Apologies to the OP for the thread drift here. Sounds like you have a good plan, and 400 - 500W of solar and PWM controller will work well for you.
However, one of the issues with a forum is that it can act as an echo chamber and incorrect information gets repeated and amplified unless it is corrected. There are a bunch of statements in this thread that really aren't correct, and while these don't matter in your situation, it may be important for the next guy. Part of the reason that solar and energy management systems seem so confusing and complicates is that there is so much dodgy information floating around.