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Inverter putting out 240 volts

1

1popeman1

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May 28, 2024
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Hawaii
I have a Renogy 30 amp Rover charge controller and a 9000 watt 12 volt inverter. My question is why am I getting 240 volts at the inverters 120 volt receptacle? I discovered this when I plugged in 120 volt box fan and the fan blade began to spin way faster than normal. So, I checked the 120 volt output and got a 240 volt reading. If I connect the inverter to the battery only I get 120 volts at the inverters 120 volt receptacle.
Weird. Thanks for any insights.
 
1popeman1 said:
I have a Renogy 30 amp Rover charge controller and a 9000 watt 12 volt inverter.
Click to expand...

9000W 12V inverter.

That I have to see. That would be 750A at 12V.


1popeman1 said:
My question is why am I getting 240 volts at the inverters 120 volt receptacle? I discovered this when I plugged in 120 volt box fan and the fan blade began to spin way faster than normal. So, I checked the 120 volt output and got a 240 volt reading. If I connect the inverter to the battery only I get 120 volts at the inverters 120 volt receptacle.
Weird. Thanks for any insights.
Click to expand...
What are you using for panels? Series/parallel panels?
 
1popeman1 said:
I have a Renogy 30 amp Rover charge controller and a 9000 watt 12 volt inverter. My question is why am I getting 240 volts at the inverters 120 volt receptacle? I discovered this when I plugged in 120 volt box fan and the fan blade began to spin way faster than normal. So, I checked the 120 volt output and got a 240 volt reading. If I connect the inverter to the battery only I get 120 volts at the inverters 120 volt receptacle.
Weird. Thanks for any insights.
Click to expand...
Is it a European inverter? They do 240v over there :)
 
1popeman1 said:
I have a Renogy 30 amp Rover charge controller and a 9000 watt 12 volt inverter. My question is why am I getting 240 volts at the inverters 120 volt receptacle? I discovered this when I plugged in 120 volt box fan and the fan blade began to spin way faster than normal. So, I checked the 120 volt output and got a 240 volt reading. If I connect the inverter to the battery only I get 120 volts at the inverters 120 volt receptacle.
Weird. Thanks for any insights.
Click to expand...
If battery only produces 240v, what are you connected to when it produces 240v?

Pics?
 
1popeman1 said:
If I connect the inverter to the battery only I get 120 volts at the inverters 120 volt receptacle.
Click to expand...
Can you just leave inverter connected to battery so you only get 120 volts and forget whatever configuration that gave you the wrong voltage?
 
How are both the Rover charge controller and the battery connecting to the inverter at the same time? Are you using a bus bar? Are both DC sources wired in parallel? If your inverter takes only 12 V DC is the charge controller also set at 12 V? The charge controller might be set at 24V causing the high voltage on the AC side. It might also be a faulty Mosfet/relay(s) within the inverter.
 
Last edited:
Ampster said:
Can you just leave inverter connected to battery so you only get 120 volts and forget whatever configuration that gave you the wrong voltage?
Click to expand...

If I read it correctly, with just the battery connected (and no load), he gets 120v, but when he plugged in a fan, it jumped up to 240v. If that is the case, he could never plug anything into it. lol
 
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