mppt vs pwm
Hi, A nice little video comparing mppt vs pwm with the batteries in bulk mode. mppt vs pwm
Forum Discussion
You take a fairly large hit when going series. Look at the Rogue 3048 efficiency graph on pg. 43.
At 10A:
the 85V system is 93% efficient
the 51V system is 95% efficient
the 17V system is 97% efficient
That a loss of 0.4A when operating at 85V. 4% loss is significant. When on average, mppt is only 5% better than pwm, you're losing your advantage. I don't see it as a big deal to increase wire size for the 17V system to keep losses at 1%. RV cable runs are so short the cost is insignificant.
At 10A:
the 85V system is 93% efficient
the 51V system is 95% efficient
the 17V system is 97% efficient
That a loss of 0.4A when operating at 85V. 4% loss is significant. When on average, mppt is only 5% better than pwm, you're losing your advantage. I don't see it as a big deal to increase wire size for the 17V system to keep losses at 1%. RV cable runs are so short the cost is insignificant.
12thgenusa wrote:
I don't know about other controllers, but Rogue's published efficiency curves show that at a 20 amp output, 17-volt panels to a 12-volt system are about .2% more efficient than 34-volt panels, both right at 96%.
