Kaco blue planet PVI 1501i User manual

We reserve the right to technical alterations.
operator’s manual
full of energy

Grid-Tied String Inverter
Blue Planet PVI
KACO GERÄTETECHNIK GmbH
2
operator’s manual (AU)
Important Safety Information
Installation and maintenance of these inverters must be performed by skilled
personnel only. Lethal voltages are present inside the device - therefore, the
device must be opened by skilled and qualified electricians only.
Hazardous live voltages may be present even if the device has been
disconnected. This manual describes how to operate and handle the device
properly. Therefore, please read this manual carefully before putting it into
operation.
Warning symbols used in this manual:
To ensure optimal use of your Blue Planet PVI inverter, please take note of the explanations of the following
symbols used in this manual:
This symbol indicates a feature or circumstance that is important for optimal and convenient use.
Non-adherence to the associated instructions may adversely affect the proper functioning of the
system.
This symbol indicates a fact or feature that is very important for the safety of the user and non-
adherence to which may lead to damage of components or malfunctions or the risk of injuries.
Example: “Disconnect from grid before opening the device.“
This symbol indicates additional information.
Technical alterations reserved –Status: December 2004

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Table of Contents:
1. Short Description of Blue Planet PVI 1501i...............................................................................4
2. Inverter Operation........................................................................................................................5
2.1 Starting-up the inverter ...........................................................................................................5
2.2 Switching-off the inverter........................................................................................................6
2.3 Display Operation and Settings..............................................................................................7
2.4 Setting the Date and Hour:....................................................................................................12
2.5 Communication interface setup ...........................................................................................13
2.6 Operation of the RS232 Interface .........................................................................................14
2.7 Visualization with KACOViso................................................................................................16
3. Technical Data PVI 1501i...........................................................................................................18
4. Troubleshooting and Fault Diagnostics..................................................................................20
4.1 Troubleshooting.....................................................................................................................20
4.2 Transport damage..................................................................................................................22

Grid-Tied String Inverter
Blue Planet PVI
KACO GERÄTETECHNIK GmbH
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operator’s manual (AU)
1. Short Description of Blue Planet PVI 1501i
With Blue Planet PVI 1501i the successful family of KACO photovoltaic line input inverters is now also
available with a performance range up to 2.0 kWp.
Technical features:
Continuous AC output 1.5 kW
AC peak power 1.8 kW
Working without transformer (electrically isolated)
Soundless
Degree of efficiency > 95%
Lightweight: only 10 kg
Small dimensions
Extremely easy to install by means of a mounting panel
Input voltage range 125 to 400 VDC
MPP range: 125-400VDC
RS232 interface as a standard
VDEW conformance
Optional remote Internet monitoring
LCD display showing the following operational data (permanent access):
Solar generator voltage
Date and hour
Solar generator current
Daily yield
Grid voltage
Annual yield
Grid-feeding current
Total yield
Grid-feeding power
Daily operating time
Daily peak output
Annual operating time
Temperature inside device
Total operating time
Operating status
Our name obliges. For more than 60 years, KACO Gerätetechnik has been developing and manufacturing a
variety of different current inverter types and techniques at its location in Germany. High product quality and
longevity are our hallmarks.

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2. Inverter Operation
2.1 Starting-up the inverter
IMPORTANT! The inverter can only be put into operation under daylight conditions (i.e. at a solar
generator voltage of > 100 V).
If no daylight or no solar generator voltage is present, the inverter can be activated by pressing
the gray key (see Page 21, Section 6.3 Operating the Display and Settings), but normal operation
will not be possible in this condition. (Only the values can be read off the display).
1. Switch on the grid voltage (via AC disconnect).
2. Switch-on the solar generator via the DC disconnect.
Response: the green LED “PV generator“ is illuminated (if the generator voltage is greater than 100V).
The display shows the actual generator voltage and the start message: “Start at 130V, measurement:
xxxV."
If the measured voltage is greater than 130V the device will start grid feeding after approx. 4 minutes.
This startup period of 4 minutes is necessary to ensure that the generator voltage is permanently above
the grid feeding limit of 130V.
A quick-start routine is provided for test purposes –this routine circumvents the start-up period. This
quick-start is menu-controlled and obtained from the set-up mode
(see Section 6.3, Display Operation and Settings).
3. During the normal start-up procedure the grid power relay is switched on after approx. 4 minutes (audible
acoustic “click”), and grid feeding is started. This is also signaled by the green “Grid Feeding“ LED. The
display now shows the delivered power. The “Display“ key can be used to indicate the various
measurement values
(see Section 6.3, Display Operation and Settings).
4. It may be necessary to reset the date and hour (please refer to Section 2.4, Setting the Date and Hour:).
5. The inverter is now fully in operation.

