Okay, let's break down using a 100A ATS with a load center, without a Generac generator, and with a portable generator as a temporary solution. Your general approach is correct, but there are some important details to address.

Understanding the Goal

You want to use a 100A Automatic Transfer Switch (ATS) now with a portable generator, and have it ready to integrate with a future standby generator (possibly, but not necessarily, a Generac). The ATS will automatically switch the load center between utility power and generator power when utility power fails.

Key Considerations Compatibility

Not all ATS units are created equal. Some are designed specifically for Generac generators and might have proprietary control signals or voltage requirements. Others are more universal. Verify that the ATS you have or plan to purchase is compatible with a non-Generac generator. Read the ATS manual. Pay close attention to the voltage and control signal requirements.

Neutral Bonding

This is critical for portable generators. Portable generators often have a floating neutral, which means the neutral is not bonded to the generator's frame. This is unsafe for connecting to a house electrical system without taking specific steps. Your ATS needs to handle this situation properly. You typically need to bond the neutral at the generator when using it with an ATS. Failure to do this can cause electrical shock hazards and damage to equipment. You can purchase a neutral bonding plug.

Power Rating

Make sure the portable generator is adequately sized to handle your essential loads connected to the ATS-fed load center. Don't overload the generator! Also, verify the continuous amp rating of the portable generator output. A generator might advertise a peak wattage, but the continuous wattage (and thus amperage at 240V) is what matters for sustained use.

Safety

This is electrical work. If you are not comfortable with electrical wiring, hire a qualified electrician. Incorrect wiring can lead to fire, electrical shock, and damage to equipment.

Your Proposed Wiring

Here's a breakdown of your wiring proposal, with important clarifications:1. "12 Volt DC to ATS at 194 and Ground" This sounds like the control power for the ATS itself. Some ATS units require a 12V DC supply to operate their control circuits. Make sure your ATS actually requires 12V DC. If it does, confirm the polarity and the amperage draw. Connect a suitable 12V DC power supply (e.g., a small battery charger or a dedicated power adapter) to these terminals. Make sure your ATS specifies DC Voltage.2. "240 volt line to N1 N2 # 23" N1 and N2 These are the terminals for the generator's 240V output. Connect the two hot wires (usually black and red) from the portable generator's 240V outlet to these terminals. #23: I'm guessing "#23" refers to a Neutral connection point within the ATS. Connect the Neutral wire from the portable generator's 240V outlet to this terminal. Remember the neutral bonding issue mentioned above!3. Ground: Most ATS units have a dedicated ground terminal. Connect a properly sized ground wire from the portable generator's frame to the ground terminal in the ATS.

Steps for Installation (Assuming a Compatible ATS)This is a general outline; always refer to the ATS and generator manuals for specific instructions.1. Safety First: Disconnect power to the main panel before working on the ATS installation. Wear appropriate safety gear (gloves, eye protection).2. ATS Mounting: Mount the ATS in a suitable location, near your main electrical panel or subpanel. Ensure proper ventilation.3. Wiring the ATS: Utility Input

Disconnect the utility power feed from your load center. Connect the utility power feed to the appropriate terminals on the ATS.

Load Output

Connect the output terminals of the ATS to the terminals of your load center.

Generator Input

Connect the portable generator's 240V output (hot wires, neutral, and ground) to the N1, N2, Neutral, and Ground terminals on the ATS, as described above.

Control Wiring: Connect the 12V DC (if required) to the appropriate terminals on the ATS.4. Neutral Bonding (Critical): Check Your Generator

Does your portable generator have a floating neutral or a bonded neutral? Most have a floating neutral.



Bond the Neutral (If Floating)

You MUST bond the neutral at the generator. This is commonly done by using a neutral bonding plug in a spare outlet on the generator. Research "neutral bonding plug" or "floating neutral generator" for detailed instructions.5.

Testing:

Start the Generator

Start the portable generator.

Verify Voltages

Use a multimeter to verify that you have 240V between the hot wires (N1 and N2) and 120V between each hot wire and neutral.

Simulate a Power Outage

Turn off the main breaker to your house. The ATS should automatically switch to generator power. Verify that the circuits powered by the ATS-fed load center are now receiving power from the generator.

Restore Utility Power

Turn the main breaker back on. The ATS should automatically switch back to utility power.

Important Considerations and Warnings

Permitting

Check with your local electrical authority for permitting requirements. An ATS installation may require a permit and inspection.

Load Calculation

Do a proper load calculation to ensure that the portable generator can handle the loads connected to the ATS-fed load center.

Carbon Monoxide

Never operate a portable generator indoors or in an enclosed space. Carbon monoxide is deadly. Place the generator outdoors in a well-ventilated area.

Extension Cords

Avoid using long extension cords. If you must use them, use heavy-duty cords of the appropriate gauge to prevent voltage drop.

In summary:Your general approach is correct, but the details are critical. Confirm ATS compatibility, address the neutral bonding issue*, ensure proper wiring, and prioritize safety. If you are not comfortable with electrical work, hire a qualified electrician. Good luck! Flag for review