invertor advice

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izzy_mack
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Joined: Thu Aug 15, 2013 12:35 pm

invertor advice

Post by izzy_mack » Tue Jan 24, 2017 12:09 pm

I need to buy a new invertor . Bought one from lidls a while ago but gave it to someone who needed it more than I did, they haven't had any in store since so time to find another. any tips on where to find a cheap one? Also how do you decide what size you need, it may be worth my while buying a more powerful one than I had but not sure. I do have a generator but don't want to run it all the time, so would use this to run small things when it's off or to run things where the gennie won't reach. thanks.

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shocker
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Location: cornwall, near england

Re: invertor advice

Post by shocker » Tue Jan 24, 2017 1:48 pm

I have found that the power claims for these are wildly optimistic - like speakers quoting the peak power rather than the RMS value. So, I consider these devices able to deliver a quarter of the stated power for any use over a few minutes. Cooling is a big issue to getting the best out of them too so you may want to consider extra fans especially if its enclosed.

If you want to run laptops/TV off them then a FULL sinewave output is best.

As to where to buy them, I dont really know whats best. What I do is go to a caravanning shop or forum and find out what they advise, then go look for the one suggested on fleabay etc. Maplins may be a good bet.

Anyone else ?
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Hamradioop
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Re: invertor advice

Post by Hamradioop » Fri Feb 17, 2017 2:51 pm

keep away from Maplins expensive.
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shocker
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Re: invertor advice

Post by shocker » Fri Feb 17, 2017 5:35 pm

So NOT maplins then ! Anyone know where it IS good to buy one ?
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Yorkshire Andy
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Re: invertor advice

Post by Yorkshire Andy » Fri Feb 17, 2017 5:38 pm

If your roughing it, Your doing it wrong ;)

Lack of planning on your part doesn't make it an emergency on mine

Yorkshire Andy
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Re: invertor advice

Post by Yorkshire Andy » Fri Feb 17, 2017 5:41 pm

Just beware a 1000w sine wave will draw 40a when loaded with a KW or so from a battery so in a hour that's a 80ah battery technically flat....
Going by a 50% DOD (Depth of Discharge)

I have tried to get most things to run on 12v directly rather than step up from 12v to 230v to step down to say 5v for a USB phone charger for example = less loss = much longer battery life
If your roughing it, Your doing it wrong ;)

Lack of planning on your part doesn't make it an emergency on mine

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dangerman
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Location: Liverpool

Re: invertor advice

Post by dangerman » Fri Feb 17, 2017 6:43 pm

Do what that bloke says.

I've bought some cheap Chinese ones from eBay, one didn't work at all and the other one didn't work for very well or for very long.

For laptops and phones and things, though, there are direct 12v adaptors that work fine. I'd go for them if they're justifiable.

Just realised actually, the laptop I have the 12v adaptor for got destroyed a few months ago. :(

Anyone need a MacBook car charger?
I love motorcycles like a fat guy loves cake. I also love cake.

izzy_mack
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Re: invertor advice

Post by izzy_mack » Mon Feb 20, 2017 2:08 pm

thanks guys, reckon the short answer is i need to find a little more funds from the pot and buy bigger and better quality. one of those times when spending more saves more. didn't think I understood the techie stuff yorkshire Andy, then I reread and concentrated and I did!! Must be learning more from reading this forum than I realised :D

Appin
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Re: invertor advice

Post by Appin » Mon Feb 20, 2017 5:58 pm

On a more general note there is a book called "Emergency Power for Radio Communications" by Michael Bryce and American Radio Ham. It is available from the Radio Society of Great Britain Website.

If you are looking at your power plans it is a very good study of what works and the various possible ways to keep power going off grid. Good even for the non ham prepper.

Probably a bit more than most would want but he covers when inverters are useful and the battery bank you need to back them up.

Regards

Appin

Yorkshire Andy
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Re: invertor advice

Post by Yorkshire Andy » Mon Feb 20, 2017 8:00 pm

izzy_mack wrote:thanks guys, reckon the short answer is i need to find a little more funds from the pot and buy bigger and better quality. one of those times when spending more saves more. didn't think I understood the techie stuff yorkshire Andy, then I reread and concentrated and I did!! Must be learning more from reading this forum than I realised :D

Sorry I tried to keep it simple :oops:

For others:

A leisure battery (caravan or boat battery) come in a couple of "standard sizes" in terms of capacity

85ah. And 110ah. ( imagine a bucket and a bigger bucket)


Now to avoid damaging the battery it should never be more than 1/2 emptied. (Think of it been a folding bucket) let water out it collapses

Also known as 50% dod

(Basically over emptying damages the battery internals so it won't fully charge again)




Current draw is the speed you empty your bucket

Drill a small hole in the bottom water trickles out slowly = long run time till the bucket is half empty


Drill a ruddy great hole water drops quickly

So say a Metre of 12v led strip draws about 1amp per hour

Think of amp hours as water


Your battery has a 100litre capacity

Your led light has a 1 litre drain per hour

= you get 50 hours of use able time


But your "hair drier" uses 50 litres per hour giving you 1 hour of use time...... Till the battery is drained


http://www.campingandcaravanningclub.co ... batteries/


https://www.caravanclub.co.uk/advice-an ... batteries/

https://www.google.co.uk/url?sa=t&sourc ... w24fLCIeTQ


http://batteryuniversity.com
If your roughing it, Your doing it wrong ;)

Lack of planning on your part doesn't make it an emergency on mine

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