Battery replacement time

[sastanley]

alco, Like Dave mentioned, it may depend on where you are reading the voltage, and how they are being charged (simultaneously?) with the same charger, etc. I have a 'splitter' on my boat, the Gr24 starter is always up quicker than the 2 battery parallel wired Gr29 battery house bank.

[alcodiesel]

Thank you. Answers:
I am reading the V at the batteries.
The one charger is used for both batts.
They are within half a volt.

I went sailing on house only a couple of days ago, with the normal suite of electronic draw on, and upon return the V in the house was hardly noticeable on an analog meter. I count that a very good. Whereas the 3 ur old starter type batt. I used to have would have a noticeable discharge of a couple of V.

[alcodiesel]

Follow up:

The big battery (31) charges nearly the same as the smaller (24) one, The main reason for the differing voltages was the charging wire had disconnected at a fuse holder from the big batt.
I love simple solutions.

On another note: someone mentioned blue teeth battery monitor. Got 2 and, I don't know if it is necessary, but it's very cool keeping a close eye on batt. condition.

[alcodiesel]

Ok so I got the blue tooth battery monitors. The readings had been smooth line except when coming off shore power/starting engine/charging from alternator- you know a spike in draw or charging.

Then today I went out to the boat for a nap and take a look at the reading from the batt monitors. What is up with this? Is my charger unhappy? Trying to die possibly?

[alcodiesel]

Nothing? Neil? Dave? Joe?
Thank you,

[alcodiesel]

Nothing? Neil? Dave? Joe?
Thank you,

Bill McLean

[ndutton]

I don't have a battery monitor and no experience with a battery monitor so I have no business commenting on it. That's the problem with so many internet forums, big shot blowhards pontificating when they have no idea what they're talking about.

I hope you get your question answered and I have every confidence if it happens on this forum the answer will be correct and helpful.

[Dave Neptune]

I just used volt and amp meters. They gave me the info I wanted and I was not interested in counting amps.

What do the instructions indicate?

I like the KISS rule.

Dave Neptune

[joe_db]

Without knowing the resolution of the graph and sampling intervals I am not really sure I know what is going on. If the battery charger is the source of that I would say it was going nuts or it has some weird desulphation mode that kicked off.

[edwardc]

It appears to be pulsing up to ~14.4 V and then drifting back to ~ 13.1 V. Could this be how it implements Float mode? Normal float voltage is between 13.2 and 13.8, with 13.5 being commonly used. Or maybe it's probing to see when to go back into Bulk or Absorption mode? Or maybe the charger's bad? All speculation with no evidence or experience to back it up. My "gut feel" is that this is float mode but don't take that as gospel!

[joe_db]

It appears to be pulsing up to ~14.4 V and then drifting back to ~ 13.1 V. Could this be how it implements Float mode? Normal float voltage is between 13.2 and 13.8, with 13.5 being commonly used. Or maybe it's probing to see when to go back into Bulk or Absorption mode? Or maybe the charger's bad? All speculation with no evidence or experience to back it up. My "gut feel" is that this is float mode but don't take that as gospel!

I think a call to Marinco is in order.

[ndutton]

What is the time period between spikes?

[msmith10]

It looks irregular but 30 spikes in 16 hours, average every 0.53 hours.