Parallel vs Series Charging

[KiKaZz74]

So can u do any old battery or do they make special 24v batteries?

[SnowDrifter]

So can u do any old battery or do they make special 24v batteries?

You can wire any (2) 12 volt batteries wired in series to get 24 volts. But they have to be the same battery and in similar condition.

Out of curiosity: what are you doing with 24v?

[KiKaZz74]

So can u do any old battery or do they make special 24v batteries?

You can wire any (2) 12 volt batteries wired in series to get 24 volts. But they have to be the same battery and in similar condition.

Out of curiosity: what are you doing with 24v?

So then y if u over charge a battery it can swell but charging it in series won't? I'm curious on all this now too

[KiKaZz74]

So can u do any old battery or do they make special 24v batteries?

You can wire any (2) 12 volt batteries wired in series to get 24 volts. But they have to be the same battery and in similar condition.

Out of curiosity: what are you doing with 24v?

So then y if u over charge a battery it can swell but charging it in series won't? I'm curious on all this now too

[SnowDrifter]

So can u do any old battery or do they make special 24v batteries?

You can wire any (2) 12 volt batteries wired in series to get 24 volts. But they have to be the same battery and in similar condition.

Out of curiosity: what are you doing with 24v?

So then y if u over charge a battery it can swell but charging it in series won't? I'm curious on all this now too

Who said anything about it not swelling in series? Any time you charge a battery at too-high a voltage it will gas and swell.

[KiKaZz74]

So how do u change a 24v series bank? Like say a locomotive runs on 72v are those special batteries or what? How do u change a series bank of 12v batteries?

[SnowDrifter]

So how do u change a 24v series bank? Like say a locomotive runs on 72v are those special batteries or what? How do u change a series bank of 12v batteries?

Just like a 12 volt battery but double the voltage

You are overthinking this way too much lol

Battery101:

- Batteries are composed up of individual "cells" which, as a rule of thumb, need to be charged at 2.3-2.4 volts.

- Battery cells have a nominal voltage of 2v. So 12v/2=6. 6 cells for a 12v battery. And 24/2=12 cells for a 24 volt battery

- A 12 volt battery has 6 of these cells wired in series. 2.3*6 is 13.8v and 2.4*6 is 14.4v.

- A 24 volt battery has 12 of these cells wired in series. So instead of multiplying the cell voltage by 6, you need to multiply it by 12. I'll let you do that so you learn a little

Now whether you have 12 of these cells wired together in 1 battery have 2, 6 cell batteries wired together makes no difference.

It's JUST like a 12 volt battery. But because there are double the cells, all your voltages are doubled too

[STEvil]

You can charge series at 24v because the batteries (multiples of 2 for 24v) in series connection puts all the internal cells (a battery is actually many smaller batteries together) in series (2+2+2+2+2+2 + 2+2+2+2+2+2 = 24).

1 battery: 12 volts.

2 batteries series: 24 volts

2 batteries parallel: 12 volts

3 batteries series: 36 volts

3 batteries parallel: 12 volts

4 batteries series: 48 volts

4 batteries parallel: 12 volts

4 batteries series/parallel: 24 volts

etc...

I left out a few configurations but dont worry about them.

edit - sniped.

edit 2

As to the reason for swelling, its because you create heat and chemical reactions within the battery (this can cause them to swell, melt, or explode) when you charge them. Charging at 2.3 or 2.4 volts per cell is pretty safe but getting up over that for longer periods of time or on older batteries will cause failures in many "average" quality batteries. SO if you are charging a single 12v battery then 13.8-14.4 volts is ok. If you run two batteries in a series connection for 24v then your limit is about 27.2-28.8v. If you run two batteries in parallel you are stuck again at 13.8-14.4v.

[shackleford]

what happens is THIS

when you go series you drop voltage across loads. so lets say you have some 2 ohm 6.5"s rated for 40wrms and you were to wire them in series at 4 ohms and feed them 80w. this would give you 17.89VAC and 4.47 A of current. now when this goes across the speakers in series each is going to see ~8.95VAC and 4.47a. <<<<<<THIS is 40W into 2 ohms

no when you paralell its the opposite lets say those were 8 ohm speakers and you fed them the same 80w at 4 ohms. your amp would put out the same 17.89VAC and 4.47A but instead each speaker would see 17.89VAC and 2.24A <<<<<<<THIS is 40W at 8 ohms.

now lets make these speakers batts and you paralell them your going to gain A but when in series youll gain VDC

hopefully this takes all the dumbshit out of having to wrap your brain around this topic as NONE of these replies explained what your asking.

[SnowDrifter]

what happens is THIS

when you go series you drop voltage across loads. so lets say you have some 2 ohm 6.5"s rated for 40wrms and you were to wire them in series at 4 ohms and feed them 80w. this would give you 17.89VAC and 4.47 A of current. now when this goes across the speakers in series each is going to see ~8.95VAC and 4.47a. <<<<<<THIS is 40W into 2 ohms

no when you paralell its the opposite lets say those were 8 ohm speakers and you fed them the same 80w at 4 ohms. your amp would put out the same 17.89VAC and 4.47A but instead each speaker would see 17.89VAC and 2.24A <<<<<<<THIS is 40W at 8 ohms.

now lets make these speakers batts and you paralell them your going to gain A but when in series youll gain VDC

hopefully this takes all the dumbshit out of having to wrap your brain around this topic as NONE of these replies explained what your asking.

Ummmm..... WHAT?