Voltage drop musings [RE-wrenches]

Wed May 2 20:31:46 PDT 2001

To your initial question, Joel, I would say more the latter. Of course, "it
depends". Boost is all based on the voltage differential between MPP and
load voltage. Higher the differential, greater the boost, which is why
benefit is greatest in winter: cold modules operate at higher voltage, and
battery voltage is often lower as well. So your boost may be less at 4:30pm
on a warm SoCal day. I would suspect that the display would read PV input of
about 15.5A at 69 volts (remember, input amps will actually be a bit lower,
as the C40 is operating above the PV knee), with output being around 1069
watts. At 96% (a rough guess) that's 19A in at battery voltage of 54 volts.
Allan
----- Original Message -----
From: "Joel Davidson" <joeldavidson at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Wednesday, May 02, 2001 5:51 PM
Subject: Re: Voltage drop musings [RE-wrenches]

> 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?
>

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