SLA Battery Selection

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diverdon:

Hello Everyone ,

OK .. Another dumb question .. Maybe , I tried to use the search so as to not have to bug you all ..

Been looking at the SLA batteries as I cannot afford a LiFePo4 right now .. My main decesions have been controlled by how much $$ each of the 4 batteries would be and the Amp Hour Rating Which is the Storage Capacity of the battery.. Right??

Now just as I am about to buy the 4 batteries for 48 volts I am thinking about the (Output) rating . Or how many amps/watts each battery will deliver.. I have no Idea how to determine this ...Or how much I need ...Or if it is even a concern ..

I do know enough to use heavy wire to do the wiring .. Like 10 guage maybe . And that I want 10 or 12 Amp Hour Capacity Batteries . Gotta take in the weight of the batteries also .

But as far as telling how much "Output" there is I have no idea .. And haven't seen any talk about it in the several on line stores I've looked at ???

As usual this is too long ... Sorry .. Thanks for all the help you've all given me .. Payday Friday .. Hope to have the bike goin on Monday ..

Thanks Again , Don J.

diverdon:

I'm trying to learn about this online .. No real luck .. I do know that the batteries at the local battery shop are Toyo 6 FM 10 models ... 12 volt 12 AH if that helps any .. But I can't find anywhere that tells the amp output or "C" rating as we call it in model airplane terms ... Thanks again , Don J.

Gapy:
As I know, you should get enough current(power) out of it, but I am not exactly sure that it is good for battery! Usualy this kind of battery has a rank of 1C discarge-in your case this is 12 A, but if given a larger burden you can exceed this on 2C or 3C! Note that higher current cause suflation wich drastically reduce cycles! You should also know that if you discarge your SLA more than 75-80% you also reduce its life!

Gapy

Balderdash:

I chose these 12V 7Ah SLA batteries for the best price/weight/performance ratio:

http://www.thebatteryshop.co.uk/np7-12l-yuasa-12v-7ah-lead-acid-battery-307-p.asp
http://www.yuasa-battery.co.uk/industrial/downloads/NP_pdf_downloads/NP7-12DataSheet-pdf.zip

A good charger is important too...I chose the Ctek one: http://www.ctekchargers.co.uk/ctek-xs800.php
The cheap one I had was overcharging and causing the cells to "gas".

I don't expect these batteries to last forever, but it was a cheap way to get started...

As for wiring I use mains solid core cable - the sort of stuff you use for a 30A ring main...it's what I had spare! (Not sure if it's 1.5mm, or 2.5mm squared)

Leslie:
I use Ritar EV series.

http://www.ritarpower.com/products.aspx?catid=19&pcatid=

This is the model I use now and am glad to own them. Paid $100AUD each about $84USD.

http://www.ritarpower.com/upload/pdf/2009112110502551166858.pdf

24ah batts are 7.2kh each so you will need to mount them well. reasoning behind the heavier models is that I do not usually discharge beyond 50% and these batteries are rated at 300 cycles at 100% dod.

So I should get a bit over a years usage if I ride the bike 10 rides per week at 50% dod.

It is worth getting lithium batteries IMO.

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