Safety Integrity Level (SIL) for Commercial Size Power Systems


I 've been in the Battery Energy Storage System (BESS) industry for the last 4 years. Before, that I was in manufacturing. One of the things I've noticed is that the EStop (or EPO) in these BESS units is not as critical as in manufacturing systems. I'm guessing it has to do with the fact that Energy Storage Systems (ESS) are unmaned by the most part. However, I'd like to know if there is an official Safety Integrity Level (SIL) that we have to meet for ESS or similar systems?

Thank you!