navitron
 
Renewable Energy and Sustainability Forum
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Anyone wishing to register as a new member on the forum is strongly recommended to use a "proper" email address - following recent spam/hack attempts on the forum, all security is set to "high", and "disposable" email addresses like Gmail, Yahoo and Hotmail tend to be viewed with suspicion, and the application rejected if there is any doubt whatsoever
 
Recent Articles: Navitron Partners With Solax to Help Create A More Sustainable Future | Navitron Calls for Increased Carbon Footprint Reduction In Light of Earth Overshoot Day | A plea from The David School - Issue 18
   Home   Help Search Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: peukert (sorry Rog)  (Read 2223 times)
billi
Global Moderator
Hero Member
*****
Offline Offline

Posts: 8926



WWW
« on: April 18, 2010, 07:43:54 AM »


dodgy rog

battery c ratings
« on: April 17, 2010, 04:44:20 PM »
   
hello my battery is 24V 625ah C5 can some one please tell me how to work that out in ah at C20  rating so that i can set up my monitoring equipment properly, i am shore it is not complected but today i have a block on maths?
oh yes and don't forget to clean the ash of your panels!


   
johnrae



   
   
Re: battery c ratings
« Reply #1 on: April 17, 2010, 07:55:36 PM »
   
You really need to go back to the battery manufacturer to get a definitive answer.

If your batteries really are rated at C5 then at C20 their capacity will be much higher

You won't be too far out if you consider C10=120% of C5 and C20 to be 120% of C10  So, C20 will be around 140% of C5

Therefore your 625C5 will be around 875C20

jack



   
dodgy rog






   


thanks Jack, anyone else who can add to this please don't be shy this involves .....
Peukert's Exponent but thats where im lost



billi



   
   
Re: battery c ratings
« Reply #3 on: Today at 06:21:36 AM »
   
Rog  close to all i know about peukert`s   is out of the manual of my battery monitor


Quote
2.3.2 Peukert’s exponent
As mentioned in chapter 1.3, the Peukert efficiency describes how, when
you discharge a battery faster than the 20 h rating, its Ah capacity
decreases. The amount of battery capacity reduction is called the ‘Peukert
exponent’ and can be adjusted from 1.00 to 1.50. The higher the Peukert
exponent the faster the battery size shrinks with increasing discharge
rate. An ideal (theoretical) battery has a Peukert Exponent of 1.00 and
has a fixed capacity; regardless of the size of the discharge current. Of
course such batteries do not exist, and a setting of 1.00 in the BMV is only
implemented to bypass Peukert compensation. The default setting for the
Peukert exponent is 1.25, and is an acceptable average value for most
........................................................ Roll Eyes Tongue

they have a calculator for download
Peukert Calculator

http://www.victronenergy.com/support-and-downloads/software/


Billi
Logged

1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
billi
Global Moderator
Hero Member
*****
Offline Offline

Posts: 8926



WWW
« Reply #1 on: April 18, 2010, 07:46:08 AM »

Sorry Rog something happened and  i cannot figure out how to bring back your original thread

So that is what has been posted

Billi
Logged

1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
dodgy rog
Full Member
***
Offline Offline

Posts: 123


« Reply #2 on: April 19, 2010, 07:28:22 PM »

thanks guys, im afraid my head is not really up to the maths at the moment, we are trying to work out how to get my pregnant partner back from uk!
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.20 | SMF © 2013, Simple Machines
SMFAds for Free Forums
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!