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2.2 Switching-off the inverter
To switch off the inverter follow the steps below:
1.) Switch off the DC-disconnect.
2.) Switch off the AC-disconnect
Attention –Lethal Hazard! Hazardous Live Voltage can be present in the inverter even if the
electrical connections have been switched off.
Please wait for 10 minutes before accessing the inverter.
If you have to carry out any work on the solar generator you must additionally disconnect all
connections of the DC main switch . It is not sufficient to switch off the grid voltage in this case!

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operator’s manual (AU)
2.3 Display Operation and Settings
General Information:
In the normal operating mode you will only need the “Display” key 1 to toggle between the individual
measuring values and data. The “Set” key 2 is required for setting the date and hour and to select the
quick-start routine and clear the internal power meter of the inverter.
Display Screen and Operation:
After starting-up the inverter (see Page 17 in Section 6.1, Starting-Up the Inverter), various measuring values
and data are shown on the display. Use the “Display“ key to toggle between the different values and data.
Keep the “Display“ key pressed until the next value is shown. If the “Display” key on the inverter has not
been in use for an extended period of time, the display will automatically indicate the currently delivered
power. The following values and data may appear on the display:
No.
Display message
Explanation
1
Display shown during the starting-up period (in the morning),
after a malfunction or prior to night shutdown. No grid
feeding in this mode of operation. The inverter waits until the
voltage has exceeded a value of 130 V. If this value is
exceeded for longer than 4 minutes the grid feeding will be
started. An audible sound is generated when the grid isolation
relay is enabled.
2
Actual voltage of the solar generator connected to the
inverter. Shown in volts and amps; voltage tolerance 3 %;
current tolerance 5% at rated power. Greater tolerances are
possible when smaller generator currents are displayed.
3
Actual grid voltage, grid current and power (measurement of
the phase into which power is delivered); displayed in volts,
amps and watts; voltage tolerance: 2%; current tolerance:
3 %.
4
Short-team peak grid feeding capacity of the day,
displayed in W.
Daily peak
capacity xxxx W
Line xxxx W
xxx.x V xx.xx A
Solar generator
xxx.x V xx.xx A
Start at 130 V
meas. xxx.x V

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No
Display message
Explanation
5
Display of the actual heat sink temperature, in °C. The
inverter will limit grid feeding if the temperature exceeds
65°C. If the device temperature exceeds 80°C it will be
switched off automatically.
6
Display of the various operating statuses:
Normal grid feeding operation. Power is fed into the
grid.
Waiting for sufficient solar generator power. The
generator voltage is not sufficiently high for grid feeding,
or the grid feeding process was stopped and the system
is re-started after a failure.
Waiting for night shutdown. The generator capacity is
no longer sufficient for grid feeding, and the device
waits for the night shutdown.
The connected solar generator has fed-in more power
than the inverter was able to adjust (short-term). As a
result, a safety shutdown was initiated.
The connected solar generator has supplied excessive
voltage.
There is a problem with the grid voltage, which prevents
grid-feeding.
The display indicates which phases are affected
(overvoltage or low voltage).
The devices changes over to night shutdown.
Temperature
inside xx °
Status:
Overload
Status: Device shut-
down
Line failure
Status:
Overvoltage
Status: Waiting for
shut-down
auf Abfahren
Status: Waiting for
start-up
Status:
Delivering power
operation

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operator’s manual (AU)
No
Display message
Explanation
7
Indicates date and hour
8
Power delivered since sunrise. Display in watt hours
(not kWh!)
9
Power delivered during the current calendar year (January 1
to-date)
10
Power delivered since the time of inverter startup.
11
Today’s operating hours since sunrise. Displayed in hours
and minutes.
12
Operating hours during the past calendar year (January 1
to-date).
13
Operating hours since the time of inverter start-up.
Operating hours
Today xxxxx:xx
Total operating
hours xxxxx:xx
Annual operating
hours xxxxx:xx
Total yield
xxxxx kWh
Annual yield
xxxx.x kWh
Yield today
xxxxx Wh
Date xx.xx.200x
Hour xx:xx:xx

