March 12, 20215 yr When the grid loadshed them my essentials load output dips just enough to reset my servers. I have a sunsynk SUN-5K-SG01LP1-EU inverter. Is there away to keep the essentials load output on regardless if its getting power from the grid, solar or batteries? My load is constant 4.8kwh and I have 4 pylontech 3000c. If I add the ups back on the servers then my load is more than 5kwh so the inverter throws an AC overload and shutdown.
March 13, 20215 yr I suspect the dip is as the grid disappears the voltage dips until the relay opens. There will probably always be a very short dip. It will be interesting to note if others have been able to elimiate or reduce this dip. I notice it on the LED lights every time load shedding kicks in.
March 13, 20215 yr Author I need to force the essential laud output to always be driven. Not switch over
March 14, 20215 yr There's the rub, the Sunsynk does not switch to mains, and then switch to batteries / solar. It seemlessly blends to lot. The downside is when the grid goes down, it needs to open the relay that connects the UPS to the grid. In that moment it seems to dip for a short while. The dip is visible on my lights that run on the UPS output but we're fortunate that none of our appliances seem to care. My thinking is that the grid goes down and pulls the AC voltage down throughput the entire inverter until it detects and opens the AC relay that goes to grid. Looking at this block diagram I don't see how it can open fast enough to not have a short dip on all outputs. Notice there is no changover relay. Perhaps the grid voltage low (brownout voltage) can be set more aggressively so it cuts out sooner. Mine is set to 185V from the factory. Worth a try perhaps.
March 14, 20215 yr On my 5kW Sunsynk one doesn't even notice when switching during load shedding. Using 4.8kW on the UPS side is probably pushing the limit for a 5kW inverter
March 14, 20215 yr 19 hours ago, HannesZ said: I need to force the essential laud output to always be driven. Not switch over Why not move it load?
March 14, 20215 yr Author 2 hours ago, Speedster said: Why not move it load? Where? It's on the essentials output. Where should I move it? I noticed that if I reduced the load to 2.5kwh then the servers don't resets. But obviously I can do this when I have running work.
March 14, 20215 yr Author I ment I can't reduce the load all the time And ssh in to the servers at 4am is also not very conducive to long term parter relationships
March 14, 20215 yr 2 hours ago, HannesZ said: Where? It's on the essentials output. Where should I move it? I noticed that if I reduced the load to 2.5kwh then the servers don't resets. But obviously I can do this when I have running work. Apologies. I somehow read non-essential 🙈
March 14, 20215 yr Author Yes. I was tols that to run the multi they need to be the same model. I was planning to do this next year or closer to the end of winter but seems like they forced my hand
March 16, 20215 yr Author sunsynk updated the firmware of the inverter. Im hoping this solves the dip issue. If not Im thinking i can run a 750w Single phase AC motor driving a flywheel to store power for the switch over. Im just not sure if it will damage the inverter essential output.
March 16, 20215 yr 47 minutes ago, HannesZ said: sunsynk updated the firmware of the inverter. Im hoping this solves the dip issue. If not Im thinking i can run a 750w Single phase AC motor driving a flywheel to store power for the switch over. Im just not sure if it will damage the inverter essential output. what version number did they update it to?
March 16, 20215 yr 1 hour ago, HannesZ said: Keep us posted on the performance of this new version ...
March 16, 20215 yr Author well i don't know if its better but my servers still reboots. Talking to the tech it seems it is due to the soft start of the DC to AC converter. in retrospect I should most likely not have gone for this type of inverter. Edited March 16, 20215 yr by HannesZ
March 16, 20215 yr Author I added back the UPS on each which expect 230v so they don't bypass when the sunsynk runs. Resulting in a 5%-10% loss. Add the charging and I am over the output of the sunsynk. Edited March 16, 20215 yr by HannesZ
March 17, 20215 yr 5 hours ago, HannesZ said: I added back the UPS on each which expect 230v so they don't bypass when the sunsynk runs. Resulting in a 5%-10% loss. Add the charging and I am over the output of the sunsynk. What do you mean by over the output?
March 17, 20215 yr 8 hours ago, HannesZ said: well i don't know if its better but my servers still reboots. Talking to the tech it seems it is due to the soft start of the DC to AC converter. in retrospect I should most likely not have gone for this type of inverter. I'm pretty sure you've undersized your inverter for your use case. In addition to my whole houses load, I have four computers, two of which could be classified as a "server", on the essential load side of my 8kW Deye inverter and I don't experience any "turn offs" or "restarts" when Eskom power disappears. Edited March 17, 20215 yr by excitedphoton
March 17, 20215 yr 32 minutes ago, excitedphoton said: I'm pretty sure you've undersized your inverter for your use case. In addition to my whole houses load, I have four computers, two of which could be classified as a "server", on the essential load side of my 8kW Deye inverter and I don't experience any "turn offs" or "restarts" when Eskom power disappears. Yeah, this makes the most sense. Parallel another 5kW Sunsynk onto the existing one.
March 17, 20215 yr 1 hour ago, HannesZ said: AC fualt as the load with the ups exceeded 5.5kw Isn't that inverter meant to be able to do 35A AC passthrough? That's way more than 5KW.
March 17, 20215 yr Author I can't really fualt sunsynk. It's operating as designed. Just sad as I measured the load without the ups and at 4.8kw it was comfortably under the constant limit. I did not take in to consideration the effect of the soft start after change over. Obviously the inverter is not fit for this usecase but I'm now so deep down the rabbit hole there is no return. Adding a second sunsynk would also give me the option to expand my solar array.
March 17, 20215 yr 1 minute ago, HannesZ said: I can't really fualt sunsynk. It's operating as designed. Just sad as I measured the load without the ups and at 4.8kw it was comfortably under the constant limit. I did not take in to consideration the effect of the soft start after change over. Obviously the inverter is not fit for this usecase but I'm now so deep down the rabbit hole there is no return. Adding a second sunsynk would also give me the option to expand my solar array. Good luck, keep us posted.
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