RSD Between Tigo and Sol-Ark 15k

Hello,

I've been searching for the "best" way to enable RSD with the Tigo Optimizers and EPO with the Sol-Ark 15k. From what I've seen, the best method seems to be using pins 15 & 16 on the Sol Ark to drive a relay at the Tigo CCA. After that, there have been two methods.

1. Relay NC connection connected to the Aux Port on the CCA - When the inverter EPO is hit, power shuts off to the 15 & 16 pins, causing the relay to go from open to closed, and effectively "pressing the RSD button" on the Tigo CCA.
2. Relay NO connection interrupting the 24v power to the CCA. When the power shuts off, the tap stops sending a signal and the modules go into RSD.

I've read that when the EPO button is pressed on the Sol-Ark, the electricity from the grid can pass through to the load. That would allow the CCA to stay operational if that button is pressed. Seems like the relay option is the safest bet but which option is best?

Thanks!

I just have my CCA powered off a breaker in the "Load" panel, going to a step down converter to the CCA.

Therefore if the inverter shuts down, so does the CCA, therefore triggering the PV to turn off.

Simple.

With the 15k, if you press the Emergency Stop button, you lose all power to the load panel?

TechRider said:

With the 15k, if you press the Emergency Stop button, you lose all power to the load panel?

Click to expand...

I do not have an emergency stop button. I only have the on/off button on the front of the inverter, and the PV disconnect switch on the left side.

Approved in California in 2022.

TechRider said:

1. Relay NC connection connected to the Aux Port on the CCA - When the inverter EPO is hit, power shuts off to the 15 & 16 pins, causing the relay to go from open to closed, and effectively "pressing the RSD button" on the Tigo CCA.

Click to expand...

That's how I have mine wired with this relay. Just out of principle I'd rather use the shutdown signaling circuit rather than just killing power to the CCA.

My installer arrived with a N/C RSD switch. So, I supplied a SSR and did this. Yes, I know it doesn't do emergency shut down of the inverter, but it passed inspection.

My RSD switch is wired to the pins on the Sol-Ark 15K. The Tigo is powered from a breaker in my main panel. When the RSD switch is activated, it shuts down the Sol-Ark and thus my main panel. I tested it before my inspection. I also have a 200A disconnect after my meter, so if I have bypassed my Sol-Ark for some reason and you throw the disconnect, it also kills power to the main panel, thus the Tigo, thus killing the panels.