High voltage alarm?

[Aleainc]

Hello! After being an long time lurker, finally joined this great community!

I am stumped on this one. Just pulled into my slip, plugged in shore power, and within a couple minutes the high voltage alarm goes off on the scheiber panel, reading 14.8v. My magnum charger display is reading the same, showing absorb charging. Using AGM settings. Nothing has changed and never had this alarm go off before? I am baffled, any ideas? .

[MikeHoncho]

I'd start with researching what your specific battery manufacture recommends for the max charge voltage and go from there. Not knowing your boat, I'd assume that the charger and battery monitor (where the alarm is coming from) is programmable to reflect the manufactures specs. All this being said, I'd also take a look at the external regulator on the alt to make sure it reflects the same specs.

[CharlieJ]

OP; what is a scheiber panel?

[CharlieJ]

OP: Dr. Google found the following forum and thread: https://jeanneau.proboards.com/threa...scheiber-panel

[Aleainc]

Thanks everyone. Yes it is a Scheiber panel. I also saw a few threads about this alarm but all reference the alternator, where this is on shore power. I understand if the upper charge voltage from the Magnum is just higher than the alarm setting on the Scheiber, but it’s just weird that it has never happened before. Would a change in the battery make it take a higher voltage? I figured the upper limit charge voltage would always be dictated by the charger controller.

[MikeHoncho]

is there a solar system installed? Might be the culprit with the 120volt charger going and a solar system with a lot of sun

[more]

Originally Posted by Aleainc

Thanks everyone. Yes it is a Scheiber panel. I also saw a few threads about this alarm but all reference the alternator, where this is on shore power. I understand if the upper charge voltage from the Magnum is just higher than the alarm setting on the Scheiber, but it’s just weird that it has never happened before. Would a change in the battery make it take a higher voltage? I figured the upper limit charge voltage would always be dictated by the charger controller.

ask here https://www.scheiber.com/nautisme?lang=en

[boatpoker]

I'd be concerned about battery temperatures and electrolyte levels (assuming LA) til' this is resolved.

[Aleainc]

AGM batteries, charger controller is the ubiquitous magnum me-rc, then the Scheiber panel has its own readout and alarm which is sounding.

I may have found the issue: The settings on the charger under the AGM program is 14.5v for Absorb. However, it adjusts for temperature. So in cold I guess it raises the voltage. It was around 40 degrees yesterday, so possibly this is the first time the batteries have been cold enough to warrant more voltage from the charger setting off the Scheiber alarm?

I don’t normally run in this weather, so the charger is in Float (lower voltage) when just plugged into shore.

Going to run a little heater near the batteries for a bit and see if the charger lowers the charge voltage.

[smac999]

14.8v -15v is totally normal when it’s cold out. And your charger has a battery temp sensor. Washington is Likly cold now.

If you unplug the temp sensor from the charger it will Likly drop back down. But it’s doing it’s job and I would leave it. And try to adjust the alarm.

[Whatta Life]

Attached is the recommended charge voltages based on temperature from East Penn. There is a chart for AGM and GEL. EP batteries are sold under many names, Deka, Duracell, West marine, Etc,

For 40-50 degrees F they recommend 14.8- 15.1v charging
For 40f and under 15.1-15.4v

You are lucky to have a temperature compensated charger, most are not. I always enjoy people who say they have a great charger but don't realize that it is not temperature compensating.