Mark,
If you are working with industrial batteries where you have lots of
options for battery capacity, what you are saying makes sense. But not
if you are assembling commercial (L16 or T-105 types) batteries to get
more capacity. The reduced effort for measuring specific gravity
watering for a 24-volt system with 12 cells, I'll concede to. But there
is less to gain when it comes to watering, the 12 cells should end up
taking as much water and almost as much time to put it in the cells.
In addition to being more efficient, the 48-volt inverter can operate
with one or two 2-volt cells removed.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 1/17/2012 11:19 AM, Mark Frye wrote:
Interesting.
I can choose an OB VFX3524 w/ 85 ADC or an OB VFX3648 w/ 45 ADC of charging
capacity.
And assuming that I need C/10 during bulk charging (and the importance of
this is really what I am asking about) then:
VFX3524: 85 ADC * 10 = 850 AH * 24 VDC = 20.4 kWH battery bank
VFX3648: 45 ADC * 10 = 450 AH * 48 VDC = 21.6 kWH battery bank
OK, so it's about a wash either way in terms of stored energy.
But assuming for the moment that distances are short and the initial
difference in copper costs are small, wouldn't you rather have half the
number of individual cells to maintain...less watering, less SG measuring,
lower overall "part" (individual 2V cells) count?
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
www.berkeleysolar.com
-----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: Tuesday, January 17, 2012 10:38 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] 24 vs. 48
The only advantages of 24 v are that you can create smaller KWH battery
banks, and that Bergey's XL.1 was only available in 24 v.
Anytime the design allows, I jump to 48 v.
R. Walters
r...@solarray.com
Solar Engineer
On Jan 17, 2012, at 11:11 AM, Nathan Jones wrote:
Mark,
It would seem to be a wash. As the voltage is halved the amperage is
doubled in the battery bank. This would seem to require doubling the
charging amperage so nothing is gained. On a system of any size the 48 volt
gets the default nod here. Charge controllers handle twice the solar.
Parallel battery strings are eliminated, or at least held to two. Wire
sizing might be reduced on the low voltage side of things. And much easier
future expansion possibilities, too.
Cheers,
Nathan Jones
Power Source Solar Inc
------------------------------
On Tue, Jan 17, 2012 10:56 AM CST Mark Frye wrote:
Not really on topic to Jay's question, but...
Is 48v always better than 24v?
How important is bulk charging current to overall battery life?
In some cases, isn't it better to use a 24v inverter/charger which
can develop a higher charge current for a battery bank that has a
higher AH rating?
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
www.berkeleysolar.com
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of jay
peltz
Sent: Tuesday, January 17, 2012 8:43 AM
To: RE-wrenches
Subject: [RE-wrenches] battery buss bars
Hi All,
Where do I find buss bars for a battery parallel problem?
I've got to fix a brand new ( not me) system, that has 4 sets of
L-16's at 24v.
Yea yea why didn't they go to 48?
So I want to use buss bars to parallel them, and looking for premade
ones.
Thanks in advance,
Jay
Peltz power
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options& settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive:
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules& etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options& settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive:
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules& etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options& settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive:
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules& etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options& settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules& etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
