Page 1 of 2 1 2 LastLast
Results 1 to 20 of 40
  1. #1
    Join Date
    Apr 2012
    Location
    Jhb
    Age
    75
    Posts
    608
    Thanked: 165

    Default TV and modified or pure sine wave

    I want to run a 32inch (80cm) TV and internet (WiFi router) during load shedding. Maybe also a laptop.
    Considering a 1000W or 1500W inverter and battery.
    My question is: Must the inverter be a pure sine wave or can it be a modified sine wave?
    Thanks for any advice.

  2. #2
    Join Date
    Jun 2011
    Location
    Kempton Park
    Age
    66
    Posts
    1,858
    Thanked: 494

    Default Re: TV and modified or pure sine wave

    Quote Originally Posted by RonS View Post
    I want to run a 32inch (80cm) TV and internet (WiFi router) during load shedding. Maybe also a laptop.
    Considering a 1000W or 1500W inverter and battery.
    My question is: Must the inverter be a pure sine wave or can it be a modified sine wave?
    Thanks for any advice.
    My 65"runs on a 350w modified wave
    Motors need pure sine wave.
    Fortuner D4D
    Hilux 2.7 4x4 Raider.
    Sp Tourer

  3. #3
    Join Date
    Apr 2012
    Location
    Jhb
    Age
    75
    Posts
    608
    Thanked: 165

    Default Re: TV and modified or pure sine wave

    Thanks Robbief.
    What about a laptop and internet Wifi router?
    Do they need pure sine wave?

  4. #4
    Join Date
    Sep 2006
    Location
    Gaborone, Botswana
    Age
    58
    Posts
    5,525
    Thanked: 1658

    Default Re: TV and modified or pure sine wave

    I'm running TV, decoder, router, chargers (Laptop + Tablet + Phone) off a Mecer 2400VA inverter. No problem

    On hot days even a cheap fan. Hy knor so bietjie maar hy werk.
    Kobus

  5. The Following 2 Users Say Thank You to KobusDJ For This Useful Post:


  6. #5
    Join Date
    Apr 2012
    Location
    Jhb
    Age
    75
    Posts
    608
    Thanked: 165

    Default Re: TV and modified or pure sine wave

    Thanks Kobus, is it a pure sine wave or modified sine wave?
    A pure sine wave is about 2 or 3 times more expensive than a modified sine wave. So I am trying to establish if I need to buy the pure sine wave or not especially for the Wifi and laptop.

  7. #6
    Join Date
    May 2009
    Location
    Hillcrest
    Age
    64
    Posts
    19,431
    Thanked: 8417

    Default Re: TV and modified or pure sine wave

    Quote Originally Posted by KobusDJ View Post
    I'm running TV, decoder, router, chargers (Laptop + Tablet + Phone) off a Mecer 2400VA inverter. No problem

    On hot days even a cheap fan. Hy knor so bietjie maar hy werk.
    Herein lies the problem. "Hy knor" is something you can hear caused by poor quality voltage.

    Although you cant hear it, "hy knor" is exactly the electrical stress the electronic components in the power supply of your appliance is being subjected to.

    Depending on the specific circumstances - which Inverter, the appliance, how fully loaded is it, the direction of the wind..... You can be lucky or unlucky. 99% of the time you get lucky.

    For the technically minded. The current in the components will be Ip = dVdT. With a square wave the instantaneous currents can be insane.
    Cheers

    ZS5KAD
    3 Land Rover V8's
    NA - TwinTurbo - SuperCharged
    A V6 and an inline 4

    If you fly or drive to an anti-Fracking meeting, you have no business being there and you wont get my ear......

  8. The Following 2 Users Say Thank You to Fluffy For This Useful Post:


  9. #7
    Join Date
    Oct 2011
    Location
    krugersdorp
    Age
    47
    Posts
    1,476
    Thanked: 444

    Default Re: TV and modified or pure sine wave

    during lockdown last year wife was working from home.
    and if we get load shedding
    everything was on modified sine(cheap chinese one)without problem.
    laptops
    routers
    wifi thingies
    decoder
    tv.....

    105ah battery run any 4 above for 4 hours easy
    after 4 hours potential is down only 0.8V

    i can get exact inverter details tomorrow if interested.

  10. The Following User Says Thank You to jadranko For This Useful Post:


  11. #8
    Join Date
    Jan 2012
    Location
    King Williams Town
    Age
    53
    Posts
    8,189
    Thanked: 1994

    Default Re: TV and modified or pure sine wave

    Make sure laptop is charged before loadshedding, then it won't be a big draw on inverter and battery. I have run TV, decoder, DVD and Playstation 3 off my 400w modified sine wave inverter for over 5 hrs.
    Isuzu STD 2.5d 2x4 rear diffy lock
    2x spotlight,2x fog lights
    215/80/R15c tyres
    1 x great humourous driver
    GPS,Bluetooth
    Eagle eye dash cam --stolen ..bought another one
    snorkel soon
    Craig
    I DON'T LIVE IN AFRICA,AFRICA LIVES IN ME- Kyle my son

  12. The Following User Says Thank You to hunter26 For This Useful Post:


  13. #9
    Join Date
    Dec 2014
    Location
    Kempton Park
    Age
    51
    Posts
    88
    Thanked: 1230

    Default Re: TV and modified or pure sine wave

    I bought a TrailBoss 1000w modified sine- wave inverter about 2 years ago to power a 65" LG, another smaller tv, decoder, wifi, etc.

