Yes, you can leave them ON overnight. Make sure that you have enough petrol/large tank to run them....
Bro, 1HP is 746W. 2.5HP + 1.5HP + 1.5HP = 5.5HP = 750x5.5= 4125W
When a compressor starts, its drain on current is approx 3X so, 4125W x 3 = 12375W or 12375VA. Normally, factor of safety is X2. However, it is your call. My take is 25KVA.... (Have no real experience here, though)....
3303:shocked:





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