d3nominat0r Posted April 6, 2022 Posted April 6, 2022 (edited) Hi there, Need to help to figure out of this will work. I'm planning to put up a Sunsynk 5kw Inverter and make use of both MPPT's. I have limited roof space, so can only fit 4 Panels North and then 4 Panels East. I'm looking at the getting JA 450W panels for my installation. I'm concerned about the MPPT start up voltage on the inverter, will 4 panels per MPPT work? Or should I try to fit 5 panels (might not be possible) or rather put everything on a single string? As for specifications, do I need to look at the Voc or Vmp figures on the panel data sheets as a start? The inverter looks like 150V per MPPT. Any advice would be appreciated. Thanks. Edited April 6, 2022 by d3nominat0r More info added Quote
Nexuss Posted April 6, 2022 Posted April 6, 2022 With only 4 of those panels you will be right around 150v and on some days it might stuggle to start up . I would recommend at least 5 panels per MPPT if you can make them fit on the roof. Quote
d3nominat0r Posted April 6, 2022 Author Posted April 6, 2022 (edited) @Nexuss Thanks, if the two strings of 4 are NE and NW respectively, so not spot on N and E, is having all 8 on a single string another option? Edited April 6, 2022 by d3nominat0r Quote
Nexuss Posted April 6, 2022 Posted April 6, 2022 10 minutes ago, d3nominat0r said: @Nexuss Thanks, if the two strings of 4 are NE and NW respectively, so not spot on N and E, is having all 8 on a single string another option? No its not an option ,you cannot have different facing arrays on one single series sting on one MPPT,the only way to do that is to parallel the stings and then you will be far over the 13 amp capabilities of the MPPT and thus lose out on lots of power. Even then its pointless as you are still stuck with the voltage of 4 panels which will not be enough. Not sure if that makes sense haha. Namreh 1 Quote
d3nominat0r Posted April 6, 2022 Author Posted April 6, 2022 Wanted to check, do you use the Vmp of Voc rating of the panels to calculate towards the startup mppt voltage? Quote
Froggie Posted April 6, 2022 Posted April 6, 2022 6 hours ago, d3nominat0r said: @Nexuss Thanks, if the two strings of 4 are NE and NW respectively, so not spot on N and E, is having all 8 on a single string another option? It will work. It'll be sub-optimal but possibly better than being below start-up voltage on the 4 panel option. hoohloc and Coulomb 2 Quote
Nexuss Posted April 6, 2022 Posted April 6, 2022 3 hours ago, d3nominat0r said: Wanted to check, do you use the Vmp of Voc rating of the panels to calculate towards the startup mppt voltage? I have 8 455w Ja solar panels on a string , operating voltages are between 280-315v so for 4 of the panels you will be at about half of that. Quote
Greatwhite Posted April 22, 2022 Posted April 22, 2022 Perhaps Consider smaller panels, so you can fit a few more and get the voltage up? Quote
Greatwhite Posted April 22, 2022 Posted April 22, 2022 On 2022/04/06 at 1:33 PM, d3nominat0r said: Wanted to check, do you use the Vmp of Voc rating of the panels to calculate towards the startup mppt voltage? Use the Vmp. Quote
Greatwhite Posted April 22, 2022 Posted April 22, 2022 Also consider portrait or lascape mounting if that creates more space. I have one strings one way the other the other to get them in the space I had avaliable and minimize shadding Quote
Petsvo Posted November 2, 2022 Posted November 2, 2022 I need help. I recently purchased a 5kw Sunsynk Hybrid Inverter with two MPPTs. My question concerns the PV voltage: is it 450 volts per mppt or 450 volts combined for both MPPT1 and MPPT2? I have 12 Jinko 550W PV Panels with 49.62 VoC that I'd like to connect to the inverter. What is the best panel connection to maximise power? Quote
Greatwhite Posted November 2, 2022 Posted November 2, 2022 28 minutes ago, Petsvo said: I need help. I recently purchased a 5kw Sunsynk Hybrid Inverter with two MPPTs. My question concerns the PV voltage: is it 450 volts per mppt or 450 volts combined for both MPPT1 and MPPT2? I have 12 Jinko 550W PV Panels with 49.62 VoC that I'd like to connect to the inverter. What is the best panel connection to maximise power? The voltage it per MPPT. However, I think I see a problem - If I am not mistaken, your peak current on your MPPTs for the 5kW Sunsynk is 11A (https://www.sunsynk.org/5kw-hybrid-inverter). peak current of the panels is nearly 14A (https://www.jinkosolar.com/uploads/5ff587a0/JKM530-550M-72HL4-(V)-F1-EN.pdf) Quote
Petsvo Posted November 2, 2022 Posted November 2, 2022 3 minutes ago, Greatwhite said: The voltage it per MPPT. However, I think I see a problem - If I am not mistaken, your peak current on your MPPTs for the 5kW Sunsynk is 11A (https://www.sunsynk.org/5kw-hybrid-inverter). peak current of the panels is nearly 14A (https://www.jinkosolar.com/uploads/5ff587a0/JKM530-550M-72HL4-(V)-F1-EN.pdf) So I can connect one array with 450 to MPPT 1 and another with 450 to MPPT 2? Concerning Amps, I believe the correct function is for the Inverter to draw the power it requires while keeping the Voltage at bay. As long as the voltage is correct, having 14 A may not affect the inverter. swazz99jhb and hoohloc 2 Quote
