Hi all,

Question: Is it normal to experience flickering of all lights in the house during the second or so that the inverter switches between battery and grid source output modes? 
The flickering occurs even under low total load.

Additional info:
I have a combination of incandescent bulbs and LED lights in the house.

There is a single geyser and stove that runs directly from the grid on separate circuits, not via the inverter

I include pictures and some setting and specs from the software, hopefully it is of some help.

System consist of 1x battery, 6x solar panels connected to a single inverter

RCT-AXPERT 5K Inverter 

PYLONTECH US2000 48V 2,4KWh Lithium-Ion battery (Part nr: US2000NB02V00201)
 

Software settings and specs:
Driver: Axpert
Monitoring connection: Direct cable
Machine type: Off Grid
Topology: Transformerless
Max parallel units: 9 units
Nominal battery voltage: 48.0 V
Expected AC input voltage: 230.0 V
Max AC input current: 21.7 A
Max AC output apparent power: 5000 VA
Max AC output current: 21.7 A
Max AC output power: 4000 W

Battery settings
Battery type: User
Charger source priority: Solar first
Shutdown battery voltage: 46.8 V
To grid battery voltage: 47.0 V
Back to battery voltage: 49.0 V
Battery float charge voltage: 53.2 V
Battery bulk charge voltage: 53.2 V
Max charge current: 60 A
Max AC charge current: 10 A

Input/Output settings
Output mode: Single machine output
AC Input voltage range: Appliance
AC output frequency: 50.0 Hz
AC output voltage: 230.0 V
Output source priority: Solar/Battery/Utility
Overload bypass: Enabled
Overload restart: Enabled
Primary source interrupt alarm: Disabled

 

10 hours ago, brand2000 said:

Is it normal to experience flickering of all lights in the house during the second or so that the inverter switches between battery and grid source output modes? 

I don’t think flickering of lights is normal, my own lights make a slight flick when changing over.

 

10 hours ago, brand2000 said:

Max charge current: 60 A

I noticed the 60A is your inverter set to charge the pylontech at 60A? if so, I think it’s to high for a US2000 it should be set at 25A the same as recommended discharge current, otherwise you might shorten the battery lifespan.

1 hour ago, Gerrie said:

I don’t think flickering of lights is normal, my own lights make a slight flick when changing over.

 

I noticed the 60A is your inverter set to charge the pylontech at 60A? if so, I think it’s to high for a US2000 it should be set at 25A the same as recommended discharge current, otherwise you might shorten the battery lifespan.

Would you say this flick you experience affects other devices in the house like electronics/fridges in any sort of negative way? It does not SEEM healthy.
I will have a look the 60A setting, if indeed it is set to that.
Thanks for answering!

One US2000 is very light for this setup; that won't be helping.

That model with the heatsink on top is getting quite old. I get the feeling that the relays in these Axperts take a pounding, and the contacts may be pitted.

You could also check that you are using UPS AC input range; that will halve the changeover time.

Your battery voltage settings (53.2 V) are far too high. Yes, it's what Pylontech recommends, but it's too high for the Axperts that overshoot their targets. The battery will be disconnecting at times, probably contributing to wobbly changeovers. Search this forum for better Pylontech settings for Axperts.

Edited August 9, 20215 yr by Coulomb

I am not sure exactly what to change. Would you suggest changing both these settings under battery to the following? What else?

Max charge current: 60 A  --->  30/40A

Max AC charge current: 10 A  ---> 30A

 

Appreciate the help!

21 hours ago, brand2000 said:

Max charge current: 60 A  --->  30/40A

Max AC charge current: 10 A  ---> 30A

Yes, 30 A for both of those, and the voltages as per this messy image.

On 2021/08/08 at 9:48 PM, brand2000 said:

Would you say this flick you experience affects other devices in the house like electronics/fridges in any sort of negative way? It does not SEEM healthy.

I’m sure most inverters will have a slight dimming or brightening of lights when the inverter switches between modes due to the voltage difference of grid and inverter power as well as that milli-second switchover duration. My own system been going fine for a few years now and I see the switchover every night with my led lights as my system switches over on a timer setting. The problem however of flickering could be a result like Coulomb mentioned if the relays in the inverter had some excessive wear and tear. I think that type of flicking on and off could possibly cause damage to hard drives and equipment sensitive to surges.

On 2021/08/08 at 10:22 AM, brand2000 said:

Hi all,

Question: Is it normal to experience flickering of all lights in the house during the second or so that the inverter switches between battery and grid source output modes? 
The flickering occurs even under low total load.

Additional info:
I have a combination of incandescent bulbs and LED lights in the house.

There is a single geyser and stove that runs directly from the grid on separate circuits, not via the inverter

I include pictures and some setting and specs from the software, hopefully it is of some help.

System consist of 1x battery, 6x solar panels connected to a single inverter

RCT-AXPERT 5K Inverter 

PYLONTECH US2000 48V 2,4KWh Lithium-Ion battery (Part nr: US2000NB02V00201)
 

Software settings and specs:
Driver: Axpert
Monitoring connection: Direct cable
Machine type: Off Grid
Topology: Transformerless
Max parallel units: 9 units
Nominal battery voltage: 48.0 V
Expected AC input voltage: 230.0 V
Max AC input current: 21.7 A
Max AC output apparent power: 5000 VA
Max AC output current: 21.7 A
Max AC output power: 4000 W

Battery settings
Battery type: User
Charger source priority: Solar first
Shutdown battery voltage: 46.8 V
To grid battery voltage: 47.0 V
Back to battery voltage: 49.0 V
Battery float charge voltage: 53.2 V
Battery bulk charge voltage: 53.2 V
Max charge current: 60 A
Max AC charge current: 10 A

Input/Output settings
Output mode: Single machine output
AC Input voltage range: Appliance
AC output frequency: 50.0 Hz
AC output voltage: 230.0 V
Output source priority: Solar/Battery/Utility
Overload bypass: Enabled
Overload restart: Enabled
Primary source interrupt alarm: Disabled

 

I get flickering on some lights when it switches from solar priority to Grid. SO at sunset it flickers as it jumps between grid and the last of the sunshine. I personally do not like flickering. One LCD monitor flickers, but nothing else. I just hear the clicking.