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diy solar

diy solar

SRNE 12kW IP65 HES and 10kW ASP

Nice will be hooking up two of these in parallel pretty soon
exciting times ahead !
hope you post some updates after you get your new equipment installed!

{and for the record: it's all @42OhmsPA 's fault for getting the SRNE bug, and then spreading it to the rest of us ! :ROFLMAO: }
 
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Anyone seeing this sort of charge cycling near 100% SOC on the HESP? Seems to ramp up for some amount of time, then suddenly switch to discharge mode, and then the cycle repeats. Seems to do it on both grid or solar charge, cycling gets more frequent the more fully charged the battery is. Doesn't seem to be influenced by whether using BMS communication or running open loop or the actual set battery charge voltage though. It doesn't appear to be a data acquisition issue as I can see the same cycling on the inverters UI with the charge state toggling between quick charge, constant voltage charge, and charge off. It's making it hard for my battery to successfully balance since the voltage keeps dropping below the threshold every time it drops back into discharge mode. It isn't the BMS(s) as far as I can tell, they keep both charge and discharge enabled mode continually and not seeing any cells get high enough to trigger over voltage protection.

(Note the drop in SOC is from me disabling BMS communication and raising the charge limit settings in the inverter, otherwise would have stayed at 98% like it did for the first 35 minutes shown. Also note that negative current in this case is charging)

1738968216862.png
Previous hour (not as close to full so less frequent cycling):
1738968803135.png
 
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That is odd. Can you share your open loop charging settings?
I'm not familiar with the HESP, I'm sure others will have some good advice.
 
That is odd. Can you share your open loop charging settings?
I'm not familiar with the HESP, I'm sure others will have some good advice.
I normally run closed loop with the maximum charge voltage at 55.2 through my BMS (actually I use YamBMS to combine multiple JK-BMS with more configurability than the default JK parallel implementation, but I get the same behavior direct from one or both BMS as well,) but this is what I tried last when running open loop and it didn't really change anything. As far as I can tell the only configurable parameters that would possibly cause that behavior would be the maximum charge voltage or the battery stop discharge current, but it wasn't reaching either of those, charging voltage was consistently below the setpoint, and charging current was consistently above the setpoint, at least from what I could see on the inverter display and/or reading data from it over RS485. Soon after I collected that data I ran one of the batteries isolated with a bench supply charging it for a bit so that I could try to get some actual balancing in, and it showed stable voltage/current unlike what I was seeing with the inverter charging, so it wasn't the BMS cutting out.
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1738976147202.jpeg
 
Looking at the graph closer it looks like it hits the recharge voltage and cycles again and again. Like you asked what's causing it to read "full"?
Have you metered voltage at the inverter terminals and the battery terminals? I'm wondering if that's what could be causing it.

Can you try bumping recharge voltage up a bit to see if it behaves differently?
I wish there was a timer setting for holding at " full" voltage for xx amount of time.
 
Anyone seeing this sort of charge cycling near 100% SOC on the HESP? Seems to ramp up for some amount of time, then suddenly switch to discharge mode, and then the cycle repeats.

I have AOlithium 51.2V 100ah batteries running in closed loop with the SRNE ASF-series inverter, and I see similar behaviour.

When the batteries get full, the BMS sends a '0 amp charge limit' signal to the inverter to stop the charge. A few moments later (a minute or two, perhaps), the BMS sends a '5 amp charge limit' signal to the inverter and the charge ramps up to 5A. Another minute or two and the cycle repeats. It seems as though the BMS can't/won't send a charge limit signal of less than 5 amps, so the result is a constant 5A / 0A cycling.

If I run open loop, I don't see that same behaviour.

Chris
 
Looking at the graph closer it looks like it hits the recharge voltage and cycles again and again. Like you asked what's causing it to read "full"?
Have you metered voltage at the inverter terminals and the battery terminals? I'm wondering if that's what could be causing it.

Can you try bumping recharge voltage up a bit to see if it behaves differently?
I wish there was a timer setting for holding at " full" voltage for xx amount of time.
That's what I thought might be happening, but it was only getting to 55.0 when it was set to 55.2, and when I bumped it up to 55.6 then 56.6 it was still showing the same behavior and bouncing off of 55.0V, you can see that in my first plot. Reported inverter battery voltage seem to sit about 0.05-0.15V higher than measured at the cells (depending on current,) and what the BMS reports. I didn't get a measurement actually at the inverter terminals while charging, so that might be something to check when I do my next charge to 100%.While discharging at about 37a on the pack right now I'm measuring I see 52.05 at the inverter terminals, it reports 52.0V, the pack terminals show 52.13, the BMS reports 52.14 and the cell terminals show 52.15V. They all should be closer near the end of a charge when less than 10A is flowing though.

I do kind of wonder if maybe some value is getting stuck in the inverter charging logic, it does seem consistent it never goes higher than 55.0 for any sustained period, just don't know why raising the limit while open loop didn't move things.
1000004650.jpg


I have AOlithium 51.2V 100ah batteries running in closed loop with the SRNE ASF-series inverter, and I see similar behaviour.

When the batteries get full, the BMS sends a '0 amp charge limit' signal to the inverter to stop the charge. A few moments later (a minute or two, perhaps), the BMS sends a '5 amp charge limit' signal to the inverter and the charge ramps up to 5A. Another minute or two and the cycle repeats. It seems as though the BMS can't/won't send a charge limit signal of less than 5 amps, so the result is a constant 5A / 0A cycling.

If I run open loop, I don't see that same behaviour.

Chris
Yeah, I thought it might be something with the BMS, but it was still doing it running open loop (was in open loop when charging current limit is flat from 3:35 on in the following plot.) Also, when I was seeing it closed loop both YamBMS and the inverter was still showing a requested charge current of well over 100A even when the discharges started.

