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Sebastian Annies

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  1. I'm planning to install a system with a 4KW/h battery, 5KW Deye inverter and 3KWp solar. The batteries are primarily there to cope with load shedding, not necessarily to keep me from using Eskom power. (It's a summer home therefore only some solar cells) I will have excess power and I thought about dumping it into hot water. Plan: Two 150l geysers. The first geyser runs as an essential load with the regular heating element (3KW) and temperature set to 40°C (backup). The second geyser is connected to the smartload circuit and temperature is set to 90°C with a smaller heating element. Each heating element is also connected to a contactor and whenever active it also starts the circulation pump. In order to accidentally not hurt ourselves I'll use a thermostatic mixing valve to limit the output temp to 50°C. 2 times 150l and 50°C temperature difference equals 17KW of energy storage. Am I missing something? Does is make sense?
  2. I got a Axpert 5KVA + 4x100Ah and no PV (for the moment only load shedding backup). My supply is 60A TN−C−S. It looks to me as if I don't have an earthing spike. Earth is bonded to Eskom's neutral right before the meter. I'm using a changeover switch to disconnect Eskom and use the inverter. I understood that I have to bond the inverter's neutral to earth when I switch to inverter during load shedding. But where would I get 'earth'? CT seems to require a complete disconnect before I connect the inverter but typically one would - at the same time - create a connection to Eskom's neutral. So 3 questions: Can I trust Eskom's neutral to be bond to earth during loadshedding? Can I used Eskom's neutral/earth to bond my inverter's neutral? Do I need my own earthing spike?
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