I've often wondered if the MPPT controllers on ebay are really PWM. They seem too cheap to be MPPT.
I built an MPPT controller a while back (Jaycar kit from Silicon Chip design I picked up at 75% off) but haven't got around to doing a comparison with the PWM controller on my camping solar panels.
The camping panels I have comprise two that unfold. I'm thinking of connecting the PWM to one half and the MPPT to the other. They will receive the same level of sunlight as they will be side by side and I can can record the voltage and current with a 4 channel digital recorder (I wondered for years about a use for it. )
One day.
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