SBBS

Can someone please help. I am trying to connect 3 x Pylontech U3000 to Luxpower SNA Inverter. It is the old Pylontech without the C marked. If still have the console port. If trying to connect to Luxpower via Can-bus (protocol 2) then the battery SOC stays permanently on 100%. The SOC does not decrease as battery is depleting. RS485 port also does not work? Does anyone have experience connect Luxpower SNA with Pylontech U3000, and can help me to setup

Can anyone please explain what the setting 20 (green function) of the LuxPower programming What is the meaning of this setting

Thank you for the reply. Can you perhaps elaborate on the type of problems (school fees) you experienced by running the cables together. Almost all photos I have ever seen on installations. There is only one set of trunking. So most installations today run ac and dc cabeling together in same trunking, for at least some portion of the cabeling. What would you suggest would be acceptable (if any) lenght to run ac and dc together. Specially the portion at the between battery and Inverter is sometime unavoidable to run in seperate trunking.

Can anyone advise if solar cables and ac cables can run in same condute or ducting. I was always under impression that ac and dc must be seperated, but is that still the case with todays quality of insulation on cables. If this is a topic that was been discussed already in other threads, then please direct me to those threads.

Can anyone recommend a good repair center where I can take a 4Kw Axpert Inverter for repairs. The Inverter just started to do continues resets when input power is connected, and if I disconnect all power from inverter (input and output), and only have battery power connected to inverter (although battery is fully charged), then the inverter switch off completely.

Can anyone recommend a good repair center where I can take a 4Kw Axpert Inverter for repairs. The Inverter just started to do continues resets when input power is connected, and if I disconnect all power from inverter (input and output), and only have battery power connected to inverter (although battery is fully charged), then the inverter switch off completely.

If I have a 3 phase application, and I am interested in the SMA Sunny Tri-Power 2000TL. Any one tell me, do I need 3 of these Inverter (one per phase), or do I only need one Inverter (i.e does the Tripower have 3 phase output.

I have manged to get the following extract from the installation manual of the Sunny Home Manager. "The grid operator may demand the permanent limitation of the active power feed-in for your PV plant, this means limiting the active power fed into the utility grid to a fixed value or a percentage of the installed nominal plant power. If need be, ask your grid operator whether a permanent limitation of the active power feed-in is necessary and whether you are allowed to use the Sunny Home Manager for this purpose. The Sunny Home Manager monitors the active power being fed into the utility grid via a feed-in meter. If the active power feed-in exceeds the prescribed limit, the Sunny Home Manager limits inverter PV generation via Bluetooth or Speedwire". This answers my question on limiting the Sunny Boy to feed back into the Grid. But my next question is if the Load demands for example 5 Kwatt, but the solar power can only provide 2 Kwatt (due to low radiation and cloudy day), will be Sunny Boy (or Sunny Home Manager), then automatically provide the additional 3 Kwatt from the grid to supply the 5 Kwatt to the load?

If I understand you correctly? I would need a Sunny Island, and if the load demands more power than the solar can supply via the Sunny boy, then the Sunny Island will provide power from the battery and the grid if necessary to supply the load (during high load demands) ?

Can you please tell me if the Sunny Boy can also be configured as a "hybrid" inverter. My scenario is a follow. I stay in JHB (were grid tried is not an option yet) and I do not want to run the risk of doing "anything illegal" such as reversing the meter when the municipality does not allow it. So my question is ... can the Sunny Boy be configured not to feed into the Grid, but still switch to Grid to supply my load if the Solar is not enough (during cloudy days) to carry the load.

Hi Wetkit. Thank you for your reply. I have already agreed in one of my previous posts that I must split up the solar panels per inverter will do that soonest. As far as the rest of the discussion is concern about the if I need to get more solar panels (or another inverter) ...... If it looks like I am confused, then I must admit I am confused. Some of the previous people that posted comments say that the Inverter can not share a 3000 watt load on one inverter between solar and battery. And some other people had comment that it can share the solar and battery on the same inverter (if the load on a specific inverter is bigger than the solar capacity on that specific inverter). For the sake of not repeating the whole previous discussion in this comment to you, all I need to clarify is the following. Question 1: If the inverter can share the load between solar and battery on the same inverter (if the load on a specific inverter is bigger than the solar capacity on that specific inverter) , then I do not need to get more solar panels. Question 2: If the inverter can not share the load between solar and battery on the same inverter (if the load on a specific inverter is bigger than the solar capacity on that specific inverter) , and the other 2 phases need to keep the batteries charged then I do need to get more solar panels. However, I will go with the comment that Viper_za had made (that it can) .... because it is what I want to hear ... lol... then I will not need to add more panels

I am familiar with the parallel option (only what I have read from the manuals), but if I connect the three inverters in parallel, how will I cater for the 3 phases? As you can see I am "exploring" all option not to need to change the inverter, or to increase solar capacity unnecessarily So can someone please comment on the statement from Viper_ZA earlier?