    The humming/buzzing from the 65" LG made me uncomfortable especially since the slightly smaller tv did not. Besides that it worked well.

    I landed up getting the Changi 3000w pure sine just before lockdown, works brilliantly no buzz from the 65".

  14. The Following 3 Users Say Thank You to caesarcp For This Useful Post:


  15. #10
    Join Date
    Mar 2010
    Location
    Cape Town - RSA
    Age
    36
    Posts
    2,950
    Thanked: 484

    Default Re: TV and modified or pure sine wave

    My Mecer Modified Sine Wave works, but if I was to do it all again, I think I would spend the bit extra and go pure sine wave. But there was very few options at the time.

    From what I understand, all of the are actually modified sine wave, the "pure" ones are just better versions.
    2007 Jeep Grand Cherokee 3.0 CRD Overland - GDE Eco Tune + 2" Lift on 265/70/17 BFG KO2's
    2017 Venter Savuti + Tentco Jnr, Dometic CF50 Fridge + Snomaster Battery Box
    --
    Ex - 2005 Cherokee CRD

  16. The Following 2 Users Say Thank You to Quiksilver For This Useful Post:


  17. #11
    Join Date
    Oct 2013
    Location
    Centurion
    Age
    64
    Posts
    2,571
    Thanked: 1035

    Default Re: TV and modified or pure sine wave

    Quote Originally Posted by Quiksilver View Post
    My Mecer Modified Sine Wave works, but if I was to do it all again, I think I would spend the bit extra and go pure sine wave. But there was very few options at the time.

    From what I understand, all of the are actually modified sine wave, the "pure" ones are just better versions.
    @RonS At R2000 for the Changi 1500/3000W pure sine wave the increase in price could be less than the 2 to 3 times more. Just a pity there are not many pure sine UPSes around like the Mecer 720/1400W models.

    This is what the current range of China pure sines looks like.
    If this is a pure modified sine then so be it.
    Attached Images Attached Images  
    Last edited by ekkekan; 2021/05/28 at 07:19 PM.

  18. The Following 4 Users Say Thank You to ekkekan For This Useful Post:


  19. #12
    Join Date
    Mar 2007
    Location
    Harties Boet
    Age
    38
    Posts
    1,986
    Thanked: 1560

    Default Re: TV and modified or pure sine wave

    Quote Originally Posted by KobusDJ View Post
    I'm running TV, decoder, router, chargers (Laptop + Tablet + Phone) off a Mecer 2400VA inverter. No problem

    On hot days even a cheap fan. Hy knor so bietjie maar hy werk.
    I have exactly the same setup, but have a lamp and long led strip connected as well as the above. Edit: and a hifi that has a little fan in it.
    the 2400 mecer is a modified sine. I’ve had this for three years. Everything still working fine.

    ive connected a fan once before but man it complained about it.
    Last edited by Graham; 2021/05/28 at 07:53 PM.
    Graham Robertson
    Nissan Patrol 4.8

  20. The Following User Says Thank You to Graham For This Useful Post:


  21. #13
    Join Date
    Apr 2012
    Location
    Jhb
    Age
    75
    Posts
    608
    Thanked: 165

    Default Re: TV and modified or pure sine wave

    Quote Originally Posted by jadranko View Post
    during lockdown last year wife was working from home.
    and if we get load shedding
    everything was on modified sine(cheap chinese one)without problem.
    laptops
    routers
    wifi thingies
    decoder
    tv.....

    105ah battery run any 4 above for 4 hours easy
    after 4 hours potential is down only 0.8V

    i can get exact inverter details tomorrow if interested.
    yes I would be very interested in the inverter details and where to buy one. Thanks.

  22. #14
    Join Date
    Apr 2012
    Location
    Jhb
    Age
    75
    Posts
    608
    Thanked: 165

    Default Re: TV and modified or pure sine wave

    Quote Originally Posted by ekkekan View Post
    @RonS At R2000 for the Changi 1500/3000W pure sine wave the increase in price could be less than the 2 to 3 times more. Just a pity there are not many pure sine UPSes around like the Mecer 720/1400W models.

    This is what the current range of China pure sines looks like.
    If this is a pure modified sine then so be it.
    Where can I buy a mercer? Had a look around and cant find one.

