The most basic example is using them to control the brightness of various LED lighting. High-speed pulse-width-modulation outputs, controllable for frequency and duty cycle, could be used for other schemes. Using solid-state relays, the heavy power users like the water heater could be interrupted for a more immediate but momentary needs like the microwave, and then turned back on afterwards. It would do this by monitoring the current used by every single load, and then comparing the available and requested power thresholds to automatically turn certain loads on or off. The camper PLC-based load management system would need to do the same. Some of these systems can turn loads back on as sufficient power becomes available. Modern backup generator systems installed at some sites use a scheme called “load shedding” to turn off less-essential loads in favor of keeping critical loads online. The original camper concept did not consider a control system, but I knew from 15 years of experience with AutomationDirect’s PLCs and associated products that I could create a reliable way of monitoring and controlling all the loads.
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