...a 12vdc power supply. Is this the same as an inverter?
No. Completely opposite.
Generator people are confusing everybody when substituting the term "inverter" for "inverter-charger".
Don Piano is right, you need an easy read on the subject, before starting making fireworks. And maybe do it in baby steps. Install solar first. Then - inverter Morninstar 300.
Another way would be getting
100W solar suitcase that needs no installing, and install Mornigstar 300. Not financially efficient, but easier for beginners.
