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  1. Same conclusion here. Opted to spend a much smaller portion of the initial battery budget, to add more solar panels instead, then shifted high energy loads (like cleaning appliances) to sun hours where possible. Batteries are dimensioned to be sufficient for stage 8 load shedding. Any remaining budget, allocate to debt (like a bond, calculate the interest saving over the same time as recovering cost on the batteries) or investment.
  2. Congrats on the install Gambit! This happened to me as well in 2020, got the system commissioned as the load shedding reduced. There is always that Eskom mains breaker in your DB that can be flicked to the off position in order to simulate load shedding. Pick a stage as per the known schedule and imitate the Eskom incompetence by switching off your utility feed, did that a couple of times myself It actually ended up helping with a bit of troubleshooting and optimisation before the actual load shedding kicked in again
  3. Thanks for sharing TimCam. Having resellers provide sufficient after-sale service would be ideal, as that is in essence part of why they add their markup, but it's far from reality in my experience and looking at sites like Hello Peter, for many people across most industries. In the following instances my reseller/installer couldn't help me and I ended up having to deal with the manufacturer to prevent matters getting lost in translation and spending much unnecessary time due to the middle man: 1. Vehicle purchased from a large independent car sales company (team who was servicing the extended warranty maintained a recurring problem was normal behaviour, I took direct contact with the manufacturer, who eventually managed to resolve) 2. Solar inverter (local team was helpful, but pointed to wiring problem when fix required a firmware update which I pinpointed with the manufacturer's tech support, saved the re-wiring effort) and batteries (multiple local resellers said Pylontech US3000 and UP5000 were the same apart from capacity, which was incorrect, contacted Pylontech themselves who provided confirmation of the differences in design and thus warranty) 3. Smart plugs that couldn't connect to my WiFi network, resellers blamed the wifi, then I contacted the manufacturer who confirmed Asus Smart Connect not supported by the plugs 4. Replacement projector lamp where resellers maintained the replacement bulb used was of the same specifications as the OEM. Manufacturer confirmed otherwise and bulb had to be swapped. 5. Hard drive compatibility in a surveillance DVR, which the resellers maintained would be fine, yet the drive purchased after checking with them, didn't work. Confirmed by the manufacturer not to be supported. The good manufacturers, resellers and installers that I've dealt with, have welcomed my contact with the manufacturers for joint troubleshooting and learning between all parties. The potential of wasted time and added frustration introduced by not having direct contact with the manufacturer, is not an option for me. As it stands, this unfortunately rules out Sunsynk.
  4. Still no response from the Sunsynksa.co.za team after the multiple attempts to reach them on multiple email addresses. Forwarded the same email to the Sunsynk.com team, who responded the next day, unfortunately without answering any of my questions though, but with readily available PDF product information instead. Dealbreaker for sure.
  5. Also, referring to the heading in the wiring diagram, 'DO-IT-YOURSELF BY YOURSELF' is a massive selling point
  6. Good to hear, thanks. Also won't be using it all the time, only to switch to my Goodwe ES inverter for backup during load shedding. The aim is to bypass inverter backup the rest of the time in order to do away with the essential load capacity limitation while there is utility power. I'm noticing now that the ATS model I see online seems slightly different in appearance, referring to PV & Inverter instead of generator, as the alternate power source. Link below. Based on your experience with the brand, I might just give this a go. https://e-glow.co.za/products/ats-toq5-63a-ac-2p-230vac-tomzn
  7. Thank you for sharing. Checking in more than a year later, how are these units treating you? Would you recommend this model or something else?
  8. As far as customer service goes, poor start with Sunsynk unfortunately. I emailed them on two email addresses ([email protected] & [email protected]) with some questions regarding their 8KW inverter, initial mail sent on 18 June with a reminder on 29 June. More than two weeks later, no response... This isn't even for a problem experienced, but for a prospective buyer instead, hence a reply would be much easier to provide.
