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  WVC Modem and the KDM Monitoring System for WVC Micro Inverters
Posted by: admin - 05-01-2019, 02:49 PM - Forum: Alternative Power - Solar, Wind & Hydro - No Replies

WVC Modem and the KDM Monitoring System for WVC Micro Inverters

This is my review of the WVC Modem and KDM Monitoring System for WVC Micro Inverters manufactured by Dongguan KaiDeng (KaiDeng Energy Technology).

Please note that the WVC Modem does not support the 2018 Version of WVC Micro Inverters.
For the 2018 Version of the WVC Micro Inverters use a “WVC WiFi (Wireless) Modem” which is very different to the “WVC Modem” and not reviewed here.

The KDM Monitoring System consists of a Modem that uses 433MHz RF to communicate with the WVC Micro Inverters and some rather rudimentary Software called [obviously] KDM System.

I purchased the WVC Modem (as it’s called) at the same time I purchased a bunch of WVC-600 Micro Inverters (which I reviewed separately here: http://www.computersense.co.nz/forums/sh...hp?tid=245).

What you get in the Box:
You get the WVC Modem, Antenna and KDM System Software. Depending on the “bundle” purchased, the supplied accessories will vary (Serial Cable and/or extended Antenna).
The basic WVC Modem has a Serial Port to connect to a PC – the one I purchased came with a Serial to USB Cable so keep this in mind when purchasing as they are sometimes sold separately.
Also, the one I purchased came with a free-standing Antenna with a 2.5M cable which proved to be invaluable soon after installation.

Installing the KDM Software is pretty straight forward.

You only need to configure two things; 1) the Serial COM Port that your PC recognises the Serial Cable on and 2) enter the 4-digit Hex Numbers of each Inverter (IE: 85F2).
Remember to make note of these numbers when installing the Inverters and their locations and/or the panels they are connected to (I had to remove a couple of panels to get to the Inverters because I forgot to record their numbers – don’t make the same mistake).

This is NOT a WiFi (Wireless) Modem so don’t expect miracles – the Modem simply receives broadcasted RF Data from each Inverter so the Inverter’s Status can be monitored on a PC.

The WVC Modem does NOT “buffer” Data (store historic Data) – meaning that, if the KDM App is closed (or the Computer goes to sleep or is turned off), no output from the Inverters are recorded which impacts the overall recorded power generated.

If you want to send Data to the Cloud then you need to get the 2018> version of the WVC Inverters and their supported WiFi (Wireless) Modem then setup a Cloud Account on the KDM Website.

My Review
The KDM System (Modem and Software) is very basic and sufficient to monitor the health/status of the WVC Inverters. You pretty much get what you pay for (which is not a lot).

For me, I am OK with the KDM System as it does a good job at real-time monitoring of the Inverter’s output. I haven’t yet had an Inverter failure but, if an Inverter failed, it would be pretty easy to identify it.
Recording of historic data is a bit of hit-and-miss and explained here:

At least once a day I notice that one or more (random) Inverters don’t show a satisfactory output.
If I close the KDM Software then re-open it (close it completely, don’t minimise) then the Outputs show a satisfactory level.

If left unnoticed for long periods of time, the total output recorded is way under-reported.

Just as I am writing this review I again noticed a measly 20 watts coming from two Inverters that should have been producing 300W+ each - I closed the app then re-opened it – suddenly the output of the recorded Inverter jumped to 323W!

Sometimes when this happens, closing then re-opening the App doesn’t work – only power-cycling the WVC Modem sorts it out. This is not an output fault of the actual Inverters but a “monitoring” issue. If left unnoticed for long periods of time, the average output for the recorded periods becomes totally inaccurate.

So, without constantly checking multiple times a day that the App is doing what it’s meant to do, you will NEVER get a full and accurate recorded output.

The signal strength of the RF between Inverts and Modem is pretty good – I had a bit of an issue at first due to the distance between my Inverters and the Modem which was worsened by the tin roof on the house. This resulted in some of the Inverters showing as failed because the Modem could not connect to the Inverters – fiddling around with the antenna position resolved the issue.

I use the WVC-600 Inverters which have two panel inputs. Other Inverters like the WVC-1200 have four inputs for four panels.
The KDM Software can’t monitor individual Panels (individual inputs on each Inverter) – only the collective output of each Inverter. If one panel is disconnected (or fails), the overall output of the Inverter drops and there is no way (using the Software) to identify which of the two panels it is (or whether the actual Inverter input is at fault).

In summary, the KDM System is a good (but rudimentary) tool for inspecting the health of your solar array and identifying the proximity of the failure up to the number of panels connecting to each Inverter. The average output recorded (not generated) of your array can be severely affected when the Modem/Software gets a little confused (which is quite often).
I did have a play with setting up a Cloud Account on the KDM Website to see what the new generation of KDM WiFi (Wireless) Modems could do. I was really disappointed in the English translation of the Website and difficulty of use – but the new generation seems to be in its infancy and I may revisit and upgrade the WVC Inverters in future to play with.