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Reading the daily values after shutting-down the inverter in the evening:
The device shuts down when it begins to get dark in the evening. After that, there are no further display
messages. To read the values of the current day in the evening or at night, you can activate the device by
pressing the gray key (see our illustration). Press the key at the underside of the device for approx. 30
seconds until the message is shown on the display. You can now scroll through the menu and view the
values of the current day.
If the key is not activated for a period exceeding one minute the device will automatically shut-down again.
The inverter only saves the actual values of the day. The annual operating hours, total operating hours,
annual grid feeding, total grid feeding, etc. are saved and accumulated. These data will not be lost –even if
the device has not been in operation for an extended period of time. However, if the device has not been in
use for several days it may be necessary to re-entry date and hour.
Fig. 1 Start button
Please note:
The displayed measuring values, i.e. generator current, generator voltage, grid current, grid voltage, etc.
all have a certain tolerance. This will of course affect the values derived, i.e. delivered power, daily peak
capacity and yield data.
The inverter display is designed to monitor the general operation of your system and to provide data about
Its functionality. However, the actual yield of your PV installation should be determined on the basis of a
calibrated power meter, which is provided by your Utility company (admissible tolerance of your electric
meter: ± 2%).
Accuracy of Measuring Data Acquisition
All measurements and, consequently, all displayed measuring values are subject to tolerances, i.e. measured
values do not correspond exactly to actual values. Depending on the specific requirements the appropriate
measuring elements and circuits are selected.
The measuring elements and measuring circuits of PVI were selected in a way allowing optimum operation
and maximum solar yield. Measuring errors that are within tolerance limits will not reduce the solar yield. Due
to tolerances the daily yields as displayed by the inverter may deviate up to 15% from the power meters
provided by the Electrical Power Company.

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Attention!
In disturbed grids or installations that have to be disconnected from the grid occasionally due to
disturbances, yield data and operating hours may not be displayed properly. This is not an inverter error.
Even if such incorrect values are shown the inverter continues to work properly and without any yield loss.
Similarly, disturbed grids may cause inverter shutdowns during the day, although no obvious errors have
occurred. In this case, the inverter display returns the message “Grid Failure“, and incorrect
measurements may be caused as described above. After such shutdown conditions the inverter continues
to operate properly.
PV Generator LED (green):
This LED is illuminated from a generator voltage of approx. 100 V onward and extinguishes as soon as the
generator voltage falls below 80 V. The PV generator LED signals that the inverter is in its active state and
the inverter controls are enabled. If this LED is not lit up the inverter will not be able to start grid feeding.
Under normal operating conditions the LED is illuminated in the morning when there is enough daylight, and
extinguishes again when it gets dark.
Grid feeding LED (green):
This LED is illuminated during the grid feeding process. To this effect, the generator voltage must first exceed
a value of 130 V for 3-4 minutes, ensuring that the PV generator provides enough power. This means that the
“Grid Feeding“ LED is not lit up unless the PV generator LED is illuminated.
Under normal operating conditions the inverter starts grid feeding in the morning and terminates this process
as it becomes dark. On cloudy days or during the winter months the grid feeding process can be interrupted
at certain times, depending on the PV generator and the actual grid feeding capacity, and can be resumed
later on. This process can be repeated for several times, especially in the morning and evening.
Disturbance LED (red):
This LED is enabled in the event of the following disturbances:
Grid overvoltage or low voltage
Grid impedance or grid frequency fault
Excessive generator voltage
Excessive generator power
Shutdown due to excessive temperature
Defective device.
In general, any of these disturbances will lead to termination of the grid feeding process. If the cause of
the disturbance has been remedied, grid feeding will be resumed after a starting-up period of approx. 4
minutes.
Exception: Failure of phase L1 (grid phase to which electrical power is fed).
In the event of a failure of the grid feeding phase the Disturbance LED is not lit up. In this case, all LED’s and
the display are extinguished and the inverter is shut-down completely. Only after the grid feeding phase is
available again can the inverter resume its normal operation.

