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Posted

Hello all,

I'm seeking some advice regarding my inverter wiring that was done by a not so clued up electrician. After doing some research about my specific inverter and requirements I have I had to give advice to the electrician on how to wire to the DB. I've got my essentials and non essentials split on the DB and the inverter connected to the essentials to provide backup power during the load shedding.

My backup system consists of the RCT VM3 and 4 102AH Leisure batteries. 

Everything seems to be working 100% except that during load shedding my lights glow slightly when they are switched off. Could this be that the earth leakages are installed incorrectly, the neutral and earth bonding is incorrect or is this normal?

Some advice would be greatly appreciated.

Thanks!

 

Posted
4 hours ago, BananaFace said:

4 102AH Leisure batteries. 

Ah. That doesn't sound so good. Perhaps others with more lead acid experience can comment.

I would think you'd want genuine deep cycle "solar quality"  battery modules for an inverter. Especially if it's a 5 kW model (you didn't say).

4 hours ago, BananaFace said:

Everything seems to be working 100% except that during load shedding my lights glow slightly when they are switched off.

I'm pretty sure that's normal; modern LED lights can emit a faint glow from the smell of a slightly charged wet rag.

Posted
13 hours ago, Coulomb said:

Ah. That doesn't sound so good. Perhaps others with more lead acid experience can comment.

I would think you'd want genuine deep cycle "solar quality"  battery modules for an inverter. Especially if it's a 5 kW model (you didn't say).

I am unable to find a spec sheet of the batteries online however, they are definitely deep cycle batteries and are used in many solar applications. Apologies, I have a 3kw inverter installed with model number Rct Axpert Vm3 3Kva.

13 hours ago, Coulomb said:

I'm pretty sure that's normal; modern LED lights can emit a faint glow from the smell of a slightly charged wet rag.

If this is normal, should the same thing happen when electricity is not supplied by the inverter? 

Thanks for your reply.

Posted
4 hours ago, BananaFace said:

they are definitely deep cycle batteries

Oh sorry. I thought that the word "leisure" implied "not deep cycle", use for boating and the like. But I suppose it also implies camping, which would be deep cycle. My bad.

4 hours ago, BananaFace said:

If this is normal, should the same thing happen when electricity is not supplied by the inverter? 

Yes, I would expect so. Perhaps there are high frequency components in the output waveform that aren't completely filtered out, and these radiate over house wiring much better than smooth 50 Hz from the utility.

Posted
On 2022/04/20 at 1:37 PM, BananaFace said:

Everything seems to be working 100% except that during load shedding my lights glow slightly when they are switched off. Could this be that the earth leakages are installed incorrectly, the neutral and earth bonding is incorrect or is this normal?

I suspect you are on the right trail. Earth bonding during battery operation must be checked. Measure the neutral voltage to earth during such operation. It should not be more than a fraction of volt.

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