Vanner [RE-wrenches]

[matthew tritt]

Lawrence,

As I remember, the Grundfos SQ is a variable speed "constant pressure"
submersible. Is that right?
If so, your customer is running an inverter with an inverter, which is a
no-no in the pumping world.
I did some investigation on this same subject in regards to the Hayes
constant pressure pumps which use a similar method of achieving a variable
speed AC pump.It was determined that, since the variable speed is achieved
with an inverter controller, it would either not work at all or would damage
the pump motor.

Hopefully I'm wrong here!

Matt
----- Original Message -----
From: "Lawrence Elliott" <larry at energyoutfitters.com>
To: <RE-wrenches at topica.com>
Sent: Friday, September 20, 2002 10:03 PM
Subject: Re: Vanner [RE-wrenches]


> Joel.
>
> I have three Vanners out now for about 10 months.
>
> 1 off grid
> 2 grid intertie with backup..
>
>
> Negatives.
> They have a problem staying on line in sell mode. Frequent shut downs
> although I suspect primarily due to the overly agressive and in some
> cases silly regs in UL1741.
> Had two that "leaked  FET smoke" for unknown reasons.
> Slow response from Vanner engineering in truly solving the grid tie
> problems although they have been working on it and now may have solved
> the problems in 48vdc models.
> The units are still not ready for prime time in off grid mode due to
> lack of generator start or ability to reliably charge from generator.
> Remote is not very intuitive and clumsy in navigating the menus and
> setups.
> My opinion is manuals need complete rewrite.
> Bad habit of display lockup when left in certain modes for lenghty
> periods.
> CD software included is better but still could use some work.
> One customer is certain that the inverter has been responsible for
> killing a second Grudfos SQ pump but I am not convinced.
> Pump installer would like it to be so.
>
>
>
> Positives
>
> In one of my installs with 3 kw wind and 2.4 kw PV in sell mode we have
> seen as high as 70% overall efficiency in passing 4kw to the grid and at
> times 6kw peaks at slightly less efficiency
> Very clean power, good surge capability in backup mode and very quiet.
> Ergonomically much easier to install than Trace SW and much cleaner
> overall without optional conduit box.
>
> Both customers are satisfied except for the fact that they will not act
> as a UPS due to fault when grid goes down and they still have too
> frequent grid drop outs per day.
> (as many as 6-7 times per day with 5 min restart times)
>
> By synthetic battery they mean a small bank of electrolytic capacitors
> that allows the inverter to deliver power when grid goes down and sun is
> shining.
> Very limited due to lack of any real capacity in the caps so any
> variations in load can easily drop inverter off line.
> I have suggested they look at 2-3 thousand farads Ultracaps to improve
> performance.
> My opinion is that it has limited usefulness as SunLynx product and has
> a hefty price tag.
>
>
> Refuse to sell additional units until bugs are worked out.
>
> Larry Elliott
>
>
>
>
>
>
> > Vanner advertises the Sunlynx SLX as a non-battery "system" with a
> > "synthetic battery." Anyone using this device? What is a synthetic
> > battery?
> >
>
> >
> >
>
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