Yes it is still connected to the grid, but the whole intention of having the solar panels (and as much as 18 of them), was to use as "little as possible from the grid" (at least during day time when there is full sun), and to cycle the batteries as "little as possible", intention was to keep the batteries full (during the day when there is full sun), and only cycle then when the sun is low, or during the evening. Now it seams I am screwed and either have to consider another Inverter or more solar panels.

and if for example phase 2 also go greater than 1860 watts, then that phase will also switch to battery, and the solar for phase 2 will also be "inactive". So are then then back at the point made earlier in the day, that I need to add more solar panels to increase the solar capacity to "way more" than 5580 watts (18 x 310 watt panels), even if my load across the three phases will only be max +- 4000 watts (maybe 5000 watts). A figure was mentioned earlier that 3000 watts per phase (that is 9000 watts solar) to cater for +- 4000 watts (maybe 5000 watts) ??

But then it does mean that I will be losing 1860 watts from my total 5580 solar power watts (when for example phase 1 has a load 3000 watts). The other two phases will battle to keep the batteries full (if for example phase 2 has a load of 1500 watt and phase 3 has a load of 1000 watts). Then the surplus of phases 2 and 3 will only be 1220 watts to try and keep the battery full, that is being drained at a rate of 3000 watts (by phase 1). This will mean more cycles. Correct me if I am wrong? All the appliances are 220V

Thank you to everyone in this forum, for explaining and the patience you had with my questions. I must confess that I did not understand the proper working of MPPT until Plonkster explain it, and now I also understand why you must split up the solar panels. If it was not for this forum I am certain that I also would have had damage in the long run on my inverters. I will split the solar panels ASAP, and hope that I have not harmed the chargers (or batteries) yet. But I have one last question (Hopefully) that will put all this in perspective for me. If I split the solar panels between the inverters to have 6 panels per inverter, then I will only have 1860 watts per inverter, and if one inverter starts to draw 3000 watt, then the inverter will switch to battery mode. What will happen to the 1860 watt from that inverter? Will it still be able to supplement the 3000 watt (meaning 1860 watt from the solar and only 1140 watt from the batteries)? If the surplus solar power from the other 2 inverters are more than 1140 watt, then the batteries will stay full, and the effect that Plonkster explain with the DC bus will happen?

Please elaborate more on what you mean by "dip into a battery up to a point". Does this mean that if all three the inverters are setup to charge the batteries from solar, then it will use the DC bus that you referred too to send the surplus solar to the other inverter.

Can you please elaborate more on what you mean by "balance the panels out over the MPPT's". Do you mean (what other on the forum had also said) that I should split the 18 panels so that I have 6 panels going into each inverter

Hi JDP. Thank you for replying. No I do not have a string of Panels per inverter. I have the total 5580 watts bridged before it goes into the 3 x 50 amp DC circuit breakers that feed each inverter. If one inverter draws more than 50 amps from the 76.77 provided before it does into the DC circuit breaker, then the Dc circuit breaker should trip. Currently the inverters is working fine, but If this is wrong then please inform me so that I can rectify before I get permanent damage to the inverters on the long run. What I have observed is that each inverter only draw the required power from the 5580 watts that it needs for the specific load per phase at the point in time. For example, if one inverter draws 3500 watts beacuase the washing machine AND a few other appliances are drawing power, then the other two phases will have only 2000 watts between them. Only if the total load between all three phases exceed the 5580 watts (or what is supplied by solar panels at the time based on cloud conditions), will the inverter switch to battery, or switch to utility if batteries are to low. If this is wrong then my next question would be, if I split the solar panels that each inverter has it's own string of panels, that would mean that each inverter will only have 1860 watts connected to it. So if one phase draws more than 1860 watts then will it start to use the batteries, or switch to utility if batteries are to low? This will mean more cycles out of the batteries, and more running time on utility ( that does not justify savings).

Firstly I wan to thank Mart-mari for the information that she had posted. I also need some advise on this topic. I have a three phase installation with 3 x 4 Kilowatt Axpert inverters (in total 12 Kilowatt), but only use max +-5 kilowatt at any point in time over the three phases combined. I have 18 x 310 watt Yingli solar panels (total 5580Watt). I have done the installation myself as I have an electrical / electronic background, and have taken great care to comply to all Standards and regulations. I have also a COC certificate from a electrician that came and did inspection of everything after I have done the installation, and the electrician did all the connections necessary in the three phase DB board, ( i only did the Solar panel connection, battery connections and Inverter connections). Therefore I can say that almost all of the faults that Mart-Mari indicated is considered in my installation and as per requirements. However the one point that concern me is the point 1 in her list, that " solar connection between inverters must be completely seperate". Does this mean that each inverter must have it own solar panels connected to it, and that you can not share the panels across all three inverters. I have a connector box on the top of roof with the necessary fuses and surge protection, based on how I stringed the panels in series and then in parallel I have three cables coming into the connector box at 25,59 amps each. The fuses that I have used in the connector box is 30 amps. After the strings go through the fuses, it is bused together to combine all the strings in parallel to have 76.77 amps. I then have three separate 50 amp DC circuit breakers feeding each (of the three) inverter so that I can disconnect the solar power to any one (or all three inverters) should I need to. My question is this. If I have 76.77 amps connected across all three the 50 amp DC circuit breakers, and each inverter draw from the 76.77 amps what it needs, is this correct or do I need to have seperate solar panels for each inverter.