Dairyfarmer
Executive Member
Some ideas on what I should set the Overload Protection System thresholds to.
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Sonoff POW2 OPS Threshold Values
- Thread starter Dairyfarmer
- Start date
Goobie
Expert Member
What device will be attached to it? If it is something like a pump then the startup current will easily double the rated value
Dairyfarmer
Executive Member
I'm putting one on my geyser.
I have another that i want to add in before my 3kva inverter. I isolated my house into 2. All that are not on inverter (laundry, stove, geyser,...) are on one phase with their own isolator and EL. Another of the phases is running to my inverter which outputs through its own isolator and EL.
The idea is that I can remotely monitor the utility side of the inverter. At a later stage I plan to have one on the output side of the inverter too. This way I can monitor future solar and battery usage verses utility usage.
I have another that i want to add in before my 3kva inverter. I isolated my house into 2. All that are not on inverter (laundry, stove, geyser,...) are on one phase with their own isolator and EL. Another of the phases is running to my inverter which outputs through its own isolator and EL.
The idea is that I can remotely monitor the utility side of the inverter. At a later stage I plan to have one on the output side of the inverter too. This way I can monitor future solar and battery usage verses utility usage.
TedLasso
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I use POW R2 for geysers. They are using Tasmota firmware. I have not set anything specific like this for them and thye work well (except for Eskom issues recently - see my previous posts in these forums). Geysers are 3Kw and 2Kw. I wonder if we can even set these for them with Tasmota firmware? Perhaps could be useful.
I've done the below automation as an extra failsafe. When current goes over 13 Amps it will show a notification on HomeAssistant, it will send me a notification and also switch off the geyser. My automation below.
- id: geyser_overload
alias: 'GEYSER OVERLOAD'
trigger:
- platform: numeric_state
entity_id: sensor.geyser_current
above: 13
action:
- service: persistent_notification.create
data:
title: 'GEYSER OVERLOAD'
message: 'GEYSER OVERLOAD'
notification_id: geyseroverload
- service: notify.samsungandroid
data_template:
message: THE GEYSER OVERLOADED
- service: switch.turn_off
entity_id: switch.geyser
Dairyfarmer
Executive Member
Got some stats from my geyser last night. When running flat out it's pulling over 3.4Kw @ 15.8A. In 18 hours it has used 10.32kWh.
ChuckNorris
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Maybe not run a geyser on the sonoff pow R2. Seen a few that did not make it.
Below pictures is of a pow R2 on a 2kw/h element geyser
Below pictures is of a pow R2 on a 2kw/h element geyser
ThatGuy_ZA
Senior Member
You are very lucky that there wasn't more damage. Communica have a big notice saying something to the effect of "do not use with Geysers" on their website.
ChuckNorris
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Luckily that was not mine. Guy on powerforum that posted it.
Agree, I don't trust them past 60% of rated capacity.
Dairyfarmer
Executive Member
Oh crap. Guess I'll be removing mine this evening. Might just add a single phase contactor and replace the button with a Sonoff. That way there will be very little wattage running through it. All the load will run through the contactor.
SauRoNZA
Honorary Master
One has to wonder if the wire gauge used was correct and also how it was used with the geyser.
Staying on permanently it turning on and off regularly etc.
Any idea how long he used it?
ChuckNorris
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No, I'll check if I can see something else.
Someone noted that the temp in the roof was a contributing factor and another guy said that the quick release spring connectors might also be a problem. As some of the hard house wire does not work that good with them
Someone noted that the temp in the roof was a contributing factor and another guy said that the quick release spring connectors might also be a problem. As some of the hard house wire does not work that good with them
Dairyfarmer
Executive Member
We see a lot of burned wires at our pump houses. 99% of the time it's a lose wire. Even happens on the Eskom connections.
Removed POW over lunch time. Going to relocate it to outside next to the geyser. All wire to the geyser is 16A.
Removed POW over lunch time. Going to relocate it to outside next to the geyser. All wire to the geyser is 16A.
Last edited:
Yeah, we've yet to see this happen anywhere else (in the world). The original POW was problematic, but the R2 gives few issues.
Additionally these devices are successfully tested in accredited labs up to the rating.
SauRoNZA
Honorary Master
Yeah it’s also quite evident the live wire was burning not so much the Sonoff unit itself.
It's most likely because some geysers are rated at 4kW.
Geysers have a resistive load and should not exceed the 15A rating. Additionally the POW R2 has overload protection - unless of course the short occurs on the wiring before the device.
Google this type of damage on the POW R2 (not the original) and you won't find many (if any) results.
TedLasso
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Having had run my pow r2 on 3kw and 2kw geysers , for over 12 months now, thankfully has never even shown a hint of burnout/overload. I also have them mounted in ip65 boxes next to geyser. Hopefully provides another level of protection should they ever burn ... shelleys would be better though I think?
Ooopsie.