RV Converter & Inverter Repair Near Me
Coast to Coast RV Repair provides mobile converter & inverter service service on-site at your campground or driveway across Florida - certified technicians, same-week scheduling.
Coast to Coast RV Repair provides mobile converter & inverter service service on-site at your campground or driveway across Florida - certified technicians, same-week scheduling.
Certified technicians. $299 service call. Same-week scheduling. Call (866) 437-4848.
Converter Failure Modes - Progressive Dynamics, WFCO, and Inteli-Power
The three most common OEM converters in Florida RVs are the Progressive Dynamics PD9100 series, the WFCO WF-8900 series, and the Parallax Power 7300 series. All three fail in the same two ways: undercharge and overcharge. Undercharge happens when the converter's main transformer winding shorts partially - the unit stays on but output voltage drops to 12.8V - 13.2V, which looks like float mode even in bulk. Batteries slowly sulfate over weeks. Overcharge happens when the voltage regulation circuit loses feedback - the unit pushes 15V - 16V into a lead-acid bank continuously. The WFCO WF-8955 is the most common overcharge failure we see in Florida because its potentiometer-based voltage reference drifts in heat.
Pure Sine Wave vs Modified Sine Wave Inverters - What Actually Matters
A modified sine wave inverter produces a stepped square wave that approximates 120V AC. Most resistive loads run fine on modified sine. The problems start with inductive and electronic loads. Microwave ovens on modified sine pull 15% - 20% more current and run hotter, shortening magnetron life. Variable-speed appliances (the Dometic CCC2 control board, residential refrigerator compressors, CPAP machines) produce the 120Hz audible hum the Naples Aspire owner heard - that hum represents wasted energy being dissipated as heat in the motor windings. We exclusively install pure-sine inverters: the Victron MultiPlus-II series, the Magnum Energy MSH3012M, and the Xantrex Freedom XC Pro 2000.
Inverter Sizing - Calculating the Right Capacity for Your Rig
Undersized inverters are the most common DIY mistake we correct. The calculation starts with peak surge demand, not average consumption. A residential refrigerator compressor surges to 6x running watts on startup - a Frigidaire FFTR1821QS draws 150W running but 900W on startup. A Dometic Blizzard NXT 15,000 BTU rooftop AC surges to 2,700W on compressor start. Running both on a 2,000W inverter trips the overload relay every time the fridge compressor kicks on while the AC is running. We size inverters with a Southwire SB50 power meter that logs 24-hour peak demand. Cable sizing is equally critical - a 3,000W inverter at 12V draws 250A peak. That requires 4/0 AWG or dual 2/0 AWG runs under 6 feet.
Also see: Electrical & Solar Services
This page covers converter & inverter service specifically. For the full range of electrical & solar services we offer, visit our Electrical & Solar service overview.
Case Study: The Xantrex Freedom SW 3000 had a failed AC output filter capacitor - the 680 microfarad/450V Nichicon electrolytic on board C14 had vented, reducing the unit to a modified-sine-wave output that caused the 120Hz hum and could not maintain stable DC bus voltage above 13.1V during charge mode.
RV: 2019 Entegra Coach Aspire 44B • Location: Naples Motorcoach Resort, Site 27 • City: Naples
Symptom: The owner reported the Xantrex Freedom SW 3000 inverter/charger producing a loud 120Hz buzzing hum through the cabin speakers when inverted, the residential refrigerator compressor stopping mid-cycle with a low-voltage alarm on its Norcold N8MXL control board, and the coach battery bank reading only 11.2V after a full night plugged into 50-amp shore power.
Diagnosis: Technician connected a Fluke 435-II power quality analyzer to the Aspire's inverter AC output and measured 8.7% Total Harmonic Distortion - specification for the Freedom SW 3000 is under 3% THD. DC bus voltage under a 40A charge load measured 13.08V, well below the 14.4V absorption target. Opening the inverter chassis confirmed the Nichicon C14 capacitor dome was bulged 3mm and showed electrolyte residue on the PCB.
- Battery State Assessment: Loaded the four Interstate 6V-GC2 golf cart batteries with a Midtronics MDX-650P conductance tester - three cells showed 520 - 540 CCA (acceptable), one showed 280 CCA (failed cell), confirming battery damage from chronic undercharge.
- Inverter AC Output Quality Test: Clipped the Fluke 435-II across the Aspire's inverted 120V outlet and ran a 1,500W resistive load - THD measured 8.7%, confirming a degraded sine wave output from the Xantrex.
- Inverter Chassis Inspection: Disconnected DC cables, removed the Xantrex Freedom SW 3000 from the battery bay mounting bracket, and visually inspected the PCB - found the Nichicon 680uF/450V capacitor on C14 domed and vented.
- Unit Replacement: Installed a Victron MultiPlus-II 12/3000/120-50 in place of the Xantrex - the MultiPlus-II is a direct 50-amp shore input match and uses the same 2/0 AWG DC cable run already in the bay.
- Charge Profile Configuration: Programmed the Victron VE.Configure 3 software via MK3-USB dongle - set absorption voltage to 14.4V, float to 13.6V, and bulk current to 100A to match the Interstate GC2 battery bank capacity of 440Ah.
- Failed Battery Replacement: Swapped the failed Interstate 6V-GC2 with a new Interstate SRM-200 and equalized the bank at 15.5V for 3 hours under the new Victron charge profile.
