Xantrex Custom Charge Settings

[Ronbrink]

As some may recall, I have dealt with an issue regarding the ‘charging aspect’ of my Xantrex XC 2000; specifically its’ inability to keep my LFP battery bank at full charge when in storage on shore power. When first powered up, the Xantrex will provide an initial charge cycle, but thereafter no further charge maintenance; thus requiring a weekly visit to the Cow Barn to manually instigate another initial charge cycle to bring the bank up to par. In talking with a Xantrex tech on this matter back when, I was told the unit was likely defective and in need of replacement. No bueno! Since no issues with the ‘inverter aspect’ I opted to install an independent dedicated Cerbo/charger combo to satisfy my charging needs, which has been working great! Problem solved, right? Here’s a recent observation!

In looking at the following chart provided upon request by Oliver, notice in particular Settings 20, 22 and 23. (Disregard the text statement at the bottom of chart).


 

This chart is representative of most I’ve seen, updated to address the various recommended Xantrex settings for both Oliver models per battery type. However, I recently learned why Settings 22 and 23 are blacked out and that a charging profile can be customized via these settings, following a change in Setting 20. When scrolling through Setting 20, I selected USE (User defined) rather than LFP(LiFePo), as illustrated above. In doing so, I was then able to access Settings 22 (Custom Absorption Voltage) and 23 (Custom Float Voltage). In general, most LFP manufacturers will have an absorption value ranging from 14.2-14.6 volts; a float value may or may not be provided since not really needed for that battery type. Given I now have LFPs, the custom values entered in my application were 14.6 and 13.6, respectively. 
 

As best I can tell, making the above changes to these three settings caused the ‘charging aspect’ of my Xantrex to operate as designed. My battery bank has been maintained at 100% for the past several weeks since, which is in keeping with claim that the Xantrex ‘uses a multistage charging process to keep batteries at full charge when connected to shore power’. Go figure!

 

[jd1923]

3 hours ago, Ronbrink said:

I selected USE (User defined) rather than LFP (LiFePo), as illustrated above. In doing so, I was then able to access Settings 22 (Custom Absorption Voltage) and 23 (Custom Float Voltage). In general, most LFP manufacturers will have an absorption value ranging from 14.2-14.6 volts; a float value may or may not be provided since not really needed for that battery type. Given I now have LFPs, the custom values entered in my application were 14.6 and 13.6, respectively. 

This is also true with the Victron MP2 setup where "User Defined" allows you to manually set charge rates to battery manufacturers' specifications. For Epoch batteries, the Absorbtion rate is 14.2V and Float 13.6V.