Voltage drop musings [RE-wrenches] (now SolarBoost)

[jay peltz]

HI All,

As far as I know it doesn't suck more energy, but allows the inverter to run at a
higher voltage DC input which allows more watts from the panels, and at the higher
voltage, the inverter produces more power, as there is more power.

Yes it really works.

jay
peltz power

Joel Davidson wrote:

> Instead of a higher voltage bank to suck more power from the PV array, what
> about no charge controller on a net metered system with batteries? Since all the
> solar power is going to the load (local or grid) and no power is produced at
> night, the batteries should be ok. Your thoughts?
>
> "Allan Sindelar, Positive Energy, Inc." wrote:
>
> > 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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