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Chinese inverter discharges batteries without anything connected

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SolarPowerUser2022

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Joined
Aug 27, 2022
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Hello,
I have a chinese MPS-V-PLUS inverter. It is similar to many other chinese inverters. It has a blue display and four buttons like ENTER, Up, Down and ESC. I don't have anything connected to the AC outlet but the battery gets discharged and recharged everyday. What could cause this issue? I'm using a LiFEPo4 48v 120Ah battery.

These are my settings which I changed after I did a Factory Reset:

Charger source priority (16):
CSO (Solar first)
Output source priority (01):
SbU (1. Solar 2. Battery 3. Utility)
Bulk charging voltage / C.V voltage (26):
56v
Maximum charging current (02):
30A
Maximum utility charging (11):
2A
Low DC cut-off voltage (29):
48v
Setting voltage point back to utility source when selecting "SbU" or "SOL" in program 01 (12):
51v
Setting voltage point back to battery source when selecting "SbU" or "SOL" in program 01 (13):
jetzt 54v
Float charging voltage (27):
jetzt 54.1v
AC input voltage range (03):
APL (90-280VAC)
Backlight Control (20):
LOF
Click to expand...

Thank you very much!
 
Yes some of them use a stunning amount of power doing sweet fa. If you felt how warm it gets even sitting there staring at you?
 
There should be a switch to turn the inverter off so the inverter circuit will be off, the charge function will still be functioning.
 
Bud Martin said:
There should be a switch to turn the inverter off so the inverter circuit will be off, the charge function will still be functioning.
Click to expand...

And still pulling energy to support everything but the inverter. Your suggestion will lower the Tar load, but not eliminate it.
 
Solar Guppy said:
And still pulling energy to support everything but the inverter. Your suggestion will lower the Tar load, but not eliminate it.
Click to expand...
It will be in less than 100mA, easy enough to verify if that is your concerned, I have two AIO and i turn my off, and the charger will still keeps the batteries charge up, OP is wasting power when no load connected to the AC output of the inverter.
You cannot eliminate the draw unless you want the SCC to be disconnected too, you cannot eliminate current draw from battery unless you disconnect every thing including the BMS.
 
Mines are PIP-1012LV-MS (2 years old now) and MK (about 1 year old now).
Edit: I just check the current draw just now, at night and inverter's switch are OFF, both units draw about 10mA!
 
Last edited:
Likely in 60-80 watt range for idle power. You can probably measure about 1.5 amps battery draw with no load on inverter with a clamp-on DC amp meter.

With a 120 AH battery you have about 3 days of no-load idling.
 
Hi!
I understand that these Chinese inverters (Voltronic, etc.) have higher idle consumption.
But what's not fully clear to me and where I ask myself if nobody so far tried to find a solution for, is:
The Axpert is configured SBU.
Grid is connected and always stable available.
When during the night Low Voltage Cuttoff gets triggered, I would expect that all the loads and the Axpert's self-consumption get drawn only from utility and that there is no further discharge of the battery at all.
But what I observe is that Axpert switches immediately to utility when LowVoltageCutOff gets triggered (you here some relay-klicking inside) and starts to supply the loads. So far everything as expected.
But there remains a residual ~70W discharge of the battery. And this is nasty because it drives my LiFePo-pack in Undervoltage-Switch-Off from which it can only be woken up via manual restart.
So does anybody know, what inside the Axpert is consuming these 70 amps from Battery even after LowVoltafe-CutOff and why these 70A are not pulled from utility?
Is there anything one can do against this?
 
