Voltage drop musings [RE-wrenches]

Wed May 2 18:23:12 PDT 2001

Joel,

Are you trying to say you have thirty two 70 watt modules?  8 strings x 4.?
amps = 30 + amp array.  You will need two Solar Boost 3048's.  Better yet
put 16 on the C40 and 16 on the SB3048 (you'll need a DVM option for it too)
and compare the outputs.   Do you have a Fluke 36 ammeter?  If you don't
borrow/buy one (~$250 and you really should have one) and compare it's amp
rating to your C40's.  I almost always find the C40 DVM's to read amps ~10%
low.  I have found the SolarBoost products to be very accurate.  (Never pass
a chance to beat up on Trace, just kidding, maybe)

Oh yeah, your question,  you should produce up to 30% more amps when its
colder, say less than 40F.  In the summer you will only see a 10% (maybe)
difference when the batteries are under 50 volts in the cooler mornings
which you won't see since you are grid tied.

Travis Creswell
Ozark Solar

----- Original Message -----
From: "Joel Davidson" <joeldavidson at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Wednesday, May 02, 2001 6:51 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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