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2.4 Setting the Date and Hour:
To change over to the Set Mode, keep the “Display“ key pressed while simultaneously pressing the “Set“
key.
You have now accessed the Setting Mode in which you can set the actual date and hour.
First press the “Set“ key for several times to adjust the correct hour. Use the “Display“ key to select the
minutes and press the “Set“ key until the correct minute is displayed. Press “Display“ again to enter the
date, using the same procedure as described above.
Note: Years are set consecutively, i.e. the year is incremented by one and will return to 2004 after
the year 2050 has been reached.
If, after setting the date and hour, you wish to return to the normal operating mode, keep the “Display“ key
pressed while simultaneously pressing the “Set“ key. You have now returned to the starting menu where you
can select the various measuring values by means of the “Display“ key.
The Setting mode can also be used for selecting the following parameters:
1.) Output of EPROM data (Key 2): Unique output of internal inverter data for diagnostic purposes via serial
interface.
2.) Output of operating data:
Output of operating data via the serial interface. Standard setting: Active.
3.) Clear the power meter: Resets the values shown on the display, i.e. “annual operating hours”, “total
operating hours”, “delivery power per year”, “total power delivery”, etc. (Use the “Set“ key to enter the
required code 2).
4.) Display of the software revision of microcontroller and DSP
5.) Communication interface setup
Quick Start:
The quick-start routine can be used for test purposes or acceptance tests conducted by your local Utility
company (EVU). In this case the inverter can be started immediately (without a delay of 3-4 minutes). As
described for setting the date and hour, change to the Setting Mode first. Keep the “Display“ key pressed
while simultaneously pressing the “Set“ key. You are now in the entry-mode. Using the “Display“ key, scroll
through the menu and select the menu item “Start immediately with key 2 Vxxx“. Now press the “Set“ key –
the inverter is activated after a short time (with an audible click of the relay), and the green Grid Feeding LED
is lit up. If there should not be enough solar generator power the inverter will be shut-down again after a short
period of time.

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Blue Planet PVI
KACO GERÄTETECHNIK GmbH
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operator’s manual (AU)
A B A B
A B A B
PVI
PVI
max. 31 PVI
Phone
A B A B
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230VAC
PVI-
pro
Log
mit Netzteil
PVI
R
ab
2.5 Communication interface setup
Press the “Display“key for several times to select the interface mode. Use the “Set“key to select RS232 or
RS485 communication (standard is RS232).
Press “Display“ again to enter the RS485 address. The address is adjustable in the range from 0 to 31 by
pressing the “Set” key (standard is address 1).
The settings are stored by pressing the “Display“key.
If, after setting the interface setup, you wish to return to the normal operating mode, keep the “Display“ key
pressed while simultaneously pressing the “Set“ key.
Fig. 2 RS485 connection
The termination resistor “Rab”have to be a 330Ohm 1/4W type!

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operator’s manual (AU)
2.6 Operation of the RS232 Interface
Any commercially available serial interface cable is suitable for connecting the inverter to a PC. However, the
cable length should not exceed 20 m.
Inverter data is transmitted via the serial interface
(unidirectional, text only; no error checks).
Pin configuration of the interface:
PVI Sub-D
male 9-pole
Explanations (PC)
PC Sub-D
female 9-pole
2
TXD
2
3
RXD
3
4
RTS
4
5
GND
5
Interface parameters:
Baud rate: 9600 baud
Data bits: 8
Parity: None
Stop bits: 1
Protocol: None
Below are a few example rows of data transmission:
Column 1 2 3 4 5 6 7 8 9 10
04.10.2001 16:55:30 4 363.8 0.37 134 226.1 0.53 103 23
04.10.2001 16:55:40 4 366.0 0.39 142 226.1 0.53 112 23
04.10.2001 16:55:50 4 359.5 0.41 147 226.1 0.53 116 23
04.10.2001 16:56:00 4 369.8 0.42 155 226.1 0.58 118 23
04.10.2001 16:56:10 4 377.0 0.43 162 226.1 0.63 131 23
04.10.2001 16:56:20 4 373.6 0.45 168 226.1 0.63 133 23
04.10.2001 16:56:30 4 364.0 0.48 174 226.1 0.68 146 23
04.10.2001 16:56:40 4 364.3 0.49 178 226.1 0.68 146 23

