Selectronic Australia LD350-24 Operating Manual

LD350-24 Volt Owners Manual

LD350-24 Operating Manual

Serial No _____________________________ Purchase Date ______________

Note - Your 2 Year Warranty can only be valid once your warranty card is completed and returned to Selectronic Australia

USTRALIA

ELECTRONIC

A

S

Contents Page No.

Introduction 1
Warranty Card 1
Installation 1
Batteries and Connections 4
Getting Started Quickly 6
Parts Identification 6
Operation 7
STATUS Indicators 7
Demand Start Setting 9
Low Voltage Shutdown Setting 10
Maintenance 11
Inverter 11
Batteries 11
Handy Hint 12
Radio Frequency Interference 13
Fault Finding 14
Product Warranty Conditions 15
Specifications 16
Selectronic Service Network Back Cover

Legend for Symbols

Warnings and

electrician’s notes

Hints and Pointers

Examples

Large amounts of DC current can be drawn by your LD350-24, care must be
taken.

Introduction

Thank you for choosing to purchase the Selectronic LD350-24 TRUE
SINE WAVE inverter. Many hours of Research and Development have
gone into the LD350-24 to ensure this inverter provides you with many
years of reliable service

Fixed Installation

All fixed installation battery connections must be securely bolted,
using stainless steel nuts and bolts. To protect the connection from
corrosion smear a small amount of Vaseline or similar over the joint.
Never place batteries directly onto a concrete floor, place timber or
similar material beneath the batteries.

Warranty Card

It is imperative that you complete your warranty card NOW. Your LD350­24 is covered by a TWO-year warranty; this warranty is in addition to your
rights under the trade practices act of your state or territory.

LD350-24

Inverter

Battery Bank

*System Fuse

To Load

Returning you completed warranty card will enable us to register your
warranty and avoid any possible delays should service be required. If you
have any comments about our product that will not fit on the warranty card
please feel free to drop us a line. Yes, constructive criticism will also be
welcome.

Installation

200mm

200mm200mm
LD350-24
Inverter

Front

200mm

LD350-24 Inverter

* A system fuse (of at least 20 Amps) should be placed before the battery.
An HRC motor start type is recommended. (See your system designer for
details).

Warning

As a matter of safety, Selectronic strongly recommend that all fixed
installations be designed and installed by appropriately qualified person. The Solar
Energy Industries Association in your state or territory can provi de na me s of accredit ed
system designers and installers.

All AC wiring MUST be carried out by an accredited electrician a nd must co nform to
AS3000 and/or any relevant local standards.

The output voltage from an inverter is as lethal as mains electricity.

Electrician’s Note

• All earth’s AC and DC should be bonded

• RFI/Lightning Earth stake should be within 3m of the inverter

Please leave a clearance of 200mm on all sides and top of the Inverter.

• The LD350-24 is suitable for connection to MEN wiring

The LD350-24 must be installed in a dry, cool, dust-free environment.

• Any AC changeover switch must be a ‘break before make’ type

It is recommended that the inverter be placed as far from any radio
receivers as possible.

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Portable Use Batteries and Connections

By using optional battery clips, the LD350-24 can be connected directly to
a vehicle battery. When using Alligator clips ensure they have a tight grip
around the battery post. Wherever possible battery connections should be
bolted. If connecting the LD350-24 through a cigarette lighter socket the
maximum power output of the LD350-24 will be severely

restricted, this

practice should be avoided. Check with your supplier or installer if you are
unsure.

Batteries are the key to maximum performance from your LD350-24, if a
battery is too small or not fully charged it may result in de-rated
performance from your LD350-24.

Battery ratings

Batteries can be rated in one of two ways:

1. CCA = Cold Cranking Ability. This is the am ount of power or current that

a battery can deliver for a short period, typically a few seconds. This how
a car battery would normally be rated.

Do not use alligator clips in a moving vehicle

Auxiliary Battery

Earth (to chassis)

LD350-24 Inverter

Earth (to chassis)

Isolator

Vehicle
Alternator

2. Ah = Ampere Hours. This is the maximum amount of energy that can be

stored in a battery; this figure will generally be stated at a particular hour
rate. This is how a deep cycle or storage battery would normally be rated.

