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Hi my name is Robert...
When you say plugged in are you using any adapters or extension cords on the main cord?
The voltage should not be dropping off to much if you are plugged in with NO adapters or cords, sometimes if you step down and plug into a standard 110 outlet it can cause issues. So this sounds like the converter is not working properly. When you are plugged into the 30 or 50 amp service you should see around 13 volts if the converter is doing it's job. IF the voltage is 9 then it is to low. IF you can get me the make and model of the converter it should help, I can send you some troubleshooting. Also I might have the batteries load tested if you just purchased this, if the batteries were in poor condition then they might not accept a charge from the converter. Make sure all the cables are clean and tight. Most auto parts stores will load test them for free..... Robert
Let me know if you need more help, follow ups are included and I am around daily... Robert
That might be an inverter, do you have a model number on it?
That is an inverter and I am not so sure that one will charge the battery so that would mean you would also have a power converter, the power converter will take the incoming AC voltage and charge the battery. The inverter will take the DC battery voltage and make AC voltage when you are unplugged from power. Can you tell me what it says on your main fuse/breaker panel? The converter will be part of the breaker panel OR stand alone and plug into an outlet. On the stand alone style they are normally close to the breaker panel, under the stove fridge etc.
does it look like the picture below? OR similar.
Yup that is it, it will charge the batteries when you are plugged in, click HERE for some troubleshooting. IF the incoming AC voltage is good you should have close to 14 volts, if it is dropping to 9 volts at the converter then it is bad and would need to be replaced. Robert
Hi was just checking in to see if my answer helped? IF you have more questions or concerns please feel free to contact me...
Have a safe and Happy New Year! Robert