Last edited:
claus said:
Hi!
I understand that these Chinese inverters (Voltronic, etc.) have higher idle consumption.
But what's not fully clear to me and where I ask myself if nobody so far tried to find a solution for, is:
The Axpert is configured SBU.
Grid is connected and always stable available.
When during the night Low Voltage Cuttoff gets triggered, I would expect that all the loads and the Axpert's self-consumption get drawn only from utility and that there is no further discharge of the battery at all.
But what I observe is that Axpert switches immediately to utility when LowVoltageCutOff gets triggered (you here some relay-klicking inside) and starts to supply the loads. So far everything as expected.
But there remains a residual ~70A discharge of the battery. And this is nasty because it drives my LiFePo-pack in Undervoltage-Switch-Off from which it can only be woken up via manual restart.
So does anybody know, what inside the Axpert is consuming these 70 amps even after LowVoltafe-CutOff and why these 70A are not pulled from utility?
Is there anything one can do against this?
Click to expand...
this has -0- to do with chinese inverters..
this is behavior of all electric equipment, and as an all in one contains more function, it will have more self consumption
 
claus said:
Hi!
I understand that these Chinese inverters (Voltronic, etc.) have higher idle consumption.
But what's not fully clear to me and where I ask myself if nobody so far tried to find a solution for, is:
The Axpert is configured SBU.
Grid is connected and always stable available.
When during the night Low Voltage Cuttoff gets triggered, I would expect that all the loads and the Axpert's self-consumption get drawn only from utility and that there is no further discharge of the battery at all.
But what I observe is that Axpert switches immediately to utility when LowVoltageCutOff gets triggered (you here some relay-klicking inside) and starts to supply the loads. So far everything as expected.
But there remains a residual ~70A discharge of the battery. And this is nasty because it drives my LiFePo-pack in Undervoltage-Switch-Off from which it can only be woken up via manual restart.
So does anybody know, what inside the Axpert is consuming these 70 amps even after LowVoltafe-CutOff and why these 70A are not pulled from utility?
Is there anything one can do against this?
Click to expand...
How do you see or measure that 70A still being drawn from the battery when the unit is in the Low Voltage shutdown and switched to utility mode which at that point the utility should be charging the battery until the battery Voltage reaches the 'Back to battery source' set point?
 
I see it from my JBD-BMS monitoring and I can measure it on the Battery cables w/ Clamp-Meter (approx. 1.5A).
 
claus said:
I see it from my JBD-BMS monitoring and I can measure it on the Battery cables w/ Clamp-Meter (approx. 1.5A).
Click to expand...
'But there remains a residual ~70A discharge of the battery.'
So where did you see the 70A draw?
 
claus said:
I see it from my JBD-BMS monitoring and I can measure it on the Battery cables w/ Clamp-Meter (approx. 1.5A).
Click to expand...
I think you mean 70w draw. 1.5a X 48v = 72w

Yes there is draw on the battery from the AIO so long as it is connected to battery. I ran a test on my EAsun spare unit last night running in Eco, or low power mode, and confirmed the ~50w that the operations manual lists as spec.

When pondering design of an AIO and the practicalities of how to run power free, or a bare minimum, you encounter issues of power interruption. Switching AC is fairly easy but DC is not due to arc protection.
 
I'm so sorry this was a typo! I corrected my post! Please excuse me!
I see a residual discharge of 70W on the BMS, which equivalents to 1.5A I measure on the battery cables.
And to make it a little bit more clear.
It's not a problem that the Axpert has an idle consumption of ~70W ... this is the price I'm willing to pay for cheaper all-in-one.
But the problem is, that it draws these 70W from Battery even after LowVoltageCutOff kicked in, where it should draw it from grid.
 
claus said:
I'm so sorry this was a typo! I corrected my post! Please excuse me!
I see a residual discharge of 70W on the BMS, which equivalents to 1.5A I measure on the battery cables.
And to make it a little bit more clear.
It's not a problem that the Axpert has an idle consumption of ~70W ... this is the price I'm willing to pay for cheaper all-in-one.
But the problem is, that it draws these 70W from Battery even after LowVoltageCutOff kicked in, where it should draw it from grid.
Click to expand...
No method to draw from grid unless you charge from grid. AIO would need to convert AC to DC.

ETA: These units run on DC and when you think about it that is necessary because they are off grid capable.
 
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