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solarozq

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Posts: 19
Reply with quote  #1 
1-IMG_20180530_145701.jpg About 10 years back I installed two solar hot water heaters. Each consisting of a header and 20 vacuum tubes. Water is drawn by pump from the drain on my standard hot water tank and returns by gravity to the top of the water tank. Works very well and the feed pump is controlled with a small programmable controller. The same controller only allows additional tank heating at times when the solar voltaic panels are generating at peak.
About 5 years back I added a small solar voltaic system 3kw inverter and 1.7kw in panels. Recently I have added more panels to bring the system up to near the inverter rating. I added thermostatically controlled fans to keep the inverter well within its normal temperature operating range. I've had a few days above 20kWh's so I'm pretty happy. 
I have also built a small basic solar air heater just to see if I could. See my YouTube 


myk3y

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Posts: 31
Reply with quote  #2 
Cool job, Bob. :)

DIYsolarGuy

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Posts: 21
Reply with quote  #3 
I like it, if you had to guess, how much do you think you are saving with the solar heater you built versus using your conventional heater, to heat that same room? I realize that a bigger solar heater would generate more heat and save you more.
stmbtwle

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Reply with quote  #4 
You have to also consider the cost of the equipment vs the "duty cycle". Here in the Southern US where we only need heat a month or two, it's not worth it.

PV is another story as it works year round.

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stmbtwle

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Reply with quote  #5 
You have to also consider the cost of the equipment vs the "duty cycle". Here on the US Gulf where we only need heat a month or two, IMO it's not worth it.

PV is another story as it works year round.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
myk3y

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Reply with quote  #6 
Queensland is pretty tropical, but it still gets cold at altitude in the Tablelands.

Same as North Island NZ - tons of sunshine, moderate climate, but when you’re at 300M+ it gets cold at night in winter. And when you’re at 1000M, it can get downright freezing.

Timber is pretty cheap. Much cheaper to make something like this than to burn a tonne of wood.
solarozq

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Posts: 19
Reply with quote  #7 
Quote:
Originally Posted by DIYsolarGuy
I like it, if you had to guess, how much do you think you are saving with the solar heater you built versus using your conventional heater, to heat that same room? I realize that a bigger solar heater would generate more heat and save you more.

The solar heater users almost no power maybe 20-30 watts, the smallest heater would be 1000 watts so it is a big saving. Because I am in Queensland there are only 3 winter months in a year to use it. We are now in late spring so it's currently resting. 
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