NRG USER MANUAL
SymphoniePLUS3 User Guide
SymphoniePLUS3_DataLogger_Manual
Rev. 17
support@nrgsystems.com | Page 71
31 December 2018
Connecting the PV Panel and/or External Battery Wires
The iPack has an extra set of terminals that allow for connection of an external 12 V DC power source
such as a battery in addition to the PV panel. Basic rules and explanations of those connections are
outlined in the table below and on the iPack itself.
NOTE: If the iPack battery is not fully charged before being installed in the field, the battery may discharge faster
than the photovoltaic panel can recharge it. This is more likely when using sensors with greater rates of power
consumption such as barometric pressure and relative humidity sensors. Like most lead acid batteries, if the iPack
battery remains at low capacity for an extended period of time, the battery will no longer accept or maintain a
charge.
Trimming the Hose Clamps
The hose clamps are long enough to mount the shelter box to towers up 10 inches (25 cm) diameter. If
your tower is a smaller diameter, it will speed up the installation to trial fit the clamps to your tower and
trim them to length. Place your hand between the tower and the clamp to allow for the logger. Trim off
the excess hose clamp material using a pair of tin snips. Be careful not to cut off too much. Note that if
you have a drill on site, it may not be necessary to trim the hose clamps.
Connection Point
Do
Do NOT
Functional Notes
PV Terminals
Connect PV panels
DC power sources between
14 and 28 V DC
Connect power sources in excess
of 28 V DC, including large PV
panels
The PV terminals will charge the
iPack’s internal battery; The PV
terminals will NOT charge an
external battery.
External Battery
Terminals
Connect 12 V battery
External charge controller
up to 14.3 V DC
Connect PV panel or power
sources in excess of 14.3 V DC
The external battery terminals are
an input only, an external battery
will NOT be charged from the iPack
through these terminals nor will the
internal iPack battery.
Ground Terminal
Connect to logger ground
stud
Trim ground wire to the
required length
Leave disconnected
Connect other wires such as
shields;
Coil or roll excess ground wire.
This terminal will help provide
protection from electrostatic
discharge for the iPack and logger.