MDC OFF-GRID extreme XT12HR - Page 95

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SYMPTOM
POSSIBLE CAUSE
REMEDY
CONTROL PANEL & ACCESSORIES
Control panel
unresponsive
No power to panel Check battery and ensure proper connection
Faulty wiring or loose connections Inspect and secure all wiring connections
Tripped circuit breaker or fuse
Reset circuit breaker or replace fuse if applicable
Display screen
flickering
Low battery voltage Charge battery to proper voltage level
Loose or damaged display wiring
Check and reseat display connections
Switches not
activating functions
Faulty switch or relay Test switch functionality and replace if needed
CHARGING FROM TOW VEHICLE
No charge, alternator
light not showing
No trigger wire activation for DC-DC
charger
Ensure trigger wire is connected to ignition
power
Blown fuse in charging circuit Inspect and replace fuse
No charge, alternator
& solar light both on
Incorrect DC-DC charger setting Ensure charger is set to accept alternator input
Weak charge from
alternator
Smart alternator voltage fluctuating
Install a DC-DC charger with ignition trigger
activation
Poor wiring connection between tow
vehicle and trailer
Inspect and secure all wiring connections
Alternator not
charging
Solar priority mode engaged
Disconnect solar input to force alternator
charging
Ignition trigger not detected
Confirm ignition trigger wiring to tow vehicle is
correct
Hybrid charging mode limiting alternator
Reduce solar input below 25A to enable
alternator assist
SOLAR CHARGING
No solar input
Panel not connected or faulty
Check wiring and panel connections
Controller not functioning Power cycle unit and check connections
Weak solar charging
Panels dirty or shaded Clean panels or relocate for better sun
Incorrect battery type Confirm correct setting on charger
Loose or corroded wiring Inspect and secure connections
Charging not starting
Solar voltage under 15V (loaded)
Check panel specs and wiring
Alternator mode
active too early
Solar current too low Increase current cut-off in DC Home app
Solar red LED fault Over/undervoltage or heat issue Verify voltages, cool down, and reset
Table 13
For detailed information on the solar system setup, components, and best practices, refer to
"Charging from the Solar (PV) System" , "Solar System Components & Operation" , and "Managing
Expectations for Solar Performance" sections of this manual. The performance of the solar charging
system depends on usage and conditions. Running high-demand appliances, such as multiple
refrigerators, without additional solar capacity can exceed the available charge rate, leading to
battery depletion. Best practices such as
pre-cooling refrigerators, tight packing, and managing
energy-intensive loads will help optimize battery longevity. Additionally, extensive inverter use can
quickly drain battery reserves . Effective power management is essential for maintaining sufficient
charge levels while off-grid.