Solar panel identification

Sounds like a 100 watt rated panel at that size with an open circuit of 16 volts DC. As long as panels are fairly close matched to size, you can just wire them in parallel. Most panels have diodes in them to keep a shaded panel from pulling down the other. Most likely your controller also recognizes the benefit of isolating each panel and provides two inputs.

Search Amazon for your Solar Regulator. There are several kits. If your install is a kit, you can probably ascertain the solar output of your panels by physical size.