no batteries on grid tie [RE-wrenches]

[Joel Davidson]

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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