Posted December 19, 20222 yr Hi fellow Goodwe users I've noticed a signifcant variation in Solar production this morning as can be seen from the attached graph from SEMS, conditions were mostly cloud free and we were/are experiencing load shedding, the battery is in process of being charged, the inverter is set up in General mode. This is the second time I've noticed this behaviour. I would like to know if it posible to prevent the fluctuations as it seems to be inefficient. Has any one else seen this behaviour? PV production goes up to over 5500+ watt then suddenly drops to 1000- watts and then ramps up to again. During the high production a signifcant portion is fed into charging the battery which is pleasing, but then dropping production less so.
December 19, 20222 yr 25 minutes ago, BGb said: I would like to know if it posible to prevent the fluctuations Have you tried shouting at the clouds?
December 19, 20222 yr Author No, does it help? 😁 Possibly a better option is to not look at power production....
December 19, 20222 yr 50 minutes ago, BGb said: Hi fellow Goodwe users I've noticed a signifcant variation in Solar production this morning as can be seen from the attached graph from SEMS, conditions were mostly cloud free and we were/are experiencing load shedding, the battery is in process of being charged, the inverter is set up in General mode. This is the second time I've noticed this behaviour. I would like to know if it posible to prevent the fluctuations as it seems to be inefficient. Has any one else seen this behaviour? PV production goes up to over 5500+ watt then suddenly drops to 1000- watts and then ramps up to again. During the high production a signifcant portion is fed into charging the battery which is pleasing, but then dropping production less so. Cannot explain why yours drops with no cloud. I had clouds just like @mzezman LS from 10h00.
December 19, 20222 yr It's probably a cloud, which causes production to drop below load, causing a battery mode switch from charging to discharging, which will cause it to stay in that mode for a while. The best policy is not to worry about it.
December 19, 20222 yr Author On a cloudfree day without loadshedding and battery fully charged, system clips production at 4.7kW, none of this up and down stuff
December 19, 20222 yr Yeah, it's the clouds, and then I'm going to go with loads that go on and off like the want to confuse the system even further.
December 19, 20222 yr 7 hours ago, BGb said: On a cloudfree day without loadshedding and battery fully charged, system clips production at 4.7kW, none of this up and down stuff With the same fluctuating loads. So I think we have to accept that PV was variable on the day of the first trace you showed, even if you didn't notice it. Even on the day you found unsatisfactory, the battery is charged by midday. Where's the problem? You have regular peaks of demand through the night, and it looks like your SOC protection is set quite high because the SOC line flattens out. But then it does get lower at some point - because it is lower at the start of the day. So how does that happen? I'm not saying it's wrong, but I'm interested.
December 20, 20222 yr Author @Bobster.what should the SOC protection be set at, and where do you set it? For the first example I would have preferred a constant PV production satisfying load and balance to battery, but perhaps the inverter is unable to respond fast enough as load changed, resulting in the inverter restarting from a lower base, or the battery charging load getting to high Max 100 amps)? Bear in mind the Goodwe only records data every 5 min. Goodwe support informed me that they changed the settings on my inverter When I asked them about the fluctuation, I would assume via PVMASTER (there are many "new" settings in the latest PVMASTER release) that I dont touch "We made high DC injection adjustments as the high DC is one of the factors that can cause the PV production to drop. We also change the safety setting to 50 Hz grid default"
December 20, 20222 yr 8 minutes ago, BGb said: @Bobster.what should the SOC protection be set at, and where do you set it? For the first example I would have preferred a constant PV production satisfying load and balance to battery, but perhaps the inverter is unable to respond fast enough as load changed, resulting in the inverter restarting from a lower base, or the battery charging load getting to high Max 100 amps)? Bear in mind the Goodwe only records data every 5 min. Goodwe support informed me that they changed the settings on my inverter When I asked them about the fluctuation, I would assume via PVMASTER (there are many "new" settings in the latest PVMASTER release) that I dont touch "We made high DC injection adjustments as the high DC is one of the factors that can cause the PV production to drop. We also change the safety setting to 50 Hz grid default" Interesting - hopefully we get a cloud-free day and you can compare
December 21, 20222 yr 11 hours ago, BGb said: @Bobster.what should the SOC protection be set at, and where do you set it? SOC protection is a way to reserve some of your battery for outages. The right setting is the one that suits you. There are two parts to it. When specifying these we express them as DoD. Depth of Discharge. This is inverse to SOC: 60% DoD means 60% used & so 40% remaining. The two parts are for when grid is available and when there is no grid. My system is set so that it will not discharge more than 60% of the battery when there is grid, and not more than 90% when there is no grid. IE when the connection to grid is lost, I should always have 40% of the battery remaining. That's my safety margin. If grid is available, and SOC reaches 40%, then my system will use grid. This is all set up under the advanced settings tab in PV Master.
