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With the rapid deployment of renewable energy, the power grid in many areas can no longer take more on-grid solar systems. For instance, Hawaii ended the solar net-metering program in 2015. In April 2016, ISO (Independent System Operator) in California forced temporary shutdown of large solar farms to avoid grid instability. For this reason, off-grid solar heating and cooling has a great potential in the U.S. and European market.
The following graphic shows a 4-channel 1.25KW Dual-Output Off-Grid CyboInverter that has two AC output ports to power different types of loads. Each inverter has four input channels that can connect to four solar panels or batteries and produce 1250W AC peak power. The product is patented, UL1741 certified, NEMA 6 rated, and made in the USA.
The following diagram illustrates an off-grid solar power system for heating and cooling with two dual-output off-grid solar power inverters, where a master unit is daisy-chained with a slave unit to form a 2.5KW system. Four 300W solar panels connect to four input channels of the 2 inverters respectively. One 48V battery connects to the remaining 4 input channels in parallel to provide night-time power and surge power to start the compressor of an air conditioner or refrigerator. In off-grid mode 1 (left side), the system can harvest solar energy from the solar panels and send power to a single- or dual-element electric water heater or area heater. In off-grid mode 2 (right side), the system can run lights, fans, computers, phone chargers, and a refrigerator. After the A/C and/or refrigerator is started, the required AC power will drop significantly. If the solar provides sufficient power to allow the inverters to run the A/C and/or refrigerator, the inverters will not pull power from the battery. This ensures a longer battery life.
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