Start Battery

By incorporating an auxiliary battery in the manner above, the starting battery
should remain charged for vehicle starting (see your auto electrician).

The LD350-24 has sufficient battery cable length to allow it to sit underneath the vehicle
whilst in use. If the ground is wet, place the LD350-24 on a waterproof liner.

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100Ah @100hr, this means that when this battery is discharged over
a period of 100 hours, the battery has a capacity of 100Ah. This in
theory means 1 Amp for 100 hours, although this would in practice
result in a totally discharged battery that may not then recover.

To achieve maximum performance from your LD350-24 you must have a
battery capable of delivering 75 Amps for a short period whilst
maintaining at least 21.0 volts. To increase the capacity of your battery you
may need to join more than one battery together.

• Where batteries are joined

in series, add the voltage of
each battery.

The capacity will equal the capacity of the smallest battery. 2 x 12
Volt 150 Ah batteries connected in series would have a total
capacity of 24 Volts – 150 Ah.

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Where batteries are joined
in parallel, add the capacities
together, the voltage will
remain the same as each
batteries voltage.

Getting Started Quickly

2 x 24Volt 150 Ah batteries connected in parallel would have a
capacity of 24 Volts – 300 Ah.

Only use identical batteries when joining batteries together.

How long will my battery last

To work out how long your battery will last follow this basic guide.

This guide presumes commencing with a fully charged battery.
Take the total rating of the appliance being run
1 light globe 25watts
1 20 inch TV 67watts
1 VCR 30watts
Total load =122watts

Divide this figure (122) by 20 to know the approximate DC current draw

=6.1Amps

To convert this to Ampere-hours, multiply by the number of hours used -

Say 1 hour =6.1Ah
So if we have a 150Ah battery, then with the above example we should have
150 minus 6.1 = 143.9 Ah remaining in the battery.

As a general guide never discharge a battery below 50%. The deeper
a battery is discharged on a regular basis, the less life you can expect
from the battery. The Ah rating of a battery will also be reduced if
the drain current is greater than the rated discharge current. See your
battery specifications for full details.

If you want to get powered up quickly here are the 11 simple steps.

1. Familiarise yourself with the details in the first 6 pages on this m anual.

2. Unpack the LD350-24 from the packaging.

3. Check unit for any damage that may have resulted during transport, if any

damage is evident report this to your supplier immediately.

4. Make sure the LD350-24 ON/OFF switch (12) is in the off position.

5. Connect battery positive wire (red) (10) to battery positive or battery fuse.

6. Connect battery neg. wire (black) (11) to battery negative or battery fuse.

7. Plug a 230 - 240V appliance into inverter front power point (8) but do not

switch on.

8. Turn ON/OFF switch (12) to ON.

9. After 3 seconds LED (1) will begin to flash. If no LEDs light, check for

correct connection to battery.

10. Turn power point (8) on

11. You’re away.

LD350-24 Parts Identification

LED (1)
LED (2)
LED (3)
LED (4)

ON/OFF Switch (12)

LED (5)

Mode Button (7)

(8) Power Point/GPO
Positive (Red) Battery lead (6) can be viewed from the rear.
Negative (Black) Battery Lead (7) can be viewed from the rear.

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LD350-24 Manual Selectronic Australia

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Operation

LED (2) AC Overload should normally remain OFF. If the inverter shuts
down due to too much AC load being drawn from it then LED (2) will come
ON. The LD350-24 will remain in this condition for 1 minute after the AC
load has been decreased to a safe level. LED (2) will flash if the inverter shuts
down due to “time to shutdown”, see page 18

Five LEDs are provided on the front panel to indicate a number of
parameters, and allow adjustment of some of these parameters.
LED (5) tells you what LED (1) – (4) is displaying as indicated on the front
panel of the LD350-24. Pressing Mode Button (7) will change the information
being displayed.

• If the inverter remains in this condition after one minute, switch (12)

should be turned OFF and then back ON.

STATUS indicators LED (5) (green) flashing

LED (3) DC Volts Low / High should normally remain OFF. If the inverter
shuts down because the battery volts are too high then this LED (3) will come
ON. It will remain ON until normal battery volts are restored.

