Anyway, the ground of the 350VDC supply would be the same ground as the 12V battery
The 350V should be from an isolated DC-DC converter stage.
so why dont people use those instead.
Thanks , yes.
Its a real situation.
Say some People have no access to mains electricity, but they have a device with a mains plug....all they have is a 12V battery, and they need to power the device.
These people can buy an existing 150W inverter in the marketplace today.
Bottom line, how much do you expect to sell these 75W inverters? What’s your estimated consumer RRP?
if you are trying to make a 240v inverter, then what you plug into will probably expect 50Hz/60Hz. But you don't say what the end user will plug into this new, super cheap inverter.
....Thanks for that jc101, the product from your kindly supplied #12 post says its "50Hz". So i believe i could do it cheaper, as there is no need for such a device to be "50Hz".
All it needs to do is output +300Vdc.
Or if we want to be snazzy, then we can get it to go +300V, -300V, +300V...etc...but of course, this certainly neednt be at "50Hz"....could be say 5 Hz, or whatever.
But yes, £4.05 is very cheap....the postage would of course be more than that, and that would have to be payed. There is also the
point that it wont be on the market till eternity at £4.05, since they are obviously not making a profit at that pricing.
That pricing is done to suck in greedy Western middle men and gazump all other competitors out of the market and make them go bust....which is a bona fide marketing strategy...but not something
that can be done forever.QuoteBottom line, how much do you expect to sell these 75W inverters? What’s your estimated consumer RRP?
...I believe we can make a profit as ours is simply boosting up to +300VDC, and not messing with 50Hz.
Even if we dont sell it for much less than current offerings, it doesnt matter, since all you need to do in UK
is "get into the market with a known and registered prescence as an electronics designer and manufacturer"......once you have achieved that,
you can then make massive money by importing electronics in for people from China (middle-manning)...because your status as an electronics
company makes people think you are knowledgeable enough to buy in their electronics from China for them, and you then take your mega-riches, middle man cut.
...P.S: You're proposing to put 300V DC on a standard UK mains socket?
Quoteif you are trying to make a 240v inverter, then what you plug into will probably expect 50Hz/60Hz. But you don't say what the end user will plug into this new, super cheap inverter.
Thanks, as you know, only certain types of fans and drills need 50Hz sine. The vast majority of loads will not need 50Hz either sine or quasi sine...they simply have a big capacitor after a rectifier bridge...absolutely no need for any 50Hz.
The £4.05 includes free shipping to the UK. The regular price is £15, including shipping to the UK, but it is undoubtedly much cheaper in bulk. There are 100's available to choose from around the £15 mark, delivered to the UK.
A good number of devices, designed for 230VAC will work fine from 250VDC. No need for an inverter. The switch not being rated for DC is seldom a problem because the same switch will be designed to withstand the large surge taken to charge the filter capacitor, which already requires considerable over-rating. Light switches are also a non-issue, since they were originally designed for >100W light bulbs and the associated turn on surge, so will be able to handle tens of watts at DC.
...
A good number of devices, designed for 230VAC will work fine from 250VDC. No need for an inverter. The switch not being rated for DC is seldom a problem because the same switch will be designed to withstand the large surge taken to charge the filter capacitor, which already requires considerable over-rating. Light switches are also a non-issue, since they were originally designed for >100W light bulbs and the associated turn on surge, so will be able to handle tens of watts at DC.
...
The issue with AC switches isn't the turn-on, it's the turn-off... breaking a DC arc, without zero cross interruptions.