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  FC-7688 Alarm Not Keeping Date/Time
Posted by: admin - 02-01-2019, 04:35 PM - Forum: Home Automation - Replies (1)

I have an FC-7688 Alarm that does not keep the programmed Date/Time and, after a few seconds, reverts back to default Date/Time after being programmed either via the Web Interface or the Control Panel.

The Date/Time is set and Saved as follows:

After a few seconds the Date/Time reverts back to factory default:

The correct Date/Time is displayed on the Control Panel too but also (after a few seconds) reverts back to the factory default time.

I suspect that it has something to do with the GSM overriding the Date/Time (I am not using GSM or have a SIM Card installed)?

Web version is: V0.003
Hardware Version is: V0.004
Software Version is: V0.017 SIA_TCP May 5 2018 09:20:41

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  Hyper-V Generation 2 VM - No UEFI-compatible file system was found.
Posted by: admin - 13-12-2018, 03:42 PM - Forum: Virtualisation (Hyper-V and VMware) - No Replies

Once you have met all the requirements for a Generation 2 Hyper-V Virtual Machine (64-bit Guest OS and OS that is on the supported list etc.) you may encounter the following error when trying to boot the VM from your ISO:

SCSI DVD     (0,1)       No UEFI-compatible file system was found.


Solution: Make sure that the ISO you are installing/booting from is NOT located on a URL or the Folder it is located in is NOT Shared.
Bizarre but true!

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  Windows 10 Sleep and Monitor Wakeup Problems
Posted by: admin - 12-12-2018, 02:16 PM - Forum: General Discussions - No Replies

You are no doubt reading this because your monitor/s don’t wake up properly after your PC enters Sleep mode or tries to come out of “Turn off Display Mode” (Turn off Display after a set period of time).

You can either disable Sleep Mode entirely or, if that is not an option for you, set advanced Power Options as follows:

Open “Power Options” and select “Change Plan Settings” then “Change Advanced Power Settings”.
Under “PCI Express” set “Link State Power Management” to “Off” – this is the main culprit.

You may also want to turn off (Disable) “USB selective suspended setting” if you find that the USB Mouse or Keyboard doesn’t respond to input.

While everyone is in favour of saving power, extending the longevity of hardware or protecting your privacy when you are away from your PC, you will no doubt encounter issues with Windows 10 with either Sleep of “Turn off Monitor” Modes.

Personally, I choose never to put my PC to Sleep and rather prefer to Turn off the monitor after a pre-set time. My reasons are clear in that I have critical monitoring software installed that “stalls” when the PC enters Sleep Mode.

Figure out what will work for you – I mostly find that having both Sleep Mode and “Turn off Display” creates a headache when it comes to waking up my 3 monitors.

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  Using a Fanvil X6 Phone with Jabra 920 Headset
Posted by: admin - 22-11-2018, 04:32 PM - Forum: Fanvil - No Replies

Ensure that the Fanvil Phone has the most current Firmware.

Connect the Fanvil/VT EHS (Electronic Hook Switch) to the Jabra 920 Base as shown here:


Log into the Fanvil Phone and Enable the EHS as shown here.
Note: If you only have options for "Disable" and "Plantronics" then you need to upgrade the Firmware.


If you want both the Headset and the Phone to simultaneously ring then Disable "Ring From Headset".
If you Enable "Ring From Headset" then only the Headset will ring - this a personal choice.


Note: The Headset Button on the Phone does very little other than open a Line to the Headset for dialing out - a bit of a limiting factor with these Fanvil Phones and unlike the Yealink Series where the Headset Button toggles "everything" between Headset and Phone.

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  WVC Micro Inverters (KaiDeng) - My Review
Posted by: admin - 21-10-2018, 02:42 PM - Forum: Alternative Power - Solar, Wind & Hydro - No Replies

I always wanted to use Micro Inverters instead of my Central Inverter for many and obvious reasons.

1 – Micro Inverters adapt to the condition/output of individual Solar Panels – IE: if one Solar Panel in a (Series) String has shade or has failed, it does not drop the entire String’s output (the problem that I was faced with).
2- Micro Inverters (mounted underneath the Solar Panel) convert the Solar Panels DC Voltage to AC before transmitting to the destination (mostly “Tied” directly into to the Grid).
3- Micro Inverters can be monitored, identified and diagnosed individually providing that the Model chosen has WiFi ability. Very handy if one of the Inverters fail and you want to locate the Solar Panel it is connected to without removing your roof.
4-  Micro Inverters eliminate the horrendous loss of power that DC Voltage is famed for over longer cable runs. DC Voltages from Strings can be extremely dangerous and they can reach in excess of 500 Volts and suffer from corrosion (in the early years of inter-city transmission when DC current was used, the poles were frequently reversed to slow down the corrosion process).

