To: bpehrson@kth.se, amnungu@kth.se, bernt.sundstrom@telia.com, awoniyi@kth.se
cc: robert@herjulf.net, bifrost@slu.se
Subject: Data (power-outage) from Nata/Tanzania router installation
X-Mailer: VM 8.1.0 under 23.2.1 (i686-pc-linux-gnu)
Reply-To: robert@herjulf.net
--text follows this line--

Colleagues,

First data from the pwr and chrge-controller from the Nata installation

http://herjulf.se/misc/pictures/nata/power-outage/nata-pwr-outage.png

For others to understand the low-power router is powered with AC via
an AC-power supply "over" a 12 Volt battery to form an UPS as the power
grid is highly unreliably.

Actually we an power-outage 101203 18:00 to 101203 22:00. Total of 4 hours.
We se the charging current go to zero (purple).

 Also we see the battery voltage (light blue) drop from 13 Volt to  almost 
 12 Volt and is just about to reach the disconnect voltage 12 Volt. (Orange line)

 So according to this we only have 4 hours @ 2 Amp's (Green line line) -->
 About 8 Ah of UPS power in the battery system. I think it needs some further
 investigation.

 We also see se a total power consumption ~25 Watts for the router.

 And the battery temperature starting to increase due to Sun rise
 and ambient temperature.

bifrost subscribers is cc:ed

					--ro