When power is first applied LED (1) should flash.
When LED (5) (green) is OFF, this indicates the LED (1) – (4) is showing the

inverters STATUS, as per written notation to the right of the LEDs. In this
mode there are no adjustments to be made.

• If the inverter shuts down due to not enough battery volts, then LED (3)

will flash.

• LED (3) will continue to flash until the battery volts have risen

sufficiently. In this case, charge the battery by starting the vehicle or using
a battery charger.

LED (1) Flashing indicated the LD350-24 is in Demand Start mode, this
indicates that no power is being drawn from the inverter so it has gone to
SLEEP to save power. If no power is used within 12 minutes, the LED (1)
will flash at a slower rate therefore saving more power.

The low voltage point that the inverter will cut out is adjustable to suit your
particular battery, see page 12 for details of this adjustment.

LED (1) Stays ON, the inverter has been commanded to provide power to the
load (e.g. a light switch has been turned on) so it has gone from SLEEP mode
to ON. Once the load has been removed (e.g. the light switch is turned off) the
inverter will wait 10 seconds and return to SLEEP mode.

LED (4) Temperature Overload should normally remain OFF. If the inverter
shuts down due to the heatsink getting too hot, then this LED (4) will come
ON. If the transformer is too hot then LED (4) will FLASH. The LED will
remain ON or FLASHING until the temperature has lowered to a safe level;
the inverter will then come back ON.

It is good practice to have your LD350-24 in SLEEP mode as often
as possible. When the LD350-24 is in SLEEP mode it uses 0.05
amps from the battery, when the inverter is in the ON mode it uses at
least 0.50 amps from the battery.

• If this LED (4) is coming on regularly, either reduce the amount of load

on the inverter or try to move the inverter to a cooler location.

The amount of power required to go from SLEEP to ON is adjustable and is
described on page 11.

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LD350-24 Manual Selectronic Australia

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Demand Start Adjust LED (5) (green) ON Low Volts Adjust LED (5) (green) FLASHING

It is sometimes necessary to adjust the demand start sensitivity to overcome
what is called “Phantom Loads”. A phantom load is a load that tricks the
inverter into thinking it should be ON instead of in SLEEP mode.

To avoid total discharging of your battery the LD350-24 shuts down at a pre­set low voltage. As all batteries are different, so too is the minimum voltage
they should be discharged to. The LD350-24 will leave the factory with a
setting of 22.0 volts, change this setting if required.

The wiring of a house or a portable stereo system in standby are good
examples of a phantom load. These loads serve no purpose but yet can
increase battery drain by bringing the inverter ON. Hold the Mode button (7)
down until LED (5) comes ON, (approximately 1 second) indicating you are
ready to adjust this setting. The LD350-24 will leave the factory with a setting
of 4 watts. Now press the Mode button (7) until the desired value is sought.
LEDs (1) – (4) will return to Status after 20 seconds.

Hold the Mode button (7) down until LED (5) is FLASHING, (approximately
2 seconds) indicating you are ready to adjust this setting. Now press the Mode
button (7) until the desired value is sought. LEDs (1) – (4) will return to
Status after 20 seconds.

Low Volts
Cut-out

LED 1 LED 2 LED 3 LED 4

20.0 Volts

20.2 Volts

20.4 Volts

20.6 Volts

20.8 Volts

Slow Flash
Medium Flash
Fast Flash
Fastest Flash

ON
ON
ON
ON
ON

21.0 Volts

21.2 Volts

21.4 Volts

21.6 Volts

21.8 Volts

Slow Flash
Medium Flash
Fast Flash
Fastest Flash

ON
ON
ON
ON
ON

22.0 Volts

22.2 Volts

22.4 Volts

22.6 Volts

22.8 Volts

Slow Flash
Medium Flash
Fast Flash
Fastest Flash

ON
ON
ON
ON
ON

23.0 Volts ON

Demand Start
Watts

LED 1 LED 2 LED 3 LED 4

4 Watts
5 Watts
6 Watts
7 Watts

Slow Flash
Medium Flash
Fast Flash

ON
ON
ON

ON
8 Watts
9 Watts
10 Watts
11 Watts

Slow Flash
Medium Flash
Fast Flash

ON
ON
ON

ON
12 Watts
13 Watts
14 Watts
15 Watts

Slow Flash
Medium Flash
Fast Flash

ON
ON
ON

ON
16 Watts
Continuous

ON
ON

ON

ON

ON

After “23.0 Volts”, the next button press “rolls back” the Low DC Volts
Cut-out setting to “20.0 Volts”

