My Growatt inverter seems to be underperforming when it comes to charging my lithium battery, as it's only providing a maximum of 2.7 kW from the grid. However, I noticed that by adjusting the inverter settings and switching the battery type to lead acid, the inverter is able to charge the battery at a higher rate, reaching up to 3.8 kW. I've already verified that the charging current setting is at 100%, yet the issue persists when using a lithium battery. Has anyone else encountered a similar problem and can offer assistance in resolving it? Your help would be greatly appreciated. Thank you!
Growatt inverter SPH 5000TL BL-UP charging battery issue.
- Thread starter Jbstudio
- Start date
Samsonite801
Solar Wizard
- Joined
- Oct 15, 2020
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- 2,997
Did you ever happen to try setting the battery type to custom user profile on the charge profile and plug in manual settings like here:
diysolarforum.com
or here:
diysolarforum.com
The thing I wonder about setting it to lithium, is if it is trying to charge using battery comms (via CANbus or RS485) cable and not getting good communication received, or something weird like that.
Settings to custom user profile will allow it to charge based on voltages, comms are not really needed anyways.
I am not a Growatt enthusiast so my answer may be somewhat generic as I am not as familiar with working on those models, but just thought I'd throw in my quick suggestion for something to check or try as a test to see if you can improve the charging rate.
How does it perform on solar charging? Or do you have any solar attached?
Recommended Charge Profile for DIY LiFePO4 Batteries *Sticky Post*
12V 4S LiFePO4 Battery w/ BMS: Absorption: 14.5V Float: 13.6V Inverter Cut-off: 10.7V-12V (depending on size of load and voltage drop etc) 24V 8S LiFePO4 Battery w/ BMS Absorption: 29V Float: 27.2V Inverter Cut-off: 21.4V-24V 48V 16S LiFePO4 Battery w/ BMS Absorption: 58V Float: 54.4V...
diysolarforum.com
or here:
Best LifePo4 charge controller settings known to man for Maximum Service life and Minimum battery stress!!! 5,000-10,000+ cycles?
---ORIGINAL TITLE---- Best charge controller settings to achieve 10%-90% usage on lifepo4 ? EDIT-UPDATE and the ANSWER to this question. . . This post is a accumulation of all the great and wonderful information given to me by all the great people on this thread. I consolidated all of this...
diysolarforum.com
The thing I wonder about setting it to lithium, is if it is trying to charge using battery comms (via CANbus or RS485) cable and not getting good communication received, or something weird like that.
Settings to custom user profile will allow it to charge based on voltages, comms are not really needed anyways.
I am not a Growatt enthusiast so my answer may be somewhat generic as I am not as familiar with working on those models, but just thought I'd throw in my quick suggestion for something to check or try as a test to see if you can improve the charging rate.
How does it perform on solar charging? Or do you have any solar attached?
WOLF-GANG
New Member
Could you do me a favor and let me know 2 registers of your inverter if you still use that SPH 5000?
I am looking for the values of register 29 and 121
Those are the limiting factors which limit the output (not the charging). SPH 4600 and 5000 single phase are able to generate the 6000 Watt just by tweaking them.
Thanks a lot
Sidewaysmike
New Member
Hi Wolf Gang can you tell me what these settings are and how to change them. I have a sph5000tl bl-up and would like to maximize its output if possible. Currently inverter clips at 5.1kw with full battery and only charges and discharges at 3kw the data sheet for this model says discharge and charge at 4kw
WOLF-GANG
New Member
Please let me know the register values of 29 and 121 first cause I have to give those to a buddy who is doing all the further investigations.
Just to make sure: You have the single phase SPH5000 and the BL-UP version which means low voltage battery and backup function integrated.
I guess, you must have installed more than 5 kWp if the system is clipping and cutting off the top edge we even rarely have here.
Regarding charging speeds you are right and wrong cause it is iright that the charging speed is advertised with 4 kW but they also mention usually somewhere in the footnote that this charging speed is depending on temperature and SOC . The hotter the battery or BMS the lower the charging speeed, the fuller the battery gets the lower the charging performance.
Finally: it also depends on the battery size in my experience cause I have a JK BMS and fooled the inverter by telling it of a charging speed of 300A and 360 Ah capacity. And then the charging speed increased significantly compared to the 75 A I had used before.
75 A is enough for a SPH 4600 or SPH 5000 but the charging speed will be lot lower.
Not sure what BMS you have but be aware of all the impacts of these parameters.
I had to cause SPH does not allow to discharge the battery to 0% and forces you to to stop discharging at 10%. So my 280 Ah EVE LFP battery had to increase in the settings to 311 Ah simply to be able to use 280 Ah out that. And during these experiments I had found out that the charging speed also had increased and same for the max. current . Of cause it sounds and feels weird that the inverter can only charge with 66A but will only fully perform if you fool that with a 200A or 300A BMS current that the inverter never can use.
Please let me know the registers mentioned before and then I will give those to my buddy who will cross check how to improve the performance but mainly on the AC side.
If you really need a faster charging you will need a separate charger which we will do later too cause we have 25 kWp that are powering mainly MiN 4600 inverters and that way around we would be able to use the surplus power generated by these inverters to charge the battery with up to 200A in total as the BMS can handle that too. The charger is about 200€ in total. We do need that to charge the battery from cheap off peak tarif hours during night which means a 2 hours opportunity if there are strong winds in the north sea and the wind turbine farms are performing well. 2 hours and 6000 W charging speed is our goal to charge 12 kWh into the empty battery which we need for the heatpump during wintertime.
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