Very instructive, thanks!!

@chriskitcher

9 ай бұрын

Glad it was helpful!

Thank you Sir!

The reason we have DC isolators adjacent to the Inverter is so if the Inverter needs to be serviced off site, we can isolate the 'Tails' that go to the Inverter, instead of leaving the Live MC4 end waving in the breeze. But some Inverters have an integrated Isolator that you can unclip from the Main Inverter, so will negate the need for a seperate DC isolator

@chriskitcher

2 ай бұрын

I think you will find that unplugged MC4 connectors meet all IP requirements and would not present a problem if identified and tucked away safely while any servicing carried out. My view is that providing the inverter has its own integral DC isolator the addition of an additional isolator is of no value and adds an additional possible point of fault. It’s a matter of choice I guess.

Hi Chris got a diagram of the connections for your DC test box?

@chriskitcher

3 ай бұрын

I will draw one and put it on my channel for you. Give me a few days

@davethomas479

3 ай бұрын

Thank you Chris

thanks

Hi Chris, what was the lead you used from the bottom of the isolator to the Megger tester?

Hey Chris, great vid. If you don't mind sir, please clear up the following: 1) I assume this is an ungrounded array, meaning neither + or - from the array is solidly or functionally grounded, correct? 2) I understand when you short the array, there is 0 volts at Isc but the array Isc current (I think you said 14A) is still flowing in both cables and now you are back-feeding 500V from the megger to produce a 2nd possibly high leakage current to ground to measure insulation resistance (megger doing ohms law). I understand the megger current is normally very low with good wires but is there an issue with the megger accuracy when both current sources are flowing on the shorted cables at once?

@chriskitcher

17 күн бұрын

Hi Jon, Because this is a pv panel once the ends are joined the current will not flow anywhere other than within the panel. (Its a bit like shorting the ends of a current transformer for safety). It will have no effect on the accuracy of the insulation resistance reading. I hope this answers your question. Best regards Chris

Hi Chris, thanks for your videos, Any idea when the DC Test Device build video will be available?

@chriskitcher

5 ай бұрын

I will try and get it done over next few days

Great idea with the isolator; I'm going to make one. I assume that, since this is a 2-pole isolator, it connects diagonally. So, terminal 1 connects to 4, and 3 connects to 2. Then make a link between 2 and 4 with a second cable in terminal 4 with a female MC4 connector on it, correct?

@chriskitcher

7 ай бұрын

It doesn’t matter which way you connect just link bottom terminals

Sir, when you connect the positive and the Negative ends of your solar PV string into the isolator, you basically shorted them? Will that be ok? No damage to the panels. Pardon my being a newbie. 😅

@chriskitcher

8 ай бұрын

No damage will occur, joining them together is the correct way to carry out a short circuit test. Always ask if you are unsure.