Add up what you are actually running, then compare it to what your shore power service can deliver. Voltage matters: a sagging pedestal delivers fewer watts at the same amperage.
Measure it. Campground pedestals commonly sag to 108–114 V under load. Valid range 90–135 V.
50-amp service is two independent 120 V legs. Assign each appliance to the leg its breaker sits on: the leg that fills first is the one that trips, no matter how much room the other leg has. Check your panel to confirm which circuits land on which leg.
Add your loads
Enter appliance wattage.
Assumptions and limits
- 30-amp service is a single 120 V leg: 30 A × measured volts.
- 50-amp service is two independent 120 V legs at 50 A each. The result is governed by the worst-loaded leg, not the combined total, because each leg has its own breaker. Leg assignment here is what you tell it; verify against your distribution panel.
- Running watts only. Air conditioner and compressor startup surge is not included and can be several times running draw.
- Continuous load above 80% of service capacity is where sag and nuisance trips appear.
- Appliance nameplate wattage is a maximum, not a constant draw.
This is a planning estimate, not an engineering specification. Confirm every figure against the manual for your exact equipment. Wire gauge, fuse sizing, and breaker sizing are safety items. If you are not certain, have a qualified RV technician or electrician verify the install.