Grid-tie with battteryless backup [RE-wrenches]

[Kirpal Khalsa]

I looked into the Ecojoule inverter as a customer had one and was
looking to replace it with a larger model.....After contacting the
company and discussing the system with the customer the Ecojoule 2500
inverter was indeed a battery less inverter but primarily designed to
power an AC water pump directly off an array with out
batteries.....not to feed power back to the grid.....The customer had
the unit installed and running for a couple years and then his pump
clogged.... the inverter was still working.....
I contacted the company as they apparently weren't going thru
distribution and checked into pricing....they were quite expensive
even wholesale.......
>From what I could tell they do not have an anti islanding mechanism
and so they were not rated for utility inter-tie but they are designed
to provide AC power direct from an array with no batteries......

Cheers,
-- 
Sunny Regards,
Kirpal Khalsa
NABCEP Certified Solar PV Installer TM
Renewable Energy Systems


On Tue, May 13, 2008 at 6:30 AM, Ezra Auerbach, DragonSun Consulting
<ezra at lasqueti.net> wrote:
>
>
>  I think that some claim to provide battery less back up. I recall a few
> tries at that objective, a few years ago an inverter manufacturer brought
> out a large capacitor which was going to replace batteries in grid tie back
> up. None of them have apparently figured out how to account for changing
> insolation. From my point of view it seems a pretty dicey way to provide
> power stability, I don't think that you can beat batteries (yet).
>
>  Cheers,
>
>  Ezra
>
>  Ezra Auerbach
>  DragonSun Consulting
>  Lasqueti Island, B.C. V0R 2J0
>
>  ezra at lincsat.com
>  250 333 8650
>
>  On 4-May-08, at 7:36 PM, Mick Abraham wrote:
>
>
> >
> >
> > Kurt Albershardt wrote:
> >
> > >
> > > Do any of the batteryless grid-tie inverter systems allow for
> > > disconnected operation when the grid is down?  Automatic
> > > disconnect/re-connect would be ideal, but some sort of MTS arrangement
> > > (double throw disconnect switch with aux contacts?) might also be
> > > workable.
> > >
> > >
> > Mick says: Check out the EcoJoule 2500:
> >
> > http://ecopowercorp.com/
> >
> > I have no "hands on" with this but they claim operability without
> > batteries and without the grid. The parent company is "Advanced Energy
> > Conversion" in New York. Did I hear bad things about inverters under
> > that brand in prior years?
> >
> > Mick Abraham, Proprietor
> > www.abrahamsolar.com
> >
> >
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