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NRS097 compliant system


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I only recently found out about NRS097 which is apparently the standard detailing solar spesifications etc. I recently bought an 'advanced energy robotolics' 5KW inverter and 1 lithium battery (3kwp) with 12 360w solar panals. Apparently the voltage coming from eskom is too high (242 instead of 230) and therefore the inverter trips when the powers turns back on after loadshedding. I was told that the system is not NRS097 compliant by a different company who I consulted. How do I know if this is true and if so, would I be in a position legally to claim a refund from the supplier? Any help appreciated.

 

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11 hours ago, Marius007 said:

Apparently the voltage coming from eskom is too high (242 instead of 230) and therefore the inverter trips when the powers turns back on after loadshedding

The 242V these days from the municipalities are very common and I find voltages in Johannesburg sometimes go as high as 255V, the inverter should not trip at 242V unless it has a setting where the voltage was limited to be below that setting. Check the “AC input range” and set it accordingly. Mine is set at 80VAC to 280VAC which allows for big variances. 

 

12 hours ago, Marius007 said:

the inverter trips when the powers turns back on after loadshedding.

The inverter should not trip when Eskom comes back on. That sound like something is not connected correctly. Is the inverter tripping or the earth leakage?

 

12 hours ago, Marius007 said:

I was told that the system is not NRS097 compliant by a different company who I consulted.

There is a list with approved NRS097 inverters that apply if you are installing a grid tied system. You can still use your inverter for off-grid use. Off-grid installation needs to be installed with a change-over switch preventing any feed back to the grid. The suppliers normally just sell the inverters and don’t care if it is NRS097 compliant or not. The problem is you already opened and connected the inverter and claiming now might not be so easy as the supplier will have all terms and conditions covering himself.   Many people including myself have non NRS097 inverters but fortunately it can still be used.

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I also experienced tripping before. There was quite a few threads before on this forum of earth leakages tripping when switching back to grid and it is caused by transient currents it is quite a common problem and it is normally solved by installing a better quality earth leakage that can manage these transients better. Earth leakage like Merlin Gerlin or ABB normally solves this problem but they are pricey. I had to remove my Onesto brand and replace it with M&G and the problem was solved.

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On 2021/03/07 at 7:15 AM, Marius007 said:

What could be the problem if the inverter is tripping? 

Inverters can trip for lots of reasons and the error code that is normally displayed on the inverter is the nearest answer one can get to this question.

Two main causes is overloading the inverter or a low battery that could cause it to trip. But there could also be a problem on the wiring that cause a short circuit or open circuit. 

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