wrote:
From: Warren Lauzon
Subject: Re: [RE-wrenches] PV excellent battery charger
To: "RE-wrenches"
Date: Saturday, March 27, 2010, 10:55 AM
To be honest, I don't think the question makes
any sense. There are several "right" answers, but no good ones. I hope t
wer! But you knew that.
>
> Larry Crutcher
> Starlight Solar Power Systems
> (928) 342-9103
>
> Mailing Address:
> 11881 S. Fortuna Road, #210
> Yuma, AZ 85367
>
> Retail Store & Shipping Address:
> 2998 Shari Ave.
> Yuma, Az 85365
>
>
> - Original
s
Sent: Saturday, March 27, 2010 9:28 AM
Subject: Re: [RE-wrenches] PV excellent battery charger
Hi Dave,
At 10:44 AM 3/26/2010, you wrote:
Is the answer here (at least the one that NABCEP intends) just that the VMP
of a "12V module" is higher than the voltage of a
Hi Dave,
At 10:44 AM 3/26/2010, you wrote:
Is the answer here (at least the one that NABCEP intends) just that
the VMP of a "12V module" is higher than the voltage of a 12V
battery? With the higher voltage it will charge the battery with its
corresponding current based on the I-V curve. The ob
Is the answer here (at least the one that NABCEP intends) just that the
VMP of a "12V module" is higher than the voltage of a 12V battery? With
the higher voltage it will charge the battery with its corresponding
current based on the I-V curve. The objective reads "Explain why PV
modules make e
clude owner abuse or neglect, we all see
that.
Later,
Bob
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of R Ray
Walters
Sent: Thursday, March 25, 2010 5:59 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] PV
olar Power Systems
(928) 342-9103
Mailing Address:
11881 S. Fortuna Road, #210
Yuma, AZ 85367
Retail Store & Shipping Address:
2998 Shari Ave.
Yuma, Az 85365
- Original Message -
From: "R Ray Walters"
To: "RE-wrenches"
Sent: Wednesday, March 24, 2010 10:51 PM
Subje
On Mar 25, 2010, at 5:55 AM, Warren Lauzon wrote:
> Actually, PV is not a particularly excellent battery charger,
What is better than a properly sized array with the latest controllers?
>
> Everything else mentioned can be done by any decent AC battery charger.
True, but at great expense. Th
Of course, the MPPT makes the PV array behave like a larger array, but that's
comparing MPPT to non- MPPT, I thought you were comparing PV to a regular AC
charger.
R. Walters
r...@solarray.com
Solar Engineer
On Mar 25, 2010, at 4:40 AM, drake.chamber...@redwoodalliance.org wrote:
> My under
sday, March 25, 2010 3:40 AM
Subject: Re: [RE-wrenches] PV excellent battery charger
My understanding is that the voltage, in excess of battery voltage, from
the array, represents energy that is dissipated as heat in the batteries.
This extra voltage, multiplied by the amperage is wattage. This e
My understanding is that the voltage, in excess of battery voltage, from
the array, represents energy that is dissipated as heat in the batteries.
This extra voltage, multiplied by the amperage is wattage. This extra
power can produce more amps at a reduced voltage. It is amperage that
charges th
MPPT doesn't really do that much for the battery, it just makes the PV modules
more effective.
The real magic is:
A) the 3 stage charging (compared to traditional single stage AC chargers)
B) Temperature compensation
C) PWM that helps pulse off sulfation
D) Slower charge rates let batteries charg
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