There’s nothing quite like hitting the open road in your RV, but when the temperatures soar, a reliable air conditioner isn’t just a luxury – it’s a necessity! If your RV’s AC unit is struggling to start, making odd noises, or just not cooling like it used to, the culprit might be a faulty RV air conditioner start capacitor. This small but mighty component plays a crucial role in getting your compressor and fan motors running efficiently.
A well-functioning capacitor gives your AC the jolt it needs to kick into gear, preventing undue strain on your electrical system and ensuring a comfortable interior. But with so many options out there, how do you pick the right one? We’ve done the legwork for you, diving into the best RV air conditioner start capacitor options available to help you keep your cool on your next adventure. Let’s get started!
Understanding Your RV AC Capacitor
Before we jump into the reviews, it’s helpful to know what you’re looking for. RV AC units typically use either a run capacitor, a start capacitor, or a combination of both (a dual-run capacitor). The start capacitor provides a momentary boost to get the compressor and fan motor turning, while the run capacitor helps maintain efficient operation once they’re running. If your AC hums but doesn’t start, or trips a breaker, a failing start capacitor is a prime suspect.
Our Top Picks for RV Air Conditioner Start Capacitors
Here are our detailed reviews of 7 excellent options to get your RV AC humming happily again.
1. 3312195.000 RV AC Air Conditioner Motor Capacitor 60/5 MFD
This dual-run capacitor is a versatile choice designed to breathe new life into a range of RV air conditioning units. What makes it stand out is its wide compatibility with popular models and its robust build, ensuring longevity even under demanding RV conditions. It’s engineered to stabilize voltage and current, fine-tuning motor speed and power for enhanced AC performance right out of the box.
- Key Features:
- Wide compatibility with various RV AC models (e.g., 57915.741, B595146, B59146).
- Detailed specifications: 370VAC, 60/5 MFD, 50/60Hz.
- Boosts air conditioner performance by stabilizing voltage/current.
- Easy installation with clearly labeled “Herm,” “Fan,” and “C” terminals.
- Built for longevity and safety with explosion-proof technology and nickel-plated copper terminals.
- Pros:
- Excellent for a broad range of RV AC units.
- Simplifies wiring as a dual-run capacitor.
- Enhanced durability and safety features.
- Noticeably improves AC system efficiency.
- Cons:
- Always requires verifying your specific AC unit’s specifications before purchase.
- User Impressions: RVers frequently praise this capacitor for its straightforward installation and the immediate improvement in their AC’s starting power and overall performance. Many find it a cost-effective solution to common AC issues.
See it on Amazon here
2. 8333A9021 Air Conditioner Capacitor Replacement for…
When your Coleman-Mach RV air conditioner is struggling, this comprehensive 8333A9021 Hard Start Kit is often the perfect solution. It’s not just a capacitor; it’s a complete package designed to improve startup reliability and efficiency, especially for 8000 series 11,000 and 13,500 BTU models. If your AC is producing hot air, humming loudly, or shutting down unexpectedly, this kit is specifically engineered to tackle those problems head-on.
- Key Features:
- Complete hard start kit: includes start capacitor, PTCR start device, installation bracket, and connecting wires.
- Specifically designed for Coleman-Mach RV ACs (8000 series, 11000 & 13500 BTU).
- Addresses common AC problems like hot air, humming, and sudden shutdowns.
- Extensive compatibility with numerous Coleman-Mach model numbers.
- Aims for smoother operation and improved air conditioning efficiency.
- Pros:
- A comprehensive kit means you have everything you need.
- Highly effective for specific Coleman-Mach AC units.
- Improves startup reliability, extending the AC’s life.
- Solves common frustrating AC malfunctions.
- Cons:
- Very specific compatibility; ensure your model is listed.
- Requires careful handling during installation due to power safety.
- User Impressions: Owners of compatible Coleman-Mach units rave about this kit, stating it’s a “game-changer” for their AC’s performance. The complete nature of the kit and its ability to resolve persistent startup issues are frequently highlighted.
See it on Amazon here
3. 8333A9021 Air Conditioner Hard Start Kit by AMI PARTS,Fits…
Another excellent choice for Coleman-Mach RV AC units, the AMI PARTS 8333A9021 Hard Start Kit, is a direct competitor to the previous one, offering the same complete solution. This kit focuses on extending the lifespan of your air conditioner by preventing frequent starts and shutdowns due to low voltage. It accelerates the AC’s starting speed, ensuring stable temperature changes and smoother overall operation, which is crucial for maintaining RV comfort.
- Key Features:
- Perfect combination kit: includes start capacitor, PTCR start device, installation bracket, and connecting wires.
- Fits all Coleman 8000 series 13500 BTU and 11000 BTU air conditioners.
- Extends life span by solving frequent starting/shutting down issues caused by low voltage.
- Accelerates AC starting speed and stabilizes temperature changes.
- Extensive list of compatible Coleman-Mach model and series numbers.
- Pros:
- Comprehensive kit for specific Coleman-Mach models.
- Directly targets and resolves intermittent AC operation.
- Contributes to a longer operational life for your AC unit.
