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Hi guys, just a newbie here so please bare with me. My 48V phoenix inverter is 1200VA model. I am running plain old 1kw AC water heater on inverter. Input side measures DC power: 21.5A* 54V = 1161W. That's like 86% efficiency. Inverter fan is running. Does inverter efficiency normally drops so low when it is working at full power?
I'd say yes. There is document describing power loss and efficiency as a function of load.
In the document, which you can read here, the example is a MultiPlus 24/3000, which at an output power of 3000W has an efficiency of 86.5%. That's what you seeing on your inverter.
