I am automating a shrub and tree nursery which is off grid. I am using solar panels and cheap inverters from Harbor Freight. I recently had problems with 120vac pumps failing and when I looked at the output of one of the 2000 watt inverters it was totally screwed up with huge voltage surges.
I want to monitor the waveform of the 120vac output by feeding it into a micro A to D and sensing it, and then comparing it to a perfect one and shutting down the inverter if problems are seen.
My problem is getting the voltage into the range of the 5v micro A to D. Dividers put a constant load on the output but are the only thing I can think of so far. I have a Harbor Freight multi-meter that cost $1.98, so I know there must be affordable ways to get the voltage to a usable level and read it accurately, but I need some help in finding them.
Thanks in advance for any suggestions.
I want to monitor the waveform of the 120vac output by feeding it into a micro A to D and sensing it, and then comparing it to a perfect one and shutting down the inverter if problems are seen.
My problem is getting the voltage into the range of the 5v micro A to D. Dividers put a constant load on the output but are the only thing I can think of so far. I have a Harbor Freight multi-meter that cost $1.98, so I know there must be affordable ways to get the voltage to a usable level and read it accurately, but I need some help in finding them.
Thanks in advance for any suggestions.