Charging issue with Xantrex 2000

[lfeather]

My Xantrex sometimes says my two size 8D LifeLine AGM batteries are only 74‰ charged, even though my batteries are fully charged (as measured with meter at no load). It goes into absorption charge at 14.4 volts, 10-12 amps and "time left to charge" reads 00.00 on the remote. It may charge like this for maybe an hour or more. Anyone have this issue and a solution? TIA.

Larry, 03 Allure 30856

[lfeather]

gatorcq wrote:
The state of charge is depended on a few items.
1) how the internal shunt is connected
2) how many cycles (charge/discharge) you completed
3) whether or not your alternator is involved in the setup
4) whether or not solar is installed
5) the correct setup - better in the auto mode for battery capacity
6) fuel gauge cut out seting

Battery Capacity refers to the battery's reserve capacity in amp-hours. The RC7 approximates the battery state-of-charge (SOC) and run-time then estimates the battery capacity (Auto) over several charge/discharge cycles. However, setting the capacity manually assures a more accurate initial SOC and run-time calculations. The default setting is Auto.

The Fuel gauge Cutout menu sets the battery voltage zero percent state of charge (0% SOC) with no load. This is the point at which the battery has zero reserve amp-hours remaining. The Fuel gauge meter uses this number to determine the 0% battery state-of-charge voltage. The default is 9.5 VDC.

"However, setting the capacity manually assures a more accurate initial SOC and run-time calculations"

Interesting. Maybe I'll try the manual capacity setting. Thanks.

[wa8yxm]

pianotuna wrote:
Hi,

If you are using flooded batteries check the state of charge with a hydrometer.

Good answer however... HE STATED THEY WERE LIFELINE AGM, so no, they are not flooded batteries, they are starved batteries.


To the O/P: Check your charge profile.. The Xantrex units I know do not do auto-equalization like my Progressive Dynamics does, but... I do not know all that many Xantrex models.

Also, use a volt meter and a clamp on ammeter to double check, You could have a battery going south. Recently (Last winter) I had problems with my batteries holding a charge.. Some searching with a clamp on found one battery was sucking more than it's fair share of current.. Replacement fixed the problem (NOTE to others (not the O/P) If you have two six volt in series.. that is 1 12 volt battery for this post and all other practical situations)

[gatorcq]

The state of charge is depended on a few items.
1) how the internal shunt is connected
2) how many cycles (charge/discharge) you completed
3) whether or not your alternator is involved in the setup
4) whether or not solar is installed
5) the correct setup - better in the auto mode for battery capacity
6) fuel gauge cut out seting

Battery Capacity refers to the battery's reserve capacity in amp-hours. The RC7 approximates the battery state-of-charge (SOC) and run-time then estimates the battery capacity (Auto) over several charge/discharge cycles. However, setting the capacity manually assures a more accurate initial SOC and run-time calculations. The default setting is Auto.

The Fuel gauge Cutout menu sets the battery voltage zero percent state of charge (0% SOC) with no load. This is the point at which the battery has zero reserve amp-hours remaining. The Fuel gauge meter uses this number to determine the 0% battery state-of-charge voltage. The default is 9.5 VDC.

[chevyman2]

All sounds normal to me

[lfeather]

Thanks for all the inputs. Maybe I should leave it alone?

[dons2346]

Larry, I see on the CC site where you ask the same question. I'll give an answer here because someone else might benefit.

I had the same setup as you I think (Xantrex and RC7 controller and the 8D LifeLines) and mine did the same thing. I think it was a glitch in the system depending on when the controller sampled the voltage. I never worried about it after I watched the system for awhile.

[time2roll]

If 14.4 volts is pushing 10+ amps into those batteries.... they are not 100% charged.
All is normal.

[pianotuna]

Hi,

If you are using flooded batteries check the state of charge with a hydrometer.