The biggest thing to do is to reduce the power needed , as to heating and
cooling gshp is the way to fly , and I'm in progress on that and it will
likely be linuxcnc controlled. As to 12 volt only temporary and mobile
systems should be 12 volt, that's why I'm at 48 and would go higher ify in
Stock equipment would allow, it's also why I will be running a 22 horse
Lister diesel.
I agree going off grid is hard , I have been at it 5 years. And can't
overstate reduction of necessary power is absolutely key.

On Sun, Apr 15, 2018, 22:15 Chris Albertson <>

> The O.P. wants to run his central A/C off this.
> This means a CONTINOUS draw of 350 amps from a 12 volt battery.
> Think about that 350 amps.   This is going to be one friggin large bank of
> batteries and as much as I would like to say "go with LiPo" or some other
> exotic type. the COST would be horrific.  As it is a battery this size is
> going to cost between $15K and $20K using best value lead acid.
> Going off grid is really hard and EXPENSIVE.  But today the best solution
> is not off-grid.  It is a "grid tie" system.   This works because you don't
> need the $20,000 rack of batteries.   What you do is run off the wind and
> solar when it is available and off the grid power when wind/solar is not
> available.    The grid acts just like a battery except it is free.   When
> you have excess power the local utility buys it from you.   The you buy it
> back at night when the solar cells don't work.   The effct is the same as
> owning a battery but you save 20 grand.
> OK if you want power during a utility power failure you do need a battery
> but you don't need a big one because you just live without the air
> conditioning so you do fine with 10% size battery bank
> Of if you are really worried about power failure buy a Toyota Prius.  A
> Prius has a gas engine and a really big generator that can power your
> entire house if you instal a 110VAC inverter.   A Prius gas tank is
> something like 10 gallons and will run your house for a couple days.  The
> gas engine come on and off as required to top off the battery.    The Prius
> has a $9,000 battery that works well for powering a house for a day or so
> or for general tail gaiting.  A Prius is a LOT more powerful than a
> portable Honda generator.  I have one of these and the MPG rating is
> conservative at 50MPG.  It works well for doing to/from work too.
> On Sun, Apr 15, 2018 at 4:50 PM, jeremy youngs <>
> wrote:
> > >
> > > In the midst of this, I would stay away from lead acid , you can find
> ev
> > > take out batteries reasonable on fleabay, I recommend nimh if you can
> > find
> > > them as they require far less control than lipo . I have a xantrex 2 k
> > > modified sine inverter that works very well and has a 100 amp 3 stage
> > > charger that is top. I also have several surplussed apc backup
> > > uninterruptible power supplies that make nice clean power, I have
> several
> > > 3k and a few 5k supplies. 2k in solar with xantrex pwm charge control.
> I
> > > will upgrade to a Morningstar mppt in the future. I also have a Lister
> > > diesel I wish to use to drive a 555 jho alternator and regulated to 48
> v
> > .
> > > I have the stuff amassed and several components test but not
> installed, I
> > > try to gather a heap of parts then build. I will send a link to the
> > Arduino
> > > based generator control if you are interested.
> > ------------------------------------------------------------
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> >
> >
> --
> Chris Albertson
> Redondo Beach, California
> ------------------------------------------------------------------------------
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