Your 1800 watt [15 amps] will be fine...
Just make sure the circuit that you plug into is dedicated....
YOU WANT NO OTHER LOAD on this circuit you plan on using...
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Turn the breaker 'on' that turns just where your new surge protector will be plugged into...and now turn [all other breakers] everything else off....
Walk around and plug a light into every outlet in your whole place, all other outlets...
If you find another outlet that stays on with new grow, tape over it so you will not use by accident....
You don't want your wife/GF/sister/mom, plugging a hair dryer [900-1200 watts!] into your dedicated grow room....
Once you have found all the outlets on the breaker for your room, and unused them, you will be that much more safe....
Good Luck!