Hello All , Please can someone help me . I am getting ready to buy the 4 12 volt SLA Batteries for the Bike I'm setting up .. I know what the Amp Hour Rating is but cannot find th amps output rating of any of these Sealed Lead Acid batteries SLA .. Can someone please teach me about this ??
The batteries I am looking at are the Toyo 10AH ones that are part # 6FM 10 . The bike motor is a 1000 watt max motor and calls for 48 volts .
I have no idea if there is even any reason to worry about this ?? Maybe all of the SLA Batteries will work ??
I did try to use a search to find this so as to not have to bug you all .. Any Help will be really appreciated .. Thanks again , Don J.
10 ah lead-acid batteries are not a good choice for a 1,000 watt motor operating at 48 volts, because the motor, at full power, will require over 20 amperes. Drawing 20 amperes from a 10 ah lead-acid battery will result in a very short discharge life, perhaps only 15 minutes per charge, and the cells would heat up noticably, as a significant portion of the power would be lost in the batteries internal resistance. A much better choice would be a liFePO4 battery, of at least 20 ampere-hour capacity. This lithium battery could provide about one HOUR of full-power operation, and still not weigh much different than the poor performing lead-acid battery! If you insist on lead-acid, expect to buy new ones much more often, and get a bigger set, preferably something rated for at least 25 ah, if good operation at the 48 vot, 1,000 watt level is expected.--Bob
Robert M. Curry
Hello Bob ,
Thank you for posting an answer for me . It is not what I wanted to hear but sometimes that's the way it is ..
I am more confused now and maybe in Denial about the need for such an expensive battery to run this bike .. The thing is I was thinking there are lead acid batteries that have smaller amp outputs and some that have larger ones ??? And I am sure that I have read where people have used SLA batteries for electric bikes .. Perhaps they were smaller motors than the one I have and that's it ..
One other website I posted this question on gave me this answer ......
Posts: 4
Re: SLA Battery Selection
« Reply #2 on: Today at 10:17:18 AM » Quote
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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
The motor I'm using can run on 24 , 36 , or 48 volts and I remember from th model airplane hobby that when you put a load on the battery they drop their voltage but still work untill they go below the speed controller minimum voltage . I am thinking with 48 volts that the drop cannot be below 24 volts on a load . Also the "load" will not be so great all of the time as much of th time the bike will be Crusing and not accellerateing ..
The main thing I was wondering about is are some of the SLA Batteries built with a lower output Ampreage like the model plane/car batteries ... They call it the "C" rating .. and if you apply too much amp load to a low C rated battery the Voltage drops a lot and quickly ..
I hope this is not too much of a dumb reply or that I am not like I said just In Denial ...
Here's a link to another set of batteries supposto be for Bikes
http://cgi.ebay.com/4-12V-12ah-SLA-Batteries-for-Electric-Bike-Scooter_W0QQitemZ180434790972QQcmdZViewItemQQptZPCA_UPS?hash=item...
These are 12 AH batteries instead of 10 but I'd have to order them rather than buy locally ??
So anyways .. Really .. Thank you for your help I really hope that I can get away with SLA Rather than LiFePo4 For now ?? Thanks Again , Don J.
Don,
Lead batteries will add a lot of weight, as I'm sure you are aware, versus Lithium which is about half as heavy, but still quite expensive at this point.
When a battery states that it is for UPS, it is designed to sit around on "standby" for long periods awaiting a potential power failure. Typically, they would not deliver high amps needed for EV's. Look for some that are "deep cycle". I looked briefly at the Toyo specs and they do not list discharge rates in the marketing info.
And yes, 1000W is pretty high for a bike. Also, the post above mentioned 24V as the cutoff to protect the batteries from overdischarging. 48V controllers would typically cutoff at ~42V (10.5V per battery).
Hello e-doggies , I didn't want to disclose which kit I am going with because it seems to me there are a lot of people with bad experiences from this company in the past ..
Anyhow it's the Magic Pie from Golden Motors and I felt Ineeded to mention it because the controler is supposto run on any of 3 voltages 24 -36 or 48 I think the cut off woltage would be pretty low as it wii run on as low as 24 volts ??
I am a realllly Newbie but that is my reasoning ?? probabally wrong .. but that's why I mentioned it ..
I have been looking tonote for li fe po battery prices and it is scary .. I know the long life argument but if you don't have the cash to begin with it doesn't matter ...
I'd even put my on battery together .. I can solider .. But the prices for even the cells to build batteries is just as bad ... I just hope to get away with Lead Acid SLA Batteries for a while so I can put together the $$$$ to get the lifepo one ... Thank You for the iofo. you posted , Don J.