Originally Posted by jgerhard
Curious why you chose a pulse width modulated (PWM) controller?
I know this was directed at Jmooney but I also chose to go with PWM over MPPT. The biggest reason is cost. A good MPPT controller is way more expensive than a good PWM controller. You can get high voltage panels cheaper than the "12volt" panels but I would need a 700Watt system to break even with the cost of the MPPT controller.
The second reason is I don't believe you get the benefits that MPPT claim. Yes you do get more "power" from them but I think it is marginal (5-10%) and only in ideal conditions. I would rather add an extra panel and get more power all the time rather than an MPPT controller and only get a little boost when conditions are right. And adding an extra panel is still cheaper.
When MPPT makes sense......
- You want or have high voltage panels.
- You have a prewired trailer or MH that uses small gauge wire
- You are building a large 600+ watt system
- You have long wire runs and want to run high voltage to reduce losses
Hope that helps.