The minimum you would always have is the standard OfGem meter that sits discreetly next to your circuit breaker panel usually. That is free. You can take daily readings, as I do off mine. It's valuable to check this once a day anyway to make sure that something hasn't tripped a circuit breaker.
You can ask your installer for the handheld option which is a portable unit linked by wireless or have a small wall mounted display in the house somewhere. For this, some will charge, others will include it.
Handheld units are usually equipped with a USB connection and memory, so you can download to a computer regularly, eg monthly.
For public systems, eg the Attenborough Nature Reserve visitor centre, it is important to have a prominent wall mounted display to show visitors how the system is performing.
In my case, I opted for the more expensive option of a webrouter, which is a small box that is connected to the inverter at one end and has an ethernet cable to my existing broadband modem. Being connected all the time, it can send an update every 15 mins to a datalogger in Germany that then rebroadcasts the results from my and 32,000 other systems..http://www.sunnyportal.com/
Then click to view 'publicly available systems', then enter Peveril into the search field.
To see others, select your country and size of installation for some 'Renewables Surfing'
http://tinyurl.com/peveril-solar-roof
is a demonstration of mine. Using more of this site, i can see every day for the last ten years or more....
the set up also includes a small weather station giving surface and air temperatures, and irradiation . also sending to the same place.
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