July 13, 20241 yr Hi, I have install new 3kw system. Inverter knox. Grid bypass mode Always on , connected to grid even enough energy from pv. I switched off grid and have tested with 2000 watt load worked fine but when switched on grid , bypass mode on. Below is my settings. 1. Sol 2. 30A charging current 3. Fld battery type 12. 24ah back to utility 13. Full back to grid 16. OSO Battery charging 26. 28.2ah Bulk charging 27. 27ah float charging 29. 21ah cut-off voltage Thanks
July 13, 20241 yr 25 minutes ago, Chand said: Hi, I have install new 3kw system. Inverter knox. Grid bypass mode Always on , connected to grid even enough energy from pv. I switched off grid and have tested with 2000 watt load worked fine but when switched on grid , bypass mode on. Below is my settings. 1. Sol 2. 30A charging current 3. Fld battery type 12. 24ah back to utility 13. Full back to grid 16. OSO Battery charging 26. 28.2ah Bulk charging 27. 27ah float charging 29. 21ah cut-off voltage Thanks Is it possible to take pictures of the settings page of the manual or directly from the inverter display. You are missing output source priority settings normally on Voltronic inverters it is setup in program 01 as USB(utility first normally default), SUB(Solar first) and SBU(solar > battery>utility). It seems your inverter is configured USB that would stay in pass through until utility falls away( power failure or Ls) Also indicate the chemistry and ah rating of your battery as the inverter is setup for lead acid at the moment. Edited July 13, 20241 yr by TaliaB
July 13, 20241 yr Author I have following three options . Utility first Solar first Sbu (solar. Battery. Utility ). And my settings is on SOL . solar first
July 13, 20241 yr Welcome to the forum! It looks like your inverter is a genuine or clone Voltronic. Try setting 01 to SbU. I would recommend setting 05 (battry type) to USE. Then set 12, 13, 26, 27 and 29 to battery specifications.
July 13, 20241 yr Author My inverter is The Knox Argon 3kW VMII 4000. i don't want to use SBU option, i want to preserve battery for Ls
July 13, 20241 yr 7 hours ago, Chand said: My inverter is The Knox Argon 3kW VMII 4000. i don't want to use SBU option, i want to preserve battery for Ls Can you post a pic of the sticker with summary specs that is on the right hand side on the inverter.
July 13, 20241 yr 9 hours ago, Chand said: Grid bypass mode Always on , connected to grid even enough energy from pv. I switched off grid and have tested with 2000 watt load worked fine but when switched on grid , bypass mode on. Below is my settings. That is about right. The term bypass is a bit of a misnomer these days. To be in SOL mode, the grid must blend in any shortfall when the pv cannot supply enough power. Therefore the grid is connected to the output, hence the term bypass. It is only when the inverter is in SBU mode that grid gets disconnected from the output.
July 14, 20241 yr Author 10 hours ago, Scorp007 said: Can you post a pic of the sticker with summary specs that is on the right hand side on the inverter.
July 14, 20241 yr 20 hours ago, Chand said: I have following three options . Utility first Solar first Sbu (solar. Battery. Utility ). And my settings is on SOL . solar first Having a high voltage MPPT I find it strange that you don't have a SUB mode but only SBU with the other modes as indicated.
July 14, 20241 yr Author 19 minutes ago, Scorp007 said: Having a high voltage MPPT I find it strange that you don't have a SUB mode but only SBU with the other modes as indicated. I think SUB and SOL is the same.
July 14, 20241 yr 19 minutes ago, Chand said: I think SUB and SOL is the same. Thanks. The older low voltage models have different options and I don't have a HV manual. As per the reply from @BritishRacingGreen when the PV cannot provide all the power for the load some power will be blended from the grid to cater for the shortfall. Edited July 14, 20241 yr by Scorp007
July 14, 20241 yr 21 hours ago, Chand said: Hi, I have install new 3kw system. Inverter knox. Grid bypass mode Always on , connected to grid even enough energy from pv. I switched off grid and have tested with 2000 watt load worked fine but when switched on grid , bypass mode on. Below is my settings. 1. Sol 2. 30A charging current 3. Fld battery type 12. 24ah back to utility 13. Full back to grid 16. OSO Battery charging 26. 28.2ah Bulk charging 27. 27ah float charging 29. 21ah cut-off voltage Thanks What is your battery Voltage at the time of testing? Possibly below the value in Setting 12, ie. 24V "back to utility" Voltage? Considering you may have discharged to 21V cut-of Voltage overnight.
