ryanb

I'd like to know whether it is possible to integrate a Solis PV inverter (S5-GC25K for example) with an existing Sunsynk system (2 x 12kW 3ph inverters in parallel, 3 x 10kWh Sunsynk batteries)?

Hello all, I have an off-grid system, where I am wanting to make use of the AUX/GEN port as the non-essential supply. So in that case, I am wondering whether I can connect the generator to the grid port? My understanding is that the GRID and GEN port share a common bus (once the isolating relays close). I don't know if there is any electronics on the GEN port which is specific to handling a generator input? My sense is that this would work. Thank you, Ryan

Hi Bryan, Did you ever get any more information on this? I'm busy with a similar install with 2 x 12kW 3ph inverters in parallel, and have just installed the CHINT meter, but had some strange readings, so want to check with someone who might have done this installation sucessfully.

In the datasheet for the 8.8kW inverter, under "installing the CT Coil", we find the attached diagram. And the instructions in this diagram seem to indicate that the arrow on the CT coil can EITHER point in the direction of the inverter (bottom right), or towards the Grid (bottom rectangle) So I think this might be the cause for a lot of confusion. I first installed pointing towards the inverter, but am receiving negative current flow, when current is flowing from the grid to the inverter. So I assume then, that the CT coil is pointing in the wrong direction? What is even more confusing, is that the diagram indicates an arrow on the CT coil (encircled in blue dashes) pointing towards the left, yet the CT coil with the Live wire going through it would have the arrow pointing towards the right (I assume). If so, why make instructions so ambiguous Sunsynk? Does anyone know if swapping the white and black wires at the inverter will also change the direction of current flow? Thanks in advance, Ryan

Does anyone have the RS485 pin-out for the Axpert inverter Li-Ion port?

Hi all, I have a farmer who is wanting to run a combination of borehole pumps from an off-grid 3-phase Sunsynk system. The maximum power drawn from the combination of pumps will be 12kW, and the startup of the pumps will always be staggered. So lets assume two 6kW pumps. Would 3 x 5kW sunsynk inverters be adequate to start and run these pumps? I understand that pumps surge up to six times their rated current on startup, I see that the inverters can deliver twice their power for short intervals. Are these the metrics to use? My sense is that the inverters might struggle a bit to deliver full current (and hence voltage), but is that really an issue? It might just mean that the pumps take a bit longer to start. Any suggestions would be greatly appreciated.

Hi Dom, yes it does work. The advantage of powering the geyser on the output side of inverter, is that you can still heat your water during load shedding.

These I have set to 100%

Ok... from the manual battery activation says : "Active battery - This feature will help recover a battery that is 100% discharged by slowly changing from the solar array. Until the battery reaches a point where it can change normally." -- So I thought this would only apply if one had a solar array

Yes Is this the battery restart SOC setting? Yes, I have this set at 25%. No, I have timer enabled and have ticked all the grid boxes for all the times 25% Thank you

Hi all, I have three 8kW Sunsynks connected in three phase with 30kWh of battery storage (6 x eTowers batteries) - there is no PV connected to the system presently. The system is used to run some pumps on a farm. If load-shedding extends beyond the 2 hour mark, then the inverters reach the 15% SOC shut down setting (configured in battery setup page), and turn off. My sense was that when the grid returns, the inverters would naturally begin charging the batteries up again, but this is not the case. The inverters stay in the shutdown mode. Even when I reset the Alarm (toggling the On/Off button), the inverters do not automatically start charging the batteries. I need to go into the battery settings and reduce the shut down SOC settings in order for the inverters to go back into "Normal" mode and start charging the batteries. Is there any way of setting up the inverters in UPS mode, so that they automatically start charging the batteries when the grid returns, even if they have reached their shut down SOC? Many thanks, Ryan

Hi all, Below are some PV specs for the Sunsynk 8kW inverter : I would like to put two strings of 545W JA Solar modules in parallel going into ONE MPPT. The PV modules have the following specs : Isc : 13.93A Imp : 13..04A So if we have two strings in parallel, then we have : Isc : 27.86A Imp: 26.04A Question 1 : Is there any danger is exceeding the PV input current? Do the MPPTs limit themselves to 22A. Question 2 : If there is no danger to question 1 AND I don't exceed the maximum input voltage of the MPPT, is there any limit to how many panels in series per string? I've calculated that the max is 9 panels in series per string. So could I theoretically put 2 strings of 9 panels in parallel, going into one MPPT? Thank you, Ryan

