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How about a solar car port on a budget?


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4 minutes ago, Muhendis said:

Sometimes the Chinese can be flexible with their specs.

 

Indeed they can, I will talk to the manufacturer next week, their support chap has been very responsive thus far.

 

Currently pushing 800W from the two 600W inverters and 4 x 300W panels, inverters showing 63C and 64C.

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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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2 hours ago, Crossy said:

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 $$$ 😞

fwiw, your load profile seems to show your instantaneous power going close to negative, not the 15-minute average. That might make a small battery work ok in balancing your output with load. 

 

The double micro-inverters seem like an uphill battle on heat dissipation. Do you know your thermal coefficient for the panels?  Rule of thumb is to size the panels 10% larger than the inverter, but that doesn’t help the economic calculation. 

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From Kaideng support regarding inverter temperature.

 

Quote

Good day,

 

It is normal for the surface temperature to exceed 60°. Our maximum surface temperature can reach 70°. If it exceeds 75°, it will have a protection mechanism. This is called over-temperature protection.

 

If you can install a cooling fan for it, this is a very good idea, because we are constantly improving the cooling system of the inverter. Because it needs to be waterproof, it is impossible to install a cooling fan, and it can only rely on the heat dissipation of the body. Features.

 

We are constantly improving. If you have good suggestions, you can tell me that we will accept it. Thank you.

 

Best regards

Anson Guo

 

I hooked up a 100mm 12V fan as a test measure and it reduced the maximum temperature to below 60C. I'll do the job properly at the weekend.

 

I've also got some aluminium heatsink extrusions on order to test as additional passive cooling.

 

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I guess the inverters must be using the outer case to dissipate heat from the internal components. I think the temperatures mentioned are a bit high for what is supposed to be functional in an ambient of 40 or so. Also the support guy says that the cut out temperature is 70 but didn't you say earlier that the inverter was cutting out at 60? At those sort of temperatures you need to be wary of what you touch. The comments about "waterproof enclosure" make sense so with this in mind, the manufacturer should have increased the surface area of the enclosure for operation in ambient above (say) 25C by fitting heat sink cooling fins. An external fan would be a bit risky if the units are mounted in the open. 

Another thought occurs to me with regards to protection from the elements. You aught to consider installing a surge arrestor because a local indirect lightning strike can generate a big EMP which will destroy your hard work and hard earned expenditure on the project. They are available from Lazada and are not expensive. https://www.lazada.co.th/-i2047347-s2372828.html?urlFlag=true&mp=1 It was only a year ago that I had this unfortunate experience which destroyed two out of three hybrid inverter/charge controllers. These had internal line protection which simply wasn't up to the job. 

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Surge suppression already installed 🙂

 

The shutdowns are odd as I've had both inverters at 65C without them cutting out and when they do shut off the status still reports "normal", other times they've gone off at 59C. But since bodging on the fans (OK only 1 day) they didn't shut down once.

 

The "back" of the unit (opposite the indicator light) seems to be the main heatsink area so I'm going to bang a chunk of heatsink extrusion on that side using self-adhesive heat-conducting tape.

 

To be honest, if it works with a couple of cheap 12V fans and a solar panel to drive them then the job's a good un.

 

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56 minutes ago, Crossy said:

From Kaideng support regarding inverter temperature.

 

 

I hooked up a 100mm 12V fan as a test measure and it reduced the maximum temperature to below 60C. I'll do the job properly at the weekend.

 

I've also got some aluminium heatsink extrusions on order to test as additional passive cooling.

 

The extra heatsinks will certainly help. I have a Mac Mini server that likes to run hot but with this (center punch for scale) the fan seldom spins up more than a silent 1800 rpm with the CPUs at 62~68C (maximum temperature for them is 105C and max fan speed is 5,500 rpmIMG_8295.thumb.JPG.fb2818a600d0add909bbbbcd5c48eb12.JPG

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11 minutes ago, Muhendis said:

the manufacturer should have increased the surface area of the enclosure for operation in ambient above (say) 25C by fitting heat sink cooling fins.

they are on the two narrow sides, if you go back to the pictures.

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27 minutes ago, Crossy said:

The "back" of the unit (opposite the indicator light) seems to be the main heatsink area so I'm going to bang a chunk of heatsink extrusion on that side using self-adhesive heat-conducting tape.

Thermal tape isn't very effective.

You should use CPU thermal paste.

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Just now, BritManToo said:

Thermal tape isn't very effective.

You should use CPU thermal paste.

 

I know, but there's no real way to attach anything without taking the beast apart which I want to avoid at present (warranty and all that jazz).

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10 minutes ago, Crossy said:

I know, but there's no real way to attach anything without taking the beast apart which I want to avoid at present (warranty and all that jazz).

My 600W Suoer unit has much more heatsink on all four sides and twin internal fans, the fans start coming on when it's producing over 200W. When I first saw the WTC design, I did wonder how it could dissipate heat so much more efficiently than mine and without any fans.

 

Clearly the answer is, yours just stops working when it gets hot.

Edited by BritManToo
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