DC sourced appliances without inverting

hillbillyhoghillbillyhog Posts: 1Registered Users, Users Awaiting Email Confirmation
Greetings. Led's , chargers, comps, etc run on DC. Anytime you change you have losses. A system starts off DC, is inverted, goes to distribution system, then is changed back to DC. Seems to me it would be simplier and more cost effective to skip the changes.  For low consumption applications? What you think?

Comments

  • Dave AngeliniDave Angelini Posts: 3,557Solar Expert ✭✭✭✭
    Define low consumption? In my case I can use as little as 2 or 3 kwh and another kwh for keeping the inverter running. I can't buy many of the appliances in DC and the ones I can are not as good of quality and do not last as long as AC appliances.
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
     http://members.sti.net/offgridsolar/
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  • 706jim706jim Posts: 185Solar Expert ✭✭✭
    Don't forget line losses too. Very few appliances can be hooked up directly to a 12 volt battery. In my summer camp, I found nearly a full volt drop with a 500ma load going through maybe 60 feet of #14 copper wire. At the time, I figured I'd need 18 volts in order to run a 7 amp DC TV. My advice: forget about 12 volt appliances and run an inverter with 120 volt appliances.
    Island cottage solar system with 1400 watts of panels, Trace DR1524 MSW inverter, Trace C40 PWM controller 8 Trojan L16's. My 25th year.
  • ThomThom Posts: 175Solar Expert ✭✭✭
    I have a small system using 12v dc and 120v ac . Charge phones , iPads , dsl , radio batteries with 12v dc. House is wired 120v ac for everything else with a 400w inverter. The inverter is off all night,  on for lights and TV for a few hours a day . Pump water , vacuum, shop tools with a generator .
    Off grid since 1984. 430w of panel, 300w suresine , 4 gc batteries 12v system, Rogue mpt3024 charge controller , air breeze windmill, Mikita 2400w generator
  • NANOcontrolNANOcontrol Posts: 39Registered Users ✭✭
    There was a news item that some major players were working on a new DC standard for the home. As said before many items work on DC. Most of those devices draw current only at the peaks of the sine wave. As these devices multiply it is becoming a problem for the utilities and inverters.  All these little wall warts also draw a couple watts each and that really adds up.  My Energy Star washer consumes 80WH a day just being off.  A home DC buss will someday be popular with the inroads of solar into the market.

    That said, there isn't a large market for DC appliances, and what voltage do you choose to make these in. I run a number of appliances on DC like water heater and dishwasher.  The dishwasher only needs about 80W of AC. The heater consumes the majority of power and that is modified to work directly on DC. My entire kitchen works only on a 400W MSW inverter with the fans disconnected.
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