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Latest regulations/ legislation for PV combiner box?


Slaaiblaar
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1)I would also like to know the proper placement and quantity of the fuse as normally you would place a fuse at the power source, so to me the best place is at the panels so that if a short occurs on the cable the fuse has a chance to blow and protect the cable from burning.

2) you would need to look at the voltage that your panels would produce in winter and the max voltage of your mppt. The surge protection should be between those two ratings but closer to the mppt max voltage should be best.

3) double pole isolater is a must

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This is what I do,  have done the PV Green Card Installation Course. This is what is recommended. A fuse on the Positive and Negative legs, a surge protector and a Double Pole Isolator switch. See drawings below. No fuses on the roof, only connectors where you can disconnect if needed. If you disconnect make sure the fuse on bottom panel are disconnected as it can cause big spark. Earth the Solar panel structure and connect to a separate earth Pin, 1.5mters so that lighting would be taken direct to ground and not to Electrical Earth.

I ordered all component's from Solar Europe in Pretoria. Solar Europe - Solar Energy Brands Importer and Distributor (solar-europe.co.za)

 

07 Panel PV Isolation Layout.pdf 08 Panel PV Isolation Layout.pdf

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9 hours ago, Tariq said:

the Sunsynk inverter has a built in idolater for the two mppt's, will that suffice or do you need another one in the combiner box

Hi Tariq. 
 

I use the fuses that also doubles up as an isolator. You will need some sort of isolator in a combiner box. 

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9 minutes ago, gooseberry said:

but that is what specialised DC breakers are made for... like the Noark ones. Of course you avoid it if you can.

Yes it is however it’s poor practice to disconnect PV under load. You can cause permanent damage to some inverters. 
 

The hazard and warning labels we stick specifically state, DO NOT DISCONNECT UNDER LOAD. 

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13 hours ago, Leshen said:

Hi Tariq. 
 

I use the fuses that also doubles up as an isolator. You will need some sort of isolator in a combiner box. 

@Leshen, yes, I do use the same quick disconnect fuses in the combiner box, also, if i have to do any panel wiring work, i first switch off the isolator on the Sunsynk and then disconnect the fuses. However my question was, is an isolator  needed in the combiner box as per regulations

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1 hour ago, Tariq said:

@Leshen, yes, I do use the same quick disconnect fuses in the combiner box, also, if i have to do any panel wiring work, i first switch off the isolator on the Sunsynk and then disconnect the fuses. However my question was, is an isolator  needed in the combiner box as per regulations

Hi Tariq. 
 

Are these COCT regs? 

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17 minutes ago, Leshen said:

There is no legislated SANS regs on Solar PV installations. 

This is interesting as CoCT require a "DC COC" which I assume to cover PV and battery wiring.  Any ideas on what this COC should cover then if there are no regs?

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18 minutes ago, shovelhead said:

This is interesting as CoCT require a "DC COC" which I assume to cover PV and battery wiring.  Any ideas on what this COC should cover then if there are no regs?

That’s the reason I asked if it’s a COCT regulation. Currently SANS 10142 doesn’t cover Solar. If someone can show me the SANS regs which covers Solar then I stand corrected. 

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when submitting your application to CoCT, you have to include a diagram of the solar installation which includes the integration with the main db and grid, the coc that i sent in did not have too much detail on the solar installation.

Below  is what I received from a forum member

 

 

PV-System-Interim-Guidelines-Good-Practice-for-Solar-PV-Installations-South-Africa- (002).pdf

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12 minutes ago, Tariq said:

when submitting your application to CoCT, you have to include a diagram of the solar installation which includes the integration with the main db and grid, the coc that i sent in did not have too much detail on the solar installation.

Below  is what I received from a forum member

 

 

PV-System-Interim-Guidelines-Good-Practice-for-Solar-PV-Installations-South-Africa- (002).pdf 1.07 MB · 2 downloads

@Tariq  could you please share the detail of the solar installation coc that was included?  I am currently stuck at this point as my installation was done in 2015 prior to all these requirements.

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