frivan

Falling energy prices, free at times... amazing what can be done if Eskom wasn't Eskom:

In my mind a gas heater for this purpose is better: middle winter morning heating.

This only applies to men. Women are immune to hot water.

This only applies to men. Women are immune to hot water.

The manual provides a good starting point:

Why consider hybrid inverters if you don't need them?

Why consider hybrid inverters if you don't need them?

I don't think the government cares about food security. They, including Eskom, will continue with their policies until the balance sheet can't go more negative... Then the poor will suffer most.

Unless the inverter is disconnected from the municipality, or you only use a 48V charger, you will have to engage with the municipality... And probably you may have to register off grid inverters also.

Her is a plan:
1 Connect 4 solar panels to your geyser
2 Run a 5kW Deye in grid tie mode
3 Install smart switches and controllers
4 Add four more solar panels
5 Buy a Shoto 5kWh battery
6 Add 8 solar panels
7 Add one more 5kW Deye in parallel
8 Add 2 more 5kWh batteries
Repeat steps 6 to 8 until you have taken over the world.

AI AI. Other than magic, if the Elon uses straight DC from the panels, the follow formula should apply:
Pdc = Pgeyser x ( Vstring / 230 )²

Well, then you could use a couple of diodes instead of the Elon.

I am not sure how the Elon converts DC to AC but I would guess it makes a modified sine wave. If this is the case, Isc is not as important as Imp and the most important is maximising Vmp. Your geyser element size will probably determine the current draw.
Well done.

If you think the professionals are expensive, wait till you see what the amateurs cost.

It's not a must, but it is nice to have an inverter that responds to frequency shift. I also prefer not having the electronics sitting between the roof and solar panels.

Most definitely you can do it. Will you get a CoC (electric and gas) for it, not sure. Will it blow up, probably only if you go from 0 to 75 degrees inlet water quickly.
I don't have the manual, but check if there are high inlet temperature trips. Otherwise you must devise an electric cut-out for the gas heater if the electric geyser temperature is too high.

I like it. Was wondering if a couple of 50mm holes through the wall will work for the external box... But screw it, dig up the floor!

I will give you the short version:
The more warm water you use, the more energy you use. The warmer the water in the geyser, the more losses you add to your system. Controlling time is a poor way of controlling hot water temperature and quantity in the geyser. Geyserwise and some smart thermostats measure water temperature inside the geyser.
In your situation, you should consider what you can hide from the landlord. I suggest installing an Elon thermostat:
ELON SMART WATER THERMOSTAT https://leroymerlin.co.za/elon-smart-water-thermostat-81504247?sfdr_ptcid=32806_617_759128507&sfdr_hash=7335bbd6c20f0137a8f17f884afc1515&gad_source=1&gad_campaignid=17335597113&gclid=CjwKCAjw0o3SBhBVEiwAh28-jSaEDa18r5LEgEY0IkANeWI_WTyUOj0ZvL4DGkbWcgE9jZvnfXWOXhoCy1UQAvD_BwE

Add two more panels on the eastern side of the smaller roofs, try vertical panels, drill holes in the trees and pour in diesel... Lots of options.

My solar system has an IRR around 23%. I added a second battery which has an IRR of about 18%. However, winter in Cape Town is not the period when the equipment performs.
Any IRR above inflation is good but the higher the IRR, the more pain for Eskom. A solar panel can theoretically give 200% IRR.
This father's day, spoil someone you love with the gift that keeps giving: a PV panel.

If you add a changeover switch (and disconnect the Solis), why isn't it a long term solution?

A cheap system could set their 0% where others call it 20%. But then you would see poor energy per weight figures.
Sungrow is a reputable player in the grid scale environment, I would buy their equipment.

Once you invest in solar, you want to maximise use of the solar system under normal conditions: use it for the geyser, cooking, etc. I like induction plates because they are very responsive.
When the grid is out, you want to minimise draining batteries and then gas heating comes in handy. I use a Cadac cylinder if needed. I doubt if gas heating beats electrical heating on a price basis.

Once you invest in solar, you want to maximise use of the solar system under normal conditions: use it for the geyser, cooking, etc. I like induction plates because they are very responsive.
When the grid is out, you want to minimise draining batteries and then gas heating comes in handy. I use a Cadac cylinder if needed. I doubt if gas heating beats electrical heating on a price basis.

I am using the R3 to switch the old 20A relay.
The Geyserwise main unit would probably be installed at the geyser. But running a small wire for the display is not so bad. Financially the Geyserwise and Geyserwala is not better than my solution, specifically because I had some of the components already.