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Mercer Axpert MKS II & Grounding Box


Bulletjie

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HI all

I am new and not an electrician but have a decent understanding of what people are talking about.

Axpert MKS II, 20 x Vision HF12-560W 120Ah beteries.

I have a Mercer Axpert MKS II that I am temporarily connecting for load shedding as a big UPS until fund are available to connect the hole house. There are so many threads on Neutral - Ground connection after the inverter and it is hard to decide what the most accepted method is. I got a Grounding box with the inverter that makes it easier to decide how to conect it. However I have not seen a single picture or heard of anyone using a Grounding box with the MKS II inverter.

  1. Is there someone who are using the grounding box with there inverter?
  2. Is this the best (correct) way to go?

Thank you in advance

Gerhard

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On 2020/02/13 at 6:30 PM, Bulletjie said:

I got a Grounding box with the inverter that makes it easier to decide how to connect it.

I don't believe that you can successfully use the grounding box if your firmware doesn't have setting 38, designated "NEC" (Neutral Earth Connection). My feeling is that only the Axpert MKS I models have this setting (and only starting a few years ago).

[ Edit: added "I" after "MKS" ]

Edited by Coulomb
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5 hours ago, Coulomb said:

I don't believe that you can successfully use the grounding box if your firmware doesn't have setting 38, designated "NEC" (Neutral Earth Connection). My feeling is that only the Axpert MKS models have this setting (and only starting a few years ago).

Thank you for the reply Coulomb. It is an Axpert MKS II and does have setting 38. It is just strange to me that no one else is using it and this is making me wonder why not. Certainly can not be that everybody have older inverters.

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On 2020/02/13 at 10:30 AM, Bulletjie said:

Is this the best (correct) way to go?

If you connect it to the distribution board, then SANS requires that it creates an NPE bond while running islanded. When you use it as a standalone UPS it doesn't matter. This requirement is however in chapter 6 which deals with embedded generation (aka PV modules connected). So I simply have no idea what is required for a UPS, but I suspect the same still applies.

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On 2020/02/15 at 10:19 AM, plonkster said:

If you connect it to the distribution board, then SANS requires that it creates an NPE bond while running islanded. When you use it as a standalone UPS it doesn't matter. This requirement is however in chapter 6 which deals with embedded generation (aka PV modules connected). So I simply have no idea what is required for a UPS, but I suspect the same still applies.

Thank you for the reply Plonkster. I think I will put the Grounding box in as a temp solution until I have the funds to get an certified person to connect the DB for me.

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