Voltage drop musings [RE-wrenches]

[Joel Davidson]

Is the SB3048 a current boosting battery charger or a PV array max power point
device? I have 8 each 4-module series strings of Siemens SP70 modules feeding
into a C40 and then into a net metered SW4048 with a small backup battery bank.
The batteries just sit there (pulling the inverter off max power point), but the
net metered load is the grid so it can take all the PV I produce. Right now
(4:30PM) my C40 digital meter says 16 amps at 54 volts equals 864 watts. Will I
produce 19.2 amps at 54 volts or 19.2 amps at 45 volts with the SB3048?

"Allan Sindelar, Positive Energy, Inc." wrote:

> Joel,
> Probably not, but it depends on your motivation. A boost of 20% (common) on
> 5 rated amps is one additional amp. Is that worth the $400 expense to you? I
> would only if I knew I would be adding array down the line. Add more array,
> and the benefits become more cost effective. For typical off grid folks with
> 8-12 modules, the SB upgrade costs about as much as one additional module,
> and adds more amps in winter when its most needed.
> Allan at PosEn
> ----- Original Message -----
> From: "Joel Davidson"
>
> My own PV system has 4 modules in series. Should I replace my C40 with
> > an SB3048? Yes? No?
>
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