Electrical buffs out there

brendy

brendy

brendy

Soldato
Joined
27 Apr 2007
Posts
3,243
When it comes to batteries I am virtually clueless, basically I am looking to find out which battery is the better spec,
12v 24ah 10hr
12v 24ah 20hr

Does the hr rating mean the battery can supply the given amp ratings for that amount of time?
 
yes your right about the amp rating bieng supplied for the given time, so all in all i reckon the second one would be a better battery.
 
stude, cheers id already read/glazed over it but couldnt find the exact bit that confirmed what I was thinking.
I think im going to keep this one for a while then upgrade to a 30ah 20hr battery.
Cheers again.
 
I don't understand the HR bit at the end.

The 24AH bit tells you the capacity of the battery in Amp Hours. It basically means that if the current drawn from the battery is 24A then the battery will last 1 hour.
 
The next variable to throw into the mix is that it will be covering around 4-4.5 miles of undulating land pulling 30 kilos+ at speeds from 2-7km/h. Im thinking that it will do around 5-6 miles total. Ill be finding out later this week :D
 
A 3 wheeled golf trolley. Ive gotten fed up getting sore patched on my left shoulder carrying my tour bag.
I was also trying to figure out a way of setting up a simple led or lcd battery gauge. Any ideas?
 
A simple voltmeter connected in parallel will give you a readout of the voltage. You could further set it up to display a green led when above a certain voltage, say 11.5v, a yellow LED when between 10 & 11.5v and a red LED when below 10v. You would have to gauge the voltages yourself to figure out at what voltage you would want the individual lights on.
 
I've been suspended twice in the last 2 weeks for posting links to "Competitors". There is a couple of large well known online electronics supliers that I would suspect of stocking what you need.
 
fair enough mate but ive tried paplins, to me they are not competitors for shizzle like this, I think the censorship is a little stringent to be honest when its out of context of computers.
 
Ok before you part with cash

you need a deep cycle sealed battery , ie one that is designed for discharging and then recharging.

unlike say a car battery that is for a short high load and then kept charged all the time ,use these for a golf trolly ,it will last for about six months


your first question would take a long time to explain, A discharge rate, in amperes, of a battery which will deliver the specified hours of service to a given cutoff voltage

getting in deep now :D

also you will need a special type of charger ( not a halfraud one ) ie one that detects the cell volts and then reduces the charge rate for a fixed time ( to equalise the voltage across each cell , it will then shut down to a very small charge to maintain the batt

please go to a battery specialist shop and ask thier advice as to the correct cell and charger
 
Ok lordedmond, the battery that came with the trolley is a 12v 24ah 10hr job with a 3 am inline fuse, the charger is matched to the battery from factory, I think its a 3 stager by the looks of it.
 
ok then get the exact same one for the replacement then the charger will be ok
by the sound of it you may have a "hill billy" if so they are competive for replacement batts

as i said goto a proper batt shop the make is not important its the spec that matters



good luck with the golf i used to do 4 or 5 round a week but two "K" hips have put paid to that


btw I am a sparky and in the past used to look after large traction batts ,and later a battery ( room ) to supply 2 mega watts for 15 mins ( ups for a banks main frame)
 
neoduder said:
I don't understand the HR bit at the end.

The 24AH bit tells you the capacity of the battery in Amp Hours. It basically means that if the current drawn from the battery is 24A then the battery will last 1 hour.
Click to expand...

I think it tells you the Discharge Time for which the quoted Capacity is 'true' (tested)

Ideally a 24Ah battery will last for 24hrs if the battery is providing 1A of constant current. In theory, if it were to provide 24A of constant current, then it would last for 1hr.

However this does not happen in practice and the discharge curve for most batteries is not linear.

Ideally a battery will provide a nominal voltage across the two terminals (eg 12V). In reality, some of this Voltage is 'lost' due to Internal Resistance. As the discharge current increases, then the voltage 'lost' across the Internal Resistance is greater (V=IR). So in general the more current you use to discharge the battery (ie the faster you discharge it), then the lower the true capacity.

So back to the OP...

brendy said:
When it comes to batteries I am virtually clueless, basically I am looking to find out which battery is the better spec,
12v 24ah 10hr
12v 24ah 20hr

Does the hr rating mean the battery can supply the given amp ratings for that amount of time?
Click to expand...

I believe they tell you the following:

12v 24ah 10hr

The battery is a 12V battery, that has a capacity of 24Ah.

This capacity is 'true' when discharged over 10hrs. The constant discharge current would be about 2.4A (24Ah/10h).


12v 24ah 20hr

The battery is also a 12V battery, that also has a capacity of 24Ah.

This capacity is 'true' when discharged over 20hrs. The constant discharge current would be about 1.2A (24Ah/20h).


So which battery is best?

Typically for most batteries the 'quoted' capacity is 'true' so long as the discharge current is no greater than the 'tested/quoted' current.

The first battery is basically saying that the capacity is 24Ah, so long as the 'average' discharge current is no more than 2.4A.

The second battery is basically saying that the capacity is 24Ah, so long as the 'average' discharge current is no more than 1.2A.

For this reason, I would conclude that battery 1 (12v 24ah 10hr) is the better battery, as it can provide a slightly higher 'average' discharge current before the 'quoted' capacity can no longer be expected.

Hope that helps :)
 
Div0 you big geek, Cheers mate, As I mentioned, I have the 10hr one and wasnt sure if bigger figures meant a better battery, thanks a bundle for clearing that up :)
 
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