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Earthing options for Option 1 and 2
Inverters tend to come in 2 different versions.
Centre tapped Earth ( fig 3 )
where, in effect, you have no real live and neutral but 2 lives and no neutral . You have 110V on either side of the
earth terminal making 220V across the two pins (live to “neutral”) but both pins are actually live. This is the most common and is default on this
range of inverters products
. If no RCD is used this would probably be the best / safety option. The worst case event you will only get a 110V shock,
however, it is recommended that a RCD be used on all inverters but we recognise that a lot of people do not use RCDs* especially with smaller
units, so,alough ilegal to do so, we can only give the best advice to our customer base who adopt poor practices. It is Sterling Power Products actual
advice that all inverters should be used in conjunction with a RCD for ultimate safety and to comply with electrical installation codes. If you do fit a
RCD (as you are suppose to) a centre tapped inverter would be your safest option, but it
will not operate a
RCD safely it is, therefore, vital that if
you want to use a RCD in line with the AC output then the inverter unit must be converted from
Centre tapped earth
to
Neutral earth bonded
,
failure to do so will render the RCD ineffective.
Neutral Earth bonded ( fig 4 ),
this is where the neutral is tied to the earth terminal giving 230V across the live and neutral ( more in keeping with
the actual mains configuration ) but also 230V from live to earth. This allows a RCD to safely operate and confirm with hard wire installation
requirements on vehicles and boats etc.
To convert Option 1
type unit from Centre tapped earth to Neutral earth bonded simply connect the enclosed link (small fuse) into position 11 on
Fig 1.
Live
Live
Earth
110 v
110 v
220 v
Centre tapped
Live
Neutral
Earth
220 v
0 v
220 v
Netural Earth Bonded
Sterling GANL Fuse holder
with correct GANL Fuse
( see specification )
Battery
+ _
Sterling
Isolation switch
Option 1
Type
with twin
output
sockets
English or
Euro plug
IN Line RCD
230V AC
earth to vehicle
chassis or boat
bonding system
For RCD to work
convert to Neutral
Earth bonding
see above
Sterling GANL Fuse holder
with correct GANL Fuse
( see specification )
Battery
+
_
Sterling
Isolation switch
Option 2
Type
with Pre
wired
RCD
230V AC
earth to vehicle
chassis or boat
bonding system
Live
Earth
Neutral
Fig 3
Fig 6
Fig 5
Fig 4
Optional
remote control
with 10m
cable
Optional
remote control
with 10m
cable
*RCD = Residual earth detector / Breaker / earth leak detector.
Pre-fitted RCD
Installation for Option 1 twin socket product
All electrical installations should be carried out by a professional electrician,
any doubts about installing this should be addressed to us as soon as
possible. Do not install this unit if you are not competent to do so, high
voltages are involved and have the potential to kill you.
6) Secure the unit in position, fit DC fuse and isolation switch as required in
position as per Fig 5. fuse size table on page 4
Installing Option 1 twin front sockets
7)
1) Fit in a cool dry well ventilated space as close to the battery bank as
possible.
2) Ensure at least 2 of the 5 mounting supports are screwed to the bulkhead.
3) Where cable is not supplied (1000-2000 units) or cable requires extending
ensure the cable is large enough to deal with the cable runs.
4) Install DC cable fuse into each installation fuse size per unit in
specification.
5)
Do not reverse the DC cables.
Connect the red cable to the positive
terminal and the black cable to the negative terminal of the battery, reverse
Ensure that the inverter has the correct voltage for your boat or
polarity could destroy the unit and would not be covered under warranty.
vehicle.
8) In the event of this unit being installed into a ring main or extension
power circuit. The output voltage of this unit must never be on your AC
system at the same time as the 230V external mains line.
If the output
voltage is to be used on a ring mains system, a suitable two-pole crossover
switch must be used. Failure to do this will result in the destruction of this unit
even if switched off that the time and not covered under warranty
9) Only use products that are within the ability of the inverter to operate them,
also, take into account overload requirements on things like fridge motor as
by removing the small link cover at the rear of the unit under the
inserting the small fuse link into the rear of the unit under the neg
gable/connector, then insert the small fuse link and re cover, the unit is
now Neutral earth bonded . (Position 11 in Fig 1). This will ensure the
safe operation of the RCD.
It is good safety sense to use in conjunction with a RCD. If a RCD is
to be used then please convert this model to NEUTRAL Earth bonded
Ring Main
Earth