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Brand new multiplus 12 1600 70. Running airconditioner new sparrow aircomader Mark 4 with Max watt of 950. When the airconditioner compressor cut in it draws about 70 amps inverter has a loud short low pitch buzz for about 1/8 of a second every time.
You are running an AC from your multi, and it works?
That sounds like an overload from the AC in-rush current when its compressor first kicks in.
The AC may be a 950W unit, but on start-up it will draw considerbly more than the 1300W the 12/1600 Multiplus is rated at. As long as the in-rush is short duration (under 30 seconds and yours is under a second) and under 3000W (for the 12/1600), it should be fine, but get used to the buzz.
I had that on a 12/500 inverter and 12/800 MP when running a 230V fridge (pulling 37W running but 800W inrush)
Also occasionally get an overload note with the 12/1600 MP when the 230V fridge starts if I have the 800W Water Boiler on (but not noticed the buzz with this one - maybe too insulated from it to hear?)
