Emonpi for solar water heater

Hi!

First thanks for all that greats open-source things!

I made a solar water heater and for now I use arduino + linux pc + kst to monitor data from csv file.

Now I want to make it more user friendly.

For me, connection to web is optionnal, I prefer something that work locally, that I can use far from wifi hotspots.

So as i understand, with your Emonpi running Emoncms I can monitor data by connecting to it with my phone or PC. Great, and if needed I can publish on Emoncms.org

Questions:

- Is the Sdcard failure solved, and can I use it to log data localy for long term with big card?

- What material do I need to mesure 6 temp with DS18B20? and can I connect more than 6 sensors?

- How to control pump and valves? wifi relay card? is it possible to add wired relay on Emonpi like this https://www.youtube.com/watch?v=OQyntQLazMU

- Can I control relays from Emoncms (if temp1>45 then start pump) or do I need to write scripts, or maybe using node red? In this case, what about low write?

Thanks for your answers.