SpankyZA

Monster install! What are your loads?

Hey @Swaziii My apologies for missing this. On the off chance that you haven't resolved things yet, the required info is available on Hubble's Website.

Yea, that does not necessarily mean it'll just work. There are infinite combos of inverter + battery out there. From my experience, the bundled cables are intended for paralleling of that specific component, be it the inverter or the battery.

For sure. I am going to email Sunsynk support to try create extra awareness on the issue.

Thanks for the quick response. Okay, so it must be more widespread than just the 8kW + Ecco combo, because I have the exact same behaviour you described in the OP but with 5kW + Hubble. I am also not using any PV currently, and everything is on the UPS/load circuit.

Are you using a fully populated ethernet cable (all 8 pins wired)? I had this issue between Sunsynk & Hubble AM-5 - the issue was resolved by making a custom ethernet cable, to Hubble's specifications. In the case of the Hubble, only 3 of the 8 pins required population when using CAN protocol, and only 2 of the 8 when using RS485 protocol.

Hi @TheV - have you managed to get clarity on this behaviour? I'm seeing the same constant power draw to the battery @ ~22W, even when the battery is 'full'. I have a Hubble AM-5 battery, which is different from your setup, so this suggests the quirk lies with the SunSynk.

Keep an eye on this thread. You are not on the latest - there are newer versions out for master & comms for the 5kW Sunsynk.

Happy to report that the build went well and the system is working flawlessly! Took two full days to complete. Chuffed!!! Worth noting that the Hubble AM-5 documentation doesn't really make it clear that a custom comms cable is a necessity - so I struggled to get comms going between inverter and battery until I made up a custom ethernet cable which was only populated with Pin 2, 4 & 5, on each end. The physical manual received in the package is also outdated compared to the online version, and both, in my opinion, are a bit lacking in clarity on certain aspects. There are even some inconsistencies which creates uncertainty. It would also be have been great had the included comms cable been explicitly labeled "battery-to-battery comms only". Anyway, bar these issues, it wasn't too hectic to build the whole UPS and I am glad to be rid of loadshedding at home This forum's historical threads also helped me a lot - a great reference when in doubt!

Managed to get some clarity on the wiring in the meantime, so 1x Sunsynk 5kW, 1x Hubble AM-5 & 1 x DC Isolator/fuse in the post 😁 First time Solar-Shop.co.za user and so far, the experience has been good. The website is great and response to support email address is prompt. Excited to receive the goods and complete the build! Just to source a sub-db or two as well as some professionally crimped battery leads.

So I've managed to get certainty on the my second question in the OP - The Blue Novas do in fact require the BMAC to communicate with the inverter. This knowledge has me moving away from the Blue Nova. Just seems like an unnecessarily complex and cost inefficient way to do things. I'll likely just go with a Hubble AM-5 for the simpler comms and better C-rating. The last bit of uncertainty now lies with the earthing situation, on inverter output, when using a wall plug as input, but I will hopefully get some certainty on this soon.

Thanks @JayGee for the comments. Your setup looks to be practically identical to what I envisage mine to be! Which model inverter did you buy initially? Does it have feed-in capabilities at all? It would appear that you didn't run into any of the concerns that I thought might be an issue - does this simply come down to Inverter type/features? Which inverter would you consider now that you know more? Did you wire in any safety stuff such as DC fuses etc? I'd appreciate any further insights.

Hi everyone, New user here, hoping to pick the brains of those more knowledgeable than myself Poked around a bit but haven't stumbled across any discussion on quite like what I want to do. I'm looking to build myself a UPS system, but I currently live in a flat in an apartment block, so any kind of DB integration is out of the question. However, I'd like to buy components now such that I can meet my immediate needs in the flat, and then just move these components into a house and properly integrate into the DB when the time comes. At this point, I'm thinking of a system 5kW inverter & 5kWh battery, installed in a portable server rack - plugged into a normal 15A wall socket to charge the battery via inverter. Some loads will be directly on the UPS at all times, and others will be added via extension cord as needed during loadshedding. For the battery I'm looking at the Blue Nova 5.12kWh/48V LiFePO4 (the BP variant) For the rack I'm looking at a simple 12U rack on castors For the inverter I'm looking at the SunSynk 5kW/48V Hybrid Inverter (Looks to be a decent future-proof option for future 'Phase 2' plans) I have two uncertainties: 1) On the inverter choice, I'm concerned that since this is a hybrid unit, I will have issues using the wall socket to supply the inverter and that this isn't a feasible option since I can/should never 'feed back' into the circuit in my flat. Reading the Sunsynk's manual leads me to believe that it'll always feed a bit back into the grid and that this inverter is only suited to an integrated type install? This bit is very fuzzy for me and I'd appreciate if someone could elucidate the functioning here. 2) The requirement of the BMAC unit so that the Blue Nova can communicate with the SunSynk properly. One would imagine that it's just a comms cable from battery to inverter but it seems that isn't enough with the Blue Novas? Tried to keep things short, so let me know if you need any more info... Kind Regards, Kyle