  9. This is a pity. I can understand that the manufacturer may want to limit the amount of support requests, but there is also an opportunity for more substantial, direct feedback and eventually product improvement and customer satisfaction, when having contact with the end-user. The installer would mostly be the middle man, acting as a relay, delaying the process if the manufacturer has to answer in any case. Thinking of my interaction with multiple installers, once they got paid and the installed system is mostly functional, getting them to prioritise queries, especially for optimisation instead of alarms, while they're busy making money from the next installs, would be a protracted if not futile exercise. This is where direct contact with the manufacturer could be pivotal to a good user experience. Currently I have a Goodwe ES inverter and am in regular contact with their support team. They differentiate between installer and end-user support. Now some might say they don't need to contact the manufacturer for support because their inverters work. So does mine, but by monitoring and discussing potential performance enhancements with the manufacturer, we're close to realising a 10%+ performance increase from the standard configuration during deployment. At the moment I have an ongoing support request with them that will determine whether I remain a Goodwe user or need to change brands, hence investigating Sunsynk. How is the fan noise with a Sunsynk inverter? Some friends and family have Victron Multiplus II inverters and the fans are disappointingly loud for such premium grade pieces of equipment, which really could have included premium grade, quieter fans, especially since those do exist. My inverter is situated right next to a home office and the Goodwe is completely silent, which was one of the reasons for getting it in the first place.
  10. From those with experience using the Sunsynk brand, any reasons not to opt for a Sunsynk inverter / any inverter brand you would recommend instead based on your experience? Reliability and after sales support (also for monitoring, optimisation and answering queries) are crucially important to me.
  11. I just started doing some research to see if it's worth opting for a Sunsynk inverter. These sound like the type of problems I don't want to have to deal with... Would be great to hear if anyone would indeed recommend this brand.
  12. Much appreciated, thanks @Coulomb. The inverter is indeed set to SUB as you suggest. As for the battery voltages, for now I've settled on the values in green.
  13. I'm noticing that Victron specifies the following for these same batteries: https://www.victronenergy.com/live/battery_compatibility:byd_b-box Your absorption voltage aligns with theirs. They have the float voltage at 55, which is only 0.2 less than the absorption voltage. Is this fine? Currently mine are now set as per the yellow section: It's worth mentioning that I'm not using these batteries unless the utility power goes out. There isn't enough capacity to use in the evenings and then make it through loadshedding. The aim is to keep the batteries full and use only during loadshedding here in South Africa. I would of course want them to provide maximum runtime without voiding a warranty or causing damage beyond standard degradation. Are there any risks associated with using 56V bulk like I'm doing now? Should I also lower to 55.2 and if so, could my float be the same or 55 like Victron suggests? Could you please help me understand why your float voltage is at 53.7?
  14. Much appreciated, thanks @Coulomb. You mention: "So I'd use 52.5 x 16/15 = 56.0 V and 51.8 * 16/15 = 55.3 V. (Personally I use 55.2 and 53.7 for my 16S LFP home-made system)." What is the reason you are opting for the lower voltages on your 16S system and would you do the same with these BYD batteries?
  15. Hello Everyone The installation has been completed and the panels are working fine with the inverter as per above discussions. Thanks for all the input. The 2x 2.5 kWh BYD batteries are being managed by the Axpert King (series one) with setting 5 = USE. Currently the 2.5 kWh Pylontech US2000 settings are being used, as recommended by the installer. I do however notice differences in the battery specs between Pylontech and BYD and am curious to know if any of the experts here can let me know what values you would use for the BYD batteries instead? In the attached table, the settings in question are marked in yellow. @Coulomb was hoping you would perhaps be able to provide guidance, especially on the optimal Voltage settings, since it seems you know these Axpert inverters well. Also attached is the spec sheet for the BYD batteries that will remain in use with this inverter. Thanks 0 |>\/\/3|<|<3Я BYD U3A1-50P-A Battery.pdf
  16. Hello Team Hubble Are you able to share independent test results on your batteries, similar to the reports available at the following links? https://batterytestcentre.com.au/reports/ It sounds like the leading Pylontech performance as per those reports has convinced many to opt for their batteries. If you don't have such test results handy, are you planning on submitting your batteries to obtain same anytime soon? It would be great reference and sales tool, given a good outcome.
  17. Thanks Calvin for your valuable input to question 1. If anyone has experience using BYD LiFePO4 batteries with an Axpert King inverter, would be most appreciative for input to question 2.
