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Subject Topic: Power inverter Post Reply Post New Topic
via mobile 26/7/2020 at 11:12am
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Hi guys , looking for a 12v to 240v power inverter to use with my inflatable beds . Any suggestion? From 600w up that isn't to big or to £££££ . So many on Amazon but witch one ?Thanks


via mobile 26/7/2020 at 11:35am
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Ours is made by Meind it's a pure sinewave and was only about 70 quid. It's 1000w


26/7/2020 at 11:41am
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Been using a 12v Mercury 600watt Pure Sine Wave 230v inverter, it handles my 600 watt kettle, and was previously used to power a mains fog machine, inverter is over 5 years old so I guess you could call it reliable.


26/7/2020 at 12:38pm
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why not just buy a 12v air bed pump? they cost around a fiver, we use them on our kayaks and dinghy and that only takes 5 mins then to pump up


26/7/2020 at 2:05pm
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Quote: Originally posted by marg6 on 26/7/2020
why not just buy a 12v air bed pump? they cost around a fiver, we use them on our kayaks and dinghy and that only takes 5 mins then to pump up



I have an air-bed with a 240 volt pump built in. I don't know how I would pump that up with a separate pump, as there isn't really anywhere to connect one. Perhaps the O/P's is the same?


-------------
Best Regards,
Colin


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via mobile 26/7/2020 at 3:03pm
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Yep Colin, hence the requirement for an inverter, surly that will be the reason why for the OP.


26/7/2020 at 6:04pm
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Quote: Originally posted by Colin21 on 26/7/2020
Quote: Originally posted by marg6 on 26/7/2020
why not just buy a 12v air bed pump? they cost around a fiver, we use them on our kayaks and dinghy and that only takes 5 mins then to pump up



I have an air-bed with a 240 volt pump built in. I don't know how I would pump that up with a separate pump, as there isn't really anywhere to connect one. Perhaps the O/P's is the same?




yes but even those have the point for a hand pump to go in, and where they deflate from, so that is why i said about just using a 12v pump and inflate it via that



14/5/2021 at 7:06pm
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Aldi have got a 300w inverter in store next week, £28 you can buy cheaper inverters of eBay but Aldi stuff is normally good quality and comes with a decent warranty.

Could be just what I need for powering my 300w in car kettle directly of the car battery, save using my portable battery box with 600watt Pure Sine Wave inverter at 26kg it’s a bit of a lump to keep moving around.

I don’t think this Aldi inverter will be a Pure Sine Wave model, more likely to be Modified Sine Wave, I don’t care as I will only be using it for the kettle, so no delicate electronics to get damaged by a dodgy Sine Wave.


18/5/2021 at 1:21pm
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I can confirm that the Aldi inverter in store on Thursday this week is a "Modified Sine Wave" type, which is not ideal, but will be fine for my intended use.


26/5/2021 at 8:50am
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Well I was in two minds about buying the Aldi 300w inverter, due to it being a “Modified Sine Wave” model I would normally only consider the “Pure Sine Wave” type.

But the 3 year warranty and being able to return it to the store within 28 days for a full refund, if did not suit my purposes was what made my decision to purchase one.

Anyway as will only be using it to power my electric mains kettle of the car battery (with engine running) I thought I would get one.

The inverter is tiny, about a third of the size of my 600watt Mercury inverter, in fact the Aldi inverter just about fits into the palm of my hand.

The Aldi inverter handles a 300w load with ease, although the supplied cable is only 12awg (4mm) at 75cm they run warmer than I am comfortable with, I would have said the supplied cable should have been 10awg (6mm), I will be using 8awg (10mm) of a similar length.

I ran the inverter for 10 minutes, just for test purposes my real world use will involve it running for no more than 5 minutes at a time, probably less.

All in all, it seems a decent bit of kit for the price.


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26/5/2021 at 8:32pm
 Location: West country
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Cable temperature depends upon what the insulation material is on the cable.
XLPE (Cross linked polyethylene) cable has a conductor operating temperature at maximum current capacity of 90 deg C. That's hotter than your heating pipes. PVC cables were 65 deg C.

Needs to be used with caution though. I always oversized cables because I never believed a client would accept that as correct when he burnt his hands on it.



26/5/2021 at 9:38pm
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Yep navver, I ran the Aldi inverter at full tilt on some 8awg (10mm2) copper cable today, and the cable was cool as a cucumber.

I am not expecting much from this 300watt £28 little inverter, it's got a hard life ahead of it running my 300watt Xiaomi MIUI kettle, will have to just see how it works out, with a bit of luck it will take the concept of an in car 12v kettle to the next level.


10/6/2021 at 12:35pm
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Further update on the Aldi 300watt inverter, in that it turns out to be a "Modulated" Sine Wave not "Modified" Sine wave, which could explain why it works so well, I am not really sure what the difference is apart from "Modulated" might mean that it's a filtered output, so better than "Modified" but not as clean a Wave form as "Pure" Sine wave.

I would like to have a look at the Wave form, but I don't have an oscilloscope, but I am curios to see what it looks like, I know someone who has an oscilloscope, so it looks like they will be getting a visit from me..

All that I can say is that the Aldi inverter is running my 300watt (320watt) kettle no problem, even with the engine of, and pulling 27.50amps so around 90% efficiency, and just under the rated 28 amp max spec according to the manual.



10/6/2021 at 7:41pm
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If you get the chance put your oscilloscope on the mains in your office. Most are a very long way from a sine wave. All the switched mode power supplies.


10/6/2021 at 10:34pm
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Yep navver, I am amazed that this cheap tiny little 300watt inverter from Aldi is powering my 320watt kettle without an issue it doesn’t even get warm.

Upping the supplied cables from 12awg (4mm2) 25amp to 8awg (10mm2) 70amp has obviously added to it’s performance as the original cables were getting a little warm.

Although 10awg (6mm2) 40amp cable would have done, but I did not have any in the workshop at the time, although I will be ordering some 10awg (6mm2) 40amp soon.

Using the kettle, the inverter is only drawing 27amp, so 10awg will be more than adequate, especially at just 70cm in length.



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