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Pylontech US2000B recommended charge/discharge parameters

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I have got 4 Pylontech batteries currently going into my Solax 3.7kw Hybrid inverter.

I would like some info on recommended charge/discharge parameters, the manual only gives a general guide.

Its currently set to 

Lithium

Min Capactity 20%

Charge Cut Voltage 53.5

Discharge cut voltage 47

Max charge current 50A

Max Discharge current 50A

Are these parameters ok or do you recommend i adjust them? 

 

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The Pylon tech settings for the Axpert is  charge cut off 53.2V discharge cutoff 47.5V  Max charge rate for 4 Pylontechs 100A max discharge 100A.  I have noticed that the  Goodwe also charges at  0.4C (your current charge/discharge rate) so I would go with the Solax - Pylontech recommendations. 

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On 2018/10/12 at 2:57 PM, Chris Hobson said:

The Pylon tech settings for the Axpert is  charge cut off 53.2V discharge cutoff 47.5V  Max charge rate for 4 Pylontechs 100A max discharge 100A.  I have noticed that the  Goodwe also charges at  0.4C (your current charge/discharge rate) so I would go with the Solax - Pylontech recommendations. 

If you don't mind me asking. What settings would you recommend for a Infinisolar 4KW super inverter? I have 16x 325W solar panels and 3x Pylontech batteries and use Eskom during the night. 

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1 hour ago, AndewJ said:

If you don't mind me asking. What settings would you recommend for a Infinisolar 4KW super inverter? I have 16x 325W solar panels and 3x Pylontech batteries and use Eskom during the night. 

I'd assume you'd use the same settings? 25A per rack (that's roughly C/2), and you have three of them, so 75A total. Voltages remain the same, the battery wants to be charged to 53.2V.

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13 minutes ago, plonkster said:

I'd assume you'd use the same settings? 25A per rack (that's roughly C/2), and you have three of them, so 75A total. Voltages remain the same, the battery wants to be charged to 53.2V.

I am looking for the recommended voltage settings since mine seems to not work correctly. 

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45 minutes ago, AndewJ said:

I am looking for the recommended voltage settings since mine seems to not work correctly. 

The charge voltage is 53.2V. This is also what it publishes on canbus (for those inverters that support it), but for those that don't, that is what you should set up. LFP batteries don't have a "float" voltage, you simply keep it at that voltage indefinitely, so set absorb and float to the same (or close) value (I think the Axpert documentation incorrectly calls it the "bulk" voltage instead of the absorption voltage).

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HI,

Can I throw a followup on this thread - working hard to climb the practical learning curve and don't want my batteries to suffer in the process.

My inverter I set to 53.2V float and absorb per the recommended figures.

What I find is that my Pylon batteries go to "idle" - i.e. no lights except the single one that blinks.  But the inverter keeps about 0.4-0.6A charging current flowing; it reports the battery voltage at 53.2v and says it is "floating" the batteries.

Like here for instance:

  "InverterTime":"20181219082748",
  "GridVolts":221.8,
  "GridWatts":-62,
  "GridHz":50.0,
  "BatteryVolts":53.2,
  "BatteryPercent":100,
  "BatteryChargeMode":"F",
  "BatteryChargeAmps":0.5,

Should it run like this continuously - its only 25W or so, but it does cause the fans to turn on and off all the time as the inverter gets warm.

I guess its called "float" so it will just stay on continuously?

Based on the lack of SOC lights on the batteries I don't think that power is actually going into the cells.

(Remember I don't have PV so I'm paying for all the power I use)

There is a setting in the software to turn off the charger once the current has been stably low for a period.  Is it a bad idea to use this to turn off the charger and then only turn it on again when the battery voltage goes below a threshold?  The power goes down in the battery slowly so it might be enough just to top them up once a week if they aren't being used?

Does this count as a "cycle"?  My guess is that it would depend on the battery BMS actually charging cells.

If I turn off the charger in the inverter then the battery voltage gradually drifts down so it doesn't seem like batteries make 53.2 by themselves.  (There's no load on the batteries so it can't be cable resistance).

Thanks,
Elbow

 

 

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Posted (edited)

Good day,I have 2 x Pylontech US2000 in parallel.The "Master add dip switch 1 is on and the other 3 is off",The "Slave add dip switch is all off".Is that correct, then the Master has a alarm LED.What and how can I check what is wrong and how can I correct it?

Sorry I forgot the inverter is AXPERT 5kW

Edited by Solarsmit

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