Thank you for this advice. My issue is that I built an environment around the first 2016 emonPi with the added emonTX, including a Great Wall display of energy use covering items important to me, and using the included NodeRed connected to smartEVSE giving me a very safe 11kWh single phase EV maximum charging regime, plus the ability to perfectly match the solar input when required. The sample rate was increased with a patch from Glyn Hudson to 1.5s which made the entire solution both great and safe. The physical wiring alone for this solution was not easy (included charging contactors and a charging cable able to safely pass 48a single phase).
After 8 years of uninterrupted and very successful use, NodeRed suddenly lost its connection to the emonPi data (something to do with mqtt?). I stupidly went into emonPi and accidentally (unintentionally) updated emonPi with disastrous results. A few months ago with your and Trystan’s assistance I tried to regress to the very stable emonSD 16 Oct17 to re-create the successful system, but I could not stop it upgrading and becoming too difficult for me to use.
I understood from forum comments that the latest emonSD is not able to successfully run on the original emonPi and as you point out in any event is not suitable for a mixed emonSD and NodeRed application as was the original. Also, the Open Energy Monitor team confirmed that the sample rate cannot be improved from the current 5s so this is not able to drive the feedback required by the smartEVSE.
This issue is entirely my fault; I so wish I had cloned the very successful original. Recovery would be so simple! I really do not wish to abandon the current setup but I am now lost for a solution, given you advice.
I have a copy of emonSD-07Nov16.zip if this would help?
Also, I’m not sure that
is true.
I think it depends on the version of RPi - I have a Raspberry Pi 2 Model B Rev 1.1 - 1GB (Sony UK) running emonCMS Version: low-write 11.9.10 from emonSD-01Feb24,
and a Raspberry Pi 3 Model B Rev 1.2 - 1GB (Sony UK) running an older (emonSD-10Nov22) emonSD image as it’s a real pain to shrink the image to fit on a 8 GB SD card, but the EmonCMS version is updated likewise to low-write 11.9.10
I think you are likely to have to modify your installation. Things have moved on in 10 years.
Re the emonPi V1, there is a note on the downloads page and I think therefore you should be able to get the emoncms part working again. However, as you say, the minimum feed time is not as short as you would like (I think it is now 10s).
Do you still have access to the NodeRED flow? IME migrating NodeRED flows is a nightmare!
For directly matching your charging to excess solar, these devices are not really the best option. I think there are a number of dedicated solar diverters now available which may meet your need.
I have just worked out that my issues with the attempt to install 26Oct17 are due to the image failing to boot Raspberry Pi. My hardware is fine with later versions downloaded just for test purposes so I am confident that it is the image. Earlier emonSD versions prior 21Jul21 are not available, except the corrupt 26Oct17 image, which I have downloaded several times, all fail. I would very much like to access the 07Nov16.zip as it would simply enable me to re-enable my system. Does this forum allow personal messages? Or can it be attached to a post? Many thanks