December 21, 20222 yr On 2022/12/19 at 11:22 PM, Bobster. said: You have regular peaks of demand through the night, and it looks like your SOC protection is set quite high because the SOC line flattens out. But then it does get lower at some point - because it is lower at the start of the day. So how does that happen? Doh! It happens because SOC is preventing discharge whilst grid is available. Then load shedding happens at night & so the system has to use battery. IOW SOC Protection is doing what it should.
December 21, 20222 yr Author Thanks @Bobster.my settings appears to be ok, it is 70% on grid and 89% off grid (this one of the few settings that I do know). PVMaster is not my favourite piece of software I often have difficulty connecting to the inverter Wifi, tried it 5 min ago was able to connect to PVmaster but and got a message "failed to retrieve data". If I do connect I find that my Goodwe often looses the off grid setting when I change the on grid setting. This is my settings for my battery from Cef's utility
December 21, 20222 yr 16 hours ago, BGb said: "We made high DC injection adjustments as the high DC is one of the factors that can cause the PV production to drop. We also change the safety setting to 50 Hz grid default" Don't do that. The newer firmware does not have the high DC injection issue (aside from the fact that it is only an issue when connected to the grid). If you change to 50Hz grid default, you disable some of the safety features, and your inverter is not NRS-097 compliant anymore.
December 21, 20222 yr Author 2 minutes ago, P1000 said: Don't do that. The newer firmware does not have the high DC injection issue (aside from the fact that it is only an issue when connected to the grid). If you change to 50Hz grid default, you disable some of the safety features, and your inverter is not NRS-097 compliant anymore. The changes were made by Goodwe support, I don't know where to make the changes. 🙄 What should the settings be? As far as know I'm using the latest firmware 242416 (also installed by Goodwe support)
December 21, 20222 yr 7 minutes ago, P1000 said: If you change to 50Hz grid default, you disable some of the safety features, and your inverter is not NRS-097 compliant anymore. That message caught my eye too. @BGbone of the consequences of that setting is that your inverter will stay connected to grid as long as it is 50Hz (give or take a small tolerance). Remember that your inverter will also mimic the grid. So if grid voltage gets low, your inverter's output voltage will drop with it. This may not be what you want. Where I live the voltage, especially on restoration after load shedding, can get down into the 180s. My Goodwe has the safety code set for South Africa. As @P1000says, this gives more protection. My Goodwe will disconnect if grid voltage gets too high or too low. Also, after restoration of power, it usually waits a few minutes for the grid to stabilise and get up to a certain voltage.
December 21, 20222 yr 51 minutes ago, BGb said: Thanks @Bobster.my settings appears to be ok, it is 70% on grid and 89% off grid (this one of the few settings that I do know). Yes. That corresponds with the behaviour we see on the screen shots, where SOC hits 70% and then stays there. At that point your system starts drawing from the grid.
December 21, 20222 yr 6 hours ago, BGb said: The changes were made by Goodwe support, I don't know where to make the changes. 🙄 What should the settings be? As far as know I'm using the latest firmware 242416 (also installed by Goodwe support) @BGb Latest firmware installed by Goodwe technical service on my system: 242417. Approximately 2 months ago.
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