What's the point of this

On Wed, 18 Mar 2015 13:31:35 -0000, Bill Wright wrote= :

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What if it's got twin GPUs? Anyway, no harm in having extra power in ca= se you need it. You never know what things you might want to plug in.

-- =

Give a person a fish and you feed them for a day. Teach a person to use = the Internet and they won't bother you for weeks, months, maybe years.

In message , at 13:33:00 on Wed, 18 Mar

That's a bit big. A narrowboat would typically have four 110Ah batteries for the 'hotel power' and a fifth one to start the engine in the morning.

That's where you put the batteries, plus even more ballast usually. I've seen scrap iron, paving slabs, all sorts of things.

Someone who lives on a boat who wants to run an electric cooker off a marin e alternator?

Robert

Its a canal boat, they were used to carry 100 tons of stuff about, a few small batteries doesn't matter unless you put them on the roof where someone will knick 'em..

In message , at 15:25:35 on Wed, 18 Mar 2015, charles remarked:

I used to have a Land Rover with twin 24v alternators[1] and 24 batteries. That was to power the army field radio station that it originally had installed in the back. (keyword: FFR)

Trouble is that the Maplin advert will appeal to the sort of person who would think that that was a good idea!

It does say laptops - in the plural. It would probably power about 100 at a time!

On Wed, 18 Mar 2015 16:53:17 -0000, Roger Mills w= rote:

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The description is probably copied form the smaller models.

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Seen in a lift: "Please do not allow excessive obnoxious gaseous substances to be releas= ed from your anal orifice as the ventilation system is limited".

I meant that that is a modified square wave, not a modified sine wave.

It may well be a modified square wave, in literature and specifications it is generally described as a "modified sine wave".

My Dad has a pure sine wave invertor. Just to power up the CH, the TV and a couple of lamps and a small travel kettle if needed.

Several people said it would not work with his CH but it did:-)

In message , at 19:44:43 on Wed, 18 Mar

I've got a 3KVA UPS which I hope produces something close to a sine-wave. It's got about 30Kg of metal inside (as transformer cores) and originally cost someone about $2000. I've never found anything that objected to the output.

Rather mad to have an electric cooker in a boat tho unless it's a microwave.

More useful for running motor driven power tools which need a decent startup current but which don't actually use 5KW continuously and which won't start when say a 1KW inverter is used.

It's a perfectly viable proposition on many small[ish] boats which aim to be a sort of mobile bedsit. Even on our little 12 metre boat we have 3 x 100Ah batteries which could supply 500 amps for half an hour or so. Anyway a 5kW inverter is unlikely to run *continuously* at

I have the 300W version of that, for powering my central heating. It didn't tie the neutral and ground together, which I had to do to make the flame sensor in my Potterton Profile work, after which it was fine.

I did previously run it from a modified sine wave inverter, and it worked, but the pump made quite a bit of extra noise, and might not have been running at correct power/speed.

That sounds like an old type which basically bangs a low voltage "modifed sine" wave (i.e. square-ish wave) into the primary of a

The output is probably something between the cheap modern modfied sine wave inverters, and a real sine wave. In particular, the sharp corners won't make it through the transformer (although the flat peaks will probably decay on the output side too).

I did the same thing over 20 years ago (a 500W 12v version) which I ran off 2 12v banks of 225AH ex PABX lead acid cells that I'd revived back to 80% capacity (200 hour rate mind you! :-).

I didn't use it in anger, just a very few hours on a 3 x150W test lamp load. It's actually the reason why a 2 foot 20W fluorescent fitting is missing its PFC capacitor to this day (the inverter didn't like the capacitive load one bit).

I rather doubt you will. My ancient SmartUPS2000 surprised me by taking the de-gaussing surge of a 19 inch colour monitor in its stride and that's only rated at 2KVA / 1500 watts).