MrMeeseeks86

You can consider integrated lithium inverters and batteries. Whatever solution you pick, it probably won't scale. With the integrated solutions the battery management should be decent.

I would rather go for the 1kw with 2 x lithiums from the start. Yes the 3KVA with Gel can be upgraded later to lithium but don't expect even with your lower load for the Gels to last longer than 12-18 months. I try not to use more than the 60% capacity of the inverter as not to work components very hard. 
The Ecoflow are great units but if you look at the Ecoflow River at R14 000 it only has 576wh capacity. This on a desktop at 200W and your TV at 265W you will not be able to even use them for 1.5hrs. They are great for use when camping where weight and space is at a premium. 
Also most are not made for charging 24/7 in order to use them as a UPS. Good point to make very sure of the load that will be used during the LS and decide on the actual storage required. Observe the 50% rule when using lead acid batteries. This means 600Wh per 12V 100Ah battery for discharge per LS cycle. Also lead acid will not recharge to 100% capacity before the next LS event. Lithium on the other hand might well but depends on the charging power. 
24V always better than 12V due to lower amps being provided by the 2 batteries in series. 
I would not go for a modified sine. The pure sine you can always use in case it is needed for a fridge during a power failure as opposed to just a LS cycle when it is not needed to keep on. We never know when the power cannot be restored after LS due to equipment failures. We will be seeing a lot about this as equipment is not designed for the current regular daily switching. 
Just my 2c.

My error! I just looked at their spec sheet, and they say that the DELTA model (1.2kw) can be recharged from grid in 1.6 hours. So not so shabby, and certainly you can recharge between load sheds.

But they also say that the battery life is 800 cycles - which isn't so hot.

I'd also have questions about where new batteries can be bought for an ecoflow, especially given that they are effectively declaring a 2 year battery life. 

As regards your TV - work on 265W. With all appliances if they gave a range of power consumed, take the highest. If that's what they use, you're covered. If they use less then you have a safety net.