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A couple of comments. 1. The reciprocal of the years to payback is called the Return on Investment. As suggested above, with a 7.5 year payback, the ROI is 1/7.5 = 13 %. This is good! 2. With a grid tied system, the inverter has to sync with the grid voltage. When the grid goes down, inverters stop feeding power back. Hence the assertion that "back feeding power to a downed grid might electrocute a lineman" may not be correct.
In retirement I have done some solar trackers. See watt-tracker.com. I would be happy to share the code for an Arduino, which causes the trackers to move.
Today solar panels are selling for as low as 0.47 $/watt. The trendline of the price of panels has been trending downward dramatically in recent years. Grid parity - the idea that it is cheaper to go solar than stay with traditional forms of energy - is occuring in seneral states, and more states to come
You will find my e mail address under the tab Control Package at watt-tracker.com. Bill S
I'm with you 100 %. And am developing a BMS. Thanks for your precautionary advice. I look forward to perfecting a BMS, because now I am using just a very small portion of the Li battery. I want to stay away from the extremes of the S curve.
Great website. I'm doing a project powering a dancing man off of an 8 cell Li battery pack. The cells are 160 a hrs, and I am woindering about some of the settings on the charge controller. Not sure about the Instructables interface.
So the questions are about some voltages, Specifically equalize,boost and float voltages. I know these apply to lead batteries, The charge controller is prompting for these values, I have the overvoltage disconnect set to 27 volts, as I do not want to get into the part of the charge curve where it ramps up steeply at end of charge voltages, I am not using a BMS yet.
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