690.7 (C)

[jaggedben]

The bleed down kit is a resistor that bypasses the DC disco. It allows the voltage that is trapped between the switch and the optimizers to equalize in under the ten seconds dictated by the NEC. My understanding is that the residual voltage is on capacitance in the optimizers and the inverter, and opening the DC disco takes the capacitance in the inverter out of the circuit.

I'm by no means sure of this, but my understanding is that the bleed down is for the capacitance of the inverter, not the optimizers. I'm more sure of this: if the DC switch is opened it will bleed down the inverters and not the optimizers, because it's installed on the inverter side of the switch.

 

[jaggedben]

It helps but according to the tests that our AHJ ran it doesn't get you all the way down in the ten seconds allotted.

If true that's disappointing. I thought that was the whole point.

 

[ggunn]

I'm by no means sure of this, but my understanding is that the bleed down is for the capacitance of the inverter, not the optimizers. I'm more sure of this: if the DC switch is opened it will bleed down the inverters and not the optimizers, because it's installed on the inverter side of the switch.

See http://www.solaredge.com/files/pdfs..._single_phase_inverter_installation_guide.pdf

The rapid shutdown kit is installed on the optimizer side of the switch.

 

[jaggedben]

See http://www.solaredge.com/files/pdfs..._single_phase_inverter_installation_guide.pdf

The rapid shutdown kit is installed on the optimizer side of the switch.

You're right, I was mistaken.

 

[ggunn]

You're right, I was mistaken.

Even I was mistaken one time.

 

[GoldDigger]

Even I was mistaken one time.

I thought I had made a mistake once, but I was wrong.

 

[SolarPro]

You're right, I was mistaken.

Even a broken clock is right twice a day. [Analog joke for those whose clocks still have hour and minute hands.]