  18. This helps a lot, since the max power current would be higher than what I'm planning for, thanks Calvin. To check that I'm using the same or at least a similar panel for my calculations, from a Google search I found a 365 Watt Canadian Solar polycrystalline panel with the following specs: Opt. Operating Voltage (Vmp) 39.8 V Opt. Operating Current (Imp) 9.18 A In 2S6P configuration these would run at roughly 80 Volts and 55 Amps. Does this correlate with your readings?
  19. Hello PowerForum Community Question 1: Does anyone know whether there is a specified MPPT max input current for an Axpert King 5K inverter? I cannot find it specified anywhere. For comparison, my Goodwe GW5048D-ES has a specified max input current of 11 Amps per MPPT. Data sheets for both inverters attached for easy reference. For the Axpert King 5K, max PV array Watts (4000) / max Open Circuit Voltage (145) = 27.5 Amps. This would however assume using the max Voltage. I like to know whether I can use a higher input current with a lower Voltage. In essence, would it be feasible to use 8x JA Solar JAM78S10 455 Watt PV panels in a 2S4P configuration: 2x panels in series (max 2x 54 = 108 Volts) x4 sets in parallel (max 4x 10 = 40 Amps) for a theoretical max of 4320 Watts? This would only exceed the inverter max PV array Watts of 4000 when the PV array works at 92%+ of rated maximum power. Question 2: Has anyone used BYD U3A1-50P-A 2.5 kWh LiFePO4 batteries with the Axpert King 5K inverter and if so, is the BMS compatible or does one have to rely on Voltage measurements with setting 5, Battery Type = USE? Please help me in case any of my calculations and/or related logic is incorrect. Data sheets for the solar panels and batteries are also attached. Thanks in advance 0 |>\/\/3|<|<3Я FCS-Axpert-King-3Kva-5Kva-Data-Sheet.pdf Goodwe_ES_Datasheet-EN.pdf JAM78S10-455-MR.pdf BYD U3A1-50P-A Battery.pdf
  20. Very handy desktop app for real-time information in a single view. There is no PV master app for the desktop. The only option for the desktop is the SEMS portal, where the interface requires navigation and feels delayed. This is not a replacement for SEMS but a welcome addition. One could consider it the PV master option for desktop use.
  21. Thanks @Coulomb. The supplier has in the meantime also indicated that the relay is likely to be the problem. The inverter is heading back to the supplier tomorrow for repairs under warranty, since it's less than 6 months old. Once concluded, will share my experience with the supplier here to help others purchasing in South Africa.
  22. I have an Axpert King 5K inverter bought 5 months ago. As per the user manual, output source priority setting 01 = USB, operation logic setting 10 = ECO and bypass function setting 23 = BYE so that "inverter can work in bypass mode if utility is available". This worked well for a couple of months with the inverter letting the utility power my house, switching to the batteries only when the utility is not available. Recently, for about two weeks now, when the inverter enters bypass mode, the inverter screen shows that the bypass function is active yet no power reaches the house, despite utility power being received and used for charging the batteries, also confirmed by the inverter screen. When disabling bypass mode (setting 10 = AUT and setting 23 still = BYE), the power is restored but loads cannot exceed the inverter's maximum rating of 5KW. Bypass mode is required for larger loads when the utility is active and battery backup is not required. Else we remain limited by the inverter's capacity when actively supplying power. My aim is to get back to the point where the inverter is bypassed when there is utility power and/or high load. Any help would be appreciated, thanks.
  23. Hi @Coulomb, hope all well. Replying to an old thread I know The limit in bypass mode is interesting for me as I rely on my Axpert King to simply enter that mode when there is more load than what the inverter can handle inline. What is the maximum load in bypass mode for an Axpert King 5KW and where can I find / how would I calculate that please? From the user manual regarding the breaker sizes: "The recommended spec of AC breaker is 30A for 3KW, 50A for 5KW". I do not see the any specific mention of or specification for "relay". I have 50A breakers installed to and from the inverter, per the manual. It has 0ms failover when used inline with loads below 5KW and switches to bypass mode with larger loads. At times, switching to bypass mode doesn't work, e.g. the power simply cuts out completely, even though the inverter shows bypass to be active. When disabling bypass mode, the power is restored but loads cannot exceed 5KW.
  24. Thanks for all the great input folks. I think this suggestion makes the most sense.
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