Split charge voltage at rest?

G

Gunscrossed

Active Member

Posts

132

• Mar 4, 2018

• #1

At rest my batteries show about 12.5v, is that OK?

 

K14

Well-Known Member

Posts

358

Location

Suffolk

• Mar 4, 2018

• #2

With the ignition on yes, as you get a bit of a voltage drop. If your concerned turn off ignition and test batteries with a meter, you will find the reading a bit higher.

 

G

Gunscrossed

Active Member

Posts

132

• Mar 4, 2018

• #3

That is with the ignition off.

 

ogb

Active Member

Posts

289

Location

Moray, NE Scotland

• Mar 8, 2018

• #4

Look OK to me. I'd expect them to show about 13.5 to 14.0 with the engine running and the level in the pic after about 15 minutes of switch off (maybe quicker, haven't ever put a clock on it).

 

G

Gunscrossed

Active Member

Posts

132

• Mar 8, 2018

• #5

Thank you!

 

Larry365

Active Member

Posts

558

Location

Lincolnshire, UK

• Mar 13, 2019

• #6

Can't see the pic but depending on your system, the aux battery will continue to draw from the main battery until voltage set on split charge is met (usually ~12.6v). So if your aux needs charging, your main battery will continue to charge the aux even with the engine off. Your main battery will then show 12.6v at rest. The aux battery wont charge until main battery is over something like 13.5v. Make sure you are testing when everything is fully charged.