After “continuous”, the next button press “rolls back” the demand start
setting to 4 Watts

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Once a fortnight or as directed in your battery manufacturer, check the
specific gravity (SG) of each battery cell using a hydrometer, to ensure that
all cells are performing correctly and are properly charged. Any serious
imbalance should be reported to your system designer in case remedial
action needs to be taken.

Maintenance
Inverter

Periodic maintenance of your LD350-24 inverter involves little more than
checking for any obstructions to the black cooling heatsink at the rear of the
inverter. The heatsink must be cleared of any accumulated foreign matter that
may have lodged itself between the fins since the last maintenance check, e.g.
insect nests. Also verify that airflow around the inverter has not become
restricted.

Handy Hints

It is very important that you become familiar with the
functioning of your inverter. From a distance, it is not always
easy to know what if the inverter is On or in Sleep mode. An
easy way to determine this is to plug a small child's night-light
(neon type) into a power point that is easily visible, or replace
this power point with a safety type with a neon indicator. This
will indicate the inverter's operation by flashing when the
inverter is in SLEEP mode and remaining ON when the
inverter is brought ON by a load.

Batteries

1. Every week, carry out a thorough visual inspection of all battery

wiring, taking particular note of the condition of inter-connections
between cells. This maintenance should be carried out in conjunction
with the battery manufacturers recommended maintenance.

Safety Hint

When working on batteries of such high capacity it is
essential that you wear protective clothing, some form of eye
protection and rubber-soled work boots. Please regard your
batteries with a great deal of caution, and if in any doubt,
entrust this work to your supplier / installer.

2. Check that the stainless steel inter-connecting bolts are tight and have

no corrosion. If corrosion is evident, carefully follow the following
procedure.

• Disconnect the system battery fuse before working on the battery

bank.

• Unbolt the stainless steel bolts and nuts of any corroded

connections and thoroughly clean the joint with a wire brush or
file, taking extreme care not to short circuit any battery cells with
any tools.

• Re-assemble and smear a small amount of Vaseline or similar

grease over the surface of the joint to slow down any future
corrosion.

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LD350-24 Manual Selectronic Australia

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Fault Finding

Radio Frequency Interference

No indicators ON when power is first applied

Radio Frequency Interference (RFI) can be a problem for owners of inverters.
RFI in a domestic situation may produce noise or interference on a radio or
TV receiver.

When first connected, if the LD350-24 shows no indicators the battery
connections may be reversed. Check that the red battery wire (10) is
connected to the battery positive, and the black battery wire (11) is connected
to the battery negative. Remember there is a 3 second delay before power is
available after switch ON.

Considerable development time has resulted in a reduction of the RFI
generated by the inverter to a level that complies with C-tick requirements.
Compliance to this standard means RFI is low, but how well the inverter
performs in a particular installation can vary. Below are some suggestions to
help reduce the effects of RFI in your installation;

Inverter stays ON when no appliance is being used

This can be a common problem known as a “Phantom Load”, but can be
easily overcome. Some appliances will need to be switched off at the power
point as they may still represent a small load despite being switched off at the
appliance.

• It is recommended that the power system including the inverter be

housed at least 15 metres from the home.

Check again to make sure that there are no appliances left ON, the
sequentially switch off appliances at the wall and by watching your night light
(as described in Handy Hint, check to see if the LD350-24 returns to pulsing
(SLEEP) mode after a 10 second delay. Once you have found the offending
appliance, increase the sensitivity of the “Demand Start” (see page 11) until
the inverter turns OFF. Once this is done re check that small loads will still
bring the inverter ON when required.

• Ensure an earth stake is placed as close to the inverter as possible and

connected to the inverter via a short length of wire. See page 2 for
wiring details.

• Avoid running DC cables into the home, if at all possible. If this

cannot be avoided, run DC and AC in separate conduits separated by
as much distance as practicable. All DC wiring should also be kept
together and be as short as possible.

