RV Batteries
Diagnosis of battery condition, charging behavior and related connection problems.
- Lead-acid, AGM and lithium systems
- Low-voltage complaints
- Battery not holding charge
- Connection and cable concerns
12V Electrical & Charging
RV Battery, Converter & Charging System Service
Mobile diagnosis for RV batteries, converters, inverter/chargers, DC-DC chargers and related charging-path problems. We measure the system before recommending parts.
Systems We Diagnose
Battery, Converter & Charging Systems
Charging complaints can involve the battery, converter, inverter/charger, DC-DC charger, wiring, protection devices or the source feeding the system.
Converters & Chargers
Testing of converter output and charging behavior when shore power is available.
- No charging on shore power
- Low or unstable DC voltage
- Converter output concerns
- Fuse and distribution checks
Inverters & Inverter/Chargers
Accessible diagnostics for inverter operation, pass-through and charging functions.
- No AC output
- Unexpected shutdown
- Transfer/pass-through issues
- Charging-mode concerns
DC-DC Charging
Troubleshooting of alternator-to-house charging systems used in many motorhomes and vans.
- No charge while driving
- Low charge rate
- Control/enable issues
- Input/output voltage checks
Solar Charging Support
Basic diagnosis of charging-path problems where solar integrates with the battery system.
- Battery not charging from solar
- Controller input/output checks
- Connection concerns
- System interaction
Battery Disconnect & Distribution
Diagnosis of disconnects, fuses, breakers and distribution points that can interrupt charging.
- Battery disconnect issues
- Main fuse/breaker concerns
- Voltage drop
- Loose or damaged connections
Common Symptoms
When the RV Will Not Charge or Stay Powered
Battery Goes Dead Quickly
May involve battery condition, parasitic loads, charging problems or connection issues.
Charges on Shore Power but Not While Driving
May point to DC-DC charging, alternator input, control or wiring concerns.
Low 12V Voltage
Can cause lights, appliances, controls and slides to behave abnormally.
Converter Runs but Battery Does Not Charge
Requires testing of output, wiring, fuses and battery-side conditions.
Inverter Shuts Down
Can result from low battery voltage, excessive load, heat or internal faults.
Intermittent Charging
Often requires testing under the conditions that make the problem appear.
Diagnostic Process
Measure the System Before Replacing Parts
1 — Verify
Confirm the charging complaint and available power sources.
2 — Measure
Check voltage, charging output and accessible connections.
3 — Isolate
Determine which part of the charging path is failing.
4 — Repair & Verify
Complete authorized work and confirm charging behavior when possible.
Service Boundaries
What Mobile Electrical Service Can Cover
Good Mobile Fit
Accessible battery, converter, inverter, charging, fuse, breaker and connection diagnostics.
- Battery replacement where appropriate
- Converter/inverter component service
- Charging-path troubleshooting
- Accessible wiring repairs
May Require Specialty Support
Some systems may need manufacturer-specific programming, high-voltage battery service or chassis diagnosis.
- High-voltage propulsion systems
- Internal alternator repair
- Major harness replacement
- Manufacturer-restricted systems
Standard Rates
Charging-System Diagnostic Pricing
Mobile Service Call
$75
Standard mobile service-call fee.
First Diagnostic Hour
$150
Initial diagnostic labor.
Additional Labor
$150/hr
Additional authorized diagnostic or repair labor.
Extended Travel
$2/mi
Beyond the normal 30-mile service area.
Before the Appointment
Send the Information That Helps Us Prepare
Battery Information
Send battery type, quantity, age and any labels or model numbers you can see.
Describe When It Fails
Tell us whether the problem occurs on shore power, while driving, on generator or during boondocking.
Photos & Readings
Photos of battery banks, chargers, inverters, controllers and any displayed fault codes are helpful.
FAQ
Frequently Asked Questions
Can you test lithium RV batteries?
We can diagnose many accessible lithium battery and charging-system concerns, including system voltage, charging behavior and visible BMS-related symptoms. Internal battery service may be manufacturer-specific.
Why is my RV battery not charging on shore power?
Possible causes include converter/charger problems, blown protection devices, poor connections, battery issues or AC supply problems. Testing is needed to isolate the cause.
Do you work on DC-DC chargers?
Yes. We can diagnose many accessible DC-DC charging systems used between chassis and house battery banks.
Can you install a replacement converter or charger?
Yes, when the replacement is compatible, accessible and appropriate for mobile installation.
Do you diagnose inverter problems?
Yes. We can test many inverter and inverter/charger complaints including no output, shutdowns, pass-through issues and charging concerns.
What should I send before scheduling?
Send RV year/make/model, battery type, charger or inverter model numbers, symptoms and any fault codes or photos.
MilTech RV
Having Trouble Keeping the RV Charged?
Tell us when the charging problem happens, what battery system you have and which charger, converter or inverter is installed.