  23. #15
    Join Date
    Oct 2013
    Location
    Centurion
    Age
    64
    Posts
    2,571
    Thanked: 1035

    Default Re: TV and modified or pure sine wave

    Quote Originally Posted by RonS View Post
    Where can I buy a mercer? Had a look around and cant find one.
    Geewiz. Co. Za. They have stock. Also with trolley at Makro or Leroy Merlin. If you Google Mecer 1400w inverter you will find many sellers.

  24. The Following User Says Thank You to ekkekan For This Useful Post:


  25. #16
    Join Date
    Jan 2013
    Location
    Centurion
    Age
    33
    Posts
    179
    Thanked: 101

    Default Re: TV and modified or pure sine wave

    A link to the Mercer
    Mercer IVR-2400LBKS

    I used this with a 105 gel battery for a long time. Bonus is that it charges the battery and auto switches over during power outage and switches back when power returns like a UPS

    Had computer and wifi on the inverter full time so I don't get internet/pc down during load shedding starting and then run a cable to TV if needed
    Last edited by PsyPhin; 2021/05/28 at 10:06 PM.
    Dont take anything I say as actual advice or fact. I dont.

    Haval H9 2.0T AWD
    Ex 2019 Ranger DC XLT Manual 4x4
    Ex 2017 Ranger DC XL Auto 4x4

  26. The Following User Says Thank You to PsyPhin For This Useful Post:


  27. #17
    Join Date
    Sep 2006
    Location
    Gaborone, Botswana
    Age
    58
    Posts
    5,525
    Thanked: 1658

    Default Re: TV and modified or pure sine wave

    Quote Originally Posted by Fluffy View Post
    Herein lies the problem. "Hy knor" is something you can hear caused by poor quality voltage.

    Although you cant hear it, "hy knor" is exactly the electrical stress the electronic components in the power supply of your appliance is being subjected to.....
    Thanks Fluffy.

    I'm aware that the motor is stressed because of the poor quality voltage.

    What I'm saying is that the cheap (P150) little fan survives. It has been sitting there for 3 years and it is running of the inverter with every outage. Up to 6 hours in one shot.

    I'm not running any other non compatible equipment from this modified sine wave inverter. I'm also not advising other people to do so.

    .
    Last edited by KobusDJ; 2021/05/29 at 07:01 AM.
    Kobus

  28. #18
    Join Date
    Aug 2008
    Location
    Rangeview Krugersdorp
    Age
    71
    Posts
    6,900
    Thanked: 1659

    Default Re: TV and modified or pure sine wave

    Stick to Geewiz for top notch prices and exchange policy.
    There is no task too simple for some people to complicate !



    Ford Figo 2016

  29. The Following User Says Thank You to duncang For This Useful Post:


  30. #19
    Join Date
    Jul 2010
    Location
    Pinetown
    Age
    72
    Posts
    2,747
    Thanked: 2588

    Default Re: TV and modified or pure sine wave

    In many years of travelling with the NL fridge, CPAP etc. and more recently with the TV and desktop computer as well as routers, WiFi and other running off an Omnipower modified sine wave 1 000 W inverter everything has worked just fine. (Also an el-cheapo).
    I do however run the power from the inverter through good quality anti-surge plugs. Yes more than one.
    One on the incoming power and one each on each item or multiplug.
    I last replaced the INVERTER several years ago and that was most likely due to it having worked in very unfriendly, HOT and very dusty conditions in the back of the 4x4 for years.
    Now set up in my workshop at home as a backup power source the cooling fan in the inverter hardly ever comes on.
    In the vehicle it was running almost full time.
    I guess the pure sine wave is better though and maybe then you would not need the surge protection ?
    Peter Hutchison
    Answering the call of the wild is just so much beter than answering the telephone.
    [B][SIZE=2][FONT=Calibri][SIZE=2][B]ISUZU KB 280 DT LE
    Modified Glider Hunter trailer fitted with RTT.
    Platkar = Chevy Spark 1.2

  31. The Following 2 Users Say Thank You to Peter1949 For This Useful Post:


  32. #20
    Join Date
    Sep 2008
    Location
    Vanderbijlpark
    Age
    52
    Posts
    1,956
    Thanked: 274

    Default Re: TV and modified or pure sine wave

    Quote Originally Posted by Peter1949 View Post
    I do however run the power from the inverter through good quality anti-surge plugs. Yes more than one. One on the incoming power and one each on each item or multiplug. I guess the pure sine wave is better though and maybe then you would not need the surge protection ?
    IMHO surge protection on the output of a modified sinewave inverter won't really make any difference or improve the quality of the output at all. The problem is the basic shape of the waveform, not an occurrence of spikes. Having the protection on the input from the mains supply does make sense.
    Last edited by An3s; 2021/06/01 at 01:46 PM.
    ZS6VL


  33. The Following 3 Users Say Thank You to An3s For This Useful Post:


Page 1 of 2 1 2 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •