PV hot water tank

Forums › Home Workshop DIY › PV hot water tank

tweake

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#306984 10-Sep-2023 16:21

any recommendations for a hot water tank that i can do a solar panel direct to element system on?

mines just started leaking so its a bit of a rush job as i was hoping to do it in a few years time.

eracode

Smpl Mnmlst
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#3125657 10-Sep-2023 18:17

PV is ….?

Sometimes I just sit and think. Other times I just sit.

huckster

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#3125658 10-Sep-2023 18:25

Methinks photovoltaic

tweake

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#3125659 10-Sep-2023 18:33

yeah, electric solar panel wired to a heater element rather than the water panels circulating the water.

traderstu

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#3125671 10-Sep-2023 20:11

I stumbled across this recently, is this the type of thing you're after?

"Green Heat provides an affordable solution to save energy usage in homes with smart control and direct photovoltaic (PV) solar water heating"

tweake

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#3125675 10-Sep-2023 20:22

traderstu:

I stumbled across this recently, is this the type of thing you're after?

"Green Heat provides an affordable solution to save energy usage in homes with smart control and direct photovoltaic (PV) solar water heating"

thats the fancy version.

cheap version is you use a standard element (matched to the panel) wired direct to solar panel (with thermomost of course). i'm not sure on the tank. at the moment i'm looking at getting a two element tank. but i'm not sure if they use two thermostats. the idea being is to use solar on one element and the stock ripple controlled on the other.

fe31nz

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#3125710 11-Sep-2023 00:20

With PV hot water, the best option is a heat pump hot water cylinder. In Australia there are heaps of competitors selling this combination as it pays for itself rapidly, but for some reason that is not a common thing in NZ. Just putting PV power into a normal hot water cylinder takes much longer to pay for itself, despite the much higher initial cost of the heat pump cylinder.

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wellygary

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#3125871 11-Sep-2023 09:38

fe31nz:

With PV hot water, the best option is a heat pump hot water cylinder. In Australia there are heaps of competitors selling this combination as it pays for itself rapidly, but for some reason that is not a common thing in NZ.

A quick google scan shows there are both Federal and state government subsidies available for HW heat pumps in OZ, https://www.energy.gov.au/rebate-topic/hot-water

I suspect its something to do with customers being exposed to global pricing for LNG and coal...