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Explanation of abbreviations:
Column
Explanation
Colum
n
Explanation
1
Date
6
Generator power in W
2
Hour
7
Grid voltage in VAC
3
Operating mode/status (see below)
8
Grid current, delivered current in AAC
4
Generator voltage in V
9
Grid-feeding power in W
5
Generator current in ADC
10
Device temperature in °C
Explanation of Operating Mode Symbols:
Mode
Explanation
Remarks:
0
Inverter has just switched on
Only after the first start-up in the morning.
1
Waiting mode.
Testing the grid and solar voltage
The inverter waits until voltages have stabilized
and grid feeding can be started.
2
Waiting for shut-down
Insufficient generator voltage and generator
power. Condition that precedes the night
shutdown.
3
Constant voltage regulator
At the start of the grid feeding process constant
generator voltage is fed-in for a short time
(80% of the measured no-load voltage)
4
MPP tracker; continuous search movement
At times of low insolation the grid feeding takes
place via the searching movements of the MPP
tracker.
5
MPP tracker, without searching movement
At times of high insolation maximum yield is
ensured by means of a patented MPP tracker.
9
Troubleshooting operation
Initiated whenever an internal error occurs.
10
High-temperature cut-off
The inverter is automatically cut-off in the event
of excessive temperatures (heat sink
temperature >80°C) due to continuous overload
or lacking air circulation. Possible causes of
overheating can be over-dimensioning of the
solar generator, excessive ambient temperature,
or inverter defects.
11
Power limitation
Protective inverter function –activated if
excessive generator power is delivered or the
heat sink of the device has exceeded a
temperature of 65°C.
12
Overload cut-off
Protective inverter function –protects against
excessive generator power.
13
Overvoltage cut-off
Protective inverter function –protects against
excessive grid voltage
14
Grid failure
Protective inverter function. Becomes effective if
the grid voltage or frequency is out of tolerance.
15
Transition to night shut-down
The inverter “goes to sleep“.
Note: Codes that are not listed above are not assigned / are not used.
Data transfer is independent on whether or not a computer has been connected. A status line such as
described above will be sent every ten seconds via the RS232 interface. At the end of a workday these
10-second-values can be summarized into a complete "profile" of the day.

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The interface of the connected PC or laptop must comply with the RS232 interface standard. Some computer
manufacturers are not 100% compliant with this standard - in these cases there may be problems during data
transfer.
Please note that the current and voltage measuring data are subject to the tolerances stated. These values
are not suitable for measurements of the degree of efficiency or yield data and should only be used to
monitor the general functions and operation of an installation.
Data can be transmitted via any available terminal emulation supplied with all types of operating systems or
by using the KACOViso visualization tool.
The KACOViso program is available for free download from http://www.kaco-geraetetechnik.de
2.7 Visualization with KACOViso
KacoViso is a Windows-based software enabling the visualization of PV installations. Together with Blue
Planet PVI, KacoViso assumes the function of a data logger and graphically evaluates and processes the
values indicated on the inverter display. Data is transmitted to a PC via the serial RS232 interface (connected
to Blue Planet PVI as a standard) and stored by KacoViso. This means that you only need a PC and Blue
Planet PVI to log your data and no additional equipment is required, which makes KacoViso ideal for
subsequent upgrading of older photovoltaic installations without any changes to be performed on the grid-tied
string inverters.
Fig. 3 Daily yield curve

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Fig. 4 Month yield curve
All important parameters of an installation can be shown as daily or monthly curves by means of different
types of graphs. The selection of the type of graph is user-specific and can be combined in any desired way.
For example, a daily yield curve can be displayed as a 2D bar graph or as a 3D area chart showing the
temperature and grid current curves.
The readings can be displayed online and based on earlier data records.
Easy operation and automatic chart generation offer a fast and efficient way of monitoring and visualizing
your PV installation.

