Product Manual

Operation
16 900-0161-01-01 Rev B
UPS
In
UPS
mode, the Radian’s parameters have been optimized to reduce the response time.
If the utility grid becomes unstable or is interrupted, the Radian can transfer to inverting with
the fastest possible response time. This allows the system to support sensitive AC loads
without interruption.
BENEFITS:

Constant power is provided to the loads with virtually no drop in voltage or current.
NOTES:

Due to the need for the Radian inverter to react quickly to AC source fluctuations, it must remain fully
active at all times. The inverter requires a continuous consumption of 42 watts.

For this reason, the
Search
function does not operate in this mode. (See page 23.)
Backup
The
Backup
mode is intended for systems that have utility grid available as the primary AC
source. This source will pass through the Radian inverter’s transfer circuit and will power the
loads unless utility power is lost. If utility grid power is lost, then the Radian inverter will supply
energy to the loads from the battery bank. When the utility power returns, it will be used to
power the loads again.
BENEFITS:

This mode will continuously maintain the batteries in a fully-charged state, unlike the
Support
mode.
It does not have the overhead consumption of the
UPS
mode.
Mini Grid
In
Mini Grid
mode, the Radian inverter automatically rejects an AC source and runs solely from
battery (and renewable) energy. The inverter only connects to the AC source (usually the utility
grid) when the batteries run too low.
The inverter runs on battery-supplied power for as long as the batteries can be sustained. It is
expected that the batteries will also be charged from renewable sources such as PV. When the
batteries become depleted, the system reconnects to the utility grid to operate the loads.
The inverter will reconnect to the utility grid if the battery voltage decreases to the
Connect to
Grid
set point and remains there for the
Delay
time period. These items are shown in Table 17
on page 63.
While connected to the utility grid, the inverter’s charger can be set either On or Off. If the
charger is turned on, the inverter will proceed through a full charging cycle. Upon reaching the
end of the charging cycle, the inverter will disconnect from the grid.
Failure
Failure