I am starting to look at switching to solar power as much as I can in the next few months and was hoping somebody can give me some advice.
I am thinking of starting with a simple EV tube solar panel setup for one of my two 150l geysers. Because I am planing to go PV solar at a later stage I want to reserve all the north face roofing area for the PV panels. This then leaves either the east facing or west facing roof for the EV tubes. One installer said the panel must go on the west side but I would prefer east for the following reason/assumption - once I have a PV system most of the electricity usage from the panels will be in the morning due to recharging the batteries, washing clothes, ironing, etc and in the afternoon the PV panels will probably have spare capacity that can now be used to assist with the geyser heating. With west facing EV tubes the geyser will not get any heat in the morning unless I want to use Eskom power which I would obviously prefer not to.
Are there any flaws in my reasoning with installing the EV tubes on east facing roof or should I rather listen to the installer and use the west facing roof?
Also would it be a good idea to replace the current element with a lower rated one so that if I do heat they geyser with PV electricity I have more 'spare' power available for other tasks even though the water will take longer to heat.
Thanks for you advice.