Replies: 18 comments 21 replies
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Here comes a screenshot showing a set of entities on one single screen illustrating my problem. |
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I selected a few more/other battery parameters and made a new screendump. Here I think you can see what happens. The battery seems to "leak" some energy even when I have set charge/discharge power to 0 during the long period in TOU (Time of use) mode. You notice the battery bus current is -0.1 A a significant part of this time. The explains why I end up with some battery discharge during a day even if my intention was to keep the battery idling. However, this just seems to happen in TOU mode. During "Fully fed to grid" the battery seems to behave differently. Or maybe this is dependant on charging level.
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I've observed the same behavior in my installation. My theory is that keeping the battery and/or inverter online costs a significant amount of energy. You can also see this when looking to the efficiency charts of the inverter: when producing less than 5% of it's maximum power, the efficiency falls into a cliff, probably due to the non-negligible constant cost in terms of power consumption. Sadly, I have not found a solution to put the battery into a proper standby mode to prevent this discharging from happening. |
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Thank you for the stacktrace, a last minute change before the release of 1.2.0 beta 2 contained a small error. It's been corrected in 1.2.0 beta 3. |
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When creating this integration, I decided to only use the registers that refer to both batteries at once (eg. prefixed by |
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Ah, Ok! That's probably fine, I just missed that one was available. I've been running the on/off switch a few times back and forth last few days and it seems to work fine! Only issue seems to be the Huawei-related one (where the battery sometimes goes from Offline to Standby and thereby consumes a bit of energy). |
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Just FYI: switching the inverter on and off will physically trigger some relays and can cause short voltage peaks in some components while everything gets started up/shut down and leveled out. This will cause wear on these components, and can lead to premature failure of the inverter. I would therefore advice against excessive use of that feature. (I'm not an expert in this matter, but my engineering background tells me that it's best to mention this) |
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Should be fine as long as no current is flowing over the relays while opening. You have a point, one time I rebooted the inverter while charging, I will never do that again, it did not sound good. Considering how crappy the Huawei sw is in general it is probably wise to make sure no charging or discharging is ongoing when requesting the shutdown command. To avoid getting problems with sticky relays etc. |
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Good to know there are other poeple that have observed this strange behaviour. It is weird the battery behaves like this. Spending 2.5kwh per day just to keep the battery online seems to be very high cost. |
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I have the exact same problem. I have an ongoing support request to Huawei. My standby power consumption is 60-80W. Which is equivalent to > 0.5% of the SOC per hour. > 12% / day. Really extreme. Meaning battery fully drained within one week. In the datasheet for the inverter they define standby consumption as night mode with < 5.5W consumption. The battery datasheet does not specify any standby power consumption for what I can find. I have seen on Huawei forum others having similar issues, adviced to contact support by E-mail. |
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Ok, I hope you will share any answer from Huawei support here! |
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Ok, Huawei got back. Saying to update firmware. They attached to the e-mail firmware updates 146 for inverter and 116 for battery. I had 144 in inverter and 114 in battery. Updated just a few weeks ago Strange thing is on Huawei portal you can now download even newer SW. 148 for inverter and 119 for battery, one wonders why support did not send those newer in the E-mail. Will test now and get back to you with the result. |
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Could this be the reason my system seems to drain between 8 to 12 kw twice daily in one go. |
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I also noticed that my battery drains at about 100-110 W rate. About 0.1-0.11 kWh of capacity lost every hour. Also hoping to hear about any improvements after FW upgrades. |
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Sorry to say no improvement after upgrading firmware. Still approx 83W standby consumption. Support replied they will investigate. |
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Just curious - do you have 2 battery modules? I am wondering why I have over 100 W and you have slightly less drainage. |
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No I have 3 modules. 15 kwh. |
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Huawei basically seems to state that 150watt standby power consumption is normal. 10 Watt when disconnecting the inverter. If I managed to interpret correctly. Weird reasoning IMHO
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Thank you for sharing this response from Huawei. This is the formal acknowledgement from what I already suspected. |
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What is the best way to identify the exact loss for my own installation (5 kw battery with 4.6 KTL-L1 inverter)? If I understand the response from Huawei correctly, during Summer when the battery and inverter are always on, we could be constantly losing 150 W (or 3.6 kWh of my 5 kWh battery over 24 hours)? That would be quite astonishing. |
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You can look at "battery state of capacity" and "battery day discharge" for the standby hours to identify the standby consumption. |
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I have noticed that the batteries have built in heaters to keep them at some reasonable internal temperature during cold period. I have also noted that the battery drain is substantially higher during very cold conditions. |
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Currently I am figuring out the same. I was wondering why my energy consumption over night from the batteries shown in the Home Assistant Energy Dashboard exceeds the energy consumed over the day with no change of consumers is the house. Over night the battery is discharged with 0,3 - 0,33 kWh every hour (sensor.battery_total_discharge). As soon as the battery gets charging power from the PV or is fully loaded (no discharge anymore), my self-consumed energy drops by approx. 0,1 kWh every hour. This matches pretty much the experiences described above of approx. 100 W drain power. Where does this energy goes to? Is it the idle-energy and conversion losses consumed by the inverter which I cannot measure/obtain during PV-Production? I can't imagine that the battery is "leaking". Since my inverter and batteries are located in a fairly warm room, battery heating can't be the issue. |
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Some answers I have had is the possibility of a malfunctioning or badly
installed something like a non rreturn valve for water, a device that does
not allow energy to flow back to the pv. Also incorrectly wired batteries,
and possibly the parametres set on your batteries as to when they should
discharge..
