Hi all, I was reading about an issue one of the outback chargers had with its MPPT implementation and was wondering how much do the MPPT functions of charge controllers differ from grid tie inverters?
Others can answer the MPPT question in detail better than I… Basically, MPPT started out pretty simple… Assume that Vmp was some percentage of Voc–and just use that voltage. Newer units would sweep every 5-15 minutes and find the “current” MPPT Vmp. And the newer ones yet, would optimize some 60-120 per second (like GT inverters)… How that is done–I don’t know. And the details may be a trade secret. New MPPT algorithms capture more energy–but I would be surprised if it was a lot more (probably something like up to 10% better–not 50% better over earlier designs–of course, there are poor MPPT designs that don’t work as well as a simple PWM controller too). The other issue is how to compare efficiency with two very different types of hardware. One is a single conversion from Solar Panel DC (typically 200-600 volts or so) to ~240 VAC and around 95% maximum converter efficiency. Vs a MPPT charge controller “RE System” which must down convert from ~17-140 VDC to 12 VDC (or 24-60 V
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