t; From: R Ray Walters
>> To: RE-wrenches
>> Sent: Saturday, September 3, 2011 5:55 PM
>> Subject: Re: [RE-wrenches] unique battery bank design question
>>
>> Systems I tried years ago with Vanner equalizers, still ended up being
>> unequal. I pulled them all years
On 9/3/2011 7:57 PM, Darryl Thayer wrote:
I have had one experiance with equalizers, the batteries be came very
unequal. (over time of course)
*From:* R Ray Walters
*To:* RE-wrenches
*Sent:* Saturday, September 3, 2011 5:55 PM
*Subject:* Re: [RE-wrenches] unique battery bank design question
I have had one experiance with equalizers, the batteries be came very unequal.
(over time of course)
From: R Ray Walters
To: RE-wrenches
Sent: Saturday, September 3, 2011 5:55 PM
Subject: Re: [RE-wrenches] unique battery bank design question
Systems I tried years ago with Vanner equalizers
Systems I tried years ago with Vanner equalizers, still ended up being unequal.
I pulled them all years ago. It seems to be about as much a problem as not
balancing your battery cables so each battery string has the same wire
resistance,
I know that you couldn't imagine a few amps on 12" of 2/0
There is only one 12 volt tap and one 24 volt tap plus ground. Picture two 12
volt batteries in series for 24 volts with the center going to the 12 volt tap.
The only other positive voltage source is the 24 volt connection. The equalizer
pulls from that terminal to maintain equilibrium between t
I am merely a solar bozo.
One correction, I think it "shares" current from the second 12 V tap, not the
24 V tap.
I do not know if the equipment is capable of an equalizing scheme whereby it
can tap 12 V and 24 V off the same 48 V string (per the original question in
this thread), but a quick
Correct. As a mobile RE dealer and service center, I see quite a few 24 volt
systems with Vanner or other equalize type converters. As 12 volt current
increases it causes one battery voltage to drop. The equalizer then shares
current from the 24 volt tap to the 12 volt tap to maintain equal volt
duction.
Joel Davidson
- Original Message -
From: "Rob Shappell"
To: "'RE-wrenches'"
Sent: Friday, September 02, 2011 6:53 AM
Subject: Re: [RE-wrenches] unique battery bank design question
As far as I know, The DC/DC and the Equalizers do basically the same
What the Vanner Voltmaster equalizer does is track the voltage differences
between two parts of the string, and provides current from the other part to
the first part when needed. If a tap decreases the voltage in part of the
string, the other part of the string is used to help make up for it --
Rob Shappell
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Jason
Szumlanski
Sent: Friday, September 02, 2011 9:42 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] unique battery bank design question
Yeah, Rob
Behalf Of Rob
Shappell
Sent: Friday, September 02, 2011 8:24 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] unique battery bank design question
I never, never recommend taps of any sort, but sometimes we have to
satisfy
the needs of the customer. If any taps are done in any manner I would
battery bank design question
At 19:39 -0400 1/9/11, Jason Szumlanski wrote:
>Sorry - I missed the 4 days part of your post. I'm not sure where you
>came up with 4 days - sounds kind of arbitrary.
Any chosen time is arbitrary. Maybe I should have chosen a month.
700 amphours. Dead f
At 19:39 -0400 1/9/11, Jason Szumlanski wrote:
Sorry - I missed the 4 days part of your post. I'm not sure where you
came up with 4 days - sounds kind of arbitrary.
Any chosen time is arbitrary. Maybe I should have chosen a month.
700 amphours. Dead flat 12 volt battery. I often use 4 days
Or a switch...
At 03:14 PM 9/1/2011, you wrote:
.. to allow a DC appliance to wait and simply turn on when when
necessary and not waste power when it is off would take a battery
.. internal or external to the appliance.
___
List sponsored by Home
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Hugh
Sent: Thursday, September 01, 2011 5:05 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] unique battery bank design question
At 16:48 -0400 1/9/11, Jason S
At 16:48 -0400 1/9/11, Jason Szumlanski wrote:
1a x 12V x 24hrs = 288 watt-hours on a 48,000 watt-hour battery. My math
shows 0.6% of the nominal capacity. And that assumes there is no
charging source present.
Wrong again. Sorry.
You are taking out four times that percentage out of just one q
ain ..
no?).
