can I run two 20w extractor fans off of this smart Fused spur?

[PB97]

I'm going to put two 20w extractor fans into a dry attic space to ventilate it as it gets very hot in summer due to all of the insulation that the government forced us to install for the winter.

I'm planning to connect them to a smart Fused spur so that I can turn it on and off remotely via home assistant and a wireless temperature sensor.

can I run them both off of a single spur, or do need two. the math says that the base load is well within the limits, but us there some other reason I'd need to seperate them.

The spur is

CMA30651 - 13A Zigbee Smart Switched FCU

CMA30651 - 13A Zigbee Smart Switched FCU

scolmore.com

the extractor fans are

Specification
Brand	Manrose​
Building Regulations	Will comply with Building Regulation Part F if installed in accordance with the manufacturer's instructions and by a competent person.​
Construction Material (Heating)	ABS Plastic​
Domestic/Commercial Use	Suitable for Domestic & Commercial Use​
Ducting Diameter	100 mm​
Ducting Included	Ducting Not Included​
Extraction Band	201-300 m³/hr​
Extraction Rate	245 m³/hr​
Extractor Fan Control Type	Standard​
Fan Diameter	100 mm​
Fan Operation Type	Mains Wired​
Fan Speed Settings	2-Speed​
Fitting Installation	Mount in Loft or Ceiling Void​
Fixings Supplied	Fixings Supplied​
IP Rating	IPX4​
Manufacturer Guarantee	3 Year Manufacturer's Guarantee (T&Cs Apply)​
Model Name/No	MF100​
Noise Level at 3m	24 dBA​
Overload Protection	Overload Protection​
Pack Size	1​
Pieces in Pack/Case	1​
Power Consumption	20 W​
Power Voltage Supply	240 V​
Product Depth	298 mm​
Product Height	230 mm​
Product Type	Mixed Flow Fan​
Product Width	175 mm​

 

[pete01]

Can't see why not.

 

[Murdochcat]

Not convinced two small fans will make much of a difference

 

[PB97]

better to check than find out the hard way.

 

[ericmark]

I'm planning to connect them to a smart Fused spur so that I can turn it on and off remotely via home assistant and a wireless temperature sensor.

Oh, please tell me more, getting a wireless temperature sensor to turn a zigbee switch on and off seems good, but 13 amp is around 3000 watts so it could control a 100 fans.

Looking at my own loft, not sure if too hot for a smart switch, but it should be OK.

Zigbee uses a hub, and I am unsure how hubs vary. My old hub now wants my email address, and what I pay and get for electric import and export. As to what it does with it?

 

[jj4091]

My thoughts would be that if you are sucking hot air in, which is what would happen when you sucked air out with the fans, unless you could place a vent up into the loft from your coolest bedroom, then you would not have much of a cooling effect. Perhaps you would be better with a small AC unit which everyone seems to be buying lately. Controlled remotely as you are going to do with the fans.

 

[ericmark]

I use a small AC, with the exhaust connected to the open hearth flue, this cools my living room, near enough.

I looked at the idea of fans.
1) Need to ensure outside cooler than inside.
2) Need to only run when inside is too hot.

A) bedroom (mine) only used at night so 1) does not apply. Have Tapo socket adaptor to turn on fan for 2 hours only.
B) Bedroom (wife's) does not get sun, windows North West, so often fans to outside would warm it up. But still have circulation fans on smart socket adaptors.
C) Living room, we have an AC, and if hot, solar panels produce more than it uses. It is also on a smart socket adaptor so it will switch off after 90 minutes, so the condensate will not overflow, also a pedestal fan, so with patio doors open, can force air from outside into the room.
D) Hall and Landing, we have a fan on a Wiser socket adaptor, this is not as flexible as the others, mainly there as a relay for wife's TRV head.
E) Craft room two fans to cool room manually activated when craft room in use, room not used enough to worry about.
F) Flat, we can open doors and use a fan to circulate air into living room out through kitchen in a U, fan on smart socket, but the doors are not, so needs them to be manually opened.

I have thermostats linked to sockets, mainly used for brewing, so can turn on a fan at say 27°C, but the problem is, that only works if outside is cooler.

So as it stands, some human has to decide what fan to turn on when. OK can set off time of say 2 hours. But unless I get out the PLC and program it to do things on a IFTTT basis then there is very little automation for our cooling. It is down to me to decide when to open or close a window, and when to run a fan.

I am sure there is a way to automate, but as yet not found out how, in a way anyone can use. I do not want to use a PLC, as then if anything happens to me, only my son could sort it out, and he lives 30 miles away.

 

[PB97]

Oh, please tell me more, getting a wireless temperature sensor to turn a zigbee switch on and off seems good, but 13 amp is around 3000 watts so it could control a 100 fans.

Looking at my own loft, not sure if too hot for a smart switch, but it should be OK.

Zigbee uses a hub, and I am unsure how hubs vary. My old hub now wants my email address, and what I pay and get for electric import and export. As to what it does with it?

I'm using home assistant and battery powered sonoff zigbee sensors so everything is local with no cloud or subscription to pay.

my plan is to create my own smart thermostat and have it automatically vent when it gets too hot as my attic and crawl spaces are staying about 10 degrees hotter than the ambie

I use a small AC, with the exhaust connected to the open hearth flue, this cools my living room, near enough.

I looked at the idea of fans.
1) Need to ensure outside cooler than inside.
2) Need to only run when inside is too hot.

A) bedroom (mine) only used at night so 1) does not apply. Have Tapo socket adaptor to turn on fan for 2 hours only.
B) Bedroom (wife's) does not get sun, windows North West, so often fans to outside would warm it up. But still have circulation fans on smart socket adaptors.
C) Living room, we have an AC, and if hot, solar panels produce more than it uses. It is also on a smart socket adaptor so it will switch off after 90 minutes, so the condensate will not overflow, also a pedestal fan, so with patio doors open, can force air from outside into the room.
D) Hall and Landing, we have a fan on a Wiser socket adaptor, this is not as flexible as the others, mainly there as a relay for wife's TRV head.
E) Craft room two fans to cool room manually activated when craft room in use, room not used enough to worry about.
F) Flat, we can open doors and use a fan to circulate air into living room out through kitchen in a U, fan on smart socket, but the doors are not, so needs them to be manually opened.

I have thermostats linked to sockets, mainly used for brewing, so can turn on a fan at say 27°C, but the problem is, that only works if outside is cooler.

So as it stands, some human has to decide what fan to turn on when. OK can set off time of say 2 hours. But unless I get out the PLC and program it to do things on a IFTTT basis then there is very little automation for our cooling. It is down to me to decide when to open or close a window, and when to run a fan.

I am sure there is a way to automate, but as yet not found out how, in a way anyone can use. I do not want to use a PLC, as then if anything happens to me, only my son could sort it out, and he lives 30 miles away.

home assistant deals with most of that, there's a big community that have pre programmed resources for it, you mostly just need to set the max and min you want

 

[ericmark]

Things have changed, only last night did I realise I could set tariff with zigbee. I need to do some research.