AGS Starting RV Generator with AC Load: Modern Systems vs Old Rules

The Quick Answer

Your AGS system is actually designed to handle this exact scenario safely, and modern RV generators can start under load without damage. The old advice about never starting with AC load was more relevant to older generators from the 1980s-90s that lacked sophisticated load management. Your AGS likely has a built-in delay that starts the generator first, lets it stabilize for 30-60 seconds, then switches on the AC - so you're not actually starting under full load. This is perfectly fine for your dog's comfort while you're away, and there's no need to pre-start the generator before leaving.

What's Causing This

The concern about starting generators under load comes from older technology where the initial inrush current from an AC compressor could cause voltage spikes and stress the generator's contactors and windings. However, modern RV generators (especially those from the last 15-20 years) have much better voltage regulation and soft-start capabilities.

Your AGS (Automatic Generator Start) system incorporates load sequencing specifically to prevent the problems you're worried about. When the thermostat triggers the AGS, it first starts the generator and allows it to reach proper operating RPM and voltage stability. Only after this stabilization period (typically 30-60 seconds depending on your system) does it close the transfer switch and energize the AC circuit.

Additionally, most modern RV air conditioners have soft-start kits that reduce the initial current draw, or starting capacitors that provide better starting torque. The "hard starting" effect that damages contactors is mostly eliminated with proper equipment sequencing, which your AGS provides automatically.

Tools You'll Need

• Multimeter to check voltage stability
• AGS manual or control panel access to verify delay settings
• Flashlight for inspecting connections
• Basic hand tools (screwdrivers) for panel access
• Generator hour meter reading or logbook to track usage
• Contact cleaner spray if needed for maintenance

Step-by-Step Fix

1. Locate your AGS control panel and check the "start delay" or "load delay" setting. This should be set to at least 30 seconds, preferably 60 seconds. This ensures the generator stabilizes before the AC kicks on.
2. Test the sequence by manually triggering the AGS. You should hear the generator start, run for the delay period, then hear the transfer switch engage and the AC start. If the AC starts immediately with the generator, your delay needs adjustment.
3. Check your generator's voltage output with a multimeter during the startup sequence. It should stabilize at 120V ±5% before the load engages. If voltage is erratic, your generator may need carburetor adjustment or maintenance.
4. With the generator shut off and both shore power and generator power disconnected, inspect the transfer switch contacts annually. Look for any signs of pitting, burning, or carbon buildup. Clean contacts with appropriate contact cleaner if needed.
5. Monitor your generator's hour meter and perform regular maintenance (oil changes, air filter, spark plugs) according to the manufacturer's schedule. A well-maintained generator handles load starts much better.
6. Consider upgrading to a soft-start kit for your AC if you don't have one. This reduces starting current by 65-75% and makes the load even gentler on your system.

When to Call a Pro

Call a professional if your AGS isn't providing proper start delays, or if you notice the generator struggling to maintain voltage when the AC engages. Signs of problems include dimming lights, the generator bogging down, or the AC cycling on and off rapidly. Also seek professional help if your transfer switch contacts show significant pitting or burning - this indicates the load sequencing isn't working properly.

If your generator is older than 15-20 years and lacks modern voltage regulation, a technician can evaluate whether installing a soft-start system or upgrading the AGS programming would be beneficial. They can also perform load testing to ensure your generator can handle the AC starting current safely.

Finally, if you're unsure about your specific AGS model's capabilities or settings, a certified RV technician can verify the programming and ensure it's optimized for your particular generator and AC combination. This one-time consultation can give you confidence in using the system for your dog's comfort without worry.