Dan
--- On Thu, 9/1/11, Darryl Thayer wrote:
From: Darryl Thayer
Subject: Re: [RE-wrenches] unique battery bank design question
To: "RE-wrenches"
Date: Thursday, September 1, 2011, 5:01 PM
I am both interested in the idle power, and the operating efficiency
This ofte
problems with taped
battery banks so avoid is the first rule.
This would make an interesting measurement.
From: mac Lewis
To: RE-wrenches
Sent: Thursday, September 1, 2011 3:59 PM
Subject: Re: [RE-wrenches] unique battery bank design question
Glad I asked! Do these converters have a decent
, 2011 3:30 PM
Subject: Re: [RE-wrenches] unique battery bank design question
Hi Jason,
Well designed off-the-shelf converters can achieve 90% efficiency, and as you
mention, this will vary a bit depending on the rated output current of the
converter vs. the actual load current.
I've designe
curious what that level is!
>
> Jason Szumlanski
> Fafco Solar
>
>
> -Original Message-
> From: re-wrenches-boun...@lists.re-wrenches.org
> [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Hugh
> Sent: Thursday, September 01, 2011 4:21 PM
> To: RE-w
bject: Re: [RE-wrenches] unique battery bank design question
At 15:57 -0400 1/9/11, Jason Szumlanski wrote:
> A 1A @ 12V fan on a 1000aH @48V battery bank can't make any real
>difference. Correct me if I am wrong!
>
Yes that is wrong, because after 4 days you have removed
s-boun...@lists.re-wrenches.org] On Behalf Of mac Lewis
Sent: Thursday, September 01, 2011 3:52 PM
To: RE-wrenches@lists.re-wrenches.org
Subject: [RE-wrenches] unique battery bank design question
Hello wrenches,
I have a battery bank questions. I have an Oil & Gas client interested in
setting up a
o: RE-wrenches@lists.re-wrenches.org
Subject: [RE-wrenches] unique battery bank design question
Hello wrenches,
I have a battery bank questions. I have an Oil & Gas client interested in
setting up an off-grid control system that has a various DC loads at 12VDC,
24 VDC and 48 VDC. My thou
n the 95% realm.
Your mileage may vary.
Dan
--- On Thu, 9/1/11, Jason Szumlanski wrote:
From: Jason Szumlanski
Subject: Re: [RE-wrenches] unique battery bank design question
To: "RE-wrenches"
Date: Thursday, September 1, 2011, 3:07 PM
Dan, What kind of efficiency level (%) can you
At 15:57 -0400 1/9/11, Jason Szumlanski wrote:
A 1A @ 12V fan on a 1000aH @48V battery bank can't make any real
difference. Correct me if I am wrong!
Yes that is wrong, because after 4 days you have removed 10% of the
nominal capacity or about 20% of the usable capacity.
Tapping off batt
011 3:58 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] unique battery bank design question
Mac,
Don't tap the battery. Bad idea. Uneven loading = unequal
charge/discharge, which leads to shortened battery life and other
troubles.
Better idea: If you know the maximum load current, use hi
I always thought small multi-voltage taps, for example a 12 volt
domestic water pressure pump center-tapped from a 24 volt battery bank,
would be no problem, too, but experience and troubleshooting calls have
proved otherwise. Even such a low-power intermittent use has caused
serious problems i
mac,
Don't tap off various voltages. Use DC-DC converters for any voltage
other than nominal. Anything else will lead to uneven charging and
shortened life.
Allan
Allan Sindelar
al...@positiveenergysolar.com
NABCEP Certified Ph
12 or 24V.
Dan
Sr. Engineer
Exeltech
--- On Thu, 9/1/11, mac Lewis wrote:
From: mac Lewis
Subject: [RE-wrenches] unique battery bank design question
To: RE-wrenches@lists.re-wrenches.org
Date: Thursday, September 1, 2011, 2:52 PM
Hello wrenches,
I have a battery bank questions. I have an Oil
ts.re-wrenches.org
Subject: [RE-wrenches] unique battery bank design question
Hello wrenches,
I have a battery bank questions. I have an Oil & Gas client interested in
setting up an off-grid control system that has a various DC loads at 12VDC, 24
VDC and 48 VDC. My thought is to bui
Hello wrenches,
I have a battery bank questions. I have an Oil & Gas client interested in
setting up an off-grid control system that has a various DC loads at 12VDC,
24 VDC and 48 VDC. My thought is to build a 48 V battery bank and tap off
the bank at various points to create a 12V bus, 24V bus
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