Sc00bs

If you can run it like that, I don't really see any major benefit of having a grid tie connected to the Aux port.

@Achmat @Leshen Regarding feeding in to the AUX port with a grid-tie, is it not possible to just have the grid tie inverter on the load side of the inverter rather than going in through the aux port? The grid-tie would sync to the Sunsynk and the Sunsynk sync to the grid when it is there. You just need to set it up for "0" grid backfeed. The Sunsynk could then focus on charging the battery and it would have the advantage of, in the case of load shedding, the grid tie would be able to carry on working?

Part of Elon Musk's vision is the ability to use your car's battery to sell power to the grid when the prices are high and charge it when the prices are low. Prices would be variable based on supply vs demand, so on days with no sun/wind the price goes up etc Can you imagine the grid if everyone has 100kw/hr of power sitting in their garage that can feed back into the grid during high demand times.

If it starts clipping @ 22A and you are sitting at 248v that would be getting 5456W out of that mppt (4464W@18A). Either way I reckon you would probably be over 7kw total before you see any clipping.

Added 4 x 455w panels this morning to my North/West string, so it is now sitting in 2P8S where it used to be 2P6S. As expected my amperages have stayed almost the same @ +-16.1a but my voltages increased from 266V - 367V which is spot on. Max yesterday was 3.79kw & today was 5.06kw which is almost exactly 33% 🙂 Should equate to about another 6-7kw/hr a day with the current winter sun. Will only get power clipping when we get back into summer but that is not really an issue.

From what I understand you can over wattage the MPPT quite safely as the inverter can control the power it is accepting by increasing the resistance which will reduce power. It can't do the same for voltage. The BIG thing to watch out for is over Voltage. I would be very worried sitting a 492V that I would get a spike over 500V and fry the MPPT. Voltages tend to spike during very cold panels and high solar power. Max per MPPT is 500v @ 11A 5500w. The voltage on my panels goes up very quickly so I don't think that you would loose much time getting to over 150v if you put 6 panels in per string, my main concern would be a voltage drop if you cables are long or too thin, would make sure you use at least 6mm cables so probably better/safer to go 2 x 6-10 panel strings.

If it's the same guys I spoke to some time ago, they only deal in bank transfers/cash, no payment by credit card which immediately makes me suspicious of their 10 year warranty!

I have a Sunsynk 8kw, currently have 24 x 455W JA Solar Mono panels installed in 2 x Strings in a 6S2P config. VOC 53.47v and 10.56 Short Circuit Amps Is an East/West configuration and I am getting +-40kw/hr a day and hitting a peak of 7.06kw today and averaging about 6.2kw during the day. Looking at my last 30 days of data My maximum voltage is currently hitting 288V & Amps 17.3A on the West String (So no clipping of any Amps at the moment) I am planning to add another 4 panels onto my West String and another 2 onto my East String (not enough roof space left! This should give me an extra +- 20% power according to my calculations which should be about 50kw/hr a day in winter, not sure what it will hit in summer as I only installed at the end of summer this year. Good luck, look forward to seeing your data, would definitely be hesitant to go to close the the voltage limit

All sold 🙂

Hi Does anyone know who makes this system? Am going to need to get some more and am trying to figure out who makes it.

What do you want to use it for, out of interest?

You could probably order it of alibaba.com, they have a shop there https://cn1524225498fqks.en.alibaba.com/?spm=a2700.shop_plgr.88.16 https://cn1524225498fqks.en.alibaba.com/product/1600243615314-818239417/Seplos_24V_48V_16S_150A_Lifepo4_lithium_battery_protection_board_LFP_Cell_Balance_Integrated_Circuits_BMS.html?spm=a2700.shop_plgr.41413.20.3bae1c50oUML97 If they won't ship to you directly in SA, get a Chinese shipping agent to handle it for you.

Thanks @phidz , you are 100% correct, just got off the phone from Sunsynk support and they confirmed that it is not an issue as long as the voltage does not spike over 450v

Plug it into the Aux port and set it to micro-inverter

Found the video @phidz seems to be pretty conclusive

Thanks @phidz Will see if I can find the video

Thanks @phidz , Wow, so it isn't going to damage anything as long as my voltages don't go to high, that's good news. I thought that I was a risk of damaging my inverter if I went over 10400w. Will send Keith an email just to get official confirmation before I make any changes but that really would be first prize.

Other alternative is just to go a grid tie which I suspect is probably the safer way of getting more power 🙂

Hi Everyone, Calling on the PoweForum hive intelligence 🙂 At the moment I have 10,900W of panels in an East/West split, very slightly over the max DC Power allowed on an Sunsynk 8KW inverter (10,400W) which doesn't seem to be an issue due to the split. The inverter has Dual MMPT's which can handle a max of 18A & @ 425V (apparently can go up to 500v) or 7650W on each MPPT. Combined this is obviously well over the 10400w limit. My idea is that I can add a 4 extra panels to each string (2s2p), staying within my MPPT restrictions and monitor my DC power on the inverter. If my combined Max power generated goes over 10,000W I can automate a disconnect of one off the strings using HASSIO. Has anyone seen any Smart DC Disconnect switches? If not, was thinking that I could use a suitable SSR controlled by an Arduino/ESP32 Anybody have any alternative ways of doing it? 🙂

Hi What is the state of charge on your batteries? Are you sure that the inverter is giving power to your house? I would guess that the inverter is charging your batteries up to 100% after the night and then bleeding of the power as it has nowhere to go.

Am leaning towards a 4kw Solis to give me some extra power, they seem like well made units and according to my calculations and extra 4kw will definitely be enough extra power. Was just considering the thought of getting something that could give me some extra power when the sun goes down if necessary/possible

@Buyeye I am averaging 35-38kr/hr a day at the moment, I have an East/West Split peaking at around 7.5kw. My initial thought was to just add an extra 8 x 455w panels, 4 on each of the strings to give me an extra 33% power, I then realised that I would be over the max DC power my inverter can handle when the sun's strength picks up again so have been looking at other options. Would be happy if I was making +-50kw/hr a day in winter, Would also be interested to know what the average production difference is between Winter and Summer. The system has been running since April and the max I have ever got in a day is 43.80kw/hr, although I suspect that there was some clipping due to my batteries being full and my loads not being switched on intelligently enough. So I guess would have probably made closer to 50kw/hr if I had had capacity. I am now using node red to cycle my heavy loads so as to ensure I don't push to close to the limit. My monthly production for April was 992kw/hr, May 1070kw/hr & June 963kw/hr.

@Buyeye I currently have 2 x 6kw BSL-Batt Bull Batteries & a Sunsynk 8kw with 24 x 455w PV panels Primarily I would like more PV Panels, another 3-5kw would be handy, I understand that the limit on the grid-tie port is 5kw. My understanding is that upgrading the existing storage on my Sunsynk would mean buying either 6kw or 5kw BSL-Batt batteries as you can't mix vendors and sometimes even battery models depending on the BMS's installed (could be wrong, not 100% sure but that is what I have been told so far) I am not buying any more batteries right now so the new inverter would be run as a grid- tie initially. My thought was that if it is possible to add a hybrid inverter to the grid-tie port for the extra power then it may also give me the future option to add some extra battery storage from another battery vendor.

You can tune it, so if it regularly under forecasts you should be able to correct it.

Was thinking that using a Growatt as it may give me the option of adding some more cheap battery storage to my existing system if required as well rather than a purely Grid Tie inverter like a Solis