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Quite / fanless inverter

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26 Jul, 2019 @ 06:46:57 am
Rare Breed
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I am looking for a small inverter, ideally a 300w inverter that’s doesn’t have a fan or quite. I will use the inverter to power electric blanket. The one in my possession has a fan and very irritating noise and won’t be able to sleep. 

Where can I get it?

 

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26 Jul, 2019 @ 10:13:14 am
Leon
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This is a new requirement.

Does an electric blanket only use about 300 Watt????  I would have thought it uses more because of the heating type element.

I have a 1000W peak with 600W running inverter back home. Very small and quiet.  I will how ever only give details when I back home by beginning August.

GOD IS ALTYD TEENWOORDIG
Sonder Jesus is ek niks! ! ! !
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26 Jul, 2019 @ 10:33:04 am
Fred
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Our single bed blanket is rated at 50W and that is what we use in the caravan. 

I am guessing, but I suspect the small inverters use an electro-mechanical method to change from DC to AC and it is therefore not a fan that you hear, but a motor turning to do the change.  Again I am guessing, but would there be any possibility of using a computer UPS to do the work?  Most of them these days are rated far above 300 W and they work without making any noise.   Perhaps someone with more knowledge like Danie might be more helpful.  They are more expensive than an inverter though.

Het is beter rijk te leven dan rijk te sterven
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26 Jul, 2019 @ 11:05:27 am
mulderpm
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Hi Mawonga and welcome.

I do not know of one that does not start up a fan under load. Some ones have the fan running continuously.

Maybe fit the inverter in a sound proof box with some ventilation slots or outside the caravan. The 220V cable can be long.

Groete,
Paul
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26 Jul, 2019 @ 11:06:09 am
Danie-SLK
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Just on the power side electric blankets can draw 60W per side on normal setting and about 120W on pre-heat. It is still the cheapest way to get warm :)

Just on your question about inverters. There are many inverters that would only use the fan when it is charging the battery or when it is using over 60-75% of the load from battery. Some also will change the speed of the fan depending on the load.

Ask the technical people before you buy when does the fan come on.

Contact cooperpower.co.za and ask about the simulated inverters and enquire about the fan. The guys normally know their products very well.

 

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29 Jul, 2019 @ 00:40:22 am
Danie-SLK
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I can confirm after speaking to Hennie that the Mecer 720W (sim sine wave)  is a great inverter but it has a bit of a noisy fan and the fan does come on the moment the grid power is lost and also when it is charging the battery. Even with the inverter in a cupboard the fan can be heard. Due to the low current charger it means the fan might be on for a very long time after the grid is back on.

Paul yes there are inverters that would not start the fan even when the grid is off and only come on when it reaches a certain temp. Also some will change the speed depending on the temp. If it has a 10/20A charger there is enough heat generated during charging to always trigger the fan to be on but this time is much shorter than the low current chargers. Some inverters only have a 1A charging circuit and are normally only trickle chargers.

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29 Jul, 2019 @ 06:45:10 am
Hennie Botha
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I can confirm after speaking to Hennie that the Mecer 720W (sim sine wave)  is a great inverter but it has a bit of a noisy fan and the fan does come on the moment the grid power is lost and also when it is charging the battery. Even with the inverter in a cupboard the fan can be heard. Due to the low current charger it means the fan might be on for a very long time after the grid is back on.

Paul yes there are inverters that would not start the fan even when the grid is off and only come on when it reaches a certain temp. Also some will change the speed depending on the temp. If it has a 10/20A charger there is enough heat generated during charging to always trigger the fan to be on but this time is much shorter than the low current chargers. Some inverters only have a 1A charging circuit and are normally only trickle chargers.

I  have a 1440W Mecer inverter as well, and the fan also goes on when the power goes off. The fan will continue running, even after the power is back on and until the batteries are fully charged again. The 1440W is a 24V unit and the 720W is a 12V unit.

Sê dankie vir wat jy in die lewe het.
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29 Jul, 2019 @ 08:46:41 am
Danie-SLK
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I just want to add a correction. The 720/1440W Mecer has a charger of 10/20A and the low charge rate is related to a lot of smaller UPSes.

The Meanwell TS-200 pure sine wave does not have any fan and big enough for electric blankets. Expect to pay over R3000. The TS-400 with fan only cost R100 more.

Fans although not liked is there to protect the heat generating components inside as we know everything is made cheaper and fans are a cheap solution to using higher rated components.

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29 Jul, 2019 @ 10:57:12 am
Anonymous

What we have done, especially in the houses where inverters are installed, and where their fans are temperature sensitive, we used another fan with a verys low speed and such a low noise that it is kept on permanently and cooling the inverter so that it's own noisy fan almost never come on......

Try that maybe first and get a 24V fan and connect that to 12V.. It will run at a lower speed and have much less noise and even keep the inverter cool anyways... The power consumption is extremely low in this case

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12 Jan, 2020 @ 11:27:26 am
Danie-SLK
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When I say this inverter with 200W output I thought this would be a handy device during winter camps (for those with guts) for the electric blanket if there is loadshedding during the night. It seems like there is more loadshedding during the off peak period as they try to do repairs.

Landed cost in SA about R415. Good to also see the battery voltage when using it.

@Leon - how about sharing the details of the 600W quiet unit you have?

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12 Jan, 2020 @ 11:57:03 am
Rare Breed
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When I say this inverter with 200W output I thought this would be a handy device during winter camps (for those with guts) for the electric blanket if there is loadshedding during the night. It seems like there is more loadshedding during the off peak period as they try to do repairs.

Landed cost in SA about R415. Good to also see the battery voltage when using it.

@Leon - how about sharing the details of the 600W quiet unit you have?

I love the voltage display, please share details of where to purchase.

 

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12 Jan, 2020 @ 20:31:35 pm
Danie-SLK
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I only saw after I placed it that it does have a fan coming on at 38 degrees. This is on Banggood. 

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12 Jan, 2020 @ 20:59:39 pm
Danie-SLK
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This model seems to be without a fan. Also on Banggood.

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15 Jul, 2022 @ 07:40:23 am
Rare Breed
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This is a new requirement.

Does an electric blanket only use about 300 Watt????  I would have thought it uses more because of the heating type element.

I have a 1000W peak with 600W running inverter back home. Very small and quiet.  I will how ever only give details when I back home by beginning August.

Just a revival, any update please. 

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15 Jul, 2022 @ 08:59:55 am
Fred
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Mawonga, if the blanket is the only equipment running from the inverter, I would guess it will not generate much heat and it would be safe to disable the fan. You can probably do this through a small toggle switch mounted on the outside so that you van switch it on of off as needed.  If you use the blanket through the night, is presume you will set it at a low temperature once your bed is warm enough and then it will only draw a small current, probably not much more than 30W of so for a double bed size. If you do this, for the first time just feel how hot the unit becomes.  Just keep in mind,if you decide to add such a switch, any warranty will become void is this still applies,

I agree the fan, although small, makes too much noise to have a comfortable sleep.  I have a more sophisticated unit of 3000W where the fan only comes in when a heavy load is drawn.  I have up to now never heard it doing so.

By the way, my previous statement that what you hear is due to something else that the fan, was completely wrong🤬.  I did not have experience of such equipment at the time- sorry!

Het is beter rijk te leven dan rijk te sterven
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