Unknown sensors(?) and wires for PV connections in newest Sol-Ark 15K

[axum]

I just got a new Sol-Ark 15K from CurrentConnected and in the process of setting it up.

I saw something I haven't seen before in any of the videos or pictures of the Sol-Ark 15K: see the image below, what is this little circuit board (circled in red)? It seems to have 6 sensors with 6 wires going to the PV connections.
Anyone know what this is? It's definitely something new in the latest Sol-Ark 15K inverters.

 

[crossy]

Can you show details of any markings on the little blue chaps?

 

[Quattrohead]

They look like capacitors connected to the PV inputs.

 

[Sergio95050]

Or voltage suppressors

 

[axum]

It's a capacitor...

Seems like a very weird place to put them. I guess they had no room to put them anywhere else.

 

[teal95]

Filters for the arc fault detection?

 

[Devin]

The added connections you see are filters and grounding for the inverter. What you share is the additional filters for the PV input

 

[timselectric]

Maybe it's part of the EMP hardening upgrade option?

 

[TechRider]

The added connections you see are filters and grounding for the inverter. What you share is the additional filters for the PV input

Is that something that existing owners of 15ks can/should look at adding?