Understanding the 120-Volt System in Your RV

In this article, we simplify the concepts of the 12-volt and 120-volt systems in your RV, helping you understand how they work together to power your appliances and systems.

Key Differences

• 12-Volt System: Similar to what you find in automobiles, this system powers essential features in your RV.
• 120-Volt System: Powers the outlets in your home and larger appliances in your RV.

Powering the 120-Volt System

To activate your 120-volt system, simply plug the shoreline cord into an external power source or connect to a generator (if equipped). Your RV is equipped with a converter or battery charger that operates only when the shoreline cord is connected to a suitable 120V power source. This converter does two things:

1. Converts 120V AC to 12V DC to power your RV's 12-volt features.
2. Sends a low charge to your RV’s battery to keep it topped up.

120-Volt Configurations

30 Amp Service

• Most commonly found in RVs and campgrounds.
• Many features in your Keystone RV operate on 12-volt power, requiring minimal energy.
• It’s recommended to run only one major 120-volt appliance at a time to avoid tripping breakers.

50 Amp Service

• Allows for running two air conditioners and several other appliances simultaneously when connected to a 50-amp outlet.

Using Adapters

Adapters can convert electrical sources for various configurations. Here are a few options:

• 30 Amp to Standard Wall Receptacle: This adapter allows you to plug into a non-GFCI protected standard wall outlet.
• 50 Amp to 30 Amp Service: This lets you connect a 50 amp cord into a 30 amp service or a non-GFCI protected outlet.

Important Note:

• Do not run any 120-volt appliances when plugged into a standard 15-amp wall outlet, as this can cause issues.
• Adapters should only be used to run the converter, which supplies 12-volt power for interior lights and charges the battery.
• Avoid using adapters with extension cords, and never connect multiple extension cords together, as this increases the risk of operational problems, fire, property damage, and personal injury.

Breakers and Fuses

The breaker panel is located inside the unit, adjacent to the 12-volt distribution panel. Here are some important considerations:

• If using an adapter, be mindful of energy consumption, as it may increase resistance and trip breakers.
• If a fuse is blown or a breaker is tripped, always identify the cause and correct it before replacing them.
• Never install a fuse or breaker with a higher rating than specified.

Further Questions?

For more information regarding fuses, breakers, and electrical power, refer to your Keystone Owner’s Manual, consult your dealer, or contact us at 866-425-4369.

Disclaimer: The information contained in this article is deemed to be true and accurate at the time of publication. However, due to the evolving nature of our products and services, there may be changes or updates that occur after this article was published. We encourage users to verify the contents and consult with their dealer or Keystone RV for the most current information. If you have any questions or require further clarification, please do not hesitate to contact your dealer or reach out to Keystone RV directly.