I think he means volts.
At idle with the electric fan(s) running and the headlights on, I would not be surprised to show the voltage across the system to drop to 12 or lower. The load on the alternator might also pull the engine idle down somewhat. Blip the throttle and it should pick up to 14 volts immediately. You can probably raise your idle speed a little to counter this. Do you know what size alternator you're running? Possibly one with a little more amperage output could improve this considerably.
Another possibility would be to wire an idle speed solenoid in on the carb to raise the idle when the fan kicks on - but typically these solenoids are not powerful enough to push the throttle open without a blip of the throttle first. So, it may not be worth the effort.