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Jimbee

New York

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Posted: 03/14/20 08:43am Link  |  Quote  |  Print  |  Notify Moderator

Hey All,

Silly question regarding power inverter battery consumption. If I'm using my portable 400 watt power inverter to power a 75 watt TV, does the inverter draw the full rated wattage at all times or will it only draw the amount of power it needs to run the TV? I have 300 watts of solar to re-charge the batteries during the day, but it would be nice to watch TV at night for a few hours without worrying about draining the batteries too much.

Thanks!

jkwilson

Indiana

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Posted: 03/14/20 08:51am Link  |  Quote  |  Print  |  Notify Moderator

Input power consumed roughly tracks output power being delivered. Depending on the particular inverter, there is some inefficiency. Up to about 15%, so you’d expect maybe 85W being consumed running a 75W load. There is also a small idle demand, probably about 100mA or a Watt to a Watt and a half.


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Jimbee

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Posted: 03/14/20 08:59am Link  |  Quote  |  Print  |  Notify Moderator

Many Thanks,
I was hoping that the load dictated the power consumption rather than the inverter pulling maximum wattage all the time whether I used it or not!

Jimbee

time2roll

Southern California

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Posted: 03/14/20 10:03am Link  |  Quote  |  Print  |  Notify Moderator

The inverter will add about 20% to the tv load.


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pianotuna

Regina, SK, Canada

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Posted: 03/14/20 10:21am Link  |  Quote  |  Print  |  Notify Moderator

Divide wattage of device by 10 to know the battery draw in amps.

75 watts = 7.5 amps.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Lwiddis

Mono Basin National Forest Scenic Area

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Posted: 03/14/20 10:50am Link  |  Quote  |  Print  |  Notify Moderator

“but it would be nice to watch TV at night for a few hours without worrying about draining the batteries too much”

Do you have an adequate battery bank for your power needs? Determine this by an “what I want to use” energy survey. Once the battery power needed is pegged you can compute if 300 solar watts is sufficient for recharging.


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