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How about a solar car port on a budget?


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9 hours ago, tifino said:

not sure @Crossyfrom the photo, as to how much Fall there is to your roof? 

, but I am assuming the Panels are situated  more towards the Higher side? 

 - had that thought arise, due to the amount of recent rains, that the channels may have nearly filled?

-  and thought of just how close is the inundation allowed to be with the Panels? 

 

Fall on the roof is 300mm over the 6m length (I've never seen standing water on the roof), the panels are about 100mm above the bottom of the channels.

 

9 hours ago, Muhendis said:

Those inverters don't appear to have any finned heat sinks. Would it be possible to get some and fit them. If it can be done it would be better than fitting a punkah walla. All moving parts fail sooner or later.

 

There are rather minimal looking fins on the sides, at the rated full-power efficiency of 95% the inverter would be dissipating 20W or so.

 

HTB1pihBRVXXXXclXVXXq6xXFXXXJ.jpg?size=1

 

Also, closer perusal of the somewhat minimal manual does show the inverters hanging vertically under the panels in the airflow. Both inverters are now back in the vertical orientation.

HTB1KgJKbRCw3KVjSZR0q6zcUpXaZ.jpg

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Some of you may remember us building this back in 2015.     Thread here https://forum.thaivisa.com/topic/481794-housebuilding-thread/?do=findComment&comment=9603407  

Warning - solar panels are 'kin heavy when you have to lift them onto the roof 🙂   Finally, the 4 panels are in place.     Panels are fixed using plates and long screws i

Something like this:-  

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1 hour ago, Crossy said:

Also, closer perusal of the somewhat minimal manual does show the inverters hanging vertically under the panels in the airflow. Both inverters are now back in the vertical orientation.

It would be a good idea to turn those inverters 90 degrees so that the "fins" are vertical. Air flow through them will be significantly better. 

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8 minutes ago, Muhendis said:

It would be a good idea to turn those inverters 90 degrees so that the "fins" are vertical. Air flow through them will be significantly better. 

 

Yeah, I was looking at that as part of moving them into the really shady area.

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7 minutes ago, RideJocky said:

And how close are they (the inverters) to the roof panels?
Dropping them down while still in the shade might help.

 

About 100mm clear air above.

 

All great stuff chaps, keep it coming.

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Interesting read , more a project for younger folk to me as i cant see much saving as units here are cheap and our bills not much. Ive had solar on a Motorhome Coach it ran air con in Texas heat all night but installation was costly and one thing no ones mentioned is bird droppings , and dust/ sand sticking after rain ,or cleaning them often to ensure efficiency.They were a novelty at first , but here im a bit doubtful re maintenance.Perhaps if i was younger .!.


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21 minutes ago, alan grice said:

Interesting read , more a project for younger folk to me as i cant see much saving as units here are cheap and our bills not much. Ive had solar on a Motorhome Coach it ran air con in Texas heat all night but installation was costly and one thing no ones mentioned is bird droppings , and dust/ sand sticking after rain ,or cleaning them often to ensure efficiency.They were a novelty at first , but here im a bit doubtful re maintenance.Perhaps if i was younger .!.


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As you say Alan. Payback can be quite a few years even with grid tie and a good feed in tariff from PEA. It depends on how many years you are planning to live.........🙂

If your missus is young and agile, you could send her up onto the roof once a week with a mop and a bucket of water. She'll soon have the panels like new. 

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And here there are several times during the year we get little bugs that land on everything light in color and die making a real sticky mess.  Not too hard to clean but looks terrible until that's done.

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14 hours ago, Crossy said:

They are supposed to be convection cooled, I am trying to avoid using some of my valuable solar to move air.

Could you add a addition heat sink with some the thermal glue...

 

https://www.lazada.co.th/catalog/?q=Heat+sink&_keyori=ss&from=input&spm=a2o4m.home.search.go.1125719cAGMNrP

 

Also have you analyzed your daily energy usage profile to see if you energy needs match up with the solar generation?... I assume your meter does not run backwards?... Or does it?

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14 minutes ago, sfokevin said:

Could you add a addition heat sink with some the thermal glue...

 

Indeed I could, but I shouldn't have to if these things are properly designed.

 

Conventional mechanical meters as supplied by PEA do indeed run backwards just fine although with only 4 panels we've not gone into export as yet.

 

If ours doesn't read backwards on export I'll have to re-think the way forwards, sadly this is going to involve batteries and $$$ 😞

 

 

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1 hour ago, Crossy said:

 

About 100mm clear air above.

 

All great stuff chaps, keep it coming.

plus... situating the inverters directly under roof, that is covered by the panels as well! 

 - gives a doubleup fringe benefit insulating layer, via the 2 stages of shading... 

 

orientation of a heatsink might not in itself add/subtract any measureable benefit regarding heat conduction through the material of the heatsink... 

(the fins themselves would only be a matter of inches in length? and BTU transfer would be more noticeable, relatively, between metal/air interface (convection);

rather than 'within' the relatively smaller bulk of the metal to just itself (conduction) .

 

 

Edited by tifino
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A snapshot of the inverter status just now. As yet the inverters are in full shade under the panels and the roof.

 

inverters-1.jpg

 

Things are a lot warmer than I would like at only 50% rated output.

 

From the numbers, efficiency is a reasonable 93% but we still have to get rid of 20-30W of heat.

 

 

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10 minutes ago, Crossy said:

A snapshot of the inverter status just now. As yet the inverters are in full shade under the panels and the roof.

 

inverters-1.jpg

 

Things are a lot warmer than i would like at only 50% rated output.

 

 

When I was recycling some old PCs in Japan (taking them apart so I didn't have to pay the 2,000 baht to dispose of them ) I took out the heat sinks for parts, that could be a source of cheap ones.

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35 minutes ago, Crossy said:

Indeed I could, but I shouldn't have to if these things are properly designed

In my opinion, commercial products made in China are rarely environmentally tested. China is not a hot country like Thailand so if it works ok there the rest would be down to component level tolerance and thermal consideration. Sometimes the Chinese can be flexible with their specs.

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