Electronics > Power/Renewable Energy/EV's

Wanting to get into solar? Think HOT WATER

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jh15:
Why heat hot water?

HackedFridgeMagnet:

--- Quote from: Zeranin on July 07, 2016, 02:10:11 am ---has no maintenance or reliability issues

--- End quote ---
FYI Hot water tanks are not completely reliable nor maintenance free. Especially if your water is hard. The tempering valves do fail. The elements and thermostats also fail.
Obviously these issues affect both Direct HW and PV hot water though.
I don't see how you can claim your system is lower maintenance when much of the stuff is the same.
I have done very little maintenance on my Solar HW system and it has been running a long time.

Also about your economics, and as it may apply to other people. If you use your house as an example you should include some of  the cost of your solar system which seems to be huge. (?10kw)

Freezing and boiling are not issues for me either. I have a 20 or 30 tube system, i bought it long ago so I cant remember.

These all point to the fact that so much depends on specific circumstances, so you should do a proper analysis before you design or choose your system.
When designing, often the difference between say 85% and 95% solar power is not worth the extra up front cost if you have effective backup.
Also if you DIY then be aware of the regulatory issues and how it could possibly effect your insurance.
In Australia only electricians should be wiring systems above 120V DC.

HackedFridgeMagnet:
I was thinking Zeranin that you should use your Hot water for Hydronic heating so you dont use the straight electric Heaters at night.
Just an idea.

Someone:

--- Quote from: HackedFridgeMagnet on July 07, 2016, 03:44:43 am ---
--- Quote from: Zeranin on July 07, 2016, 02:10:11 am ---has no maintenance or reliability issues

--- End quote ---
FYI Hot water tanks are not completely reliable nor maintenance free. Especially if your water is hard. The tempering valves do fail. The elements and thermostats also fail.
Obviously these issues affect both Direct HW and PV hot water though.
I don't see how you can claim your system is lower maintenance when much of the stuff is the same.
--- End quote ---
Except the direct solar systems have the same storage and pressure valves, and then a whole bunch of extra bits to go wrong that don't exist on the simple electric storage tank. The same with a heat pump, its replacing a resistive immersion heater (cheap and readily available) with a thermal engine that includes pressurised gas and heat exchangers. Its is entirely reasonable to say that the simple solution will be more reliable since it has fewer parts to fail and those parts are almost completely included with the alternatives.


--- Quote from: HackedFridgeMagnet on July 07, 2016, 03:44:43 am ---In Australia only electricians should be wiring systems above 120V DC.
--- End quote ---
You've been shown to be wrong time and time again on Australian regulations. If its not hard wired into the grid or connecting a generating source to the grid you can do what you like, no electricians required. I've no exclusions in my insurance policy for building appliances or systems on my property or in my dwelling. The examples being suggested here as implemented as plug in appliances, or standalone DC systems.

You have direct solar hot water, thats fine. It was probably the most cost effective solution when you installed it. But times have changed and using PV to power hot water storage is now more cost effective, its less complex, and can be done as a DIY modification to existing equipment.

HackedFridgeMagnet:

--- Quote from: HackedFridgeMagnet on July 07, 2016, 03:44:43 am ---You've been shown to be wrong time and time again on Australian regulations.

--- End quote ---
Ok you have made the statement, now point out where I was wrong time and time again.

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