June 18, 20214 yr Hi All, Newbie checking in here, I'm planning the installation of a Sunsynk 5kw Inverter, 2 Pylontech US3000C Batteries (3rd on the horizon), and looking at 6 to 8 panels to start with. The plan is to have the geyser, oven, one aircon (24000 BTU) on the non essential circuit with the rest of the house wired up. I have an energy monitor and I do not see usage spikes greater than 5500W which includes a 3kw geyser (not on a timer). Other high usage appliances like the microwave, kettle, airfryer, dishwasher, washing machine, hairdryer etc. never really get used all at once. If I exclude the geyser from my base load and include the occasional spikes with the various appliances used, its usually peaks around 3500W. In terms of solar panels, I've been reading about the Jinko brand and their Tiger series seem to be rated well. Their Tiger 460W Mono panels seem to be priced well and I am wondering if 6 of those panels would match up to the Sunsynk 5kw inverter in terms of voltage, VOC etc. Again, complete noob with these terminology here but hoping to gain some valuable input and advice before making any decisions. I do not have a lot of North facing roof and can install 6 north facing panels. If I do expand at a later stage , panels would need to be install with an East/West split. Would you recommend those solar panels or should I consider something else altogether? Is 6 panels enough or start with? Any and all advice is welcomed. Many thanks.
June 18, 20214 yr You basicly dont have to worry about the non essential circuit as it does not run through the inverter ,the inverter will supplement solar and battery up to 5kw to your non essentials according to set times or your needs throughout the day. As long as you stay below 3,5kw(2 pylons ) on the ups side when the grid is down you wont have any problems. When the grid is available you can run up to 7kw on the ups/load side. Those solar panels will be perfect , i would run the first 6 of them on your north facing roof on the one mppt and then when u have more cash put 8 panels on west facing roof on second mppt. I am currently running 5 445w panels on each mppt . Planning to get another 4 panels soon.
June 18, 20214 yr Author Thanks for the feedback thus far. Got some reading to do on the string size calculations
June 18, 20214 yr 42 minutes ago, dawolf said: Thanks for the feedback thus far. Got some reading to do on the string size calculations And then when you have a good understanding, use this tool: or this one which I have updated for the 5K Sunsynk. PV String Tool.xlsx Edited June 18, 20214 yr by YellowTapemeasure
June 18, 20214 yr 1 hour ago, dawolf said: Thanks for the feedback thus far. Got some reading to do on the string size calculations Hi, Having just gone through this, I installed 12 X 450w, 2 strings of 6 on a 8kw Sunsynk. My surprise was that I get no where near 5400w, Because its winter. The most I saw was about 4200w. I have still to setup my monitoring and to get the proper numbers. Summer will be much better. Also my panels are 11a, Most I have seen is 9.6A. Your two important values. Startup voltage, max voltage allowed per MPPT, including panel Amps (I read sunsynk can clip if higher than spek)( each PV input on the inverter). Dont go over that top voltage, ever, There is so much YouTube from Kieth on Sunsynk explaining this. The only advice I could give on the solar panel is make sure its a well known brand and has the Tier one approval. They all offer similar warrentee, around 10 - 15 year but 25 years expected at some loss percentage a year. But I think. What will the value of say a 450w be in 10 years?? So to to me it was important to say, Whats my budget, what can I get for the money and what is the biggest Watts I can use and buy up front that will fit the inverter. Fewer panels more wattage less roof space, but I dont want to go over the inverter specs. And I love the Sunsynk, that was a great buy.
June 18, 20214 yr 5 minutes ago, Vassen said: For winter North facing is best. East west is really bad but sometimes we just need to make do with what we have. In summer, east west works really nice. Just a note, on each mppt, you should only install panels in the same direction, meaning you can’t have some east and some west. So ideally you start of with north and then check your loads and see if you need more in the early mornings or late afternoon and choose east or west for the second mppt. That make so much sense, When you watch the sun on your panels , I see some getting the sun, or loosing , before others. My one string is always better then the other , even though they are identical in make and size and in a row. I can only guess its the way the sun gets to the first string or maybe cable length. Having the string panel partly on another roof will really affect the effectiveness of the panels. Thank you for your valuable input ...
June 19, 20214 yr Author Really valuable feedback. Thank you guys. I am in Midrand, Johannesburg area. I do have a bit of calculations to do in terms of panel choice.
June 19, 20214 yr Author So looking at the inverter specs, It has a max DC input voltage of 500V, MPPT range is 125-425V and Start Up Voltage is 150V The Jinko Tiger Mono panel specs below, 460W (STC) Vmp 43.08V Imp 10.68A Voc 51.70V Isc 11.50A 6 panels equate to 310.20V which is within the operating range for the inverter with some head room to expand on that string should I add a panel or two. I've also input the panel specs in the PV String tool and the results are attached. Does this look feasible? Many thanks, daWolf
June 19, 20214 yr 1 hour ago, dawolf said: So looking at the inverter specs, It has a max DC input voltage of 500V, MPPT range is 125-425V and Start Up Voltage is 150V The Jinko Tiger Mono panel specs below, 460W (STC) Vmp 43.08V Imp 10.68A Voc 51.70V Isc 11.50A 6 panels equate to 310.20V which is within the operating range for the inverter with some head room to expand on that string should I add a panel or two. I've also input the panel specs in the PV String tool and the results are attached. Does this look feasible? Many thanks, daWolf Apologies, looks like my inverter data was fiddled with. Fixed in this version. Somehow it doesn't calculate for 2 MPPTs, but that's OK It looks good, note that I adjusted min temp for Midrand as -2, but it isn't plausible that it will reach -2 at 12H00. Great panels, you could probably go up to 8 in series, great for cloudy days! PV String Tool.xlsx Edited June 19, 20214 yr by YellowTapemeasure correction
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