If your geyser is a main issue, why don't you exchange it also with gas? We have a Polona geyser that is installed outside and is highly recommended at the coast. We do up to 5 months on a 19 kg bottle! (R700). Amazing!
No load shedding for us. Using a 8.5 kw Deye-Sunsynk invertor, 10 x 540W...