through the list serve.
Thanks,
Walt
From: Larry Crutcher, Starlight Solar [mailto:la...@starlightsolar.com]
Sent: Tuesday, June 30, 2009 1:37 PM
To: wratter...@sunenergypower.com; RE-wrenches
Subject: Re: [RE-wrenches] Solar Boost Controller in Senegal
Hi
From: Rick Cullen - Blue Sky Energy, Inc. [mailto:r...@blueskyenergyinc.com]
Sent: Monday, June 29, 2009 10:14 AM
To: wratter...@sunenergypower.com; 'RE-wrenches'
Subject: RE: [RE-wrenches] Solar Boost Controller in Senegal
Hello Everyone,
The SB50's maximum input voltage spec it 57VDC
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Walt Ratterman
Sent: Friday, June 26, 2009 3:22 PM
To: 'RE-wrenches'
Subject: [RE-wrenches] Solar Boost Controller in Senegal
Hello,
I am in a very remote part of Senegal, (near the Guinea and Mali borders…) and
I have come across
-wrenches] Solar Boost Controller in Senegal
Walt,
I would also offer that in a hot climate, MPPT in general is only useful in a
case where odd cell counts take the Vmp away from 24V nominal specs. That is,
MPPT was originally developed to harvest the voltage headroom between Voc and
Vmp
-wrenches
Subject: Re: [RE-wrenches] Solar Boost Controller in Senegal
Not sure why you think that cell matching is an incorrect use for MPPT. That
is one of it's biggest advantages.
..
Northern
Allan,
MPPT technology is for harvesting the most power possible from any
voltage being produced above the battery voltage, not the difference
between Voc and Vmp. Because of this, nearly every battery charging
system will benefit from MPPT chargers. The climate does not matter
for
-wrenches' mailto:re-wrenches@lists.re-wrenches.org
Sent: Tuesday, June 30, 2009 1:26 AM
Subject: Re: [RE-wrenches] Solar Boost Controller in Senegal
Hello all,
I would like your input on what you think should be done here.
Nine systems were purchased from Earthwalk. One has been
...@sunenergypower.com; RE-wrenches
Subject: Re: [RE-wrenches] Solar Boost Controller in Senegal
The AGM batteries are probably a better choice than gelled, but the
fact that some are down to 5 volts is the real problem.
A typical AGM will lose around 1-2% charge per month at 25 degrees
C
From: Larry Crutcher, Starlight Solar [mailto:la...@starlightsolar.com]
Sent: Tuesday, June 30, 2009 1:37 PM
To: wratter...@sunenergypower.com; RE-wrenches
Subject: Re: [RE-wrenches] Solar Boost Controller in Senegal
Hi Walt,
You are right! Gel batteries will give many more cycles
a couple of them
are in operation so far….)
Thanks,
Walt
From: Rick Cullen - Blue Sky Energy, Inc. [mailto:r...@blueskyenergyinc.com]
Sent: Monday, June 29, 2009 10:14 AM
To: wratter...@sunenergypower.com; 'RE-wrenches'
Subject: RE: [RE-wrenches] Solar Boost Controller in Senegal
Hello
Gudgel b...@midnitesolar.com
Subject: Re: [RE-wrenches] Solar Boost Controller in Senegal
To: RE-wrenches re-wrenches@lists.re-wrenches.org
Date: Saturday, June 27, 2009, 2:35 AM
Wind-sun.com wrote:
Yes, it is a poor design. though you may not have any
problems there with the heat de-rating
/
..
- Original Message -
From: Walt Ratterman wratter...@sunenergypower.com
To: 'RE-wrenches' re-wrenches@lists.re-wrenches.org
Sent: Saturday, June 27, 2009 4:28 PM
Subject: Re: [RE-wrenches] Solar Boost Controller in Senegal
Hello
/
..
- Original Message -
*From:* Walt Ratterman mailto:wratter...@sunenergypower.com
*To:* 'RE-wrenches' mailto:re-wrenches@lists.re-wrenches.org
*Sent:* Friday, June 26, 2009 3:22 PM
*Subject:* [RE-wrenches] Solar Boost Controller in Senegal
Hello
Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Larry
Crutcher, Starlight Solar
Sent: Saturday, June 27, 2009 7:42 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Solar Boost Controller in Senegal
...And the Voc is present
Walt,
This morning I left a message on Rick Cullen's cell phone about this thread.
He called back, said he's on the Wrenches list as a manufacturer's rep and
he will check the thread and respond. So watch your Wrenches email before
taking corrective action.
Allan
Allan Sindelar
:
From: Walt Ratterman wratter...@sunenergypower.com
Subject: Re: [RE-wrenches] Solar Boost Controller in Senegal
To: 'RE-wrenches' re-wrenches@lists.re-wrenches.org
Date: Saturday, June 27, 2009, 6:28 PM
Hello again,
Thanks to all of you who chimed in with suggestions and
comments on this
very
I think you're right: it's hot enough there that the Voc never hits
the 57 v BLue Sky death point. Problem is, if you rewire those
modules for parallel, their mpp won't match the SB50. According to
Blue Sky's Tech bulletin #100214, it wants to track MPP between 33 v
-37 v. YOu could add
Walt..i believe those controllers will give you an MPPT boost going from
24V nominal in which eqautes to 44Voc in to 12Vnominal out.in this
scenario 57Voc max is sufficient.
The sharp panels you mention series together will exceed the 57Voc and
should cause trouble for the charge
Larry Crutcher, Starlight Solar wrote:
If the SB50 is like other Solar Boost products, there is a zener diode
on the PV input that will open if the voltage exceeds the Voc maximum.
The controller will not burn up or be fried but you will have to
replace the diode. Why it has not happened yet
Discussion Forum: http://www.wind-sun.com/ForumVB/
..
- Original Message -
From: Walt Ratterman
To: 'RE-wrenches'
Sent: Friday, June 26, 2009 3:22 PM
Subject: [RE-wrenches] Solar
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