devank1

Use a 1p or 2p contactor rather.
https://www.em.co.za/ESC225
https://www.acdc.co.za/products/20a-2p-n-o-contactor-230v-din?variant=30482240140
https://www.robotics.org.za/CT1-25
https://britelighting.co.za/products/20a-modular-din-rail-contactor-2-pole

AFAIK both these inverter should be able to provide 2x max for starting fridge and freezer while having the PC on. I have fridge and freezer and surely there must have been times that they started at the same moment. They have never given the low battery warning alarm04 which is a few % away from cut out. Yes my micro has brought this alarm up but inverter has never tripped apart from one day when I tested at what level of power during bypass it does trip. I have the 3kW Axpert clone. During our 4.5h LS today my 1.5kW heat pump was on as well as the fridge and chest freezer. With PV support no problem or alarm04. 

Hi @devank1
My opinion is that peoples requirements are all different and as long as you are aware of the differences between the inverters you can make an educated choice between them as to what suites your requirements/budget best. 
Unfortunately the term Hybrid is widely used for marketing and the meaning changes depending on who you are speaking to.
 As far as I am aware, the Growatt is not a true Hybrid Inverter, in most people's books anyway, as it does not sync with the grid and as such does not have the ability to back feed into the grid. It is essentially an off-grid inverter than can be powered by grid power, some people call this a "Hybrid" as it can "blend" in power from the grid to run the inverter.   You pay an efficiency penalty on power from the grid as the inverter is using it to power the inverter to generate the power to power the load (hope that makes sense).
 
In my opinion, a true hybrid inverter syncs is AC frequency to the grid and can feed back power into the grid if required when connected to the grid. It can also run in Off-Grid islanding mode where it will generate it's own grid-frequency and does not feed any power back. Switching from grid-island mode is pretty much instantaneous and switching back to the grid usually involves a delay so as to allow the inverter to sync the loads back to the grid before reconnecting.  
Power coming in from the grid powers the loads directly and can be blended with power coming from the inverter PV Panels and Battery, their is no efficiency price to pay as the grid power is not powering the inverter. 
The other advantage of the true Hybrid inverters is that you can have a load larger than the maximum inverter power. The Sunsync 8kw for example will allow you run a load up to 12kw, maximum it can power is 8kw and it will feed in the rest from the grid. 
 
Exceeding the maximum load on the Growatt inverter will result in either the full load being switched to the grid or the inverter tripping out. There is no option to "blend" in the power available from the inverter as the inverter does not sync to the grid
 I hope that clears things up for you. 
Please be aware that I am not saying that the Growatt is not a good inverter, just that it is important to know the limitations of that type of system design. 
 
 

If you can find a Kodak or Axpert King 3kVA, that might give you the functionality you're looking for. Can't speak for reliability. For your intended usage I'd double-check the surge capacity of the inverter and battery, to see if it can deliver the power of the fridge and freezer compressors co-incidentally starting up at the same time, on top of running a small home office. Worst case that could trip your power every so often.