Steve,
I notice you've gone off the grid and it appears you're using a generator to supply power as required [for battery charging etc]. If you can possibly manage it, solar power is brilliant and far more convenient. A basic system using a couple of 80W panels, a regulator and a small battery bank would probably suit all your needs at the present and reduce the need to have the noise of that generator shattering the peace of your environment. If you're using 12V batteries for your audio a regulator can be permanently connected and still allow you to use your gear at the same time.
One of the other great things about solar systems is that it's easy to expand their size simply by adding a few panels as needed. The battery bank can be expensive but in most parts of the world battery banks are used as back-up power supplies for critical business applications and are replaced at fixed intervals with many years of life still in them. For example, I'm using a bank of 12, 2V, 560 Amp hour ex Telstra batteries. These things weigh nearly a ton all up and are 20 years old. I've had them for the last five years and from their performance, I reckon they'll do another 5 years.
Anyway, this is all somewhat OT but if you're interested please feel free to contact me ... or maybe it's time for another solar power thread?
jules