no batteries on grid tie [RE-wrenches]

Fri Aug 8 19:31:59 PDT 2003

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0 amp hours.

When correctly installed, set, and operating in utility interactive
Sell Mode, the SW inverter will float just fine with a battery of
any capacity, including 0 amp hours [no battery]. On the other
side of that equation, it's hard for me to conceive of a realistic
scenario where the battery connected to an SW could or would
fry due to over current. If the size and capacity are "that low",
and the inverter load is heavy enough to "overcurrent" the pack,
the battery will have so little capacity, the inverter will trip out
from undervoltage (discharged battery or excess voltage drop
through battery) before a safety problem develops. On the
recharging end, the charge currents could be too aggressive.

/wk

At 05:07 PM 8/7/03 -0700, you wrote:
>Daryl,
>Trace use to make a non-battery SW inverter with the big blue capacitor
>(rating?). I use 4 each 12 V Johnson Controls 85 AH sealed batteries in
>series with my SW4048. If the batteries are just sitting there not being
>used (no off-grid, no UPS), there is no need a big battery bank. I haven't
>tried it, but I can't see why 4 each 12 V 20 AH motorcycle batteries
>wouldn't also work. What's the smallest 24 or 48 V battery bank out there on
>a grid-tie SW inverter?
>Best regards,
>Joel Davidson
>
>Daryl Thayer wrote:
>
> > Thanks Matt
> > My interest in sealed is low hydrogen production for
> > indoor battery mounting, and low maintenance.
> >
> > I have been told that the battery size does matter and
> > another system I have designed used a 400 AH at 48
> > volts from Xantrex information.  They told me I needed
> > to be that large because of the pulsed nature of the
> > current drawn by the SW.
> >
> > Daryl
> >
> > --- Matt Tritt <solarone at charter.net> wrote:
> > > Daryl,
> > >
> > > If your customer intends to be connected to the
> > > grid, you have to use
> > > equipment that's been approved for the job, which
> > > eliminates
> > > experimentation with capacitors and other home brew
> > > recipes. In essence,
> > > a battery is a capacitor when used the way you plan.
> > >
> > > A Xantrex SW with a small battery, say 100 AH or so,
> > > should do just
> > > fine. Plus they will have a little bit of reserve
> > > power for outages if
> > > you also install a transfer switch in the mix. Are
> > > you interested in
> > > sealed batteries because of the maintenance factor?
> > >
> > > Matt T
> > >
> > > -----Original Message-----
> > > From: Daryl Thayer [mailto:daryl_solar at yahoo.com]
> > > Sent: Thursday, August 07, 2003 5:56 AM
> > > To: RE-wrenches at topica.com
> > > Subject: RE: no batteries on grid tie [RE-wrenches]
> > >
> > > hello to all again
> > >
> > > Hello to all
> > > I have a customer who wants a Bergey 1kW and grid
> > > tie.
> > >  I have mostly done stand-alone and grid-tie with
> > > UPS
> > > on a 24 or 48 volt battery set.  This Customer does
> > > not want batteries.
> > >
> > > Can I use large capacitors?  Has anyone tried this?
> > > How large would the capacitors have to be?  Can I
> > > use
> > > a FX series or other inverter?   It would seem the
> > > faster the chop frequency of the inverter the
> > > smaller
> > > the capacitors.  I think the SW uses a slower chop
> > > than the FX ? so the FX would work better?
> > >
> > > If I am forced to use a battery, sealed AGM how
> > > small
> > > could it be?  (I am concerned here myself because
> > > the
> > > wind generator charge controller is not like an MX
> > > 60
> > > with precise control.)
> > >
> > > Thanks again for all the help on my past questions.
> > >
> > >
> > > Daryl
> > > daryl_solar at yahoo.com
> > >
> > >
> > >
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