I have a 24V Growatt SPF 3000TL LVM All in one and overall it has been working fine. I am using 8 Lishen 200ah cells and a JK BMS. Everything works but one annoying thing I cannot get the system to stop doing is use solar instead of the battery. It will get 90% +/- charged maybe even 100 % +/- and it will stop using solar power and start draining the battery. It will then drain on the battery for a long time running the battery down 30% +/- ( do not have a logger on the system so I cannot give you exact details) It's draining the battery even though I have plenty of solar available. I'm connected to 2000 watts of PV panels wired 3S3P. If I reset the system it will start using solar again. I have parameter 01 set to SOL and parameter 05 set to US2 . My BMS is not connected to the Growatt AIO. Any ideas on the magic setting.
24V Growatt SPF 3000TL LVM stops using solar even when solar is available
- Thread starter kdiver58
- Start date
sparrowhawk
Christian Prepper
Try changing to the USE setting rather than USE2. There have been a lot of issues with the USE2 setting. I bought my spf 3000tl lvm over 2 years ago and although not a perfect inverter it has been adequate.
My relevant settings:
01. SBU
05. USE
12. 25v
13. 27v
14. CSO
19. 27.4v
20. 27.2v
22. SBE
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sparrowhawk
Christian Prepper
Let me know if those settings help.
BromhofBlonde
New Member
Hi Sparrowhawk,
Could you please explain why you use 37V for setting 13?
It's a lot higher than recommendations I have found (mostly around the 27V mark)
It is my understanding that this is the voltage at which the system will stop using Utility Supply to switch back to using the battery.
But if the battery is only 24V, it will never reach that level - so in effect, you're preventing the use of the battery as a source.
Is that the point?
Please note that I am very new to DIY Solar, so I might very well be completely off the mark - feel free to correct me!
Thank You
Rednecktek
Solar Wizard
I suspect fat fingers are why 37v. 
sparrowhawk
Christian Prepper
I suspect fat fingers are why 37v.
You suspect correctly. It should have read 27V.
Fixed it.
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BromhofBlonde
New Member
Haha, I wasn't about to suggest something like that and get myself kicked out the gang on my first day.
Thanks sparrowhawk, for the advice on the settings - Madame Growatt has definitely been behaving better since I loaded them.
Not sure if you guys know about South Africa and our Loadshedding? We have been in Stage 6 this past week, which means we cycle on and off in 2-4h blocks for a (minimum) total of 12h in every 24h. At least one of those blocks gets extended when they can't turn us back on without their system tripping on overload. That can then take anything from 2h to 2 weeks to sort out. It's *great* fun, as you can imagine. This solar setup is in our guardhouse and it powers our entire security system. Crime is rife during loadshedding, because the crooks know full well that alarms and electric fences probably don't work. And that's why I need the system running optimally.
I have more questions on BMS and ways to optimise battery use / lifespan. I still need to do a search to see if someone has already posted the same or similar questions. If not, I'm coming back here to find you
sparrowhawk
Christian Prepper
Haha, I wasn't about to suggest something like that and get myself kicked out the gang on my first day.
Thanks sparrowhawk, for the advice on the settings - Madame Growatt has definitely been behaving better since I loaded them.
Not sure if you guys know about South Africa and our Loadshedding? We have been in Stage 6 this past week, which means we cycle on and off in 2-4h blocks for a (minimum) total of 12h in every 24h. At least one of those blocks gets extended when they can't turn us back on without their system tripping on overload. That can then take anything from 2h to 2 weeks to sort out. It's *great* fun, as you can imagine. This solar setup is in our guardhouse and it powers our entire security system. Crime is rife during loadshedding, because the crooks know full well that alarms and electric fences probably don't work. And that's why I need the system running optimally.
I have more questions on BMS and ways to optimise battery use / lifespan. I still need to do a search to see if someone has already posted the same or similar questions. If not, I'm coming back here to find you
The original intent of my system was to keep the lights, refrigerator and a window A/C operating during the frequent power outages we have in this part of South Carolina.
On a more disturbing note a few years ago I remember reading a few stories about some of the farmers in South Africa being murdered and there properties being taken over and the government not doing anything about it and may have actually been encouraging it.
BromhofBlonde
New Member
When you say frequent, how often do you mean? And the cause? I'm asking because I guess we all assume that the USA wouldn't be subject to outages other than occasionally as a result of severe weather. The grass is always greener, I guess?
Yes, we do have some issues here. Farm murders are often not properly investigated because they are in outlying areas with small police forces that are spread thin. There is a lot of corruption and mismanagement within the government which is why we have all this loadshedding; but we also have amazing people who regularly pull together and help each other out. We are nothing if not resilient - we have ridiculous amounts of sunshine (probably 360 days of the year) and our residential / private / small business solar PV capacity increased from 983MW in March 2022 to 4,412MW in June 2023. We all live in the hope that things will get better, if we just hang in there long enough.
