February 3, 20215 yr Busy with planning my grid tie system. Looking at around 15kW 3ph, no batteries, probably dual MPPT minimum. While I have somebody's attention: is there a list of forum approved online shops anywhere?
February 3, 20215 yr I'm moving to a home with 3P soonest, so have been looking at a number of options. Depending on what the exact wiring / circuitry in the house looks like I'm leaning towards going for a couple of single phase Sunsynk 5kW inverters connected in parallel, together with a couple of strings of panels and some batteries.
February 3, 20215 yr Author 2 hours ago, Speedster said: I'm moving to a home with 3P soonest, so have been looking at a number of options. Depending on what the exact wiring / circuitry in the house looks like I'm leaning towards going for a couple of single phase Sunsynk 5kW inverters connected in parallel, together with a couple of strings of panels and some batteries. From what I've read (and I'm useless when it comes to electrickery so somebody should confirm) you need to be able to balance your phases otherwise you pick up issues. The Solis 3PH apparently does that for you.
February 3, 20215 yr 3 hours ago, Jakes Louw said: Busy with planning my grid tie system. Looking at around 15kW 3ph, no batteries, probably dual MPPT minimum. While I have somebody's attention: is there a list of forum approved online shops anywhere? Why 3 phase?
February 3, 20215 yr 2 hours ago, Jakes Louw said: From what I've read (and I'm useless when it comes to electrickery so somebody should confirm) you need to be able to balance your phases otherwise you pick up issues. The Solis 3PH apparently does that for you. The Sunsynks can be paralleled across phases.
February 3, 20215 yr 1 minute ago, Speedster said: The Sunsynks can be paralleled across phases. They're full Super Hybrids. They may be a bit much (technology-wise) as well as price-wise for this application. The price differential will be significant.
February 3, 20215 yr 1 minute ago, PaulinNorthcliff said: They're full Super Hybrids. They may be a bit much (technology-wise) as well as price-wise for this application. The price differential will be significant. Can you show me a 3-phase hybrid inverter for less than R60k?
February 3, 20215 yr Author 39 minutes ago, Speedster said: Can you show me a 3-phase hybrid inverter for less than R60k? https://www.livestainable.co.za/product/solis-5kw-20kw-4g-3-phase-dual-mppt-dc-inverter/
February 3, 20215 yr 1 minute ago, Jakes Louw said: https://www.livestainable.co.za/product/solis-5kw-20kw-4g-3-phase-dual-mppt-dc-inverter/ That's a grid-tied inverter.
February 3, 20215 yr Author 12 minutes ago, Speedster said: That's a grid-tied inverter. Oops yes. Can't find a local price for their 5G hybrids.
February 3, 20215 yr Author 12 minutes ago, Jakes Louw said: Oops yes. Can't find a local price for their 5G hybrids. Found it: https://www.livestainable.co.za/product/solis-25kw-125kw-3-phase-triple-mppt-dc-inverter/?attribute_size-in-kw=25kW+3Phase+Inverter&utm_source=Google Shopping&utm_campaign=Primary Google Feed &utm_medium=cpc&utm_term=66109 Model RHI-3P10K-HVES-5G (or it should be) Edited February 3, 20215 yr by Jakes Louw
February 3, 20215 yr 11 minutes ago, Jakes Louw said: Found it: https://www.livestainable.co.za/product/solis-25kw-125kw-3-phase-triple-mppt-dc-inverter/?attribute_size-in-kw=25kW+3Phase+Inverter&utm_source=Google Shopping&utm_campaign=Primary Google Feed &utm_medium=cpc&utm_term=66109 I could be mistaken but I don't think one can connect batteries to those models in the link. The Model RHI-3P10K-HVES-5G (or it should be) is an option, but requires the HV batteries - and we're still awaiting pricing (and stock) in SA. Edited February 3, 20215 yr by Speedster
February 3, 20215 yr Author 5 minutes ago, Speedster said: I could be mistaken but I don't think one can connect batteries to those models. https://www.ginlong.com/rhi_3pinverter1/29118.html Battery Battery Type: Li-ion Battery voltage range: 160~600 V Max. charge/discharge power: 10 kW Max.charge/discharge current: 25 A Communication: CAN/RS485
February 3, 20215 yr 2 minutes ago, Speedster said: I could be mistaken but I don't think one can connect batteries to those models. 1 minute ago, Jakes Louw said: https://www.ginlong.com/rhi_3pinverter1/29118.html Battery Battery Type: Li-ion Battery voltage range: 160~600 V Max. charge/discharge power: 10 kW Max.charge/discharge current: 25 A Communication: CAN/RS485 That's a different inverter to the one you linked. We're still awaiting pricing (and stock) in SA.
February 3, 20215 yr Author 4 minutes ago, Speedster said: That's a different inverter to the one you linked. We're still awaiting pricing (and stock) in SA. 👍 I think you are right
February 3, 20215 yr 2 minutes ago, Jakes Louw said: 👍 I think you are right I've just re-read your original post. You're looking for grid-tie with no battery, which leaves you with quite a few inverter options. Unfortunately my use-case requires hybrid.
February 3, 20215 yr 23 minutes ago, Speedster said: I've just re-read your original post. You're looking for grid-tie with no battery, which leaves you with quite a few inverter options. Unfortunately my use-case requires hybrid. Ja, but you know how this works. Grid-tied is the thin end of the wedge...
February 3, 20215 yr On the Solis option, I was very excited about the 3P hybrid when I saw it, because it's listed at about R50k. I spoke to one of their lead engineers and was less optimistic when I realised it has some differences / limitations to the existing single phase options. One of these being the HV battery system. The Pylontech HV's are about R20k a piece (for 48V, 2.4kW) and you would need at least 4 of them to reach the required voltage.
February 3, 20215 yr 1 hour ago, Vassen said: I got an email about this. https://solaradvice.co.za/product/goodwe-et-series-10kw-3-phase-inverter/ I don’t know how good it is or they are. Apparently they have byd high voltage batteries as well. That actually looks pretty decent. I'll have a closer look at the spec sheet a bit later
February 3, 20215 yr Welcome to the forum, Jakes! Chat to our colleague Thomas v S. He lives in your neck of the woods, runs multiple inverters and did the install himself. You may find a lot of common ground...
February 4, 20215 yr Author 13 hours ago, ChristoSnake said: Welcome to the forum, Jakes! Chat to our colleague Thomas v S. He lives in your neck of the woods, runs multiple inverters and did the install himself. You may find a lot of common ground... Meneer Slang, dankie. Which reminds me to update my location on my profile......
February 4, 20215 yr Author 17 hours ago, PaulinNorthcliff said: Ja, but you know how this works. Grid-tied is the thin end of the wedge... I need somebody to teach me about islanding.........and how to do it.........😀
February 4, 20215 yr 12 minutes ago, Jakes Louw said: I need somebody to teach me about islanding.........and how to do it.........😀 In grid-tied inverter terminology, islanding is a bad thing. If the grid fails, but the inverter doesn't detect the grid loss and continues to energize the lines on it's AC input, then it is said to be islanding (or creating an island). This is not allowed, and so inverter manufacturers have to employ several different methods of detecting this situation so that they can disconnect from the grid and prevent the creation of an island.
February 4, 20215 yr 43 minutes ago, Jakes Louw said: I need somebody to teach me about islanding.........and how to do it.........😀 This is the island you are looking for. https://www.sustainable.co.za/sma-sunny-island-8-0h-12-inverter.html
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