Inverter shuts down during the middle of the day, and comes
back ON late in the afternoon

• If your inverter is to be installed in a mobile hom e or similar, try to

keep your inverter at least one metre away from your radio or audio
equipment. The further the better.

This is more than likely caused by high battery volts during peak charging
times from Solar Panels. Battery volts should never exceed 34 volts. If this is
the case, have your Solar Regulator checked.

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LD350-24 Manual Selectronic Australia

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Product Warranty Conditions LD350-24 Volt Specifications

Inverter Type Microprocessor control circuit with PWM full bridge power
stage. True sine wave AC output

Warranty

Selectronic Australia Pty Ltd warrants your inverter to be free from
defects in materials and workmanship under normal use and service,
for an initial period of two (2) years. Defective parts will be replaced
or repaired free of charge within this period.

Conditions

This warranty is applicable only from the date of original purchase.
The provision of this warranty shall not apply if the unit has been

subject to misuse, neglect, act of God, accidental damage or has been
used for a purpose for which it is not intended.

Unauthorised modification or repair will void your warranty.
To ensure a smooth and speedy response to your warranty claim,

please complete and return your reply paid warranty card within 30
days from date of purchase.

Within Australia & New Zealand
The inverter must be returned, at the owner’s cost, to an authorised

service centre listed in this manual. There will be no charge for the
return of the inverter.

Outside Australia & New Zealand
Product purchased for use outside Australia & New Zealand must be

returned to Selectronic Australia’s Service Centre to enable warranty
claims to be processed. Freight cost to be borne by the customer. No
charge will be made for the product return.

Current draw from Battery

Condition Amperage

Demand Start SLEEP mode (average)
Inverter ON, with no Load
Maximum Continuous Load (350 Watt)
Half hour rating (450 Watt)
Surge rating (1000 Watt)

0.05 Amps

0.35 Amps
15 Amps

≈ 23 Amps
≈ 46 Amps

Inverter Power Ratings @ 25º C

Total Inverter output Condition
Wattage @ 1.0pf Current

Continuous
Half hour rating
Surge rating (5 seconds)

350 Watt
450 Watt
1000 Watt

1.9 Amps

≈ 2 amps
≈ 3.5 Amps

Demand Start

Type
Minimum Load to Start
Response Time Normal Pulse Mode

Pulsing AC
4 watts – 16 watts user adjustable
1 second maximum

Battery Voltage Range Voltage

Low DC Volts Cut Out–10 second delay
Low DC Volts Cut In
High DC Volts Cut Out–Instantaneous

20 – 23 volts user adjustable
24 volt
34 volts

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LD350-24 Manual Selectronic Australia

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Selectronic Authorised Service Network

Selectronic Australia

25 Holloway Drive

Bayswater

Victoria 3153

Australia
Ph: 03 9762 4822
Fax: [phone]

[e-mail]

Burley TV Service Rainbow Power Company

278 Edmondson Ave. 1 Alternative Way

Austral Nimbin

NSW 2171 NSW 2480

Australia Australia

Ph: 02 9606-0279 Ph: 02 6689 1430

Fax: [phone]

Reid Technology Ltd
3-5 Auburn Street

Solar Inverter Services Takapuna

13 Thirteenth Ave. North Shore City

Sawtell Auckland NZ

NSW Ph: 9 489-8100
2452 Fax: [phone]

Ph: 02 66581733 [e-mail]

Miscellaneous Specifications

Reverse Polarity Protection
Output Voltage Accuracy 0-350 watts
Output Frequency
Peak Efficiency
Total Harmonic Distortion
Operating Temperature Range
Transformer Type
Cooling Method
Power Point
Chassis Material
Chassis Coating
Size

Full Electronic Protection
± 4% @ 12 volt input
50Hz ± 0.01%
92%
<4%
0º C to 50º C
Toroidal
Controlled fan-forced
10 Amp Single Pole
Zinc Coated Steel
Powder Coated
230W x 130H x 260mm D

SELECTRONIC

A

USTRALIA

25 Holloway Drive Bayswater, Victoria 3153 Australia

Phone [phone] Fax

03 9762 9646

Email

sales@selectroni c.com.au

Part No ST-M-LD352 REV 2 24/02/02

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