Hi @GreenFields, Many thanks for taking the time to respond in such detail - it really helped to clarify my understanding. I have a few more comments and queries in response to your post (and all these questions pertain to scenarios while grid is not present) : For clarity, is this "solar power" setting a minimum solar generation value? So in my case would the MPPTs need to be harvesting a minimum of 4000W before it considers switching power to the AUX port? I always thought this was a maximum value, and hence my confusion. So if the battery SOC is at 100% AND there is more than 3000W of PV generation, I would assume that the AUX port would be active. Then, let's assume there was some temporary shading from a cloud. Would you expect the AUX port to switch off during the shading? I also found the attached document which was very helpful. Best regards, Ryan AUX LOAD Sunsynk Explanation.pdf

Hello, System : 5kW Sunsynk inverter, 2 x Pylontech US3000C, 4 x 460W panels (East-facing - MPPT1), 4 x 460W (West-facing - MPPT2) I have a 3kW geyser connected to this AUX output, and I have set AUX LOAD ON to 100% and the AUX LOAD OFF to 80%. I have set 'Solar Power' to 4000W . I have noticed often when the batteries are 100% full, this AUX load is not active, and I'm hoping to understand which conditions could cause this behaviour. This happens even when there is no load on the main "LOAD" output. a) Could someone possibly explain what the "Solar Power" setting actually does? b) Is this aux load functionality dependent on excess solar energy, or only on battery energy? c) If there is no load on the normal "LOAD" output, could the Sunsynk theoretically provide up to 5kW on this AUX port? Thank you, Ryan

hi all, According to the manual, this inverter can "bypass" from grid to AC loads. Does anyone know more about how this 'bypass' is achieved. I am told that the max bypass power is the same as the inverter rating - 5kW. I would normally assume that the bypass functionality is achieved via some form of contactor. If this is the case, why would Kodak limit the bypass power output to 5kW? Secondly, in the attached snippet from the Kodak OG Manual, it says : "If “SUB” (solar first) is selected as output source priority and solar energy is not sufficient to provide the load, solar energy and the utility will provide the loads and charge the battery at the same time." My understanding of this, is that the utility AND the solar energy (being the DC to AC hexagon) will be combined to support the AC loads. But I am told by the representatives that its either the utility OR the inverter which supplies the AC loads. So effectively, the inverter cannot synchronise with the utility. Does this sound correct?

Thank you @PowerUser and @Solar_buddy, I feel confident enough to drive the relay coil from the ATS240 port triggered by 'Signal Island Mode', and at the same time, make use of the AUX port for dumping energy. To answer your question about wiring @Solar_buddy, I would say yes, that is how I have wired a system, without any issues

SunSynk Training Manual Version 1.2 (10/26/2020) page 45 and 46, under heading "6.4.1 EARTH BOND RELAY"

The SunSynk datasheet (snippet attached) stipulates that one cannot make use of the Gen/AUX port if one is using the ATS240 earth bond functionality. Does anyone have an understanding as to why this would be? I would like to : 1. Have the safety of an earth-neutral bond when in Islanding mode (how important is this anyway?) 2. Configure the inverter to dump energy to the AUX Load when batteries are charged. If this is not a viable option, could one perhaps drive the coil of the earth-neutral bond relay directly from the grid, and then still make use of the AUX Load? Thank you

Excellent, thank you.. Good to know because the data-sheet doesn't seem to show this spec

Thank you, I have one more question : Can the Sunsynk (5kW model) deliver more than 5kW to the LOAD port. For example : If the inverter is generating 3kW from the battery, and the grid is also supplying 3kW. If so, what would be the maximum continious output power on the LOAD output? Thank you Ryan

Hi all, Could someone please confirm whether the below scenario would be possible with a 5kW Sunsynk : a) No PV coming in (lets assume its night time) b) Inverter set to supply a maximum of 3kW from the battery c) Grid connected, supplying 1500W d) 4500W of power being delivered to the 'LOAD' output Thank you! Ryan