I'd like to know what would be the best way to get better savings out of my GeyserWise Installation

I've got 2 x 150L Geysers and each one has a Geyserwise System with 2 x 460W Panels.

2 x 150L Geysers (1 x 600kpa Kwikot and 1 x 200kpa Tecron)

2 x GeyserWise System with 2000W PTC

4 x 460W PV Panels

First Geyser is the main house geyser which is used more regularly

Then the second Geyser which isn't used as often

Does anyone have ideas on how to improve savings? (I'm aware the system isn't as effective in Winter but would like to know what improvements I can make)

Edited June 20, 20251 yr by Mikhail Hathey
Update

A few days ago

Main Geyser

Secondary Geyser

Edited June 20, 20251 yr by Mikhail Hathey

Mikhail, I notice you heat your geysers early mornings (looks like 03:00 to 06:00). This would obviously not be able to draw any power from your PV panels if you do not also have a battery "bank".

Most logical improvement would be to either change the early morning start time to only start once the sun is shining nicely (say 08:00), or to add a battery of sufficient capacity if that would be possible (don't know the voltages etc. of the panels...). The latter would be quite expensive, but will probably be the most cost effective in the long run, if the PV panels would be capable of charging them. A third, and IMHO better, opinion would be to upgrade to a proper panels + inverter + battery system, and then just run the geysers as part of your normal load, with the Geyserwise just used as timers and temperature monitors.

Would be interested in hearing other's opinions, though.

58 minutes ago, HennieL said:

Mikhail, I notice you heat your geysers early mornings (looks like 03:00 to 06:00). This would obviously not be able to draw any power from your PV panels if you do not also have a battery "bank".

Most logical improvement would be to either change the early morning start time to only start once the sun is shining nicely (say 08:00), or to add a battery of sufficient capacity if that would be possible (don't know the voltages etc. of the panels...). The latter would be quite expensive, but will probably be the most cost effective in the long run, if the PV panels would be capable of charging them. A third, and IMHO better, opinion would be to upgrade to a proper panels + inverter + battery system, and then just run the geysers as part of your normal load, with the Geyserwise just used as timers and temperature monitors.

Would be interested in hearing other's opinions, though.

Thank you very much Hennie, we set it like that to make sure the Geysers are warm for the morning but I agree that I should reduce it to maybe like an hour or two instead of 3 hours and see what the improvement is.

I do have an Inverter and Battery Setup currently for the rest of the load, that's how I noticed the power load being mainly on the Geysers.

Edited June 20, 20251 yr by Mikhail Hathey

2 hours ago, Mikhail Hathey said:

I do have an Inverter and Battery Setup currently for the rest of the load, that's how I noticed the power load being mainly on the Geysers.

I initially considered doing it like you have, but ultimately just added a timer to switch the geyser on and off, and run it as part of my normal house load. This way, I use my battery to heat the geyser for an hour every morning before sunrise, and power generated by my PV panels to directly drive the geyser during the day (after the batteries have been fully recharged).

What size inverter/battery/panels do you have? Would it be possible for you to do the same?

On 2025/06/20 at 8:48 PM, HennieL said:

I initially considered doing it like you have, but ultimately just added a timer to switch the geyser on and off, and run it as part of my normal house load. This way, I use my battery to heat the geyser for an hour every morning before sunrise, and power generated by my PV panels to directly drive the geyser during the day (after the batteries have been fully recharged).

What size inverter/battery/panels do you have? Would it be possible for you to do the same?

I've got a 5Kva Deye Inverter, 10kva Shoto Batteries (5kva x 2) and 8 x 410W Solar Panels