Mr

[Guest Ted grener]

I bought an inverter for 110v to Dc 15 amp for my 20 watt mobile. When I plugged it in it shows 12.9 volts. Will this lower my output as the vehicle outputs 13.8 volt. 

[SteveShannon]

3 minutes ago, Guest Ted grener said:

I bought an inverter for 110v to Dc 15 amp for my 20 watt mobile. When I plugged it in it shows 12.9 volts. Will this lower my output as the vehicle outputs 13.8 volt. 

It really depends on the design. It probably will still be enough. Just hook it up and see. 

[amaff]

Will it lower your output power? 

In my experience, it often does.

Will it lower it enough to matter?

In my experience, no.

[WRUE951]

1 hour ago, Guest Ted grener said:

I bought an inverter for 110v to Dc 15 amp for my 20 watt mobile. When I plugged it in it shows 12.9 volts. Will this lower my output as the vehicle outputs 13.8 volt. 

how big is the inverter

 

[SteveShannon]

1 hour ago, Guest Ted grener said:

I bought an inverter for 110v to Dc 15 amp for my 20 watt mobile. When I plugged it in it shows 12.9 volts. Will this lower my output as the vehicle outputs 13.8 volt. 

The more I think about this I think maybe you’re not really talking about an inverter but rather a 15 amp switch mode power supply, 110 volts AC input and 12.9 volt dc output. Is that correct?

[WRUE951]

10 minutes ago, SteveShannon said:

The more I think about this I think maybe you’re not really talking about an inverter but rather a switch mode power supply, 110 volts AC input and 12.9 volt dc output. Is that correct?

yup.. could be a chrger too.  Some people with big linears use chargers for whatever reason.   

[LeoG]

It's a power supply, not an inverter.  An inverter takes DC and changes it to AC.  Good chance the power output will be a bit lower.  Probably won't matter that much though.  Unless your normal signal is going through obstacles such as trees.