This was realised during my transition from Central Inverter to Micro Inverters as blogged here: http://www.computersense.co.nz/forums/sh...hp?tid=243

The cost of Micro Inverters was (and in most cases, still is) prohibitively expensive for most small to medium sized installations. In many cases, it more than doubles the price per Solar Panel installed.

The cost of Micro Inverters was the determining factor when I installed my Solar 4 years ago and thus ended up with a Central Inverter instead (which did well but masked the obvious power loss I was experiencing without knowing).

Still being cost-conscious, I was determined to give Micro Inverters a go but I wasn’t going to “experiment” with high-cost “branded” Micro Inverters.

Enter the WVC Micro Inverters (the WVC-600 to be precise).

What other place to look for something to experiment with other than Alliexpress?
The WVC Inverters immediately took the spotlight based on “affordability” and I soon discovered that all other sites (eBay, Amazon and Alibaba) were selling these under different names like MarsRock, Supoele, Snaterm, Tricorpower, Jesudom, Shinny and Jasmint (to name only a few).

All these Micro Inverters are manufactured by Dongguan KaiDeng (KaiDeng Energy Technology).

There are mixed reviews on the Internet regarding these KaiDeng Micro Inverters – I soon discovered that the reviews were either made on older models (which did seem to be problematic and “out of box” failures were high) or by reviewers on drugs or don’t know how to handle electronic equipment (like breaking MC4 connectors and blaming it on the manufacturer).

What you get in the Box:
You get the Micro Inverter of course together with stainless bolts/nuts/washers for mounting to your Sting Rails and a heavy duty/high quality power cable (3x 4mm cores) for daisy-chaining two or more Inverters together.


I was immediately startled at the high-grade quality which seems lacking in most Chinese-made equipment.

Not deterred by negative reviews on "the Internet" and, after receiving these first batch of Micro Inverters for testing, I gingerly tested them one at a time with two 250W Solar Panels and to make sure each of them worked “out of the box” – they all worked flawlessly.

After temporarily installing all the Micro Inverters on one String (of six 250W Solar Panels) and running for 2-weeks I was astounded that I was generating an average extra in excess of 2KW per day for that period (even during some BLEEP and stormy weather)!

I didn't hesitate in permanently installing them at next opportunity.

Here they are installed:


I then spent the following weekends permanently wiring them into the Grid with appropriate new AC Cables and Breakers.

It feels so good to get rid of those bastard DC components and reap the benefit of reliable AC.
The last Solar Panel in this particular String gets shade in the late afternoon which used to collapsed the entire String for the last 2-3 hours of sunlight - no more of that crap.

Six weeks on and everything is "heaven" and I since received another eight WVC-600 Micro Inverters to convert the rest of my installation and get rid of the rest of the bastard DC Serial Stings.

In summary:
I am over-the-moon with these WVC Micro Inverters and highly recommend them - however, if you live in a "backward country", you may find that getting them certified for your installation a pain (or not possible - so I have read) but these Inverters meet 80% of the worlds countries safety standards "that count".
I did, at the same time, purchase the WVC Modem to monitor the individual WVC Micro Inverters which is a great aid in checking the health of each Inverter.
However, I thought it best to do a separate review on the WVC Modem and the KDM Software used to monitor the WVC Inverters here: http://www.computersense.co.nz/forums/sh...hp?tid=260

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  DC Solar Panel Strings - DANGER
Posted by: admin - 07-10-2018, 01:52 PM - Forum: Alternative Power - Solar, Wind & Hydro - No Replies

Today I starting installing Micro Inverters on six of my Solar Panels mounted on the garage roof.
These six Solar Panels were installed in March 2016 in a series string.


During the removal of the downlink connection (output of last Solar Panel to start of the string) the MC4 Connector disintegrated in my hand.


I was shocked at the condition but really not surprised – still, only 2.5 years producing power I was somewhat disappointed (knowing that I have another 16 Solar Panels on the house in a similar arrangement but with much higher DC voltages).
I DID notice considerable degradation of output during those years but I didn't think much of it as I was adding more strings in better orientation to the sun on the house.

This "corrosion" is typical of what happens with high voltage/current DC Current components and one reason to why your mains supply is AC and not DC.
Just take a look at the battery terminals of a car that have not been properly maintained.

AC is your friend - DC is dangerous and I am so glad that I invested on enough Micro Inverters to convert the rest of my installation.
I have learnt this lesson so that you don't have to.

