I'm in the industry. I apologise if the following is a bit disjointed - its midnight.
1) If you really want a portable system - These guys seem to have some decent yet not too expensive solutions:
Compact Power Stations Archives - Energy Independence - no I'm not affiliated in any way.
2) The above is based on more of a home system DIY'ed into a trolley. ( These systems should be integrated into your house but made into a trolley form factor).
3) I would say the above is far superior in terms of longevity, upgradability and general usefulness.
Quick Comparison:
Since it was mentioned above here is a River pro:
EcoFlow RIVER Pro Portable Power Station - R15k
Capacity: 0.72kWh * 0.8 (Depth of Discharge allowed = .576kWh (800 cycles lifetime)
Say you get 2 bouts of load shedding a day. You will be up to 730 cycles in one year.
Standard output = 600W
Basically if you draw a continuous 576 W it will only last an hour.
Nice neat box but overpriced for what it is. If you don't go camping every 5 minutes - get a more permanent solution.
In perspective: You do get an inverter built in but you are effectively paying R 30k incl. VAT. per kWh = Holy shit.
48V
LiFePO4 batteries currently work out to about R6.5k per kWh incl. VAT.
Yes, you have to buy an inverter and other odds and ends.
By the time you are finished with all relevant hardware and installation you will probably work out to R15-20k per kWh backup power integrated into your house.
My opinion of the entire ecoflow, rentech etc. "power stations" is that they have their place, they are overpriced and at best a stopgap measure.
Even the cheapest system form the above
link is better in every single way (besides for form factor). Build one yourself - I'm not responsible for death or injury if you don't know what you are doing.
If you have the money, bite the bullet, do a permanent 48V house solution. Expand it with solar later. Pays for itself after that - if done correctly. Load shedding is not going to go away anytime soon.
Drop me a DM if you want to chat further.