I would like to workout how long my battery will discharge itself before a recharge is needed. I have dual NS70ZZ batteries running as a 24v setup and am planning to run my caravan lighting from these while free camping.
I have a Landcruiser 80 Series and wary of flattening the batteries.
Phil C said
03:52 PM Apr 2, 2015
Hi sun and welcome to the forum
To answer your question you need to look at the ampere hour rating of the batteries. This will be something like 110 AH. That means that if the battery is at full capacity it will supply 110 amps of electrical current for one hour.
In practice this is not true for AGM and many of the newer batteries that will suffer a shorter life if discharged below 50%. If you are running LED lighting you should last all night with your setup, most rigs will cut out after your battery gets below a set voltage.
Hope this answered your question.
Cheers
Brenda and Alan said
08:22 PM Apr 2, 2015
sunilshashi can I ask why a 24 volt system as it would be much cheaper to run 12 volt as components for 12 volt are much cheaper.
Alan
sunilshashi said
09:38 PM Apr 2, 2015
Thanks
sunilshashi said
09:39 PM Apr 2, 2015
Alan,
I agree and will be reverting to 12V
Phil C said
09:43 PM Apr 2, 2015
sunilshashi wrote:
Alan,
I agree and will be reverting to 12V
Sunilshashi what a great idea, you have just roughly doubled the time you can have your lights on. Good luck and please be careful when you change from 24 to 12 volts. if you are not sure I would highly recomend you talk to an electrician.
Brenda and Alan said
08:33 AM Apr 3, 2015
Sunilshash you will need to add up the wattage times the hours used for each item to estimate your total requirements. Dividing the total watthours by 12 will give an estimate of the amphours required to meet your needs. Your battery bank needs to be at least twice the amphour rating of your needs to avoid excessive damage due to over discharge.
Sorry Philc but changing from 24 to 12 volts won't change how long the batteries last as the wattage of the lights etc. used in either case would be roughly the same.
Alan
Jaahn said
09:44 AM Apr 3, 2015
sunilshashi wrote:
I would like to workout how long my battery will discharge itself before a recharge is needed. I have dual NS70ZZ batteries running as a 24v setup and am planning to run my caravan lighting from these while free camping.
I have a Landcruiser 80 Series and wary of flattening the batteries.
Hi sunilhashi,
A question ! These batteries, are they your tow vehicle batteries or seperate house batteries.
The tow vehicle batteries have to be more protected than 50% discharge if you wish to start a diesel reliabily.
Perhaps you need to look carefully at the set up before rushing in. How to charge the 12v from the vehicle, for instance.
If the lights are 24v then they draw no more power than 12v lights for the same wattage.
Jaahn
sunilshashi said
11:46 AM Apr 3, 2015
Batteries in question will be House batteries.
Aus-Kiwi said
12:12 AM Apr 7, 2015
They can be charged as 24v (I assume your using the Landcruisers alternated for charging ?)
but load off them can be either 12 or 24v...
sunilshashi said
11:32 AM Apr 7, 2015
I also worry about the caravan battery being overcharged when we are connected to 240V ac.
SnowT said
07:57 PM Apr 7, 2015
Use a smart charger while on 240ac..
- in my setup I use a 12v Ctek charger to keep a 12v battery at full charge....
- My Ctek is powered from My 24v Battery system...
Juergen
-- Edited by SnowT on Tuesday 7th of April 2015 07:57:53 PM
I would like to workout how long my battery will discharge itself before a recharge is needed. I have dual NS70ZZ batteries running as a 24v setup and am planning to run my caravan lighting from these while free camping.
I have a Landcruiser 80 Series and wary of flattening the batteries.
To answer your question you need to look at the ampere hour rating of the batteries. This will be something like 110 AH. That means that if the battery is at full capacity it will supply 110 amps of electrical current for one hour.
In practice this is not true for AGM and many of the newer batteries that will suffer a shorter life if discharged below 50%. If you are running LED lighting you should last all night with your setup, most rigs will cut out after your battery gets below a set voltage.
Hope this answered your question.
Cheers
sunilshashi can I ask why a 24 volt system as it would be much cheaper to run 12 volt as components for 12 volt are much cheaper.
Alan
Thanks
Alan,
I agree and will be reverting to 12V
Sunilshashi what a great idea, you have just roughly doubled the time you can have your lights on. Good luck and please be careful when you change from 24 to 12 volts. if you are not sure I would highly recomend you talk to an electrician.
Sunilshash you will need to add up the wattage times the hours used for each item to estimate your total requirements. Dividing the total watthours by 12 will give an estimate of the amphours required to meet your needs. Your battery bank needs to be at least twice the amphour rating of your needs to avoid excessive damage due to over discharge.
Sorry Philc but changing from 24 to 12 volts won't change how long the batteries last as the wattage of the lights etc. used in either case would be roughly the same.
Alan
Hi sunilhashi,
A question ! These batteries, are they your tow vehicle batteries or seperate house batteries.
The tow vehicle batteries have to be more protected than 50% discharge if you wish to start a diesel reliabily.
Perhaps you need to look carefully at the set up before rushing in. How to charge the 12v from the vehicle, for instance.
If the lights are 24v then they draw no more power than 12v lights for the same wattage.
Jaahn
Batteries in question will be House batteries.
but load off them can be either 12 or 24v...
I also worry about the caravan battery being overcharged when we are connected to 240V ac.
Use a smart charger while on 240ac..
- in my setup I use a 12v Ctek charger to keep a 12v battery at full charge....
- My Ctek is powered from My 24v Battery system...
Juergen
-- Edited by SnowT on Tuesday 7th of April 2015 07:57:53 PM
Sunil and Shashi