my power supply for my shed is 63amp, our 3 phase is 400v here.
at the moment the worse case loading for the workshop is:
25hp sander, it draws 34.4 amp on full load, this is stated on the machine plate, sander is on VSD, the sander will not draw more than 34amp.
10hp compressor, it draws 13.8 amp (plate value)
5.5hp extractor, it draws 7 amp (plate value)
that is 55amp all up.
my extractor is a bit undersized. I would like to upgrade to a 10hp extractor, that means the amp draw will be around 14amp. this will bring the total amp draw to 62amp. just under the the supply of 63amp.
I know the sander only draws 34amp when its a wide panel or when I try to sand too much in one hit.
The question is:
Would I be alright to upgrade the extractor to a 10hp unit and rely on the mains power? this means I will have to start my machine in various sequence and be real careful about the sanding and possibly have to put VSD on the compressor or/and the extractor.
OR
buy a generator and put the extractor or the compressor on the generator. this is less desirable because I really dont want to spend anymore than I have to.
one of the option I have been told is to change the motor on the compressor so it runs on gas, I am reluctant to do this because I just bought the compressor new in 2014 and its in a quiet capsule. modifying it will cost too much.