WannabeSolarSparky Posted November 2, 2022 Posted November 2, 2022 15 minutes ago, Greatwhite said: The voltage it per MPPT. However, I think I see a problem - If I am not mistaken, your peak current on your MPPTs for the 5kW Sunsynk is 11A (https://www.sunsynk.org/5kw-hybrid-inverter). peak current of the panels is nearly 14A (https://www.jinkosolar.com/uploads/5ff587a0/JKM530-550M-72HL4-(V)-F1-EN.pdf) With the new firmware the sunsynk5lw does 13 amps on the mppt's the clipping will be almost non-existent I have 540watt jasolar 6 in series on single mppt which has never gone above 12amps so those panels will be ok 6s on each mppt zsde and hoohloc 2 Quote
Greatwhite Posted November 2, 2022 Posted November 2, 2022 27 minutes ago, Petsvo said: So I can connect one array with 450 to MPPT 1 and another with 450 to MPPT 2? Concerning Amps, I believe the correct function is for the Inverter to draw the power it requires while keeping the Voltage at bay. As long as the voltage is correct, having 14 A may not affect the inverter. I have to ask another question: where did the 450v value come from? Per the link I posted MPPT limit is 425v and max DC is 500v. @WannabeSolarSparky posted the current rating per MMPT has been raised to 13A (have you got a published datasheet for that?), on that basis, has the MPPT voltage been raised too and do you have this current/latest firmware? (don't assume your new unit has the latest firmware) I personally would not take a chance on current - why publish a max value if you can exceed it? At least contact the chaps and Sunsynk before you make an expensive mistake. Bear in mind current is often limited by the size of the contacts. conductors, etc i.e. hardware. Petsvo 1 Quote
Petsvo Posted November 2, 2022 Posted November 2, 2022 Thanks, in my case i can series 6 panels on each MPPT giving me less the 300v of the Panels VoC will that work and be bale to startup the inverter. Quote
WannabeSolarSparky Posted November 2, 2022 Posted November 2, 2022 (edited) 12 minutes ago, Greatwhite said: MMPT has been raised to 13A (have you got a published datasheet for that?) If you buy a new sunsynk then you will see it on the spec label on the side of the inverter, and I am sure they would also have updated the manual to reflect the new specs. https://www.sunsynk.org/_files/ugd/52fa1b_7e4f8c092f0d4b1f94da08e8f74d96cf.pdf Page 12 Edited November 2, 2022 by WannabeSolarSparky Quote
WannabeSolarSparky Posted November 2, 2022 Posted November 2, 2022 (edited) 41 minutes ago, Greatwhite said: I personally would not take a chance on current - why publish a max value if you can exceed it? The current can be controlled/clipped by the sunsynk, the voltage can NOT. The inverter will increase the voltage to bring down the amps, but if the voltage spikes then that spike is too quick for the inverter to control then everything goes up in smoke. Voltage is usually the danger point in most electronics, the amps can usually be controlled with resistance, which is what I understand the sunsynk does. Very nice simple explanation from google. A general answer is that electronic/electrical components are damaged when their electrical ratings are exceeded. Excessive current results in excessive heat which will destroy both passive and active components. Some passive components, such as capacitors have a max voltage rating, which if exceeded can result in failure of the dielectric (insulator) resulting in excessive current, and ultimately smoke. Generally, exceeding voltage ratings of passive components causes insulation failure. With active components, excessive voltage will cause a breakdown of the internal junctions of the diode, transistor, etc, which will also allow excessive current, heat and some smoke. However, in these cases the current will be quite a bit lower than when passive devices are overheated. Even a small spark on a transistors leads will destroy the component. The over-voltage condition breaks down the semi-conductor junction and it does not heal. The part is now just a lump. So on the above info, yes, the amps do the damage, but it's the voltage that causes/leads to the amps doing the damage. Edited November 2, 2022 by WannabeSolarSparky Quote
Petsvo Posted November 2, 2022 Posted November 2, 2022 2 hours ago, WannabeSolarSparky said: If you buy a new sunsynk then you will see it on the spec label on the side of the inverter, and I am sure they would also have updated the manual to reflect the new specs. https://www.sunsynk.org/_files/ugd/52fa1b_7e4f8c092f0d4b1f94da08e8f74d96cf.pdf Page 12 PV Input Voltage 370Vd.c (125Vd.c ~ 500Vd.c) what does this mean in simpler terms ? MPPT Input Voltage 150Vd.c ~ 425Vd.c : is the MMPT voltage different to the PV input voltage, the manual is kind of confusing?. What is the minimum start up voltage? 370Vdc or 150Vdc Quote
