The following is a quick reference for Magnum Energy inverter/charger to diagnose typical symptoms. Always refer to your full user manual.
| Symptom | Possible Cause | Possible Solution |
|---|---|---|
| No output power and inverter LED is OFF | Inverter is switched off. | Press the inverter on/off button to turn the inverter on. |
| Battery voltage is too low or disconnected from the inverter. | 1. Confirm that the battery disconnect switch, if equipped, is turned on. 2. Using a volt meter, check the voltage at the DC terminals of the inverter. If greater than 9V, perform a soft reset. If voltage is less than 9V, charge the batteries or check for blown fuse or loose connections. |
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| Battery voltage is too high (usually greater than 16V on a 12V system) | 1. Check battery wiring to make sure it is properly wired for the inverter (12V/24V/48V nominal). 2. Disconnect external charging sources that could be causing battery voltage to increase higher than it should. |
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| The inverter has detected that the FETs (Field Effect Transistor) and/or transformer inside have exceeded their operating temperature (Transformer > 117°C/243°F, FETs > 90°C/194°F). | 1. Reduce loads on the AC output if inverting, or lower charge rate if charging the batteries. Once temperature is reduced, the unit will automatically restart. 2. Ensure the inverter is not in a hot area and has proper ventilation. Once temperature is reduced, the unit will automatically restart. 3. Check that the internal fans are running. If the Tfmer/Xfm (transformer) or FET temperatures are above 60C/140F and the fans are not running, contact authorized service center for repair. 4. If internal reading shows 151°C/303°F, this indicates a thermistor has shorted and the unit will need to be repaired. Contact an authorized service center for repair. |
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| The inverter has detected a load on the AC output that is larger than its capacity. | 1. Remove excessive AC loads from the inverter output. Perform a soft reset and press the inverter on/off pushbutton to turn the inverter back on. 2. Check for wiring shorts on the AC output by disconnecting all loads. Perform a soft reset and press the inverter on/off pushbutton to turn the inverter back on. 3. Check if the AC output wires are incorrectly wired. Correct wiring as needed. Perform a soft reset and press the inverter on/off pushbutton to turn the inverter back on. |
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| There could be an internal problem with the inverter other than causes listed above. | 1. Perform a hard reset of the inverter. If the inverter remains inoperable, the inverter will require repair at an authorized service center. | |
| No or low output power and green LED is flashing once every second. | The inverter is in Search Mode. | 1. Turn on an AC load greater than Search Mode setting (5 watts default, 5-50 watts adjustable). 2. Turn Search Mode off using a remote. |
| Low output or surge power and Green LED is flashing once every two seconds. | Battery cables/connections may be loose or corroded. | Clean and tighten all DC cables. |
| Loose AC output connections. | Tighten AC output connections. | |
| Battery voltage may be too low. | Check battery voltage, recharge or replace batteries as necessary. | |
| Battery cables are too long or too small, causing a large voltage drop. | Verify recommended cable lengths and gauges from the manual. Replace cables as necessary. | |
| Low charging rate when connected to AC power. | Charge rate on remote is set too low and is limited the current going to the batteries. | Adjust charge rate setting on remote. |
| Low AC voltage present at inverter's AC input. | Check AC input voltage at inverter, if less than 90VAC, check source for low voltage or loose connections. | |
| High load demand, not enough power left over to go to the charger. | 1. Increase SHORE setting on remote to match incoming AC source to inverter. 2. Reduce AC loads on inverter's output. |
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| Internal inverter temperatures are too high. | 1. Ensure the inverter is not in a hot area and has proper ventilation. Once temperature is reduced, the unit will automatically increase charge rate. 2. Check that the internal fans are running. If the Tfmer/Xfm (transformer) or FET temperatures are above 60°C/140°F and the fans are not running, contact authorized service center for repair. |
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| Charger does not charge. | Cables between the inverter and the batteries may be loose or corroded. | Clean and tighten all DC cables. |
| Charger is in Charger Standby mode. | Press the ON/OFF CHG button to turn charger on. | |
| The incoming AC voltage or frequency is outside of the acceptable range for the inverter. | Verify proper AC input voltage and frequency for the inverter. | |
| Battery voltage may be too low for the charger to come on. | Check battery voltage, recharge or replace batteries as necessary. | |
| While charging, the DC charge voltage is higher or lower than expected. | If the Battery Temperature Sensor (BTS) is installed, the DC voltage will increase or decrease depending on the temperature around the BTS. | 1. Confirm that the BTS temperature reading is accurate in the Tech Menu/Temperatures screen. 2. If BTS reads 151°C/303°F, BTS should be replaced. |