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Home > Inverter Support > Pure Sine Wave Inverter Support > Pure Sine Wave (ISW) Inverters: Inverter Does Not Power Up
Pure Sine Wave (ISW) Inverters: Inverter Does Not Power Up
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How to troubleshoot when the inverter does not power up


Check DC Voltage 

  • Check DC voltage on the back of the inverter.  It must be between 10.5 and 16 volts in order for the inverter to operate correctly. (Use Multi-meter).  Check fuse between inverter and the batteries.  IF fuse is blown no DC will get to the inverter and it will not boot. 
  • If the voltage stays within the DC voltage range of the inverter.  This eliminates the possibility that an ineffective circuit from the battery is causing the issue. If the voltage is erratic, solve that problem by tracing the cause of the erratic voltage and fixing it, and then get back to the inverter. 


Connections & Reset

  • Check connections between the battery and the inverter to eliminate this issue 
  • Try to reset the inverter. 
  • Disconnect the battery, wait 30 minutes, and then reconnect. This will reboot the inverter’s processor and clear any possible error states.  Reconnect Battery and Boot Unit.  If it still does not boot there is an internal issue with the inverter. Contact our Tech Support team for further instructions. 


Power save mode 

Some perceived problems actually arise from features in the inverter like idle mode, or power save. Such features, when enabled, allow the inverter to turn off when the load is low, but can create the very real perception of a problem.  Different inverters have different means of enabling these features.  It may be easiest to check the manual to determine if your inverter has these features and how they are enabled and disabled. 



  • Battery terminals are loose.   
  • Battery cable is not sized correctly 
  • Battery terminals are corroded or rusty.   
  • Battery is weak.  
  • Battery is discharged.   
  • Battery is faulty.   
  • Battery terminals are reversed.  Connect terminals correctly.  
  • Battery is not properly charged.   
  • Battery has lost electrolyte. 


If none of this works there may be an internal issue within the inverter. 


Products covered in this article: GP-ISW-200, GP-ISW-400, GP-ISW-700, GP-ISW-1000, GP-ISW-1500, GP-ISW-2000, GP-ISW-3000, GP-ISW-4000

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