6 MWh SRNE ASF48100U200-H 10kw.

Crowz said:

Can anyone honestly come up with a REAL reason to run comms aka bms connected to the inverter vs non comms?

My batteries cannot do comms and I haven't ever stood in front of my inverter saying "Damn I wish I could connect my batteries bms to my inverter"

The victron shunt has a dead accurate SOC that is what my system uses to know the SOC. BMS's are not accurate at ALL on SOC. So again is there a REAL reason? Any reason?

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Is there a reason?

Yes, it is for those people who desire a challenge in life to get it working without failures.

I do not have a reason for inverter/BMS comms, I like life simple.

Only reason for me would be the ability to monitor, change settings and remote reset the systems no matter where in the world I happen to be.
All from one device with secured remote login capability NOT written by nor designed by chinese and other companies that are prone to include special gift embeded in some of their software....sigh... just my opinion btw.

Zwy said:

Is there a reason?

Yes, it is for those people who desire a challenge in life to get it working without failures.

I do not have a reason for inverter/BMS comms, I like life simple.

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Using built-in BMS communication does have the benefit of less hardware (doesn't need a smart shunt or external agent reading SOC to get usable SOC-based inverter control). One poster also mentioned a situation where his BMS detected internal hardware fault and was able to quicker alert the inverter to stop charging.

uslsml said:

Using built-in BMS communication does have the benefit of less hardware (doesn't need a smart shunt or external agent reading SOC to get usable SOC-based inverter control). One poster also mentioned a situation where his BMS detected internal hardware fault and was able to quicker alert the inverter to stop charging.

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BMS SOC is unreliable, that has been shown repeatably in these forums.

Using SA with a Smartshunt allows more accurate SOC monitoring, I know it is accurate because I run a Batrium BMS and it uses a shunt too for SOC monitoring and both shunts agree.

I would not want a BMS to shut down all charging if there was a hardware fault, I would want the BMS to shut down that battery both charging and discharging. I've had critical faults occur with the Batrium and it will trip the shunt trip ABB breaker basically shutting down my whole system unless the charge controllers can supply enough PV power to the DC bus. That has it's risks though.

If you are gone for the day and had not remotely checked on the system, it sucks when you walk in the door and find the system shut down and batteries that won't power thru the night. In winter, a cold house and furnace not running. For that reason, I am adding another battery with a JK BMS so at least one battery or the other is online.

Badbyte said:

Only reason for me would be the ability to monitor, change settings and remote reset the systems no matter where in the world I happen to be.
All from one device with secured remote login capability NOT written by nor designed by chinese and other companies that are prone to include special gift embeded in some of their software....sigh... just my opinion btw.

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SA and use a Smartshunt with it. You can check SOC, load, PV power and change inverter settings with SA from anywhere with web access.

Zwy said:

BMS SOC is unreliable, that has been shown repeatably in these forums.

Using SA with a Smartshunt allows more accurate SOC monitoring, I know it is accurate because I run a Batrium BMS and it uses a shunt too for SOC monitoring and both shunts agree.

I would not want a BMS to shut down all charging if there was a hardware fault, I would want the BMS to shut down that battery both charging and discharging. I've had critical faults occur with the Batrium and it will trip the shunt trip ABB breaker basically shutting down my whole system unless the charge controllers can supply enough PV power to the DC bus. That has it's risks though.

If you are gone for the day and had not remotely checked on the system, it sucks when you walk in the door and find the system shut down and batteries that won't power thru the night. In winter, a cold house and furnace not running. For that reason, I am adding another battery with a JK BMS so at least one battery or the other is online.

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Using BMS comm between battery and inverter vs. using shunt/SA seems to be a one-or-the-other debate. Do the two options have to be mutually exclusive? The great thing is that we have options to choose from to get the tradeoff we want for our use cases and priorities. BMS SOC isn't the most accurate, but depending on the use case, it could be good enough to be usable (for my use case, it has been good enough).

Letting BMS error shut down the inverter or not also has its pros and cons. If the BMS errors are nuisance errors, that's detrimental. But if a BMS error prevents a fire, that's valuable. With the case I mentioned by another poster being glad that his BMS error shut down the inverter, I think it was a case where the internal hardware protection was compromised, so other than telling the inverter to stop charging, the BMS in that situation might not have been able to properly shut down the battery.

For people who prioritize safety and redundancy really high (rather shut down if anything doesn't look right anywhere), couldn't both approaches be combined? I haven't given this "combo approach" detailed thought, but it seems it could work.

Zwy said:

SA and use a Smartshunt with it. You can check SOC, load, PV power and change inverter settings with SA from anywhere with web access.

