It's probably best if you just search for "solar inverter" or other processes in our databases yourself: https://nexus.openlca.org/search/query=solar%20inverter. The right choice always depends on a lot of criteria and the specific goal and scope of your study. Therefore, it is difficult to make a pertinent recommendation. You can filter the results on https://nexus.openLCA.org by database (and other criteria).
Unfortunately, paid databases are usually more comprehensive and often of better quality (consistency, documentation, etc.).
I hope this helps.