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@power.saver - You are my savior. How stupid of me ! Indeed the phases were reversed. Makes total sense now, Thank you so much.

AC2 is the grid, AC1 is the load side

I have added a couple of other pictures showing more details about the setup

I have not been on that forum for a while. I have finished my Solar Setup along with the Battery Backup. I am using a AC Coupled System with 22 Enphase inverters and 2 SMA 6048 Sunny Island. I am also using the same Transfer Switch panel that has been talked about in that thread. I have...

I ended up having to switch to Sunny Island as my AHJ would not move on the UL requirement. I also decided to choose the Batrium BMS and I will include a 300A ABB DC shunt trip breaker at the output of the battery. I have a generic questions with regards to BMS turning off either a contactor or...

I am now facing a new issue. I submitted my Battery Backup plan to my city and the reviewer is now asking for UL Certification of the 15kW Inverter. I reached out to Sigineer and they do not have it for any of their product. Does anyone know how to get a 12kW/15kW UL Approved inverter ? I have...

Yes. The 100A input and 80A output will have the wires rated for these Amps.

Thank you. Actually after looking at a few YouTube videos of the 15kW inverter, it looks like the Input breaker on AC is 100A and the output breaker is 80A. So I guess the bypass mode is not a True input/output bypass but some of that power is meant to be directed to charging the battery. I...

Thanks. I am not using the Tesla Module but 280Ah LifePo4. I have a 1P16S scheme and the discharge rate of my battery is 1C. So I would be expecting a max. discharge of 280A. I am planning on getting another 16S in the future. I also have a Chargery BMS to keep the cells balanced and 2...

Indeed, I meant Contactor. Thanks for the explanation on Curtailing. I have the same setup as yours with MicroInverters that will go off when reaching overcharged. I have added 2 additional safety relay on the battery side along with my BMS for overcharge and undercharged. Probably overkill but...

Thanks for the response. I indeed misunderstood the battery priority. I wonder why people would want to use that mode then. I think I will go with the Relay scheme you suggested. For your 12kW inverter, did you use Copper 250kcmil/75 deg wire ? Is it ok to use THHN ? I am not sure what you...

I have a few questions related to the Sigineer inverter: - Are you still happy with it ? I am planning on buying the 15kW 48V. Wanted to check if that is still a good buy or if there are better option for a split phase 120/240v system - The documentation recommend 10 to 5AWG wire to the AC...

Hello, I have a follow up question for this. As I see on your diagram, you have an 80A breaker for the Inverter OUT (Either Grid or Battery). Yet, you house panel is 125A. Are you assuming that you can cover the 125A demand with the 80A plus the 80A Solar ? Is there a case at night for example...

So I assume you use the Inverter in Battery priority mode ?

Hello, A quick question. I am doing the load calculation for the ATS panel. How many watts did you allocate for the 12KWh Battery Charger ? Or how many amps at 240v will the charger use to charge the batteries ? I am assuming that it is limited to 19kW which would mean around 80amps which is...

Yes. Definitely, Thank you very much. Great setup.

Sorry for asking more questions but in the inverter manual, it states: PreventingParalleling of the AC Output The AC output of the unit should never be connected to the utilitypower / generator. Such a connection may result in parallel operation of the differentpower sources and AC power from...

Ok. That makes total sense. Thank you.

I have a quick question on the external ATS Setup. On Amazon, the ATS Switch seems to come with 125A breakers for the switched legs. Did you downgrade the breaker on the leg connected to the Out of the 12kW inverter to 80A ? (19kW of PassThru power) Did you add a 80A breaker in the Main section...

Never mind - Saw the reference in an earlier post. Tx

Very Cool. What external ATS are you or do you plan to use ?

This is a fantastic post. I like the external ATS implementation. Indeed, the inverter has its own ATS but I believe it is limited in term of AMPS that can go through in pass thru mode. Does anyone know what is the limit on the 15KW Inverter ? Also, have you thought of automating the ATS with...