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MPPT60 Absorption Charge
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whatwatt View Drop Down
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Joined: 26 March 2009
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Posts: 2 		  Quote whatwatt Quote  Post ReplyReply Direct Link To This Post Topic: MPPT60 Absorption Charge
    Posted: 13 April 2009 at 11:59am
I have been getting to know a pair of XW-MPPT60-150 charge controllers. I have the absorption time for both units set to 120 minutes, and the bulk/absorption levels set to 58.8 volts.   I've seen "absorption" as a charge state, even when the battery bank voltage is down at 52+ volts.

I'm from the Land of Outback. I'm used to an "honest" absorption stage.

Absorption doings in Xantrex Land are beyond baffling and entirely different. Does anyone have a technique to actually accumulate those 120 minutes, at the "set" absorption level?

Xantrex tells me that Absorption begins when gassing occurs. I have not found the "gassing sensor" yet and the concept of serious gassing down at the 52 or 53 volt level is... amusing.

Perhaps I could try to obtain the high voltage level "gassing" time by doing an equalize every week?

How are you going about achieving a solid absorption charge every day that offers good solar?
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Dave sparky View Drop Down
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Posts: 361 		  Quote Dave sparky Quote  Post ReplyReply Direct Link To This Post Posted: 13 April 2009 at 12:05pm
Set the amp hours of your battery bank to zero in the battery screen. This will give you the time that you entered. If you can measure SG on your battery then you can dial it all in. I think this will be fixed in the next XWCC manual.

The algorithm goes from bulk to absorb the first time the CC see's float voltage that day. So, if loads or clouds bring you below float voltage you will still see absorb. It is different than Outback but works just as well.

Edited by Dave sparky - 13 April 2009 at 12:09pm
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Solar Guppy View Drop Down
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Posts: 145 		  Quote Solar Guppy Quote  Post ReplyReply Direct Link To This Post Posted: 13 April 2009 at 4:04pm
There is a bug in the charger code that the unit goes into absorb at the float voltage ... I came across this is some recent testing. Xantrex has a fix for this alone with some enhancements, I believe its version 01-05-00 ( current one is 01_04_00 dated 10/24/08 )

Call support and I'm sure they would provide you the firmware for an update
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Dave sparky View Drop Down
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Posts: 361 		  Quote Dave sparky Quote  Post ReplyReply Direct Link To This Post Posted: 14 April 2009 at 6:25am
Is that the one below SG?



Firmware XW MPPT SCC 865-1030.01_04_00.BN0004.zip 2/9/2009 261 KB
Firmware XW SCP 865-1050.01_02_00.BN0006.zip 10/10/2008 721 KB
Firmware XW4024 865-1045.01_03_00.BN0020.zip 11/14/2008 484 KB
Firmware XW4024 865-1010.01_04_00.BN0002.zip 2/9/2009 491 KB
Firmware XW4548 865-1040.01_03_00. BN0010.zip 11/14/2008 485 KB
Firmware XW4548 865-1005.01_04_00.BN0015.zip New!
3/23/2009 488 KB
Firmware XW6048- 865-1000.01_03_00.BN0012.zip 10/10/2008 490 KB
Firmware XW6048 865-1035.01_00_00.BN0029.zip 11/14/2008 481 KB

http://www.xantrex.com/support/web/type/21/docldoc_type.asp
   
      


Edited by Dave sparky - 14 April 2009 at 6:32am
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Solar Guppy View Drop Down
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Posts: 145 		  Quote Solar Guppy Quote  Post ReplyReply Direct Link To This Post Posted: 14 April 2009 at 8:43am
Originally posted by Dave sparky

Is that the one below SG?


Firmware XW MPPT SCC 865-1030.01_04_00.BN0004.zip 2/9/2009 261 KB
      


No , the one with the fix will be *01_05_00*
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Dave sparky View Drop Down
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Posts: 361 		  Quote Dave sparky Quote  Post ReplyReply Direct Link To This Post Posted: 14 April 2009 at 10:08am
Thanks!
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Dave sparky View Drop Down
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Posts: 361 		  Quote Dave sparky Quote  Post ReplyReply Direct Link To This Post Posted: 14 April 2009 at 10:23am
SG,
That was the firmware that added float time also correct?
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Solar Guppy View Drop Down
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Posts: 145 		  Quote Solar Guppy Quote  Post ReplyReply Direct Link To This Post Posted: 14 April 2009 at 11:52am
Not sure what versions added features, I know the 05 one does have the float timer if that helps ...
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