Tv inverter

mountainmanmountainman Registered Users Posts: 139 ✭✭
I have a 32" led tv that uses 22 watts on kill a watt meter. Currently I'm using a 12 volt 300 watt inverter. .7 amps or 8.4 watts on standby. Wouldn't it be more efficient to use say a 80 watt inverter with a .15 amp standby. Some of the inverter specs ive looked at say 90% efficiency and 95% at 1/3 load? Is my math right 120 volts at 22 watts at 95%= 23.1+1.8=24.9 watts on 12 volts?
Blue ridge mts. Renogy 400 watts manual tracking . Epever mppt 30. 2 GC 208 ahr. 300 watt psw inverter. 2 kw genny. Iota 45.

Comments

  • EstragonEstragon Registered Users Posts: 3,021 ✭✭✭✭✭
    Is the 80w a pure sine wave unit?
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
  • mountainmanmountainman Registered Users Posts: 139 ✭✭
    No modified 100 watt is the lowest pure sine I can find aims .7 idle samlex 120 22 watts idle.does anyone make a small pure sine with low idle?
    Blue ridge mts. Renogy 400 watts manual tracking . Epever mppt 30. 2 GC 208 ahr. 300 watt psw inverter. 2 kw genny. Iota 45.
  • BB.BB. Super Moderators, Administrators Posts: 28,155 admin
    An inverter with remote on/off is really nice in these cases--Turning off Inverter saves a fair amount of energy (a pain if you have satellite or DVR running from inverter). Some TVs take "longer to boot" if started from a cold shutdown.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • mountainmanmountainman Registered Users Posts: 139 ✭✭
    I have just a tv on antenna my woman turns it on st 8am when she gets up and I turn it off at 10 pm after she's asleep yea 14 hrs thats why I'm thinking of modified inverter.the tv is from craigslist $50 $20 for a samlex. not alot to lose...
    Blue ridge mts. Renogy 400 watts manual tracking . Epever mppt 30. 2 GC 208 ahr. 300 watt psw inverter. 2 kw genny. Iota 45.
  • NANOcontrolNANOcontrol Registered Users Posts: 87 ✭✭
    I found that a MSW 300W inverter was more efficient than a smaller one at low power.  The transformers are too small on the sub 100W units. The big current use are the fans.  I disconnect mine as they account for about a watt each.  At that power they dont need cooling.  I have a little 100W Rdgid and that won't even power a 30W device. It goes into shutdown just charging the capacitors in the power pack.
  • mountainmanmountainman Registered Users Posts: 139 ✭✭
    So say a 210 msw compared to a 80 watt both has a .15 no load 90% efficiency. Clip the fan and the 210 will use less watts? The smallest pure sine I've found is a 120 .5 idle 90%.Do you add in idle when it is under load also.?
    Blue ridge mts. Renogy 400 watts manual tracking . Epever mppt 30. 2 GC 208 ahr. 300 watt psw inverter. 2 kw genny. Iota 45.
  • NANOcontrolNANOcontrol Registered Users Posts: 87 ✭✭
    Some inverters switch on the fan only when they get hot, some run all the time.
  • EstragonEstragon Registered Users Posts: 3,021 ✭✭✭✭✭
    Just a thought, but maybe a small msw needs to run a fan to get rid of the heat generated because it's running an "ugly" (to it) load. Add on a fan to get rid of heat in the design. Done. So we have the fan, so why bother with whether to turn it on. Costs money, adds problems.

    User clips fan wire to save power = no warranty. What's not to like?
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
  • mountainmanmountainman Registered Users Posts: 139 ✭✭
    I found one small msw with a copper heat sink no fan?
    Blue ridge mts. Renogy 400 watts manual tracking . Epever mppt 30. 2 GC 208 ahr. 300 watt psw inverter. 2 kw genny. Iota 45.
  • EstragonEstragon Registered Users Posts: 3,021 ✭✭✭✭✭
    A heat sink takes no power to run (in the sense it isn't creating more heat moving heat). Try it and see? Worst case, keep it away from flammables until you know it works?
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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