150 amps sounds like way more than enough. I have 50 amps for the following -

400K Btu Heater
(2) 2 hp pumps
(2) pool lights
(1) booster pump
(2) outlet plugs - which I run two bug zappers and a sump pump (sometimes)

I have been using this 50 amp service also to build a shed around my pool equipment. So I am frequently running all the above plus a 20 gallon air compressor and chop saw. Have never had any problems.

John