Let's see...I live in an old farm house with the same basic set up you mentioned.
Surge Protector 1:
1-150 Watt Heater for my water mixing tub (not always on)
1-Maxijet 1200 for my water mixing tub (not always on)
1-260 Watt PC light fixture (PC Bulbs only and on a timer)
Surge Protector 2:
1-Mag 24 pump (closed loop)
1-Mag 7 pump (sump return)
1-Mag 3 pump (
protein skimmer)
1-300 Watt heater (hardly ever comes on with all these pumps running)
1-Grounding Probe
1-Maxijet 900 that blows across the top of the tank towards the overflow
4 Watt Moonlights for my PC unit...always on.
It works for me, BUT...check out your circuit breaker and see what the load capacity is for that particular circuit.