February 3, 20233 yr 3 minutes ago, wolfandy said: This is very interesting. Because in theory you can connect connect a whole lot more than 6.5kW and still be within the V and A limits of each MPPT. If true, this would allow you to put more than 9kW on the unit across both MPPTs. On the other hand, I could argue that your 7.3kW of panels is just over 10% excess on the 6.5kW limit as per specs - and hence similar to what I remember @Coulombadvising for the older Axperts. Does anyone have any more knowledge or experience with how much we can overload a Sunsynk? The thing with oversizing too extremely is that its quite wastefull,you have to remember that everything above 5kw is only DC to DC so if your batteries are fully charged you will only make 5kw max. Putting 8 plus kw on the 5kw inverter is too much unless you have a good east west type split system like i do. Even then i would opt for the 8kw inverter if i were going for 8-9kwp solar.
February 3, 20233 yr 5 minutes ago, onverwag said: Hi Nexuss, where is this setting please? I have currently 8 x 550W on 1 MPPT, and would like to add aother string of 7 and take one off the 8 to balance the MPPT, thus 7 on each MPPT, thus the question In the settings menu under advanced ->Other -> Max solar PV
February 3, 20233 yr There is a limit on the short circuit current capability. It's not easily to find for most of the Sunsynks, but I would not go over 20% of the rated current for the MPPT, and not over 150% on wattage.
February 3, 20233 yr Author Just now, P1000 said: There is a limit on the short circuit current capability. It's not easily to find for most of the Sunsynks, but I would not go over 20% of the rated current for the MPPT, and not over 150% on wattage. The rates Isc or norma operating current?
February 3, 20233 yr 22 minutes ago, onverwag said: I have currently 8 x 550W on 1 MPPT, and would like to add aother string of 7 and take one off the 8 to balance the MPPT, thus 7 on each MPPT, thus the question Please keep us posted on how your system performs when you have both strings connected
February 3, 20233 yr For a 5kw sunsynk, it can only out out 5kw of power (disregarding Eskom adding to make 35A). But it can do 5kw power from PV in the forward direction, I.e to essential loads, but... Can it also do 5kw in the bi direction thus if we have 10kwp panels (5000wp on each mppt) can the one before the essential load and the other for the non essential bi direction ?
February 3, 20233 yr 3 minutes ago, Dylboy said: For a 5kw sunsynk, it can only out out 5kw of power (disregarding Eskom adding to make 35A). But it can do 5kw power from PV in the forward direction, I.e to essential loads, but... Can it also do 5kw in the bi direction thus if we have 10kwp panels (5000wp on each mppt) can the one before the essential load and the other for the non essential bi direction ? It will invert / export a max of 5kw - If batteries are full then it will throttle PV output to 5kw to export / send to Non-essentials. If batteries are not full then it will send some to the batteries and the balance of 5kw to the non-essentials
June 19, 20232 yr Can i put 10 panels on a string with Voc 37.7v? This would give 377v which is sonewhat less than the max volts allowed on the sunsynk?
June 20, 20232 yr 17 hours ago, PaulKapp said: Can i put 10 panels on a string with Voc 37.7v? This would give 377v which is sonewhat less than the max volts allowed on the sunsynk? Yes you can.
February 10, 20242 yr On 2023/02/02 at 9:29 PM, mzezman said: 6500w total (both MPPTs) but you can over provision - just don't have more than the 425/450V max or the MPPT will blow. You can have more than 13A but the inverter will clip the excess - useful for winter months Is this 425/450v per mppt or for both? I wanted to put 9 panels.. 4 East on 1 mppt and 5 North on another.. VOC is 49.4v which is total of 444V total or 247v on one mppt and 197V on other.. Can this work on a 5kw?
February 10, 20242 yr 1 hour ago, Solarcrazy said: Is this 425/450v per mppt or for both? I wanted to put 9 panels.. 4 East on 1 mppt and 5 North on another.. VOC is 49.4v which is total of 444V total or 247v on one mppt and 197V on other.. Can this work on a 5kw? Per mppt. Your mix should work
February 11, 20242 yr 20 hours ago, Solarcrazy said: Is this 425/450v per mppt or for both? I wanted to put 9 panels.. 4 East on 1 mppt and 5 North on another.. VOC is 49.4v which is total of 444V total or 247v on one mppt and 197V on other.. Can this work on a 5kw? More answers on your other topic where you gave more information like directions and space available on the 3 portions of the roof.
June 3, 20242 yr I have a Sunsynk 5kW hybrid inverter, with a single 5kWh Sunsynk battery and 8x 505w Longi panel (total 4040w). Can I add 4 additional panels? Do the wattage of the new panels need to match those of the ones already installed? (I am think about getting 555w longi panels x 4) Re balancing MPPT 1 & 2 - Is it absolutely necessary? And I assume its about balancing the capacity of each MPPT rather than equal number of panels Is 6260 within range for a 5kWh inverter? Thanks in advance.
June 4, 20242 yr 7 hours ago, rgt.dnl said: I have a Sunsynk 5kW hybrid inverter, with a single 5kWh Sunsynk battery and 8x 505w Longi panel (total 4040w). Can I add 4 additional panels? Do the wattage of the new panels need to match those of the ones already installed? (I am think about getting 555w longi panels x 4) Re balancing MPPT 1 & 2 - Is it absolutely necessary? And I assume its about balancing the capacity of each MPPT rather than equal number of panels Is 6260 within range for a 5kWh inverter? Thanks in advance. The inverter is specified to take up to 6500W of solar panels. The "cleanest" would be to add more of the same 505W panels as you have now and arrange it as 6 per MPPT. It is not necessary to balance the MPPT's. There are I suppose different views on whether you could/should exceed 6500W, or whether you could/should exceed 3250W per MPPT. Personally I stick to the dataplate on my own inverter, but others may differ. It's possible to add different panels, but ideally the voltage and more so the current specs should be a close match.
June 12, 20242 yr Quick follow-up (for the avoidance of doubt). Current set-up: Sunsynk 5kW Inverter Sunsynk 5kWh Battery 8 x Longi 505w (LR5-66HPH-505M; see Electrical Characteristics below) panels in a single MPPT Question: I am planning to add 4 more Longi panels (same as already installed). Can I add them to the same MPPT as the existing panels without breaching the current or voltage limits of the inverter? (I am within the watts limit of 6500w for the inverter) Many thanks in advance!
June 12, 20242 yr No. You take the VoC of 45.7 x 12 and you are over the max voltage of your inverter of 425v recommended. You should use 2 strings of 6 panels each. Use both MPPTs. Edited June 12, 20242 yr by abd7
June 12, 20242 yr 57 minutes ago, abd7 said: No. You take the VoC of 45.7 x 12 and you are over the max voltage of your inverter of 425v recommended. You should use 2 strings of 6 panels each. Use both MPPTs. Thank you! I really appreciate your guidance in this!
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