I think there has been such a sureg in demand for solar power that
companies cannot employ enough correctly qualified engineers as it is all
about sales. But soon I think this will be their nemises as problems will
occur and they have not the know how to fix the issues.
…On Fri, 21 Jul 2023 at 13:19, Michael O. ***@***.***> wrote:
Currently I am figuring out the same. I was wondering why my energy
consumption over night from the batteries shown in the Home Assistant
Energy Dashboard exceeds the energy consumed over the day with no change of
consumers is the house. Over night the battery is discharged with 0,3 -
0,33 kWh every hour (sensor.battery_total_discharge). As soon as the
battery gets charging power from the PV or is fully loaded (no discharge
anymore), my self-consumed energy drops by approx. 0,1 kWh every hour. This
matches pretty much the experiences described above of approx. 110 W drain
power.
Where does this energy goes to? Is it the idle-energy consumed by the
inverter which I cannot measure/obtain during PV-Production? I can't
imagine that the battery is "leaking".
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I quickly built a sensor to check the power discrepancy between the dc supply power and the so called "active" power. In this moment, with 75 % of PV-Peak Power delivery, it shows a value of around 300 W. |
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I have no tec background and your abilities are amazing! Thing is we as
customers should not be left having to do this
Where do you live Michael?
…On Fri, 21 Jul 2023 at 13:54, Michael O. ***@***.***> wrote:
I quickly build a sensor to check the power discrepancy between the dc
supply power and the so called "active" power.
I calculated the DC-String power simply with Voltage * Current to know the
power comming down from my roof. Voltage and Current is given by the Modbus
Sensors. With having that, the following calculation should give
information about the "lost" energy needed by the inverter itself:
`
template:
- sensor:
- name: "PV Inverter Idle Power"
unit_of_measurement: "W"
device_class: power
state_class: measurement
icon: mdi:lightning-bolt
state: >-
{{(
(states.sensor.inverter_active_power.state | float) -
(states.sensor.pv_string_1_power.state | float) - #self-defined
sensor
(states.sensor.pv_string_2_power.state | float) - #self-defined
sensor
(states.sensor.battery_charge_discharge_power.state | float) |
round (2)
)}}
`
In this moment, with 75 % of PV-Peak Power, it shows a value of around 300
W.
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Hey Sheila (?? I am just guessing :-) ), not that hard as an electrical engineer with some practical hands-on. |
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Well I am just researching online. Even with that sometimes do feel I know
more than the installers.
Why cannot they take responsibility for their work.
…On Fri, 21 Jul 2023, 14:12 Michael O., ***@***.***> wrote:
Hey Sheila (?? I am just guessing :-) ),
not that hard as an electrical engineer with some practical hands-on.
I am from Germany.
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Well, they do, but they are "just" installers and not the developers of the components itself. And I am even pretty sure that not more than 5 % of their customers understand the background or even trying to create the statistics of what we are doing here. |
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Well ,Michael. You said it. Customers. Not investors.
A customer has not the possible privilege of earning from all new
tecnologies.
Customers pay for a product or service and deserve to get what they pay for.
They should not be used as a platform for research and development
Time for Tapas here.
Chat again.
…On Fri, 21 Jul 2023, 14:37 Michael O., ***@***.***> wrote:
Well, they do, but they are "just" installers and not the developers of
the components itself. And I am even pretty sure that not more than 5 % of
their customers understand the background or even trying to create the
statistics of what we are doing here.
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I have had my battery monitored and controlled by this integration for a few weeks now. It works well, but it takes some time to fully understand the behaviour of this device. Still there are a few things that I don't understand. I have configured my energy dashboard to include the battery and used Battery total charge and Battery total discharge as the data source. The output seems to be pretthy accurate for charging. If I charge the battery one hour, approximately 2,5 kwh goes into the battery. However, the last few days I haven't discharged the battery at all. This clearly seen when I examine the Battery Charge Discharge power sensor. I get a positve value during one hour when charging takes place. The rest of the day this sensor shows 0 kw. But when I look on the Energy Dashboard it shows a the battery has discharged 0.8 kwh! See enclosed pictures.
This puzzles me. Am I using the wrong sensors as input for the dashboard? How come the dashboard show 0.8kwh discharge during the day when the battery charge discharge power sensor only indicate postive values during the day? If I look on data from a day where I actually discharge the battery, the charge and discharge sensor shows both positiv and negative values.
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