Always leave windows and roof vents partially open when leaving a person or pet unattended in the trailer during the summer heat.
Warning
Do not leave a person or pet unattended in the trailer with the windows closed and air conditioning on or an automatic vent open. If the campground loses power to the air conditioner, or if an automatic roof vent senses rain and closes, the trailer can quickly become dangerously hot.
Higher temperatures make it easier to over-charge the battery. If the trailer has a three or four-way converter then it may be possible to tell the converter to use “storage” mode to keep the converter from over-charging the battery. See the converter’s manual for details of how to force “storage” mode. If it is not possible to use “storage” mode, it may be required to turn off the converter during especially hot days.
Simple one-way converters only have one choice of charge voltage, and this voltage may be too high when the outside temperatures are too hot. In this case, it is best to turn off the converter once the battery is charged.
The converter may be turned on again during the cool night hours to top-off the battery again.
If the converter has its own circuit breaker in the electrical panel, this circuit breaker may be used to turn the converter on and off again when camping for a long time in one place. It is best not to use the circuit breaker as a routine on/off switch.
Other options to prevent battery over-charging include disconnecting the battery by hand, or installing a battery disconnect switch. In either case, be sure to reconnect the battery before travel so that it can power the electric brakes in the event that the trailer disconnects from the hitch.
Finally, the entire trailer can be disconnected from the campground power pole during the heat of the day, which also means the loss of air conditioning and other 120 VAC appliances.
Too many campers with air conditioning units can pull down the ac voltage across the entire campground. Low voltage can damage the air conditioning unit. Monitor the campsite ac voltage with a meter plugged into an outlet.
Note
Do not use the air conditioner if the campsite ac voltage is below 110 V ac. The air conditioner can be damaged.
Check the campsite voltage periodically throughout the day, especially if many neighbors are also using air conditioning.