I've got 2 x 150L geysers (Tecron 200KPA and Kwikot 600KPA)

I'd like to consider water heating options for these geysers to save costs on electricity as my Tecron consumes 9-10 Kwh per day. Which would be the most cost effective way to go about doing this.

Not sure if this changes anything but I've got a 5KVA LuxPower Inverter, 5KVA Shoto Battery and 8 x 410 Solar Panels.

I was thinking of Starting with Geyserwise and doing it in Stages (Geyserwise Module First, Geyserwise Element Second and then either adding the MPPT or connecting it to my Inverter)

If there are any other suggestions I'd really appreciate.

By installing the Gesyerwise with Tuya module, I gained valuable insights into my geyser's activity. The solar geyser isn't working because the anti-freeze needs to be replaced. But I've adjusted it to use the least amount of grid power when there's no sunshine.

Now my solar panels heat up the geyser to 65C during the day and Eskom 45C at night. Yeah, yeah, I hear the mother Grundies going on about legionnaires diseas, but a geyser cools down to lower than that multiple times in the day.

My geyser is on non-essential and my Deye inverter sends extra power to it. Electricity use is down enough to make a difference. Your mileage will differ, but we are saving R500 plus a month already.

* 4500W panels

* 8Kva Deye Inverter

* BX51100 battery 5Kw

 

What I have done installed a Sonoff timer for my 150L geyser, I replaced the 3KW element with a 2KW element and I have a schedule to turn the geyser on from 10.30am to 2.30pm as this is when I have peak PV generation and therefore I heat my water via the panels.

 

The 2KW element helps keep within the 5KW limit of the inverter and helps ensure I use as much of the PV as possible to heat the water and less from grid / battery.

 

EDIT: I have my theromostat set to max (70C) and there is a geyser blanket and this ensure that water remains hot enough to have a nice shower the next morning.

Edited September 7, 20232 yr by PsyCLown

Perfect, thanks so much. So I'll start with Smart Geyserwise and then add the element later, would the Geyserwise unit on it's own make a difference due to setting the heat lower?

Not sure if I'll be able to add both 2kw elements to the geyser though, so should I do one to the inverter and one with the MPPT and it's own panels or rather consider upgrading the Inverter to an 8Kw at a later stage?