Loadshedding is starting to irritate me as well. Every time I reconnect I have to buy 2.5kWx1/6h =~0.4kWh (10 min to maximum capacity, taking 5kW as capacity) for my inverter to reach capacity again. With three loadshedding slots per day, that is ~1.2kWh.
I thought that I would be able to get around that by letting my big loads only come online 10 minutes after loadshedding, but it seems like the ramp rate is a maximum and the inverter will only start ramping if there is a demand to ramp, so effectively I have to buy power to let the inverter ramp?