Continue to Site

# 12V car alternator charging a 12V lead acid battery

Status
Not open for further replies.

#### fantabulous68

##### Member
Does anyone have a circuit diagram for a charging circuit--->

12V car alternator charging a 12V lead acid battery.......

I want to cut down the electricity bill
The charging circuit will be connected to an inverter that gives an output of 240V AC.

#### kchriste

##### New Member
Forum Supporter
Usually the alternator comes with a built in regulator. If it doesn't have one, you could pick one up at an auto wrecker for cheap. What are you going to turn the alternator with? They require quite a high RPM to give any decent output.

#### fantabulous68

##### Member
What are you going to turn the alternator with?
Will use a 220V electric motor to turn the alternator with regulated rpm

#### magickaldan

##### New Member
And unless your able to run the electric motor for free then you won't save on any electricity.

#### fantabulous68

##### Member
And unless your able to run the electric motor for free then you won't save on any electricity.

regulator from van charges battery------>12V battery drive inverter--->inverter drives motor----->electric motor drives alternator----->ac alternator 220V output

#### blueroomelectronics

##### Well-Known Member
Every stage will lose energy via heat. You'll only get a percentage of the original power you put into it.

#### tcmtech

##### Banned
Gosh I wish schools would start teaching basic practical math and science again.
I really miss the common sense it instills in people.

#### smanches

##### New Member
regulator from van charges battery------>12V battery drive inverter--->inverter drives motor----->electric motor drives alternator----->ac alternator 220V output

Why not just pull your 220 off the first inverter? This chain doesn't make sense.

#### deepak george

##### Member
dude....u have to get ur basics right....u cannot continue otherwise

#### fantabulous68

##### Member
yikes im never going to ask a question on behalf of someone else again.

Last edited:

#### magickaldan

##### New Member
Here's what you could do, but won't really save you any on electricity. Use alternator in Van to charge up a battery while driving, then use an inverter off the battery to get your 220v. Or if you didn't have an inverter you could get a 12v motor, hook it up and spin a 220v generator alternator. Still your paying for the electricity in the gas your using.

#### deepak george

##### Member
hey, its okay fantabulous. even the most experienced guys out there do make mistakes....and making mistakes is the best way to learn...and where is a better place than the forum to make mistakes? where you have experienced people helping you out...so you can always learn from them...dont worry at all...and if its your friend who posed the question, tell him to join the forum too and ask his doubts himself, so he learns too....

cheers,
deepak

#### spindrah

##### New Member
Will use a 220V electric motor to turn the alternator with regulated rpm

dude, this is a really good idea because you will get more power out of it, your overall power will be dependant on how big and powerfull your last stage is!!

=$1/KWH to move it through a battery! Oh wait... that's 4x/10x more than the wall power would have cost, even if I can charge it for nothing at all. #### magickaldan ##### New Member Not only is the extra gasoline used more expensive than the cost of the energy in the battery, the cost of a lead-acid battery which is good for a few hundred cycles if it's a deep-cycle type is vastly more expensive than wall power even IF you had a free source of energy to charge it. 1KWH=$0.10 in cheap parts of USA. Say it's $0.25 in Europe or somewhere. Deep cycle battery=$120, 12v/50AH usable=0.6KWH. Say it lasts for 200 cycles (that's quite a lot for lead-acid). Can move 120KWH over its entire life.
=\$1/KWH to move it through a battery!

Oh wait... that's 4x/10x more than the wall power would have cost, even if I can charge it for nothing at all.

200 cycles isn't that much for a Deep Cycle battery, now for a regular Lead Acid yea that's ALOT. If maintained a Deep Cycle can expect over 350+ Cycles, and really depends on the brand.

Status
Not open for further replies.

Replies
23
Views
6K
Replies
0
Views
3K
Replies
4
Views
4K
Replies
4
Views
2K
Replies
8
Views
6K