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3. Technical Data PVI 1501i
Input –Electrical Data
Type
PVI 1501i
DC rated power
1570 W
Max. PV generator power
2000 W
MPP range
125-400 VDC
No-load voltage
Up to 400VDC
Monitoring of input voltage
Stand-by starting at Ue>125VDC
Night shut-down from Ue<100VDC
Max. DC input current
15 A
Polarity safeguard
Short-circuit diode
Overvoltage protection
Varistors
Output –Electrical Data
Rated power
1500W
Max. power
1800W short term
Grid voltage
190 ... 264 V
Rated current
6.5 A
Max. current
7.8 A
Power factor
1
Frequency
50Hz 1%
Distortion factor according to VDE0383
<3% at rated power
<5% over the entire range
Inverter –Electrical Data
Max. degree of efficiency
94.5 %
European degree of efficiency
93 %
Internal consumption
0 W with night shutdown
< 5W during operation
Min. grid-feeding power
10W
Circuit design
Grid-conducted, electrically isolated,
RF transformer
Clock frequency
18 kHz
Principle
1.) Potential-free DC/DC converter
2.) IGBT full bridge as part of the inverter
Grid monitoring
BISI according to E VDE 0126 VDEW-compliant

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Inverter - Mechanical and Technical Data
Optical displays
PV-generator (green)
Grid-feeding (green)
Malfunction (red)
Illuminated LCD display (2 x 16 characters)
Operating elements
2 keys for display operation
Connections
AC-connection via plug-type connectors
DC-connection via MC or Tyco-type plugs
Ambient temperature
4°F … 122°F (-20°C ... +50°C)
Temperature monitoring
> 65°C: temperature-dependent power adjustment
> 80°: disconnection from grid
Cooling
Free convection (no fans or blowers)
Protection Class
IP54, according to EN 60529
Noise emission
< 35dB (noiseless)
Enclosure
Aluminum wall-mounted enclosure
Dimensions W x D x H
Approx. 300 x 180 x 370 mm
Weight
10 kg
Standards and Regulations
Protection Class of the device: 1 (Basic insulation + PE connection)
Protection Class of connected modules: 2
VDEW Conformance (VDEW = Association of German Power-Generating Plants):
According to the regulations of the Association of Power-Generating Plants: Guideline for the parallel
operation of photovoltaic power generating plants; guidelines for the parallel operation of independent
power generating plants on the low-voltage grid of Electrical Supply Companies.
4th revision 2001
EMC test procedures according to EN50081-1:1992, EN50082-1:1997
Emitted Interference: EN 55014-1:1993
Interference immunity: EN55014-2: 1997
Harmonic currents: EN61000-3-2: 1995
Voltage fluctuations + flicker: EN 61000-3-3: 1995
Semiconductor inverters: EN 60146 Part 1-1: 1994; EN60146-1-3: 1994
CE marking according to Directive 93/68/EWG
Including:
Low-voltage directive for electrical operations according to Council Directive 71/23/EWG;
Electromagnetic compatibility according to Directive 89/336/EWG

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4. Troubleshooting and Fault Diagnostics
4.1 Troubleshooting
Within the scope of our continuously expanding Quality Assurance System, our goal is to rule out and
eliminate any faults and defects. You have purchased a product that has left our factory in a proper condition.
Each individual device has successfully passed extensive inspection tests for proper operation and
functioning of protective devices, as well as a long-duration test at our factory.
Should your PV installation not work properly despite all these measures, we recommend the following
procedure for remediation:
Check the solar generator and grid connections leading to the PVI, observing all the safety instructions given
in this manual. Please observe the inverter carefully and take note of the display messages and LED
displays.
Below is a summary of possible error and recommended remedies:
Error
Cause
Remedy / Explanation
Inverter shows an
unrealistic daily peak
value
Grid voltage failure
Even if an incorrect daily peak value is displayed the
inverter continues to work properly and without any yield
losses. Values are reset overnight. If you wish to reset the
display immediately, disconnect the inverter and the DC
grid voltage supply and switch on the inverter again.
Daily yield values do
not correspond to the
values shown on the
power meter of the
Utility company.
Tolerances of the
inverter’s internal
measuring elements
Measuring errors are caused by tolerances of the
measuring elements. The tolerances of the individual
measuring values are shown in Section 6.3, Display
Operation and Settings. The daily yield value may deviate
from the value shown on the power meter by up to 15%.
No display shown
1.) Device is in the
night shut-down
mode
2.) No grid voltage is
present
3.) Solar generator
voltage is less than
110 V
The inverter shuts down over night.
If the display should not be illuminated during a normal
time of the day you should check on the power meter
whether or not the device delivers power. If power is
delivered the display module is defective, and the inverter
has to be returned to KACO for repair.
If no power is delivered you should check that grid voltage
is present and that the solar generator voltage is higher
than 110 V.
If this is the case but the inverter still fails to deliver power
the device has to be returned to KACO for repair.