You're welcome, and thanks for the comments.
I have an electronics background, so I guess that's why I like getting into performance and optimization. I suspect that you also have a technical background as well, am I right?
I measure everything I can measure, and I even use a data logger for timed samples. I'll change some parameter, like the size of the load, and then repeat the test. A test may run for a week, allowing me to consider how varying weather conditions affect the results.
Be careful Michael, or you'll get addicted like me! haha
sj