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Yes to this. Need a shunt myself. The SOC reading is sometimes accurate with heavy useage on my solar hand cart, and other times WAY off due to such a small idle (30w) load or low end of day charging, that the bms is so far off, it can't be relied upon except as an individual cell voltage checking device and last ditch shut down device...which is annoying...but other than that open loop has been working great for me as well. I won't be changing this system, but any other system I build is going to use SA and it's accessories. Pretty awesome stuff, and nice to see it is compatible with SRNE and many others.

5mwh today. still 0 issues. inverter has just about paid for itself so far. @42OhmsPA is your asf retired? have any plans for it?

nickj said:

5mwh today. still 0 issues. inverter has just about paid for itself so far.

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Awesome, it's a great feeling isn't it...

nickj said:

@42OhmsPA is your asf retired? have any plans for it?

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It's retired for now. I have a few different ideas for it. Rapid battery charger if I find a nice diesel generator, additional MPPTs if I find a good spot for temporary winter ground mounts, mobile power plant if I come across a cheap enclosed trailer... Lots of ifs and possibilities...

42OhmsPA said:

It's retired for now.

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If you ever feel the need to rehome it let me know :D I should have bought two when I had the chance...

i also regret not having a spare. send it my way

Hello everyone; new to this forum. I have just purchased this SRNE inverter unit and can't seem to get a straight answer from SRNE on a question I have on the AC input side. My planned set up is a full off grid cabin with the AC output being split phase into a breaker load center panel. I have an inverter pure sine generator that outputs 240volts that I would like to connect on the AC input side as back up for cloudy days. The manual and SRNE are saying maximum AC input voltage is 140volts but how is this possible if it's a 4 wire AC input and would be 240volts if I was using the grid as input? Maybe they mean 140volts per leg? Or does the inverter transform the voltage to 120volts internally? Seems like my questions are being translated from English to Chinese on Aliexpress so maybe my questions are not being delivered properly to them but they are not answering this question for me. I apologize if this question has been answered in this thread; I scanned the 42 pages and did not see it but maybe I missed it... Thanks.

rivetc78 said:

Maybe they mean 140volts per leg?

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Correct.
I had no issues with my generator connected to the grid input ports. L1 L2, N and G wired appropriately.

rivetc78 said:

Seems like my questions are being translated from English to Chinese on Aliexpress so maybe my questions are not being delivered properly to them but they are not answering this question for me.

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Have you tried contacting them via email using the address in the support section on their website?


Welcome to the forum.

Thanks for the quick response and all the information you've provided in this thread! I am planning on sending a detailed email to SRNE directly but thought I'd try my question here as well. So your generator is putting out 240volts? Also, I see an icon for grid and an icon for generator on the panel; how would the inverter know the difference? Another weird thing is that my manual shows only 55 options in the settings menu but when I asked about neutral/ground bonding the seller on Aliexpress sent me a screen grab of a manual showing option 63 which addresses this. (I've also read the section on this thread about that topic). I haven't powered up my inverter yet so not sure if I have that option or not. Wonder if they made firmware updates to include this option and I have an "old version manual"?

rivetc78 said:

Thanks for the quick response and all the information you've provided in this thread! I am planning on sending a detailed email to SRNE directly but thought I'd try my question here as well. So your generator is putting out 240volts?

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Yes, 120V on L1 120V on L2 and 240V between L1 and L2.

rivetc78 said:

Also, I see an icon for grid and an icon for generator on the panel; how would the inverter know the difference?

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Not sure on that one.

rivetc78 said:

Another weird thing is that my manual shows only 55 options in the settings menu but when I asked about neutral/ground bonding the seller on Aliexpress sent me a screen grab of a manual showing option 63 which addresses this. (I've also read the section on this thread about that topic). I haven't powered up my inverter yet so not sure if I have that option or not. Wonder if they made firmware updates to include this option and I have an "old version manual"?

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I think the printed copy of the manual is older. I like the PDF version. You should have the option regardless of firmware updates.

42OhmsPA said:

Yes, 120V on L1 120V on L2 and 240V between L1 and L2.

Not sure on that one.

I think the printed copy of the manual is older. I like the PDF version. You should have the option regardless of firmware updates.

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Great, thanks again!

42OhmsPA said:

Not sure on that one.

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Has to do with the Dry Contact Port of the inverter.
When the inverter enables "remote generator start" then the generator icon will light up on the panel.

I have not tested this on my ASP (ASF should be the same) inverter yet, it's on my list of things yet to be done, hopefully within the next couple of weeks.

Badbyte said:

Has to do with the Dry Contact Port of the inverter.
When the inverter enables "remote generator start" then the generator icon will light up on the panel.

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Makes sense, thanks!