ABDurbs

Morning
33 x 25.5 x 10.5 cm
 

Morning thanks for the feedback. Do you possibly have the L x W x H dimensions of the inverter itself please. I can't seem to google the user manual or dimensions anywhere. TIA

I have  the same one works great . You must have got a dud . 
Just get it replaced it's worth the trouble getting it replaced 

I have a few of these from sinetechstore.
I got some 15W and some 40W.
The 15W marketing brightness is more like 5W and the 40W marketing brightness more like a 10W.
The good news is that they are over 3 years old and still working and run all night long.

I have 5 Installed at my house. They are not as bright as the normal Led flood lights so quite disappointed with my 30W one's. One has semi stopped working after 3 years it's on during the day and off at night. They do last the whole night but I notice they get dimmer as the night goes on if they had a good charge during the day.
 
 
 

Great, and I hope it serves you well.👍 
As far as support is concerned, stay connected on this forum. This inverter, albeit clone, is a derivative of the Voltronic design, and as such you may find people here knowing, willing and able to help. 

@Gary Smith Mercedes drivers will always look down on Hyundai / VW drivers....

At R 3250 I presume you refer to the Takealot price.  Note that their price went up, now R 3700.  Judging by the pictures, this is an older model.  The one @ABDurbs shows in his picture seems to be the current model.  The new model is advertised for R3900 (Takealot).  I have no idea what the difference between these models is.  From Takealot comments, it seems that the older model might not have a communication port.

I have no personal experience of these, but saw that Fivestar makes many models right up to 8.5 and even 10KVA units.  If someone builds motorbikes, then I would trust them to be able to build a scooter as well.

My recommendation for anyone that is not a Mercedes driver, would be to try and run their inverters at a nominal power of 50% of rating.  @ABDurbs has the right idea.  In other words, don't buy this 1KW inverter and hook it up to your microwave to see what it can do.  Chances are, it will run the microwave, but you might have a pre-mature death within a few weeks or months.

I would take my chance with a Fivestar Axpert clone before I would spend similar money on these Mecer 720W/1200VA inverters.  Main reason is that the Fivestar is a proper Sinewave inverter and the (non-Axpert) Mecer is not.  The Fivestar also has the PWM solar charger, if ever you would want to connect panels.

I am very negative about future battery prices.  Lithium is in short supply.  However, inverters I would expect to come down in price.  Why?  E-cars.  Even the smallest of vehicles has a 60KW power-plant and most are at least 120KW.  The mass adoption should drive power electronics down.  I also think the inverter tech will move substantially over the next few years.  Industry has a habit to bring out advancements that makes the old obsolete.  For most of us, Eskom has forced our hand into this tech and we need to go through a learning-curve.  I think it is foolish to get your driver-license with a shiny new Merc.  Yes, a cheap Axpert inverter might pack up.  You will likely have paid LESS for it than the repair costs for guys with a Merc, in the event of them having a breakdown.

The SA market for solar systems is currently terrible.  The shortage causes everyone that has stock to inflate prices.  In a certain sense, all Axpert inverters are clones.  Is it worth to pay double for a Kodak or RCT?  I think if you are a fine-tuner, and want to pull daily stats, etc. then the cheap clones might disappoint due to (likely) software/firmware limitations.  The better names might have a bit more meaty MOSFETS and other high power components and thus be more capable to run for extended periods at their  design ratings.  Keep the load well below the specified rating and chances are you will get by just fine.

I have 4 mecer ups's (all modified sinewave - 3000va, 2000va, 1000va, 800va ) and have been running 3 of them for almost 6 years now with zero damage to any of my electronics devices, pc's, routers, tv's etc.
Maybe I have just been lucky 😉

THD will not influence any of the devices mentioned - they all have SMPSs, so your modified sine gets converted to DC in the first step, and then it does not matter. Pretty much all affordable consumer UPSs for computers are modified sine and they work perfectly.