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I believe a motor can draw 2 to 3 times its 'normal' load
while starting. What you might be running into, though, is
that by applying a sudden, large load your batteries might
drop below the threshold voltage of the inverter, causing
it to shut off. Do you have a multimeter that will retain
min/max readings? If so, hook it up and plug in the 'frige
and see what happens.
I *think* you might be able to hook a large capacitor in
line with the load to absorb some of the startup load, but
really wouldn't hazard a guess as to how to size it, or
even how to hook it up.
-Rob
--- "Rich, Michael" <> wrote:
> I like the idea of multiple small inverters and that
> might be my problem. I
> wanted to run the small (4.2cubic feet) fridge off the
> inverter. We figured
> earlier the fridge draws about 4.5 amps. However this
> fridge over powers my
> 500/800 peak watt and 600/1000 peak watt inverter when it
> is plugged in. So
> do I assume it draws far more when it is powered on. Is
> there a number for
> minimum watt inverter I need to power this fridge or is
> there a way to hook
> both inverters up to get more capacity? Mike
>
> -----Original Message-----
> From: R Hepler [mailto:]
> Sent: Thursday, March 01, 2001 5:20 PM
> To: Live Aboard
> Subject: Re: lv-ab: inverters
>
>
> I *think* the small (<300w) inverters are actually in the
> 90's, efficiency-wise. If it is the difference between a
> $300 printer (was that a canon that was mentioned at that
> price?) at 12v and a $40 printer and $40 inverter at 120v
> (and $30 blender and $190 in rum), I know which way I'd
> spend my $300 >;-P (hic)
>
> -Rob
>
> --- Jim Lynch <> wrote:
> > Assuming you've got the opion of running the printer
> from
> > either 12 VDC
> > or 110VAC and the efficiency of the device is the same
> in
> > either mode,
> > then the quick answer is yes. The practical answer is
> > that it depends
> > on the inverter. Many of the inverters today are
> better
> > than 80%
> > efficient so the answer remains yes, but not a lot.
> >
> > Jim.
> >
> > > Roger Crawford wrote:
> > >
> > > Rob tcbH mentioned using an ac printer and hooking it
> > up to a small
> > > inverter to change the dc to AC. Does this method
> suck
> > the batteries
> > > down faster than a 12 volt appliance?
> > >
> > > Roger
>
>
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