- Helps maintain stable cooling in challenging conditions.
- Cons:
- Specific compatibility requires double-checking your AC model number.
- Power disconnection is essential before installation.
- User Impressions: Customers often report this kit as an easy and effective fix for their ailing Coleman-Mach air conditioners. The relief from humming and tripping breakers is a common theme, with users appreciating the extended AC lifespan it provides.
See it on Amazon here
4. SPP6 Hard Start Capacitor Replacement 115V Thru 288VAC Hard…
The SPP6 Hard Start Capacitor is a universal hero for struggling compressors, whether in an RV AC or another appliance. This booster capacitor is renowned for its ability to dramatically increase a compressor’s starting torque by up to 500%, effectively saving “stuck” compressors. Its solid-state relay design ensures no loose parts and incredibly simple wiring – just connect it across your run capacitor for an inexpensive and effective fix.
- Key Features:
- Increases compressor’s starting torque by 500%.
- Replaces numerous part numbers (SPP6, TJ90HS6, AP4502872, etc.).
- Universal application across a wide voltage range (115V through 288VAC).
- Solid-state relay design for simplicity and reliability.
- Easy to install with minimal wiring needed.
- Pros:
- Highly effective for difficult-to-start compressors.
- Universal design means broad applicability.
- Simplifies troubleshooting and repair; often avoids service calls.
- Cost-effective solution for extending compressor life.
- Cons:
- Primarily focused on starting torque; may not address other AC issues.
- Always disconnect power before handling.
- User Impressions: Users frequently call the SPP6 a “miracle worker” for AC units that hum but won’t start. Its ease of installation and immediate, significant improvement in compressor starting power are consistent highlights in customer feedback.
See it on Amazon here
5. 3313107.018 Capacitor Compatible with Dometic RV Air…
If you’re a Dometic RV owner, this 3313107.018 capacitor is engineered specifically for your unit. It’s a run capacitor that ensures consistent starting torque and smooth motor operation, directly replacing the original Dometic part. Crafted with a heavy-duty metal casing and flame-retardant resin, this capacitor is built to endure the harsh conditions of RV life, offering superior resistance to high temperatures and electrical stress while notably reducing equipment noise and vibration.
- Key Features:
- Product parameters: 30μF (±5%) capacitance, 370V/450VAC, 50/60Hz frequency.
- Perfect compatibility as a direct replacement for Dometic 3313107.018 and related models.
- Durable materials: heavy-duty metal casing and flame-retardant resin encapsulation.
- Superior performance: consistent starting torque, smooth motor operation, reduced noise and vibration.
- Important safety note for proper installation.
- Pros:
- Designed specifically for Dometic RV AC units.
- Exceptional durability for long-term reliability.
- Improves motor efficiency and reduces operational noise.
- Provides consistent and smooth cooling performance.
- Cons:
- Primarily for Dometic models, limiting universal application.
- Requires strict adherence to safety protocols during installation.
- User Impressions: Dometic owners appreciate the perfect fit and the restoration of quiet, efficient cooling. Many mention the robust build quality as a significant plus, leading to confidence in its longevity.
See it on Amazon here
6. Screw Man RV Air Conditioner Motor Capacitor 55/15 MFD…
The Screw Man RV Air Conditioner Motor Capacitor, identified by model number 3314471.017, is a dual-run capacitor focused on comprehensive motor protection and energy efficiency. Beyond just starting your AC, it works to provide extra current for a smooth motor start, reducing stress on the grid and safeguarding motor windings. By improving the power factor, this capacitor also helps increase power utilization, making your AC unit run more efficiently and potentially lowering energy consumption.
- Key Features:
- Model number: 3314471.017 Air Conditioner Motor Capacitor.
- Protects the motor by ensuring smooth starts and reducing grid stress.
- Improves power factor for increased power utilization and efficiency.
- Enhances energy efficiency by optimizing motor speed and power.
- Stabilizes voltage and running current, reducing motor noise and vibration.
- Pros:
- Offers all-around protection for your AC motor.
- Contributes to significant energy savings.
- Reduces operational noise and vibration for quieter cooling.
- Enhances the overall health and lifespan of your AC unit.
- Cons:
- Specific model number compatibility (3314471.017) should be checked.
- Technical specifications like voltage are not explicitly detailed in the provided text.
- User Impressions: Customers find this capacitor to be a reliable workhorse, noting its positive impact on their AC’s smooth startup and quieter operation. Its contribution to energy efficiency is a frequently appreciated benefit among RV owners.
See it on Amazon here
7. 1497-3601 Soft Start for RV Air Conditioner,AC Capacitor…
This isn’t your average RV air conditioner start capacitor; it’s a true soft start solution for Coleman 450XX, 470XX, and 480XX series air conditioners. The 1497-3601 Soft Start kit dramatically reduces the high voltage surge required for AC compressors, cutting inrush current by up to 75%. This incredible feature prevents generator overload, circuit breaker tripping, and allows you to run your AC more easily on smaller generators or limited shore power. Plus, it significantly quiets the compressor startup, ensuring a more peaceful RV experience.