WannabeSolarSparky Posted November 2, 2022 Posted November 2, 2022 4 minutes ago, Petsvo said: PV Input Voltage 370Vd.c (125Vd.c ~ 500Vd.c) what does this mean in simpler terms ? MPPT Input Voltage 150Vd.c ~ 425Vd.c : is the MMPT voltage different to the PV input voltage, the manual is kind of confusing?. What is the minimum start up voltage? 370Vdc or 150Vdc 370Vd.c - is the Optimal voltage for the mppt tracker - the point at which it will work best when the correctly spec'ed panels are used. (125Vd.c ~ 500Vd.c) - is the operating range - you will notice and hear most people suggest strongly that you stay below 450Vd.c. to allow enough legroom for voltage spikes. Above 450VD.c there may be a risk of damage depending on the lottery of the build components, some people have gone past that and not had any damage, but with the capital layout why risk it. Just keep below 450 and all should be good for a long time Startup voltage is 150Vd.c - i.e. the point at which the mppt will start working and producing amps, once it gets going it can drop to below that and still keep going down to about 125Vd.c then it may or may not stop producing. zsde and GreenFields 2 Quote
Petsvo Posted November 2, 2022 Posted November 2, 2022 7 hours ago, WannabeSolarSparky said: 370Vd.c - is the Optimal voltage for the mppt tracker - the point at which it will work best when the correctly spec'ed panels are used. (125Vd.c ~ 500Vd.c) - is the operating range - you will notice and hear most people suggest strongly that you stay below 450Vd.c. to allow enough legroom for voltage spikes. Above 450VD.c there may be a risk of damage depending on the lottery of the build components, some people have gone past that and not had any damage, but with the capital layout why risk it. Just keep below 450 and all should be good for a long time Startup voltage is 150Vd.c - i.e. the point at which the mppt will start working and producing amps, once it gets going it can drop to below that and still keep going down to about 125Vd.c then it may or may not stop producing. Thank you very much, i have done all the wiring haven't connected anything , will post the results. WannabeSolarSparky 1 Quote
Petsvo Posted November 3, 2022 Posted November 3, 2022 I haven't connected the PVs yet; I just want to configure the AC and batteries first. I have two pylontech 3000c batteries, i just want to resuscitate power after knocking off the old inverter; what is the recommended setting on these batteries? I was using the first generation Meccer 5kva inverter inverter and had not setup master slave; I need to do that on these batteries as well. I had the idea that you could have a simple option to choose battery manufacturer but its not there. Quote
Petsvo Posted November 3, 2022 Posted November 3, 2022 On 2022/11/02 at 1:16 PM, WannabeSolarSparky said: 370Vd.c - is the Optimal voltage for the mppt tracker - the point at which it will work best when the correctly spec'ed panels are used. (125Vd.c ~ 500Vd.c) - is the operating range - you will notice and hear most people suggest strongly that you stay below 450Vd.c. to allow enough legroom for voltage spikes. Above 450VD.c there may be a risk of damage depending on the lottery of the build components, some people have gone past that and not had any damage, but with the capital layout why risk it. Just keep below 450 and all should be good for a long time Startup voltage is 150Vd.c - i.e. the point at which the mppt will start working and producing amps, once it gets going it can drop to below that and still keep going down to about 125Vd.c then it may or may not stop producing. I haven't connected the PVs yet; I just want to configure the AC and batteries first. I have two pylontech 3000c batteries, i just want to resuscitate power after knocking off the old inverter; what is the recommended setting on these batteries? I was using the first generation Meccer 5kva inverter inverter and had not setup master slave; I need to do that on these batteries as well. I had the idea that you could have a simple option to choose battery manufacturer but its not there. Quote
WannabeSolarSparky Posted November 3, 2022 Posted November 3, 2022 30 minutes ago, Petsvo said: I haven't connected the PVs yet; I just want to configure the AC and batteries first. I have two pylontech 3000c batteries, i just want to resuscitate power after knocking off the old inverter; what is the recommended setting on these batteries? I was using the first generation Meccer 5kva inverter inverter and had not setup master slave; I need to do that on these batteries as well. I had the idea that you could have a simple option to choose battery manufacturer but its not there. Unfortunately I do not know those batteries, but I am sure many of the forum guys who use those will come along and point you in the right direction Quote
wolfandy Posted November 4, 2022 Posted November 4, 2022 On 2022/11/03 at 5:44 AM, Petsvo said: I haven't connected the PVs yet; I just want to configure the AC and batteries first. I have two pylontech 3000c batteries, i just want to resuscitate power after knocking off the old inverter; what is the recommended setting on these batteries? I was using the first generation Meccer 5kva inverter inverter and had not setup master slave; I need to do that on these batteries as well. I had the idea that you could have a simple option to choose battery manufacturer but its not there. If you have the Pylons connected to the Sunsynk, then the only setting you need to do is the Ah on the Battery page (74Ah in your case). The inverter will get all other data directly from the BMS. You can check everything by going the the BMS page in the Sunsynk menu Petsvo 1 Quote
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