18650

My 2c worth split the 16 up and sell them in 4 panels at a time then i am sure you will sell them the problem not everybody needs 16 panels and makes the collection also easier. So R 6750 for 4 panels.

I am running a 25 Amp SONOFF from Communica for R750 and love it,
it gives me monthly reports based on my daily consumption for last 3 months, I have set it to only switch on in the mornings before I shower for 45 minutes, so far very happy with the results. Ignore the cost, I just entered R2.90 per unit and I know that is higer than what I am actually billed for.
R750 from Communica
https://www.communica.co.za/products/sonoff-energy-monitor-pow-r3?variant=39438047150153
Here you can see in April I consumed 42 units and there was a spike on the 16th coz I manually overrode the geyser to be on longer as I had 3 loads of dishes to do 😆
 

Thank you for the confirmation/info BGb as this was a question 🙂.
Re the positioning, I considered placing them horizontally so to minimise the effect of the shade at the bottom, but the roof is not long enough for when I eventaully get to install my full compliment of panels (16). I managed to fit the initial 10 and although the shade (from the chimney) does impact me, it is not causing me to much of an issue due to the time of the day - it will also only be really evident in Winter months as the sun seams to be lower and it moves over the panels in the afternoon from right to left. As mentioned, I was limited by what I can do as I still need to add the last 6 x panels (3 x top & 3 x bottom) in the gap where the rails are still protruding which takes up all the roof space I had left.
After installing the current 10x375w Canadian Mono panels (3750w), I have been able to generate between 2000-3000w on an average May day (with clear skies) which is the start of winter in CPT and from what I have been told, this is relatively good/ok. I am also fortunate that my afternoon consumption is relatively small
So far so good 😀 

I am really new at this solar stuff and having installed a Sunsynk 5.5kw inverter about a month ago I thought it would be a good idea to add some solar panels. Being a bit of a handyman, and always looking for new projects around my house, I thought this would be a breeze. 
Needless to say, it was not as easy as I thought and being a absolute newbie, the biggest problem I faced was where to find sound advice and information.
From the actual installation of the roof hooks and rails to what I would have thought was simple stuff like the distance between rook hooks (along the length of the rail) and and how far apart (top to bottom) the rails should be etc. was a nightmare trying to find the correct imformation. I visited so many stores and tried to search Youtube as well as this forum. Someone also told me that I must I also cut the roof tiles and I remember telling myself - what on earth is this bloke talking about.
Anyway, with the little bit of information that I could find, I went about installing the roof hooks and rails and thought I would share what I did - perhaps someone else may find it useful (or possibly others may be able to tell me if I did something wrong).
I was advised that the roof hooks have to be between 1m and 1.5m between each hook. Considering your roof rafters are about 750mm-800mm apart, I suppose the 1.5m width seams accurate with a hook on every 2nd rafter. Someone did tell me you need a hook on every rafter (every 800mm), but the cost of doing it this way would be huge if you consider a roof hook costs between R150-R200 per hook. (A 6m lenth rail would then require 7-8 hooks totaling between R1050 and R1600 just for the roof Hooks - then add a 6m rail and the total could easily be around R2K to fit each rail which just seams over the top. So I went with 5 hooks over a 5.5m length with a gap between 1m and 1.5m. I also added in an extra hook on 2 of the rails just because it made me feel better 🙂 . Below is the final installation of the rails.
I hope someone will find this info useful or perhaps if I did something wrong someone could tell me before I fit the actual panels.

Then that is a damn good deal you have there for under 5 grand a battery