available everywhere, 12V and 240V heating elements in your water heater.
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Old 15-05-2019, 21:08   #21
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Re: Duel 240v 12v water heater element

if your inverter is on anyways (for other things) there is really no loss. the main loss is simply having it turned on. generally a few amps.

if you normally shut the inverter off. and the HWT is the only thing you need to power, then you' have some gain by going to a 12v one.

but there is no loss from the batteries weather its coming direct from solar or via inverter while solar charges the batteries.
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Old 16-05-2019, 08:27   #22
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Re: Duel 240v 12v water heater element

As long as the total loads are less than what the panels are producing at that time
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