Inverter Connection - amberroot REHUB MPPT 48 User Manual

3.7 Inverter Connection

REhub is meant to add SAFE Solar PV to existing Inverters. The Mains input LIVE of the Inverter
is controlled by REhub. Disconnect the mains to Inverter connection and connect line cable to
REhub Line out socket.
The rated load current of the connected
inverter MUST be less than 100A. Keep the
inverter in away/off mode till you are ready
for the final power UP.
3.8 Mains
Control: Switching Between
Forced ON and Auto Control.
REhub by default is in Auto control of the
Mains Switch. REhub decides to switch off the
AC Mains input to the Inverter based on the
availability of Solar energy and the state of
charge of the batteries. This forces the
Inverter to use Solar energy to service the
Loads. Similarly REhub auto restores the
Mains connection when there is no Solar
energy or the state of charge of the batteries
is below a set value.
As a user you can decide to OVERRIDE the
decision of REhub by forcing REhub to keep
the Mains switch ON. In ONAlwas (For On
Always) mode, REhub keeps the Mains ON at
all times. In ON1Day (for ON One Day) mode,
REhub keeps REhub ON for the next 24 Hours
and goes back automatically to Auto Mode at
the end of 24 Hours. These Override modes
may be required in case the day is very
cloudy and Inverter is toggling frequently
between using Solar and using the Mains to
power the load. Alternately, these modes
may be required if heavy loads like Mixer-
grinder is connected to the lighting circuit
supported by the Inverter. When running a
Mixer, switch to ONAlwas or ON1Day mode
when power is available, to ensure the
Inverter is not delivering power from the
batteries to the Mixer. Make sure to switch
back to Auto when the desired usage is
completed.
Offgrid mode is a special mode in which the
MAINS power is not used unless the battery voltage goes very low. In Offgrid mode, REhub does
not switch on the Mains input to the Inverter even if Solar is not available. This mode is different
from the Auto mode in the way REhub switches on the Mains input to the Inverter. In Offgrid
mode it automatically switches on the Mains input only when the battery voltage reaches a set
low value.
Ver 2.0
Relay Operation
Check to make sure LINE&
Neutral are NOT Swapped
Sometimes the LINE and Neutral is
swapped between the Input wire of the
Inverter and the Output Load socket. Even
with the swap prior to the installation of
REhub, the problem is not seen because
the Inverter delivers output from the
batteries only when the Mains are not
available. So a Line- Neutral swap from
input to output is not noticed
However when the Inverter's Mains input
is connected to REhub with the LINE –
Neutral interchanged between AC input
and output Load and when REhub forcibly
switches off the MAINS input to the
Inverter (even when MAINS power is
available in the daytime when Solar is
available), the Output Load may get
dangerously high voltage, because the
Inverter is delivering output from the
Batteries and the MAINS is also available.
Sometimes, the Neutral wire is connected
to the Live input of REhub. REhub operates
by switching off the Mains input to the
Inverter. This operation will not happen if
the Neutral is connected to the Live input
of REhub because the relay then is
switching ON or OFF the Neutral line and
not the LIVE!
Always make sure that the Input to Output
LIVE pins have continuity and that LIVE
and Neutral are not swapped in the
Inverter.
8 REhub MPPT 48 User Manual