Author Topic: New Battery...  (Read 1726 times)

Robert

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Re: New Battery...
« Reply #30 on: 31 August, 2010, 08:42:10 AM »
Hello Robert, I came across this 36v charger on e-bay, item number 360288721618.

I have bought lots of stuff from across the water, no problems so far.

Regards,

Brian.

Hi Brian,

Thanks for the tip! A 36V charger is a much easier solution, and I can integrate it nicely in the Toylander.  8) (why didn't I think of that myself?  ???)
This charger is suitable for 10Ah batteries.
Do you think it will be sufficient for my three 12V batteries which are 26 Ah each ?
"To Be Old And Wise You First Must Be Young And Stupid"

electric4fun

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Re: New Battery...
« Reply #31 on: 31 August, 2010, 08:29:33 PM »
Hi All, I was looking at the drawing and wondered about the 40A fuses,

if you are using GEL batteries it is not recommended to use 'CAR' chargers or 'TRACTION' chargers as these put in a huge amount of amps; GEL batteries cannot withstand that, rule of thumb is that you should not load with a higher Amp than 10% of the batteries AH

saying a 48AH Gel battery should be loaded with a max of 4.8A , it can go a bit higher on the beginning of the load but not during the whole load proces.

just a tought to keep you guys happy driving :-)


best regards,

Luc
« Last Edit: 06 September, 2010, 01:21:33 PM by Richard »

Robert

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Re: New Battery...
« Reply #32 on: 01 September, 2010, 04:40:00 PM »
That's interesting information, Luc!
Does this mean that if I use a 36V / 10Ah battery charger for my 3pc. 12V batteries , which are serial connected, each battery will receive about 1/3 of the loading Amp?
If so, this charger would do the job very well ?
"To Be Old And Wise You First Must Be Young And Stupid"

electric4fun

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Re: New Battery...
« Reply #33 on: 01 September, 2010, 06:39:04 PM »
Robert,

no , the amps do not divide !

when you hook up e.g. 2 batteries of 12 in series on a 24 volt charger, each batterie takes more or less 12 V (depending on the pre-charged state of the batteries )

For the Amps however , all the amps are going trough all the batteries , thats also why i said in another post to first 'level' your batteries by hooking them up in parallel (+ to + and - to - please .. ! ) so they have the same charge. this avoids that 1 battery will surge more amps then the other need.

if you put two batteries in series that where 1 is e.g. almost flat and the other is full... the flat one will drive the loading and the Amps causing the other one to have to swallow the Amps too
= overcharging

I'm not an battery-expert , all the above is from experience so i might be off a bit , tough , so far i managed to keep all my batterys in a happy state .

to underline my statement , i have here 4 X 100AH batteries 6V for my truck   , i load them with a 24 volt charger all in 1 series its a 10 ACharger

(remind : load Gel batteries with a max of 10% of their capacitity in AH ) 

if you are not comfortable , a multi-meter is your friend,

1-first 'level the batteries (parallel
2-measure and write down the voltage for each battery
3-hook up the batteries  in series , put them on the charger ,
4-firts measure the Amp (you can do this in any part of the circuit)
5-then measure the voltage that 'hangs' over each battery by putting you meter on V and the pins on the + and - , all voltages should be fairly the same .

if one is off scale to the other ones (should be noticable on 2 ) it is either discharged, has a failure  or is simply broken .do not continue loading .

 
best regards,


Luc

Robert

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Re: New Battery...
« Reply #34 on: 02 September, 2010, 12:16:25 PM »
OK ....

So, if I connect my 3 batteries (12V / 26 Ah each) serial, and load them with a 36V / 10 Ah charger, it should be functioning without problems.
That is, if all three batteries are equally discharged.

But in My case, I noticed that the last battery in the line, where the + 36V is connected, is allways discharged the most.
I don't know if this is common for such a setup, or the battery is getting weak.
But I will overload the other two batteries of I charge all three of them at once.
So I 'd better charge each battery separately, like I'm doing at this moment.

am I right?
"To Be Old And Wise You First Must Be Young And Stupid"

electric4fun

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Re: New Battery...
« Reply #35 on: 04 September, 2010, 09:49:15 PM »
Hi Robert,

yes , if one battery is 'out of shape' do not load them in series


more intresting reading on battery use and load

wiring multiple barrery's on a charger  :
http://www.batteryminders.com/batterycharger/charging_multi_batteries.php#6

batteries and their resistance ,very intresting article , see section 12 on this page :
http://homepages.which.net/~paul.hills/Batteries/BatteriesBody.html
(it more or less confirm my above )


best regards,

Luc