- Final Load Test: Ran the Norcold N8MXL residential refrigerator, the Aqua-Hot 450D hydronic system pump, and the coach lighting on inverter for 90 minutes - THD measured 1.2%, DC bus held at 14.38V during absorption, zero alarms.
Outcome: The Entegra Coach ran flawlessly through a 10-day stay at Naples Motorcoach Resort. The owner scheduled a follow-up solar install to pair with the new Victron MultiPlus-II using its built-in MPPT capability.
Time on-site: 3 hours 45 minutes • Total cost: $299 service call + $1,285 Victron MultiPlus-II + $380 Interstate SRM-200 battery + $285 labor • Dealer alternative: Entegra-authorized dealer in Fort Myers quoted $385 diagnostic, 7-10 business day parts lead time, and $2,850 installed for a factory-spec Xantrex replacement.
“The buzzing drove us crazy for two weeks. They showed me the scope reading on the old inverter and I could actually see why the fridge was alarming. New unit was dead quiet.”
RV Inverter/Charger Comparison - Top Units We Install
| Model | Type | Output Watts | Charger Amps | Shore Input | THD (Pure Sine) | Installed Price Range |
|---|---|---|---|---|---|---|
| Victron MultiPlus-II 12/3000/120-50 | Inverter/Charger | 3,000W | 120A | 50A | <3% | $1,450 - $1,850 |
| Magnum Energy MSH3012M | Inverter/Charger | 3,000W | 100A | 30A | <5% | $1,350 - $1,650 |
| Xantrex Freedom XC Pro 2000 | Inverter/Charger | 2,000W | 80A | 30A | <3% | $985 - $1,250 |
| Progressive Dynamics PD9160AL | Converter Only | N/A | 60A | 30A | N/A | $385 - $485 |
| WFCO WF-8955 | Converter Only | N/A | 55A | 30A | N/A | $285 - $385 |
| AIMS Power PWRI300012120S | Inverter Only | 3,000W | None | N/A | <3% | $485 - $685 |
Signs You Need Converter & Inverter Service
- ✓Check converter output voltage at the battery terminals with a Fluke 117 after 8 hours on shore power - should read 14.2V - 14.6V in bulk or 13.5V - 13.8V in float, not 12.8V - 13.2V
- ✓Listen for a 120Hz hum through speakers or appliance motors when running on inverter - this is the clearest sign of a modified sine wave or failing sine wave output filter
- ✓Confirm inverter output wattage capacity against your actual peak load - add up running watts for all appliances then multiply the largest motor by 6x for surge demand
- ✓Check the converter chassis and surrounding cabinet for heat discoloration, a burnt smell, or electrolyte crust on vents - all indicate imminent or recent failure
- ✓Verify DC cable gauge from the inverter to the battery bank - a 3,000W inverter requires 4/0 AWG or dual 2/0 AWG at lengths under 6 feet to avoid voltage drop and heat
- ✓Test battery bank health with a conductance tester before installing a new inverter - a weak battery bank will false-trigger overload shutdowns
Converter & Inverter Service - Pricing
Typical price range: $195 - $1,450
All calls start with a $299 service-call fee that covers the technician's trip to your location and the first hour of diagnosis. That $299 applies toward any repair you authorize - it is not an additional charge on top of the repair. Pricing shown is a national average range; your exact quote is provided in writing on-site before any work begins.
Converter & Inverter Service - Common Questions
Straight answers from our converter & inverter service service call log.
My converter keeps my batteries at 12.8V even after 12 hours on shore power - is it failing?
Yes. A healthy converter in bulk mode pushes 14.2V - 14.6V into the bank. At 12.8V you are in surface charge territory only - the plates are not being fully charged and sulfation begins within weeks. The most common cause on WFCO WF-8935 and WF-8955 units is a drifted voltage reference potentiometer.
Can I run my residential refrigerator on a 1,500W inverter?
Not safely. The typical residential fridge compressor surges to 900W - 1,200W on startup. A 1,500W inverter hits its surge limit immediately and either trips or runs the compressor at reduced voltage, which shortens the compressor life.
How long does a converter replacement take on-site?
A straight converter swap on a 30-amp rig takes 60 - 90 minutes. Inverter/charger swaps on a Class A with a bay-mounted Magnum or Xantrex run 2.5 - 4 hours because we re-terminate the DC cable runs and set the charge profile on the new unit before we leave.
My inverter shows a fault light but the manual just says check connections - what does that mean?
On the Xantrex Freedom SW 3000 and Freedom X series, a steady red fault LED combined with a brief output then shutdown usually indicates an output short or an overtemperature condition. On Magnum Energy MS-PAE series, a fault 61 code means AC output relay failed to close. Both require a technician with the unit's service manual and a clamp meter to diagnose correctly.
Is it worth repairing a Magnum Energy MSH3012M or should I just replace it?
If the unit is under 5 years old and the failure is a discrete component (capacitor, relay, fuse board), repair is worth doing - parts run $50 - $200 and the Magnum chassis is robust. If the inverter is 8+ years old or the transformer or MOSFET bank is the failed item, replacement makes more sense.
Sources and References
More Electrical & Solar Services
Other specialized repairs under electrical & solar - all done at your location, no tow required.
Where We Provide Converter & Inverter Service in Florida
Coast to Coast RV Repair runs converter & inverter service jobs across these cities. Click your closest one for local-specific info, response times, and campground coverage.