@jancold 

Looking at your stats I'd be inclined to drop your charge rate to around 100A as it's at 100% full quite early In your off peak window.

It'll reduce the charge load on the inverter and batteries.

@bash Thanks I completely agree and had  already reduced it to 130A to reduce stress and I now have further reduced to 110A. As I say I am not completely happy I have all the best settings.

@jancold 

The good thing is there isn't too many settings to worry about, I have the AC Coupled version of this inverter.

I didn't need to tweak mine much, the main one was the charge/discharge rates and timers.

The batteries BMS's were a different matter though!

There is a setting to allow the inverter to discharge upto 110% of the rated power, which was a bonus, as it gives a bit more headroom if the house demand is high.

Posted by: @jancold

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I get around this by plugging in the car but not unlocking the Zappi till late evening.

I leave the zappi in eco+ so it doesn't allow the car to charge and have a boost timer set from 23.30 to 5.30 and the ready by time on Octopus set for 5.30. This means I can unlock the zappi when I plug in and don't have to go back outside again without octopus starting a charge and draining the battery.

I haven't had the battery and inverter long so don't know if Octopus will consider this OK or not but the car car is still charging when Octopus tell it too as long as it is within the normal window.  I did email them to ask a way round the battery discharging to the car as the Octopus website suggested I switch to Intelligent Go. The suggestion was to set up Home Assistant, not something I want to spend time exploring at the moment, or move the CT clamps for the inverter so it can't read the zappi charging, something that's not possible to do with my complex wiring set-up.

Posted by: @johnnyb

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...

I did email them to ask a way round the battery discharging to the car as the Octopus website suggested I switch to Intelligent Go. The suggestion was to set up Home Assistant, not something I want to spend time exploring at the moment, or move the CT clamps for the inverter so it can't read the zappi charging, something that's not possible to do with my complex wiring set-up.

We are using Intelligent Go for import. Octopus connect to the BMW, it really does not bother us. When I wanted to charge the car during the day, I realised that the car charging is now controlled both via the Octopus app and the Ev charger one. And as @bash mentioned, the utilities expect the EV overnight tariffs to be used beyond the EV and some even make them available to people without an EV. There´s probably plenty of windpower that can be routed overnight.. 

The simple flat overnight rate made it very simple, we just need to make sure we avoid the 3* day rate. My plan is to eventually use things like Solis AI or HA batpred to maximise use of any Agile rate. Let the systems keep track of all the details and optimise import and export!  

HA can become time consuming to manage, depending on how much you try to keep connected to it. 

Some folk here run simple python scripts for various purposes. 

On a similar wavelength, I recently came across an app someone wrote and shared via github to control the Solis, when using Octopus Agile rates. 

https://github.com/Webreaper/SolisAgileManager

Posted by: @bash

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@batpred 

Thanks.

My firmware is the same as yours.

I too have no idea why the Wifi connection won't work with the password.

I came across this info about the datalogger firmware from a github repository (that describes how to install ESPHome firmware on the Solis S3 stick) that may help...

The web interface is protected by HTTP simple auth with fixed username admin and password 123456789. After connecting the stick to your home WiFi the web password changes without notice to your WiFi password. So you need to login to the web admin interface with admin and your WiFi password. This somewhat wierd behaviour again shows the immature state of the firmware.

Posted by: @batpred

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After connecting the stick to your home WiFi the web password changes without notice to your WiFi password. So you need to login to the web admin interface with admin and your WiFi password

I need to get my head around this.
It would appear to be a security risk.

Your (secret) WiFi password is being replicated so as to act as the password to a website.
Have I understood this correctly?

Thus your WiFi password has been sent to a server outside of your home.
Correct?

Posted by: @transparent

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Posted by: @batpred

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After connecting the stick to your home WiFi the web password changes without notice to your WiFi password. So you need to login to the web admin interface with admin and your WiFi password

I need to get my head around this.
It would appear to be a security risk.

Your (secret) WiFi password is being replicated so as to act as the password to a website.
Have I understood this correctly?

Thus your WiFi password has been sent to a server outside of your home.
Correct?

This is/was essentially to access the inverter admin via http and modbus protocol, I think. The wifi access to the inverter is via a USB dongle that can be optionally connected to the inverter (that they call the datalogger). Solis has a long list of datalogger models, I am not sure if this default password is for the latest model, etc. 

The way it read to me (and I cannot even confirm if it is still working like this), does not indicate best practice.

You can connect to the dongle that they supply via ethernet or wifi and I am using ethernet. I suspect most Uk homes will not use several wifi networks like we do. But if this risk is still present on the latest firmware of the dongle you are planning to use, configuring a dedicated wlan could be a simple compensating measure..

Solis provided me with some information on hardening security and it did not seem careless. Of course that the dongle that they do not even advertise that they supply (and is for optional use) is far from "military grade"... 

Posted by: @transparent

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Or alternatively, forget the need to get entrenched with compatibility lists,
and instead get acquainted with the Open Modbus Standards and certification from the SunSpec Alliance.

Even if I also wish that Solis would apply common sense consistently, that is just our wish. 

So I feel I should to reiterate to readers that the Solis "compatibility list" may grow but if your installer ignores it, some of what you had paid for may have to be ignored.