1000004649.jpg
Though now that I think about it, I did just disable battery communication in the inverter settings, I didn't actually pull the cable, so it's possible maybe the setting wasn't being respected and it was still running closed loop. Will try pulling the cable during the next 100% charge to see if it changes anything.
 
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Currently running the same inverters as @Zwy and interested in a user comparison between the two once you get the SRNEs up and running.
Preliminary results of SPI-10K-UP vs. MPP LV6548s with fewer than 24 hrs. operation:

[ranking in brackets]

Pro:
  • fans are quieter [small]
  • LED lights throbbing/flickering seems to be gone [big]
Con:
  • terminal access - Very cramped as others have mentioned. [medium]
  • display goes to sleep with inactivity - If there's an "Always ON" setting I haven't been able to find it. [medium]
  • Why does the UP arrow button move the screen number icon DOWN?! :ROFLMAO: [small]
  • I'd like for the beep on button press to be OFF too. [small]
Question:
I'm confused about the PV input specs. for the MPPTs.

Maximum input power11,000W
Maximum input current22/22A

Does this mean that it's 11kW per MPPT or 11kW total? It seems like total, but then only one MPPT could be at 22A. :unsure:
 
You can set the display to be "always on" - but this is not recommended.
I set mine to remain on a few minutes instead of the short default time while I was getting used to the new inverters.
You can turn off the beep in the settings as well.
- if you can't find where to make these adjustments in the settings, bump this post and I will get some screen shots for you.
 
11KW total. 5500W, 22A per MPPT.

Haha it took me a minute or two to get used to the buttons.
That might work for over-paneling with SE and SW arrays.
You can set the display to be "always on" - but this is not recommended.
I set mine to remain on a few minutes instead of the short default time while I was getting used to the new inverters.
You can turn off the beep in the settings as well.
- if you can't find where to make these adjustments in the settings, bump this post and I will get some screen shots for you.
A parameter number should be sufficient. If it's there though I'm not seeing it.
 
I'd look at your batteries to see how well balanced the cells are. It could be the BMS is shutting down charge due to OVP.
The cells aren't amazingly balanced, mostly due to this behavior cutting off the balancing cycles, but I also wasn't seeing any hit or really come near the OVP threshold. Charging off a bench supply at the same voltage showed a nice continuous current plot, though admittedly the available current it could supply was much lower so they runner cells wouldn't run as much.

I didn't try pulling the cable to disable comms yet since It actually looked better today after I raised the charge voltage threshold in my BMS settings to 55.5V. It still cycles, but the voltage isn't dropping enough when it does to interrupt the balancing this time. It does look more and more like when the inverter reaches the bulk voltage it immediately drops by some amount then cycles back and forth, and it doesn't always respect the exact voltage set, seems to usually be 100-200mV lower.
1000004655.jpg
 
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A parameter number should be sufficient. If it's there though I'm not seeing it.
Screen always on
Beeping every time you touch a button

Go to the Basic Settings,
on the left side you will see a check-box for keeping the screen illuminated all the time "Screen always on" - if not always on you can set how many seconds before the screen auto-darkens. Then click "Ok" at the top far right.
Also on the basic set up screen, but on the right side - there is a check box called "Beep" the default is checked, un-check this and press "OK" ie Save, no more beep.
IMG_6480.jpg
 
Screen always on
Beeping every time you touch a button

Go to the Basic Settings,
on the left side you will see a check-box for keeping the screen illuminated all the time "Screen always on" - if not always on you can set how many seconds before the screen auto-darkens. Then click "Ok" at the top far right.
Also on the basic set up screen, but on the right side - there is a check box called "Beep" the default is checked, un-check this and press "OK" ie Save, no more beep.
Thanks, but I'm guessing that's the HESP because that menu looks completely different than the SPI-10K-UP/SRNE ASP48100U200-H that I have.
 
The strange end of charge behavior on this inverter continues. Today after cycling for a bit (but staying generally at a high enough voltage balancing shouldn't have been interrupted,) the inverter randomly shot the charge voltage all the way up to 59.3V, well above any setpoint programmed into either the inverter or the BMS. Not long after it ramped back down to around 54V (while both BMS were in OVP, so weren't going to charge anyway.) Looks like maybe it was trying to do a lead-acid equalization charge even though the inverter (and BMS) are both set to LiFePO4? The UI doesn't expose any equalization settings when set to LFP mode, I'll see if I can read them with RS-485 and see what they are set to.
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1739232868190.jpeg
 
I do not know your system, something I learned after 3+ years with Growatt AiO, I stopped using BMS closed circuit with the AiO, went to BMS to the SA (solar assistant), changed the AiO to US2 Lithium no BMS and closed circuit of the AiO to SA. it stopped all the fighting between the AiO and BMS batteries.. letting SA be the man in the middle (hub) so to speak. Everyone is happy including myself.. I see better management and control of the batteries and operation of the AiO..
Now it may not be for you.. but just wanted to share something, you may consider.. wish you the best.
 
The strange end of charge behavior on this inverter continues. Today after cycling for a bit (but staying generally at a high enough voltage balancing shouldn't have been interrupted,) the inverter randomly shot the charge voltage all the way up to 59.3V, well above any setpoint programmed into either the inverter or the BMS. Not long after it ramped back down to around 54V (while both BMS were in OVP, so weren't going to charge anyway.) Looks like maybe it was trying to do a lead-acid equalization charge even though the inverter (and BMS) are both set to LiFePO4? The UI doesn't expose any equalization settings when set to LFP mode, I'll see if I can read them with RS-485 and see what they are set to.
View attachment 277239

View attachment 277240
Did you try it in Inverter Logic with the BMS set to Disable to see how it performed with some sun in that case?
 

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