Jakes Louw Posted February 3, 2021 Posted February 3, 2021 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? Quote
Speedster Posted February 3, 2021 Posted February 3, 2021 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. Quote
Jakes Louw Posted February 3, 2021 Author Posted February 3, 2021 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. Quote
Gnome Posted February 3, 2021 Posted February 3, 2021 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? Quote
Jakes Louw Posted February 3, 2021 Author Posted February 3, 2021 59 minutes ago, Gnome said: Why 3 phase? Farm supply is 3 phase. Quote
Speedster Posted February 3, 2021 Posted February 3, 2021 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. Quote
PaulinNorthcliff Posted February 3, 2021 Posted February 3, 2021 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. Quote
Speedster Posted February 3, 2021 Posted February 3, 2021 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? Quote
Jakes Louw Posted February 3, 2021 Author Posted February 3, 2021 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/ Quote
Speedster Posted February 3, 2021 Posted February 3, 2021 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. Quote
Jakes Louw Posted February 3, 2021 Author Posted February 3, 2021 12 minutes ago, Speedster said: That's a grid-tied inverter. Oops yes. Can't find a local price for their 5G hybrids. Quote
Jakes Louw Posted February 3, 2021 Author Posted February 3, 2021 (edited) 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, 2021 by Jakes Louw Quote
Speedster Posted February 3, 2021 Posted February 3, 2021 (edited) 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, 2021 by Speedster Quote
Jakes Louw Posted February 3, 2021 Author Posted February 3, 2021 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 Quote
Speedster Posted February 3, 2021 Posted February 3, 2021 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. Jakes Louw 1 Quote
Jakes Louw Posted February 3, 2021 Author Posted February 3, 2021 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 Quote
Speedster Posted February 3, 2021 Posted February 3, 2021 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. Quote
PaulinNorthcliff Posted February 3, 2021 Posted February 3, 2021 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... Quote
Speedster Posted February 3, 2021 Posted February 3, 2021 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. Quote
Speedster Posted February 3, 2021 Posted February 3, 2021 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 Quote
ChristoSnake Posted February 3, 2021 Posted February 3, 2021 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... Quote
Jakes Louw Posted February 4, 2021 Author Posted February 4, 2021 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...... Quote
Jakes Louw Posted February 4, 2021 Author Posted February 4, 2021 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......... Quote
Stanley Posted February 4, 2021 Posted February 4, 2021 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. Quote
Buyeye Posted February 4, 2021 Posted February 4, 2021 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 Quote
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