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Solar Assistant not switching to SUB at set battery SOC

T

Texican

Solar Enthusiast
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Feb 8, 2022
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I have a dual MPP LV6548 system with 6 eg4 batts, using Solar Assistant, and for the last 2 days it has failed to auto switch from SBU to SUB at the set parameter, which was 30 percent. I woke up both days to find the batts at about 18 pct
I updated to latest SA software and rebooted after the first night, but no fix, it happened again last night
I guess I will switch to using batt voltage until I figure out the problem, and hope it works
All other SA data is current and working
 
On your inverters, what do you have options 12/13 set to? They both need to be set low (for option 12) and high (for 13) so they don't interfere with SA. Otherwise your inverter and SA will end up "fighting" between each other because each one is switching without any knowledge of the other device and settings.
 
I had the switch to grid at 51v and the SOC point set at 35 pct
 
That value might be way to close. I had mine set to 48/55 so they would basically be the "safety net" in case SA never made the change for some reason.

Did SA show that you were in grid-mode on the dashboard? When the inverters hit the voltage set in option 12, the inverter remains in SBU mode but it "knows" it's supposed to be using the U (utility). Aside from looking at the display, you may never know you're actually in Utility mode of SBU. Solar assistant can't do that so it has to switch to SUB mode.
 
yes, the SA still showed SBU and was draining the batts. at 51.1v, I manually switched it to Utility First mode so the auto switch based on voltage never took place

I did not know that when it switches to utility mode it would still display SBU, thanks for the info
 
Just for kicks, I might try rebooting the pi. Then try resetting everything to the values you had and try and set the SOC switch to utility value to something close to where you're at right now. That way you can test the switch instead of waiting till the next time you get low.

I'm assuming this has worked for you in the past?
 
yes I will do some testing, first using voltage to make sure at least that works.
3 days ago it did work and made the switch at 35 pct
 
So this issue is still happening
today I had solar assistant set to go to SUB mode at 40 percent battery SOC, it did not switch, at 38 percent I did it manually.
my voltage settings are 51v to go to grid and 56v to go back to battery, so I dont think that is interfering

any ideas ?
my batteries are eg4 lifepower4 and all data is visible in solar assistant for all 6 batteries
 
@Skypower any ideas? Thought you had a few LV6548s and SA.

His SA is acting kinda odd to me. He could be in SUB mode but as soon as he turns on the "maintain battery SOC", the inverters switch to "Grid Mode (SBU)". His SOC is 97% and his maintain battery SOC values in SA are set to 40 and 50%.

I've never seen the "Grid Mode (SBU)" on the 6500s, so I wasn't sure if that was something specific to the LV6548.

The battery voltage is 53.x. We set his Switch to grid and back to battery voltages to 51 and 52v to make sure that the inverter wasn't forcing the switch to Utility.
 
I’d try restarting the inverters too. Of course when you restart the inverter may want to run a full charge which I’d let it do. I’m wondering in he has closed loop coms between the inverter and batteries. There isn’t a charge timer set in the the inverter, that would probably conflict with SA.
 
Skypower said:
I’d try restarting the inverters too. Of course when you restart the inverter may want to run a full charge which I’d let it do. I’m wondering in he has closed loop coms between the inverter and batteries. There isn’t a charge timer set in the the inverter, that would probably conflict with SA.
Click to expand...
We actually tried with the closed loop coms as well as the Victon smart shunt.
 
Important! Solar assistant will trigger the maintain state of charge in the master inverter. Check the serial number at the bottom of the inverter page from Home Screen. Verify that inverter #1 is indeed your master. If if not, click disconnect at the settings page, switch the USB’s around then click connect. Don’t forget to swear at it until it does what you want. More often than not after an update or reboot it’ll default to the wrong inverter.
 
Last edited:
Note on my battery settings it shows “Back to battery voltage 0.0V” because because in program 13 the entry is “Full”. SA has no provision for that, hence it shows 0.0V
It’s not a problem.
 
Texican said:
SA is directly plugged into both inverters each with its own cable
I think you have to do this to see both inverters in SA
Click to expand...
Yes you can see both, but SA instructs one inverter. If it’s talking to the wrong one nothing may happen.
 
Skypower said:
Yes you can see both, but SA instructs one inverter. If it’s talking to the wrong one nothing may happen.
Click to expand...
I had both connected and ultimately it was the flip of a coin as to which one was assigned as "Inverter 1". It actually changed between reboots. In talking to SA about it, at some point they're gonna add the ability to map which inverter is which, but there's no ETA. Since most of the settings sync (with a few exceptions), it shouldn't matter which inverter you're making the change on because they will propagate.
 
Adam De Lay said:
I had both connected and ultimately it was the flip of a coin as to which one was assigned as "Inverter 1". It actually changed between reboots. In talking to SA about it, at some point they're gonna add the ability to map which inverter is which, but there's no ETA. Since most of the settings sync (with a few exceptions), it shouldn't matter which inverter you're making the change on because they will propagate.
Click to expand...
Flip of the coin? I wasn’t that lucky.
It’s good SA is working on it. I’ve run into issues when it’s wrong.
 
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