Could you please point me to where this is documented ? As it goes against every thing I have read, a float of 54 = 3.4v per cell, where 56 = 3.5v and is considered an 80% charge
Could you tell me which battery/cell manufacture put this out ?
This follows what my manufacture says,I have found 3 different voltage sets for various cells. 3 to 3.6, 3 to 3.65, 3.2 to 3.65, it would also seem to age the cells as well. Your Chins cells are the newer 3.2 to 3.65 cells 3.2 x 16 = 51.2, mine are the older 3 to 3.6 cells
That would be good to know, Some say they will break apart before the capacity is diminish, I've had some LiOn batteries for about 6 years and slowly but surely their capacity has diminish but they still run my lights and small appliances just fine during emergency situations for days at a time, so I'm keeping them for now. As technology advance I'm pretty sure the capacity and capabilities of the "future" batteries will get better, hopefully to the point were EVs can go from West to East coast (USA) in one charge during a piss stop at the local market and the EV will pay and keep you informed, just stop the car on top of the designated charging area and go take a piss, when you come back the car is fully charged and ready to go!
This is exactly what happens with mine, once the batteries are full while on PV priority and PV energy available it starts drawing from the batteries. I'm not sure if this is by design or if there is a glitch in the firmware. We will see.
I don't have that much room to put more panels up and 1Kw of PV is working for me specially in good sunny days, but in TX gets hot so panel output is reduced then clouds, rain, storms, bird poop, you name it is takes away, so I need all I can get.
Sorry, this table is generic for LiFePO4 batteries. As it is the battery chemistry that sets the voltage curve this should be applicable to most manufactures with slight variation.
diysolarforum.com
Maybe you hit the nail in the head, I'm new to Growatt, I have the 3k 48v, and I set it up according to the manufactures specs, and they are similar, I think they come out the same door where they make them put a different decal and colors and out they go. But anyways, there is a setting let me check the manual, it allows the MPPT to adjust the output according to the load and that might be the answer to this issue where the MPPT shuts down and batteries starts supplying the loads even while on PV only priority! OK the setting is 22 on the Growatt 3k 48v unit, (solar power balance), I have that disabled but default is enabled, I'm going to change that back to default and see how it reacts. Hopefully they behavior will change for better. This is an update, after setting back to the default on 22, the Growatt still doing the same thing. if someone could shine some light on the following i would appreciated. I'm thinking that you have to have a high enough load for the MPPT to continue working, if that load is not high enough it will shut down, and the batteries will maintain the unit since is the only option that will provide the power necessary to maintain normal operation, the Growatt consumes between 40-65 watts on stand by mode which is not enough to keep the MPPT on, and it will shut down because there is no load high enough to operate. Maybe?
Same here, I'm still trying other things, but might end up changing the USE2 to USE mode and hopefully get this issue solved.
I feel the same way. The only thing we can do to escape that feeling is do extensive research. Love it. Know it.
I'm not an expert on the Growatt yet! But in trying to understand better, do you have the WIFI dongle? Do you have access to the data chart on battery consumption? I think that would be a good start. About your question on the LAN cable, I would think that it would be the best thing to do, disconnect the communications cable so that you might be able to change the settings, otherwise the battery will retain it's default settings, it is my understanding that these batteries come with a default preset and so is the Growatt unit, their firmware dictates what settings you can change or not. I have the Growatt 3kw unit 48v and there are settings that can not be change depending on your selected options. In my case while using the US2 mode option 5, (since I use standard 100ah LiPo4 batteries) as you can see in the picture attached to this post, if I try to change the float to other than the max charging voltage it will default back to max charging voltage and it won't allow any difference on those 2 numbers. I'm pretty sure Growatt knows a lot of users are not too happy about this but it is what it is and I'm sure they got strong reason(s) for this. Hopefully they will find a better solution to this sooner than later. Please as I said is hard to visualize your situation just by reading text and please understand that any changes made by you are of your choice. Hope that helps.
Unfortunately I do not have the Wi-Fi dongle. I use PV keeper 2 to set the settings.
OK, the WIFI dongle helps but is not necessary unless you can't see the little letters and numbers on the unit's screen, but it does offer a more simplified solution in my case. I took a peak at the batteries, do they have 2 different capacities on these batteries? Says that they have an MPPT controller built in! Having 2 MPPT controllers should not be a problem, a true MPPT controller will do a good job at sharing the input voltage (with another MPPT controller) from the different energy source(s), these could be a battery or solar panels, turbine etc... Everything point to the settings either on the Growatt or the battery of both. The program you use, is that data from the battery's BMS, how are you connecting to communicate, hardwired, Bluetooth? Just as a side note, I have never seen my batteries go all the way up to 56.8v either specially when the manufacturer says the over voltage protection kicks in at around 56.4v, the highest I have seen it is around 55.4v (while charging) once they are at 100% supposedly, and the charger stops, they come back down to around 54.4v and rest there. Let's kick this around some more and see if someone else might have ideas on how to solve this. Cheers!
