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24 vdc LVD, LVR

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Posted by Bob on January 12, 2007, 9:36 am
 
Hi:

Can any tell me the recommended low voltage disconnect (LVD)and low
voltage reconnect (LVR) for flooded deep cycle batteries?

Bob


Posted by Bob on January 12, 2007, 9:36 am
 
Hi:

Can any tell me the recommended low voltage disconnect (LVD)and low
voltage reconnect (LVR) for flooded deep cycle batteries?

Bob


Posted by DJ on January 12, 2007, 12:34 pm
 
Bob wrote:

Well, there's two answers. Quick answer, usually 11.5-12.5 (23-25,
etc).

Long answer, it can depend on the system and the particular battery
bank.  But the above settings are the most common in the industry.

DJ


Posted by Bob on January 13, 2007, 12:40 am
 
DJ wrote:

 We have a Mason (12V) PV Charge Controller SBC 7120. It states that
the controller has been factory preset for the following. Bulk Voltage
14.5V, float voltage 13.5V, Low voltage disconnect 11.5v, low voltage
reconnect 12.5V and goes on to say, in part. The preset Bulk and Float
Setpoints are for typical Sealed Gel-type Lead Acid Battery only. For
typical wet-tpe Lead Acid Battery, set Bulk setpoint to 14.8V and Float
setpoint to 13.5V. Please refer to battery manufacturer's specific
recommended values.
Hmmmm! Wonder if there was a misprint there when they stated to set
float to 13.5 and did not mention a setting for LVR.  I have two of
these 12 vdc controllers for two other solar projects. The only problem
is I could never get them to work with night time operaion so for one
project I use a 12 vdc recycling timer. The other project doesn't
require a night time setting as we use it during the day for our water
aeration project.

Bob


Posted by DJ on January 13, 2007, 9:51 pm
 
Bob wrote:


Sounds good.


A bit odd, as the information I saw on-line on this controller says
different:
http://www.reihk.com/shop/product_info.php?products_id8


Nah, by and large, LVD and LVR are standard.


You were having them disconnect from their loads at night? Sounds more
like you should have more batteries. It seems that you aren't storing
enough power during the day for your application, either because you
don't have enough generation (panels) or enough battery capacity (your
panels are filling your battery capacity early in the day, and then
doing nothing for you).
Using a timer is working, but if you are regularly going below the
normal LVD, you are probably damaging your battery bank, not the ideal
situation.
 
DJ


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