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  Yealink YHS33 / W56H Headset Wiring Pinout
Posted by: admin - 21-09-2018, 04:06 PM - Forum: General Discussions - No Replies

The YHS33 Headset Pinout wiring is as follows:

RED - Speaker +
BLACK - Speaker -

GREEN - Mic +
YELLOW - Mic -

To connect to a W56H Handset you will need a 3.5mm 4-pole jack.
Image and pinout of jack coming soon...

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  Unable to start the Exchange Transport Service after removal of Trend MSA/SMEX
Posted by: admin - 18-08-2018, 02:58 PM - Forum: General Discussions - No Replies

The Exchange Transport Service will not start (or start then stop) after removing/uninstalling the Trend Messaging Security Agent (MSA/SMEX) from the Exchange Server.

Trend MSA (SMEX) installs a "hook" on the Exchange Transport mechanism which intercepts inbound Email for analysis.
When Trend MSA is uninstalled, the "hook" remains in place which either prevents the Exchange Transport Role from accepting inbound messages or preventing the Exchange Transport Service from starting.

The MSA "hook" needs to be manually removed with Exchange Management Shell.
To identify/verify if the "hook" is active run this Exchange PowerShell command:


If this "hook" is active it will show as follows:


To remove the MSA "hooks" run the following Exchange Management Shell commands and choose [A] to remove after each:

Uninstall-TransportAgent -Identity "ScanMail Routing Agent"
Uninstall-TransportAgent -Identity "ScanMail SMTP Receive Agent"


You should now be able to successfully start the Exchange Transport Service.

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  DrayTek Router with LDAP (Active Directory) for Dial-in Users
Posted by: admin - 25-07-2018, 03:21 PM - Forum: Networking - No Replies

Setting up a DrayTek Router with LDAP (Active Directory) for Dial-in Users.

1) Enable Remote Access VPN Service - for this example we are going to use L2TP as the VPN Service.
Under VPN and Remote Access, Remote Access Control tick to Enable L2TP VPN Service and click OK and reboot the Router.


2) Configure PPP General Setup
Under VPN and Remote Access, PPP General Setup set Dial-In PPP Authentication to PAP Only (this is a requirement for LDAP as explained in the note of the this screenshot).
Enable AD/LDAP, LDAP and adjust the DHCP scope if required for Remote Users.


3) Create a VPN IKE/IPsec Pre-Shared Key
Under VPN and Remote Access, IPsec General Setup enter your desired Pre-Shared Key that Users will use when setting up their VPN Connection on their Computers.


4) Setup Active Directory/LDAP for Users to authenticate with.
Under Applications, Active Directory/LDAP first configure the General Setup as follows:
Click to Enable and set the Bind Type to Regular Mode and enter the IP Address (Server Address) of your Active Directory Server - leave the default LDAP Port at 389.


The remaining steps are where many mistakes are often made.

The Regular DN and Regular Password is used to authenticate with your Active Directory Server and thus a Domain Administrator Account must be used (either existing or created specifically for this purpose).

For the correct Regular DN for your setup, open Active Directory Users and Computers.
In this example, we have color-coded things to make it easier.


For the above example, the correct Regular DN should look like this:


Note that we have used the account Administrator for this purpose and thus the Password for the Administrator Account will be the Regular Password.

If you are using SBS Server, your Regular DN would look something like this:

cn=My Admin,ou=SBSUsers,ou=Users,ou=MyBusiness,dc=mydomain,dc=local
Note that the CN name "My Admin" is the "displayed" name and not the actual account name.

5) Setup Active Directory/LDAP Profile
The Active Directory/LDAP Profile will connect your selected OU (Folder) containing your User Accounts for Remote Access.
Under Applications, Active Directory/LDAP select the Active Directory/LDAP Profiles tab.
Click to open the properties of the first available Index (in this case 1).


Enter a preferred Name for this Profile (IE: LDAP as per this example) and under Common Name Identifier enter cn.
Next click on the search icon (circled) - if all is good at this point you will see a pop-up window of Active Directory items.

Click on the Container or Organizational Unit where your Users are located (IE: in this example it will be CN=Users) and the field AD/LDAP Distinguished Name will automatically be filled for you - click OK. You should now see the correct Base Distinguished Name filled in.


The Group Distinguished Name is used for optional filtering as described here by DrayTek:
Group Distinguished Name is used while administrator wants to do an additional filtering. While both Base DN and Group DN are configured, the user account must be available in both path, otherwise, it cannot pass the authentication.

Your completed Profile will now look like this:


Client Computer Setup:

1) Add the following 2 registry entries to the computer if running Windows 7 or Windows 10

DWORD Key: AllowL2TPWeakCrypto
Value: 1

DWORD Key: AssumeUDPEncapsulationContextOnSendRule
Value: 2

2) Setup the VPN connection parameters as follows:


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