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Old 03-17-2019, 09:47 AM   #1
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Sanity Check - battery voltage goes up to 15v

Hey guys:

Just want to make sure that I am not alone here. I noticed that on a clear sunny day, the battery voltage is about 15 volts. I have the lifeline agm batteries and the charging specs for the charge controller and inverter are set to Lifeline recommended settings. When the voltage is that high, both the charge controller and inverter are not pushing any amps into the batteries. From what I understand, 15 volts is equivalent to an equalize charge on lead acid batteries. I just want to make sure that the batteries arenít being cooked because of the higher voltage.

Thanks
Alex
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Old 03-17-2019, 10:38 AM   #2
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Absorption Charge: The 2nd stage of 3-stage battery charging. Voltage remains constant and current gradually tapers off as internal resistance increases during charging. It is during this stage that the charger puts out maximum voltage. Voltages at this stage are typically around 14.2 to 15.5 volts.
The 12volt Side of Life (Part 1)
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Old 03-17-2019, 10:42 AM   #3
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Do you not have the monitor that tells you with charge stage you are in? We have a Victron wireless monitor that we can check status on our phones and also inside at the control panel area.
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Old 03-17-2019, 10:45 AM   #4
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The charge controller is the one with Bluetooth. The charge controller is in float mode and the inverter/charger is also in float mode.
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Old 03-17-2019, 10:52 AM   #5
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Originally Posted by Shiba_Alex View Post
The charge controller is the one with Bluetooth. The charge controller is in float mode and the inverter/charger is also in float mode.
Maybe the charge controller is "set" to float mode, but 15 volts is not anywhere near float mode, which is generally in the low 13's. Since the solar controller is supplying 15 volts I am sure that the converter is backing off as far as it can go since it believes the bank is at 15 volts and doesn't need anything more.

If it stays at 15 for more than an hour or so, I would think that something is wrong with the controller setup.
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Old 03-17-2019, 11:02 AM   #6
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Iíll check the setup again. Again, this only happens on a clear sunny day. ďSunny dayĒ would point to the charge controller as the inverter wouldnít care if it is sunny or cloudy.

Not sure if it matters or not, but the solar setup is 600 watts total with 6 100 watt panels. There are 2 panels wired in series with three series sets in parallel. Open circuit voltage is about 44-45 volts and amperage is 5.75 volts on each series set.
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Old 03-17-2019, 11:07 AM   #7
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I don't have a fancy installed solar system, I just have a ZAmp portable 200w set and charge controller, but when it is set up on a sunny day and is giving its maximum voltage, the voltage is 15.1-15.5.
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Old 03-17-2019, 11:16 AM   #8
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15 volts is to high for your batteries. Don't let them charge that high.

Make sure your solar controller is not in equalize mode.
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Old 03-17-2019, 11:28 AM   #9
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Charge controller settings attached. Automatic equalization is disabled.
Click image for larger version

Name:	IMG_0754.jpg
Views:	40
Size:	98.4 KB
ID:	238394
Click image for larger version

Name:	IMG_0755.jpg
Views:	37
Size:	67.6 KB
ID:	238395
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Old 03-17-2019, 11:37 AM   #10
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You already know this, but that float voltage is too high.
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Old 03-17-2019, 11:46 AM   #11
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I turned off the charger settings on the inverter/charger and the voltage dropped down to 13.8. Iím guessing it is the inverter doing this. Iíll have to look at the battery settings on that.
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Old 03-17-2019, 12:30 PM   #12
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I looked at the manual for the inverter and I put the final charging stage to silent. I previously had it at float but the manual said that would be good if the inverter is the only charging point. The inverter should now only charge the batteries if the voltage goes down to 12.2 volts. The solar is now going to take over as the main charging source. The charging is back on and voltage is holding at 13.4 volts.
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Old 03-18-2019, 01:31 PM   #13
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Originally Posted by Shiba_Alex View Post
Charge controller settings attached. Automatic equalization is disabled.
Attachment 238394
Attachment 238395
In the above picture your temperature compensation for your solar controller is not set properly. Lifeline recommends 0.013v/degreeF for a 12v system. In Celsius (as yours is set) this should be -24.5mV/degreeC. Your inverter/charger may also have this wrong setting.
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Old 03-18-2019, 03:35 PM   #14
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I donít have a temperature sensor for the charge controller, but will get one. Iím not sure how to change the inverter settings. Thanks for the find.
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