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PatrikTrestik / homeassistant-solax-http

Home assistant integration for SolaX EV Charger HTTP API
Apache License 2.0
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Parameter writings / EEPROM access / MaxChargeCurrent #19

Closed beaune33 closed 7 months ago

beaune33 commented 7 months ago

I am wondering if we have any information, which parameters are stored in an EEPROM and how often they may be written. For the inverter we have the well-known document, where parameters are marked with a star, if they are stored in the EEPROM, and therefore should not be written to often. Are there any comparable information for the EVC?

In my concrete case I am thinking about changing MaxChargeCurrent (Modbus 0x628) in Fast Charging mode dynamically, depending on the energy available. Unfortunately my car starts charging not beyond 8A, so I cannot use green mode and have to program something similar on my own. So, I could start with 8A in the morning when sun is low, if sun increases and more power is available, I could dynamically switch to 9/10A etc, and if sun is going down in the same way. The only thing is, I am afraid that this value could be written too often and therefore the life time of the EEPROM could decrease. But the question is, if MaxChargeCurrent is stored in EPROM at all, or if this is a volatile setting. Do you have any information about this?

Philipp-X1 commented 7 months ago

May I ask how you are going to realise the dynamic charging? All programming by hand? Do you know about EVCC? It could do the job perfectly and is already here. So we would not need to reinvent the wheel.

At the moment I am trying to set up a custom charger at EVCC but I am struggling with the Modbus settings… Is there anybody here interested in Setting up EVCC and would want to help? (Of course EVCC could be Setup with HTTP as well)

beaune33 commented 7 months ago

Everything by hand, yes. I have all necessary information in my local network accessible by home automation, inverter, evc, access to car via OBD interface,… so it is easy to program the rest in fhem without other external software. I am not sure how evcc could help or make things more easy. At the end the question is the same: the charging energy needs to be adjusted, so I need to communicate to the evc. The way to do seems to be the parameter mentioned above. I know it works, the only thing I am asking myself is if I have to be careful because of eeprom writing cycles. Maybe not, but I am not sure.

Philipp-X1 commented 7 months ago

Well at least I was reading somewhere that the Inverter ( Solax X3 Hybrid ) has 1.000.000 eeprom writing cycles. I don’t know how it is realized with the EV Charger.

EVCC has a good UI and can do quite more than the integrated smart function from Solax.

I got all the information in my Network aswell and I also changed the charge rate already. But I can’t write the software :)

PatrikTrestik commented 7 months ago

EVC Modbus document I have does not show any information about EPROM written registers. But there is same disclaimer as in inverter document so I expect that some exist. Better to ask Solax support. 1M writes is standard EEPROM cycle limit.

PatrikTrestik commented 7 months ago

I am wondering if we have any information, which parameters are stored in an EEPROM and how often they may be written. For the inverter we have the well-known document, where parameters are marked with a star, if they are stored in the EEPROM, and therefore should not be written to often. Are there any comparable information for the EVC?

In my concrete case I am thinking about changing MaxChargeCurrent (Modbus 0x628) in Fast Charging mode dynamically, depending on the energy available. Unfortunately my car starts charging not beyond 8A, so I cannot use green mode and have to program something similar on my own. So, I could start with 8A in the morning when sun is low, if sun increases and more power is available, I could dynamically switch to 9/10A etc, and if sun is going down in the same way. The only thing is, I am afraid that this value could be written too often and therefore the life time of the EEPROM could decrease. But the question is, if MaxChargeCurrent is stored in EPROM at all, or if this is a volatile setting. Do you have any information about this?

Your idea is probably better solvable with simulating Green function of SolaX inverter. It periodically (3s) writes "Available PV power" to EVC if connected. See here: https://github.com/wills106/homeassistant-solax-modbus/discussions/666

beaune33 commented 7 months ago

Interesting idea... but I am not completely sure how it could work. My problem is: my car needs at least 8A for charging. For green mode I can only configure 3 or 6A, so this does not work at all. For ECO mode I can configure 6 or 10A. 6A would also do nothing, so I only have 10A. But for normal sunny days this is too much. I would need a green or ECO mode for 8A, that would be ideal.

Because both modes do not offer 8A, I have to go to Fast mode. There I can configure the max. current to 8A.

What could be achieved by writing "Available PV power" to EVC? Of course, I could cut the direct modbus connection and send the value by my home automation. Or just cyclically overwrite them. But would this really help? I would still need fast mode I guess. Maybe I did not get your idea correctly.

Regarding the EVC Modbus document you mentioned above: Is this available somewhere? Could you share it? Till now I have all information from your source code only.