Originally Posted by ChileRick
Planning our summer trips and are running into a problem with some RV parks on our route that only have 30 amp service. We have a 50 amp MH. Since we travel with a dog, we need to keep utilities on. Do we have to pass on these CGs? Is there a way to manage with just 30 amps?
Energy management is a wattage calculation. Ohm's law states Watts = Volts x Amps. Power (consumption) is measured in watts.
A 30A service is at 120V and provides 3600 watts of power.
A 50A service is at 240V and provides 12,000 watts of power. Almost 4X more than a 30A service.
Next calculation to make is how much power (watts) is drawn by each device.
Each a/c unit (or each compressor on a basement air) will draw approximately 1450 watts. So 2 a/c units running will consume 2900 watts of power. You're getting close to the 3600 watts available on a 30A service, but have LOTS of headroom on a 50A service.
To keep both a/c's running, power down most everything else. As others have stated, run the refrigerator on LP, hot water heater on LP. Start with fully charged batteries so the charger/converter doesn't consume a lot of power.
A microwave or a hair dryer will pull upwards of 1500 watts. So if both a/c's are running on a 30A service, you just ran out of power when you try to run 3 devices.
Most motorhomes have an energy management power system which will preclude a breaker from being tripped when too much power is drawn, by shutting down devices in a pre-determined priority order.
Moral of story is, yes
, you can run 2 a/c units on a 30A service if you wisely manage other power draws by running the 'fridge and hot water heater on LP, not electric, make sure your batteries are already charged before you need the 'big draw', and shut off all other electrical power needs.
'07 Winnebago Journey 34H - CAT C7, Koni's, MCU's, SS Bell Crank, Safe-T-Plus
'07 HHR Toad, SMI AFO, Blue OX