Hi Chocohead,
On my 1.12.2 client I am running Advanced Solar Panels-4.2.0, and the Advanced Solar Helmet appears as just a black box.
This happens with any valid version of IC2, on both forge 14.23.4.2703 and 14.23.4.2759, regardless of what other mods are installed (including no mods except ic2). No issues with the other two solar helmets though. If a fix for this could be included in a patch that would be great!
Here are some screenshots: