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Solar power is it worth it

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Posted (edited)
19 minutes ago, Crossy said:

I did think Fort Knox, is the basement full of bullion? Interesting concept, it doesn't float my boat but we all have different tastes.

 

Our home is discussed at length in another thread, but here's a taster, solar is on the car-port right of frame.

Hi Crossy, I know your build. It is without a doubt a very beautiful house. 

 

I set out in my design criteria that I wanted to build an off grid house - designed with solar in mind and super insulated. Compromises have to be made and for me that was the aesthetics. 

 

Being a bit of a prepper, I can confirm that Gold has done well recently.

Edited by Bandersnatch
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Posted (edited)

Well all this talk about power has made me spend money on a whole living room UPS.

Looked at Hybrid inverters ..... too expensive for me.

Settled on a Suoer 1KVA Pure sine wave inverter with built in Solar charger and UPS mode 4kbht, and a Globatt INVA 100ah battery (5kbht).

That should give me 4hrs of living room power for the TV, computer, fibre router and NAS.

(60" Tv + computer  = 260w, other parts router/NAS, HDs, speaker = 50w ........ oddly enough the bloody tv draws 50w when it's off Vs 150w when it's on)

 

Cheaper to use GTIs to generate power, drive the living room from a separate UPS and worry about moving solar cells around if/when a longer term blackout happens. 

Edited by BritManToo

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Posted (edited)
3 hours ago, Bandersnatch said:

 

I explained in detail in my blog why I chose to put solar on all 4 sides of my house. See https://ecohousethailand.com/design-criteria/

Dual Axis Tracker systems can increase production by 40%, but such systems are complex and expensive and with falling solar panel prices it is cheaper to just get more panels.

 

Basically I don't need more power, but I need to extend the hours when the solar is producing and so reducing the hours that the house is running off batteries.  Living close to the equator as we do, North facing panels produce power for much of the day, but more crucially, they are producing at the beginning and end of the day. I am getting power at 6am. 

 

Unfortunately I do not have stats to share currently as there is a problem with the external data module that came with the inverter.

I didn't see the design-criteria before, a great source of ideas that you have documented there! Thanks for sharing.

 

You are right. If you have batteries and want to increase the total time of PV output instead of maximizing the overall total output then you did the right thing in adding panels to all 4 directions. This probably reduces battery wear and since batteries are the piece that degrades the most and is an expensive component so some good "invisible" monetary gains there albeit hard to quantify.

 

Your situation is very very different from the usual case where consumption is normally higher than PV production and also no batteries involved. But since your house is built with energy efficiency in mind and you have batteries the goalpost is different. I can see you spent a lot of effort and thought on all pieces of the puzzle. Kudos!

 

3 hours ago, BritManToo said:

I've got mine mounted flat.

Seems to work, although some people pooh pooh the idea.

Nah not pooh pooh. Just suggesting you could improve on it with minimal effort. And be it just for the improved self-cleaning property due to rain washing off the dirt. Maybe that will reduce the amount of times you need to clean it 🙂

 

  

8 minutes ago, BritManToo said:

oddly enough the bloody tv draws 50w when it's off)


Ouch! That's 140-150 baht per month just for... existing! Wonder what it's doing with all that energy. Good that you are measuring it. Random idea: put a timed switch on it so it cannot draw power in the middle of the night or hours that you know you wont use it.

Edited by eisfeld
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20 minutes ago, BritManToo said:

oddly enough the bloody tv draws 50w when it's off

 

That's scary, what sort of TV is it, CRT, Plasma, LED?

 

Must check ours 🙂

 

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19 minutes ago, Crossy said:

 

That's scary, what sort of TV is it, CRT, Plasma, LED?

 

Must check ours 🙂

 

That's 200mA to power some LEDs. Seems alot. Or 0.6 A for us which is scary.

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Posted (edited)
46 minutes ago, Crossy said:

 

That's scary, what sort of TV is it, CRT, Plasma, LED?

 

Must check ours 🙂

 

LG 60" 4k LED.

Great TV but 30% power consumption when it's off seems a tad high.

On the other hand, 150w when it's on seems beyond reasonable.

The computer running at 100w is less than expected too.

Edited by BritManToo

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If you have a lot of property does it not make more sense to shade the house and put the solar farm away from the house and at about waist level?

 

 

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15 hours ago, BritManToo said:

oddly enough the bloody tv draws 50w when it's off Vs 150w when it's on

MISTAKE!

 

Tv only drawing 7w when off this morning ........ did I misread the meter? or did I leave something else connected?

Senior moment ..............

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7 hours ago, Yellowtail said:

If you have a lot of property does it not make more sense to shade the house and put the solar farm away from the house and at about waist level?

 

Put it just above head height and use it as a sun shade for your seating area.

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Posted (edited)
On 2/21/2019 at 7:07 PM, eyecatcher said:

My monthly bill rarely goes over 600bt and those solar panels probably start at 15k bt for one as big as an A4(paper not Audi)

Just bought 3x 330w panels for 9,360bht (3,000bht each + 360bht delivery). That's about a 2m x 1m solar panel.

And a Suoer 1000w grid tie inverter (3,450bht) to connect them to the grid.

 

Will need to buy some 2" x 1" box steel (about 500bhts worth) and weld some frames together over the next week or so. 

They'll save me 30 units a month of electricity per panel, and I'll be one step more prepared for TEOTWAWKI with the ability to generate my own.

 

Outlay 13,000 bht, return 360bht/month = 3 years to recover my money.

That's pretty good IMHO!

Edited by BritManToo
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1 hour ago, BritManToo said:

Just bought 3x 330w panels for 9,360bht (3,000bht each + 360bht delivery). That's about a 2m x 1m solar panel.

And a Suoer 1000w grid tie inverter (3,450bht) to connect them to the grid.

Great minds must think alike (whilst fools rarely differ...). I just had pretty much the same delivered!

3 x https://www.lazada.co.th/products/330w-torque-330-soler-panel-polycrytaline-330-kerry-i764170884-s1489262718.html?

1 x https://www.lazada.co.th/products/suoer-solar-1000va-24v-220v-mppt-grid-tie-inverter-with-meter-24v-220v-1000va-suoer-gti-d1000b-pure-sine-i341606723-s662990981.html?spm=a2o4m.searchlist.list.21.fe5e54431rJeKG&search=1 

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On 5/17/2020 at 8:41 AM, BritManToo said:

Tv only drawing 7w when off this morning

 

It's still nothing to be sneezed at, we have LED lights that use less and do something useful with it.

 

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1 hour ago, JimShortz said:

I've already had the Suoer D600B with two 330w panels attached.

It's been going over 6 months now, one of the cooling fans buzzes when it starts up, but other than that no problems.

IMG_20200516_133606.jpg

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It always boils down to how long is the pay  out. 10 years, 20 years 25years will you still be alive. Same for elect cars. Solar homes also a waste, to hot in the summer too cold in the winter, just too hot in thailand.

I worked for a National Lab in New Mexico, USA the company would not pay to install that stuff just too much trouble. 

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