Battery Terminolgy

Submitted: Wednesday, Jan 19, 2011 at 19:36
ThreadID: 83758 Views:2080 Replies:3 FollowUps:1
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Why is it that when we discuss Battery Chargers capacity we refer to 4amps or 8 amps But when we refer to the capacity of an Alternator to charge we refer to Volts ie 14.8 etc. Why not apples to apples, you know what I mean?

See Ya ...............................jeff
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Reply By: dbish - Wednesday, Jan 19, 2011 at 19:44

Wednesday, Jan 19, 2011 at 19:44
Altenator sizes are in Amps Eg 80Amp. The volts are what the regulator is set to.
AnswerID: 442384

Follow Up By: Member - Trouper (NSW) - Wednesday, Jan 19, 2011 at 19:48

Wednesday, Jan 19, 2011 at 19:48
Thanks dbish............makes sense

see ya...jeff
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Reply By: dereki - Wednesday, Jan 19, 2011 at 21:28

Wednesday, Jan 19, 2011 at 21:28
Ill have a crack...

Very simply put. There are two factors when charging, voltage difference, and ability to deliver power. Volts and amps.

A mains charger regulates the voltage to be correct to charge your battery, but is limited in the number of amps it can produce (before the volts drop), more expensive units (bigger) can produce more amps at the correct charge voltage = faster speed of charge.

So, mains charger speed to charge your battery dependent on its amp output. (assuming that volts are static)

Alternators are usually pretty big 80+ amps, so amps is not really a consideration for charging, since 20amps is about as fast as you want to charge a 100Ah AGM battery. Volts are. Some regulators are set high = fast charge, others low = slow charging.

So its really just that we talk about the variable given the situation and assume the other one is fine.

AnswerID: 442392

Reply By: Bushranger1 - Thursday, Jan 20, 2011 at 08:12

Thursday, Jan 20, 2011 at 08:12
Hi Jeff,

This is how I explain electrical terminonlogy to people.

Volts/Amps explained

I was trying to type out my explanation but found it on the internet to save me taking half an hour to type it out for you. Poor typing skills here!
Hope this helps.

AnswerID: 442410

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