"two 6ft diameter 400W jokes
That's both more and bigger than I can install or use. :oops:
400W, or 100W, is only a joke when someone expects to go off-grid... And heat their house with the surplus power.
uController looks neat. (and if you are affiliated with them, or very intimately familiar with their use, shoot me an email- I may know someone looking for that type of thing)
But it seems like overkill unless it has temp comp or 3 stages or something?
Have you seen the O-scope pics of my controller?
The HZ were sped up for a specific commercial application (which removes the battery from a small motor vehicle and substitutes a cap- the charging system is a reactance current limited dynamo-type charger), but the switching slopes should be about the same.
Instead of a fixed frequency PWM, I think of it as a PWM with modulating frequency.
With some tweaks (involving un-doing what I did to intentionally slow it down) the standard ghurd controller can go past 1 or 2 MHz, though I do not believe it is a good idea in a battery based system.
The O-scope battery voltage (which was actually a cap) will be tighter in a more normal battery based system, if that's how it is assembled. http://photobucket.com/GhurdControllerScope
Not sure I agree with inexpensive (raw) IGBTs being a good idea in the hands of 99.99% of the DIY people. I just think there are too many complicated 'gotcha' scenarios, like latched, not firing on, etc.
And their Vf in a 12V system has its own issues.
Just my 2 cents, which I am willing to refund on request. ;)