Voltage drop musings [RE-wrenches]

[Lynne A Carter]

Allan,
Did you hear back from Bill Brooks?  Is the system working?????????

Lyn at solarvillage.com
Solar Village Institute inc.
PO Box 14
Saxapahaw, NC  27340
Tel. 336-376-9530
Fax. 336-376-1809
www.solarvillage.com

----- Original Message -----
From: Allan Sindelar, Positive Energy, Inc. <allan at positiveenergysolar.com>
To: <RE-wrenches at topica.com>
Sent: Wednesday, May 02, 2001 10:34 PM
Subject: Re: Voltage drop musings [RE-wrenches]


> Jay and wrenches,
> What a mindblowing idea. You are suggesting a 54 or 56 volt DC battery
bank,
> used with SW5548 and 4048 inverters? Have you successfully done it? Does
it
> work well in all other aspects, besides just MPP matching for sell-back?
Can
> it work in gird-backup stand-alone? Can you EQ the batteries occasionally?
> Is DC overvoltage a problem?
> I'm doing a big 48V system (posted Qs about it here some months ago);
still
> finalizing design. Total code-compliant. We're using a Pulse 500 for the
DC
> to get UL listing, so we have to use their controllers, rather than
> not-yet-listed SB3048s on about 4kW of tracked array. One 5548 for house
> loads; one 4048 (unstacked; all 230VAC loads will be grid-only) for pumps
> and mechanical loads, and 3-4kW of Exeltech MX series for A/V/data loads.
> Sell-back is NOT planned or requested by customer, but I'd like to design
> for it to be added later. With 2V industrial cells, should I consider a
> higher-than-48 nominal system voltage? What are pros, cons, and things to
> watch out for?
> Thanks for advice.
> Allan at PosEn
>
> ----- Original Message -----
> From: "jay peltz" <jay at asis.com>
> > One way is to increase the number of batteries in the system.  This
> increases the
> > operating voltage ( more watts) without the need for a MPPT controller.
> 48v systems
> > are pretty easy as you add another 6v ( if you are using 6v batteries.
If
> you are
> > using 2v cells, then maybe 8v would work better?) battery to the system,
> works
> > pretty slick- cell voltage is lower, overall voltage is higher= more
watts
> to the
> > grid.
> >
> > And yes many people are using the MPPT controllers to get around this
> problem called
> > "batteries".
>
>
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