nosliw

Hey,

I am in Europe and my battery is dead...
I have a 1993 Z28, I bought some adapters : https://www.camaroz28.com/forums/lt1...dapter-881706/

Now the question is about the minimum capacity of the battery. Here it is calculated in ah, 60 is it enough ?

Voltage [V]: 12
Battery Capacity [Ah]: 60
Cold Cranking Amps (CCA), EN [A]: 540

VARTA BATTERY D43 60AH BLUE DYNAMIC 540A 12V

Injuneer

The battery selected is more than adequate for the 525 cold cranking amps specified in the GM factory manual.

Cold cranking amps is a test run at -18*C (0*F). The current rating is the minimum amperage which must be maintained by the battery for 30 seconds, at the specified temperature, while meeting the minimum voltage requirement of 7.2 volts.

Have no idea of the significance of the amp-hour rating. The second rating specified in the factory manual is the reserve capacity rating. That is an estimate of the maximum length of time is it possible to travel at night with minimum electrical load and no alternator output. Expressed in minutes, it is the approximate time the fully-charged battery can support a 25-amp load without the battery terminal voltage dropping below 10.5 volts at 27*C (80*F), The factory battery label in the manual shows reserve capacity as 90 minutes.

The factory manual specifications sections also shows "Test Load Amps 260".

I'm just copying most of this out of the factory service manual. You can download a copy of the factory manual here:

LINK: 4TH GEN SERVICE MANUALS - Firebird Nation

nosliw

Many thanks for your answer.

The most important is the CCA to start the car ?

The ah or capacity reserve are only usefull in case of the alternator stop running, correct ?

For ah and capacity reserve I found that : Battery Confusion - Amp Hours vs. Reserve Capacity - SailNet Community

Injuneer

I would say that first you have to start the engine, and in cold weather, the amp demand can be large, and the battery's chemical activity low. I would meet that requirement first.

The article on RC vs amp-hour is interesting, but I'm a mechanical engineer, not an electrical engineer. I can't comment on the methods to equate RC to AH. But, if you take the "worst case" conversion, divide by two and add 16, the 90 minute RC becomes 90/2 + 16 = 61. That would appear to match the amp-hours of the battery you posted.

Note that the amp-hour rating seems to be very critical of "deep cycle" batteries, and conventional auto applications, unlike marine applications, do not require deep cycle,

nosliw

Thanks for your answer. I will order it and I let you know.