Cheap China Solar Controller Failure
For a couple days been noticing higher than the 14.6 voltage,.....going to 15, and even 15.5,....I knew something was not right. The next day it was showing 16, then quickly went to 17+.......I quickl...
Forum Discussion
KJINTF wrote:12v nominal can be 11 to 15 volts. With constant wattage from MPPT the amps will change with voltage.
Sorry I'm still confused as to what exactly the the quoted statement means
Each of us experience things a bit differently
Watts (DC) to me is very simple Volts x Current
A 500 watt PV array with the correct temps & lighting should come very close (efficiency is expected to be in the high/very high 90%, if not something is wrong)to supplying 35+ amps(to a 12Vdc nominal load requiring such current) if not then again something is wrong with the installation. I don't really care if it's a PWM or MPPT controller.
Not sure how we got onto PWM Vs MPPT
There are many flavors of each variety some good some NOT so good
Your example 500 watts 90% efficient gives 450 watts to the battery or 31 amps at 14.5 volts. Crank on your microwave (inverter powered) and voltage may sag to 11.5 volts and the solar amps will increase to 39 amps. That is the magic of MPPT as it tracks both the panels and the battery.
