I use IoTaWatt (http://iotawatt.com/) for solar/energy monitoring at
home.  It works with a standard web browser (no app required) and
doesn't require any kind of Internet/cloud connection (but can use one
if desired).  It will keep years of data internally on the SD card and
you can make pretty graphs from your phone/laptop/whatever web
browser, or you can download the data and do whatever you want with
it.  It is an open source software/open hardware design by a guy in
New Hampshire.  It is manufactured in the US, and it is ETL
certified. ("The hardware is professionally manufactured in an ISO9001
contract facility in New Hampshire, USA. The base units are ETL safety
certified to UL standards")

See pics of my setup here: http://www.wlug.org/files/iotawatt/

$314.30 gets you a US 120V bundle with split-core CTs for 14 circuits
(2 mains + 12 branch circuits), 9V AC reference transformer, and USB
power supply.  The split-core/clamp-on CTs are easy to install, just
open them up, place them around the wire, and close them.

If you use non-split-core CTs (not included in the bundle above), you
need to to disconnect the hot lines from each circuit breaker to slip
on the CT, then reattach to the breaker.
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