sjp

It is actually not that bad if you think about it. 10% of the 20% that you should not use daily (80% DoD) is now between 100% and 90%, which is actually good for the longevity(lithium based batteries do not like sitting at 100%) as long as the "micro cycles" aren't too excessive.

It depends for me. When there is grid power, it will handle the load with solar and slowly 'decay" to 90% When there is no grid power, then everything comes from the battery and nothing from solar. It will cycle between 100% and 90 much faster. (Which I don't like at all)

Guys, I also have a Deye 8k and 3x CFE 5100s. This behaviour is coming from the BMS of the battery and not the inverter. The inverter is doing what it is told by the BMS. When the SOC reach 100%, you can see the BMS change the (highlighted) charge current to 0A. Once the SOC falls below 90%, it goes back to whatever your stack can handle. I guess they feel it is better for their battery to cycle than to sit at 100% all day long. (It bothered me a lot at first, but I made my peace with it)

Just a wild guess: Is your CT coil maybe installed backwards ? Maybe you can get ideas from watching this:

It is dependant on how deep you discharge. The 6000 cycles that they state are usually for 80% DoD. Say 1 loadshed session of 2 hours uses 20% of your battery capacity, then 3 of those will be 60% So basically you would have used up 60/80 (0.75) of a "rated cycle" It does not matter if you use 20% and charge up or 60% and then charge up, they count as the same as far as the chemistry goes. The counters of the BMS may have their own idea of cycles( each BMS brand has its own idea in any case), but as far as the chemistry goes, you should be fine.

For comparison, I do not have a battery cable and this is all I can see:

Hi Patrick Just out of interest: What is the battery temperature you are seeing ?

Hi Mzez I was basically looking for the Zigbee version of these: (I don't care about the energy metering part of these) https://www.takealot.com/smart-wifi-power-plug-switch-for-south-african-2-3-pin/PLID63166267 https://www.takealot.com/sonoff-th-origin-20a-with-waterproof-temperature-sensor/PLID91375033 https://www.takealot.com/smart-wifi-geyser-timer-with-energy-metering-smart-life-tuya-app/PLID91403075 https://www.takealot.com/tuya-wi-fi-smart-timer-switch-16a-circuit-breaker-din-rail-1p-ap/PLID92495523 Oh, so you can communicate with Sonoff and Tuya devices without the internet. What do you need in order for the "sonoff lan" and localTuya respectively to work ? Some gateway device(s) or just certain HA plugins ? Also, can you have a mix of Sonoff and Tuya devices ? Or is it advisable to stick to one brand ?

Hi all I also want to start doing some home automation, but it seems very difficult to find devices that are not cloud based (all wifi devices ?) From what I read, one should buy either Zigbee or Z-wave devices and let them communicate directly to a dongle in the home assistant RPI. The availability of Zigbee or Z-wave devices seems very limited.

Hi Deon, I have a 8k Deye inverter with 3x 5.1kWh CFE batteries and 6kWp PV, that was installed mid December. With no grid power, I see the batteries being charge up to 100% and then basically no solar energy being used after they hit 100% until SoC falls below 90%, at which point it starts charging back up to 100% while also supplying energy to the load. It will cycle like that while there are solar power, just like you said. With grid power available, it actually does the same, except that the load will be fed from the solar power, so the battery discharges much slower and might seem not to drain the battery. (The off-grid case actually needed solar power on the load more than the on-grid case ...) As far as I can tell, it is caused by the BMS of the CFE batteries. Basically trying to get away from sitting at 100% SoC the whole day. In theory that should improve the longevity of the batteries over the long run. The question now is why CFE feels the need to do that while other battery manufacturers don't... This brings me to the total lack of control the (8k?) Deye inverter has over solar charging. If there are settings I missed, I will be very grateful to be enlightened The 8k Deye basically always charge the batteries to 100% SoC, all the time (solar > load). You can change "time of use" or any other settings as much as you like, you will not be able to stop it from doing that (bar unplugging the solar panels). This was probably a good strategy back in the lead-acid days, but lithium batteries need more control, as they actually do not like sitting at 100% the whole day. What I would like to do is to charge the batteries up to 100% early in the morning (The BMS needs this to calibrate the SoC and balance the cells) Then I would like to be able to let it use only battery power untill SoC reaches 75%, at which point it should feed solar power to the load and charge the battery when it falls below 75%. This can't be done with a Deye as far as I know. I would be interested to hear if other inverters can do this, or indeed if I am (hopefully) missing something. I can achieve what I just described when I disconnect the solar panels and only use grid charge, but the moment I connect the solar, it ignores all settings and cook the batteries all the way up to 100% ... My load is about 300W, so solar > load almost always. I probably stand alone in wanting to maximize the longevity of my batteries instead of maximizing the energy they store.