- Key Features:
- Compatible with Coleman 450XX/452XX/470XX/472XX/480XX/482XX Series Air Conditioners.
- Reduces inrush current by 75%, preventing generator overload and circuit breaker trips.
- Lowers overall power consumption during startup.
- Dramatically reduces vibration and noise of the AC compressor.
- Made of high-quality semiconductor materials with a flame-retardant, dustproof ABS shell.
- Easy to install with an included installation bracket for seamless integration.
- Comes with a one-year warranty and dedicated customer service.
- Pros:
- Essential for running AC on smaller generators or limited power.
- Significantly quieter AC startup.
- Extends the life of your AC and electrical system.
- High-quality, durable construction.
- Excellent customer support and warranty.
- Cons:
- Higher initial investment compared to a standard capacitor.
- Compatibility is specific to certain Coleman series.
- User Impressions: RVers who rely on generators or have power limitations absolutely love this soft start kit. They describe it as “transformative” for their AC’s startup, enabling them to run their units without fear of tripping breakers or straining their power source. The quiet operation is an added bonus.
See it on Amazon here
Frequently Asked Questions (FAQ)
Keeping your RV cool is paramount for comfort on the road. Here are some common questions about RV AC capacitors.
What is an RV air conditioner start capacitor and what does it do?
An RV air conditioner start capacitor is an electrical component that provides a strong, temporary jolt of electricity to help the compressor and fan motors overcome initial inertia and start running. Without it, your AC unit might hum, struggle to start, or not start at all, potentially damaging the motor.
How do I know if my RV AC capacitor is bad?
Common signs of a failing capacitor include:
– The AC unit hums loudly but doesn’t start.
– The compressor clicks on and off frequently.
– The AC fan runs, but the compressor doesn’t engage, leading to no cold air.
– Your circuit breaker trips when the AC tries to start.
– Visible swelling or leaking on the capacitor itself (always disconnect power before inspecting!).
What’s the difference between a start capacitor and a run capacitor?
A start capacitor provides a large burst of energy for a few seconds to get the motor going. It then disengages. A run capacitor, on the other hand, stays engaged during the entire operation of the motor, continuously adjusting the current and voltage to improve efficiency and maintain smooth running. Some AC units use a dual-run capacitor which combines both functions in one component.
Can I install an RV AC capacitor myself?
Yes, many RV owners with basic electrical knowledge can replace an AC capacitor. However, it’s crucial to follow safety precautions: always turn off all power to the RV AC unit and discharge the old capacitor safely before touching it. Capacitors can store a dangerous electrical charge even after power is disconnected. If you’re unsure, it’s best to consult a professional.
What are hard start kits and soft start kits?
- Hard Start Kits: These kits typically include a start capacitor and a Positive Temperature Coefficient Resistor (PTCR) device. They provide an extra boost of torque to help an aging or struggling compressor start, especially in low-voltage conditions.
- Soft Start Kits: These advanced kits dramatically reduce the initial “inrush” current that an AC compressor draws when starting. This is incredibly beneficial for RVs running on generators or limited shore power, as it prevents tripping breakers and allows the AC to start more smoothly and quietly, consuming less power upfront.
How do I choose the right RV AC capacitor for my unit?
Always check your existing capacitor or your RV AC unit’s manufacturer specifications. Key parameters to match include:
– MFD (Microfarad) rating: This is the capacitance value (e.g., 30/5 MFD, 60 MFD). Match it precisely.
– VAC (Volts AC) rating: This is the voltage rating (e.g., 370 VAC, 450 VAC). The replacement should be equal to or higher than the original.
– Physical size: Ensure the new capacitor fits in the existing mounting bracket.
– Type: Determine if you need a start, run, or dual-run capacitor.
What does MFD and VAC mean on a capacitor?
- MFD (Microfarad): This unit measures capacitance, indicating how much electrical charge the capacitor can store. It’s crucial to match the MFD rating of your old capacitor exactly (or within a small tolerance, usually ±5%).
- VAC (Volts AC): This is the voltage rating, indicating the maximum AC voltage the capacitor can safely handle. Your replacement capacitor’s VAC rating must be equal to or greater than the original capacitor’s.
How often should I replace my RV AC capacitor?
There’s no fixed schedule, but capacitors are wear-and-tear items. Their lifespan can vary widely depending on usage, environmental conditions (heat, humidity), and power fluctuations. Many last 5-10 years, but it’s not uncommon for them to fail sooner. It’s a good idea to inspect them during annual AC maintenance, especially if you notice any performance issues.
Conclusion
A reliable RV air conditioner start capacitor is more than just a component; it’s the key to consistent comfort and extending the life of your entire AC system. Whether you need a direct replacement, a hard start kit to kickstart a lagging compressor, or a soft start solution to prevent power overloads, there’s an option on our list for you.
By choosing the right capacitor, you’ll ensure your RV’s cooling system operates smoothly and efficiently, allowing you to enjoy cool, comfortable travels wherever the road takes you. Remember to prioritize safety during installation and always double-check compatibility for a hassle-free upgrade!
