Thread: Alternator Charge Voltage Not Enough for Calcium Battery

Hi Lazbaz and welcome to AULRO.

Your battery can be fully charged with as little as 13.8v in a reasonable time.

But can be REGULARLY charge with up to 14.7v, and the higher the voltage the faster the charge.

Thats all the 14.7v charging means.

So no need for a new alternator, your will be fine.

Originally Posted by drivesafe

Hi Lazbaz and welcome to AULRO.

Your battery can be fully charged with as little as 13.8v in a reasonable time.

But can be REGULARLY charge with up to 14.7v, and the higher the voltage the faster the charge.

Thats all the 14.7v charging means.

So no need for a new alternator, your will be fine.

Thank you for your assurance. However this is what I read "The typical lead acid charging voltage is between 2.15 volts per cell (12.9 volts for a 6 cell battery) and 2.35 volts per cell (14.1 volts for a 6 cell battery). The ideal charging voltage for a calcium battery is 14.8V for the recombination process to properly occur"

So I am still unsure the battery will damage quite rapidly. I was thinking of getting the alternator voltage modified to 14.7 or 14.8 V. But I have not found anyone who can do it for me.

Personally I would be changing my battery choice instead of boosting the voltage to suit the battery type.
I am no auto sparky But it doesn't sound like a good idea to put that much extra voltage/ampage through an older vehicles aged wiring just to suit a different type of battery.

Many with later model Tojo’s boost the voltage using a diode,it’s very easy to do,with no issues,as the LC’s alternator generally runs lower charging voltage.They have a temperature compensation alternater,not a smart alternator.

As others have said,I would just leave it.

Originally Posted by lazbaz

I need a 14.7 V alternator regulator for the Bosch ERR 5834 alternator. Any advice how I can achieve this would be thankfully received.

There are a number of aftermarket external adjustable regulators for Bosch alternators. The car stereo guys use them to increase the output voltage.

I'm with Tim though in that you really don't need it.

Here's your reg : Regulator- adjustable. BOSCH sytems. – Motociclo
You just need to either remove your reg and wire this to the existing brush pack, or replace the brush pack with a compatible set. Something like : Dave's Volvo Page - Volvo Adjustable Voltage Regulators

Originally Posted by lazbaz

Thank you for your assurance. However this is what I read "The typical lead acid charging voltage is between 2.15 volts per cell (12.9 volts for a 6 cell battery) and 2.35 volts per cell (14.1 volts for a 6 cell battery). The ideal charging voltage for a calcium battery is 14.8V for the recombination process to properly occur"

So I am still unsure the battery will damage quite rapidly. I was thinking of getting the alternator voltage modified to 14.7 or 14.8 V. But I have not found anyone who can do it for me.

The standard battery for a D3/RRS is a calcium battery and I have never seen a charging rate as high as 14.7 or 14.8 in my RRS. On start it may show 14.2-14.4v until the start charge is recouped and it then drops to 13.2-13.5v and I have not had any issues with my calcium batteries over the years.

I think you are looking for an issue that is not there.

Originally Posted by 101RRS

The standard battery for a D3/RRS is a calcium battery and I have never seen a charging rate as high as 14.7 or 14.8 in my RRS. On start it may show 14.2-14.4v until the start charge is recouped and it then drops to 13.2-13.5v and I have not had any issues with my calcium batteries over the years.

I think you are looking for an issue that is not there.

Hi,
What battery do you have-full name? Mine is Hankook MF31-1000A.
How long have you had the battery for?
I am listening to what the forum members are saying and keeping an open mind.

Originally Posted by trout1105

Personally I would be changing my battery choice instead of boosting the voltage to suit the battery type.
I am no auto sparky But it doesn't sound like a good idea to put that much extra voltage/ampage through an older vehicles aged wiring just to suit a different type of battery.

Probably I will change battery but I have just bought this one.