July 14, 20241 yr Author 45 minutes ago, GreenFields said: What is your battery Voltage at the time of testing? Possibly below the value in Setting 12, ie. 24V "back to utility" Voltage? Considering you may have discharged to 21V cut-of Voltage overnight. Battery voltage was 27v and pv was providing power to load only no sharing from battery but still inverter was in bypass mode.
July 14, 20241 yr 22 hours ago, Chand said: Utility first Solar first Sbu (solar. Battery. Utility ). Hi @Scorp007, the OP mentions three modes as per above. I assume first mode is USB, second mode is SUB and third mode is SBU. In the first 2 we require grid connected (legacy line/bypass mode). SBU, grid is altogether disconnected (legacy battery mode).
July 14, 20241 yr 1 hour ago, BritishRacingGreen said: Hi @Scorp007, the OP mentions three modes as per above. I assume first mode is USB, second mode is SUB and third mode is SBU. In the first 2 we require grid connected (legacy line/bypass mode). SBU, grid is altogether disconnected (legacy battery mode). Thanks that you always clarify the detail around the settings available. You're a star.
July 15, 20241 yr 19 hours ago, Chand said: I think SUB and SOL is the same. No, very different. I think no SUB on this model because it's a very old Voltronic model. It came out soon after the original MKS models, perhaps 2015ish. SOL is a sort of solar UPS, good for keeping the battery full for load shedding. Goes to bypass mode as soon as the sun goes down, or there is no solar.
August 24, 20241 yr Author Hi, I found new issue , at night or when ever system shift on grid, Earth light on electricity meter turns on and strange thing is it happens only when load exceeds 200w, My solar system is 3kw. What could be the reason? Note:-My house has no earthing. Only phase and neutral wires are there.
August 26, 20241 yr On 2024/08/25 at 2:37 AM, Chand said: Note:-My house has no earthing. Only phase and neutral wires are there. Perhaps your location uses a combined protective earth and neutral system? It's unusual, but it exists. On 2024/08/25 at 2:37 AM, Chand said: Earth light on electricity meter turns on I can't imagine what that means, especially as you claim that there is no earth. Can you post a photo of this light, please?
August 26, 20241 yr Author 2 hours ago, Coulomb said: Perhaps your location uses a combined protective earth and neutral system? It's unusual, but it exists. I can't imagine what that means, especially as you claim that there is no earth. Can you post a photo of this light, please?
August 26, 20241 yr Author Hi, Coulomb Thanks for your time, I have made further experiments , i have increase the load when load goes above 700W earth light turns off. So the earth light turns on only when load between 200w to 700w, below 200w and above 700w no issue. Its really very strange.
August 26, 20241 yr 5 hours ago, Coulomb said: Perhaps your location uses a combined protective earth and neutral system? It's unusual, but it exists. TN-C-S transforms into PME when the PEN or Combined Neutral Earth (CNE) conductor is earthed at multiple points in the supply and at the source itself. Protective Neutral Bonding (PNB), akin to PME, operates within the TN-C-S framework but introduces a crucial distinction. In PNB, the neutral earth connection is established once at or near the customer's installation rather than at multiple locations. This is particularly common in scenarios where dedicated transformers for individual customer connections or pole-mounted transformers serving isolated locations are prime examples of TN-C-S PNB setups. 3 hours ago, Chand said: So the earth light turns on only when load between 200w to 700w, below 200w and above 700w no issue. Its really very strange. To be on the safe side i would suggest you get a electrician with a multi tester to do a neutral loop impedance test and also do a functional test on your RCD for trip threshold and response time(25~40ms)
August 27, 20241 yr Author 8 hours ago, TaliaB said: To be on the safe side i would suggest you get a electrician with a multi tester to do a neutral loop impedance test and also do a functional test on your RCD for trip threshold and response time(25~40ms) Definitely i will do.
August 28, 20241 yr A Google search indicates that this LED means "earth is used as neutral" or "earth is connected to neutral". This makes little sense to me, if the earth is provided by the combined earth-neutral cable from the transformer. This video may be relevant; I can't understand the language used, nor the subtitles. https://www.youtube.com/watch?v=-WCdFSHELJQ It's a different brand of inverter, but you may get the gist of what it's about. Edited August 28, 20241 yr by Coulomb
August 28, 20241 yr 27 minutes ago, Coulomb said: A Google search indicates that this LED means "earth is used as neutral" or "earth is connected to neutral". This makes little sense to me, if the earth is provided by the combined earth-neutral cable from the transformer. This video may be relevant; I can't understand the language used, nor the subtitles. https://www.youtube.com/watch?v=-WCdFSHELJQ It's a different brand of inverter, but you may get the gist of what it's about. It is a pity that there is no english subtitles only Hindi. But well done for finding the video as how to disable it(i think🤔
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