The wonderful world of portable generators as a practical solution for power tools

[Tranona]

75a/h battery, don't want to discharge it much beyond 50% (it'll severely shorten the life of the battery if you do) so being generous maybe 40a/h usable capacity

A 1kw inverter will at full continuous load draw approaching 90A from the 12v supply

So you'll get 25 minutes or so

Obviously, if the load is reduced, the endurance will go up so a 500W power tool you could run for 45 to 50 minutes

The generator, for this purpose, would I think be a better bet

and a 1kw inverter would cost more than a decent generator, and have no other practical use on the boat with that kind of capacity.

 

[Nicholas123]

Not to worry gents,I think the house hold cavalry might yet be riding to my assistance in the form of my ever helpful & friendly neighbour who seems to have every known DIY gadget imaginable (though not a battery angle grinder) & a garden full of plastic gnomes.

He has just informed me while I was trying to bodge up my wooden garden chair that he has a portable generator in storage in his shed that he bought twenty years ago.It has'nt run for two years but he is going to fire it up shortly.It is apparently still in the box

 

[guyd]

A 450w angle grinder isnt pulling 450 watts unless its being used as a polisher. Cutting with a grinder requires a light touch. For example i once cut an entire tractor back axle casing in half including the inch diameter drive shaft with a single thin 5 inch disc. Just.

so i suspect that it would last a fair bit longer than that.

In reality how long do you cut for? Polishing etc i accept is a long process but iirc the OP asked about cutting only.

 

[BERT T]

Quote Originally Posted by essexboy
I'm on a visit to family in Chicago, and just looking at tool shop flyer, generators that are NOT top quality range from 700 running/ 900 peak @ $ 89 to 11,000 running 13,500 peak for $1500 with a 2200 running inverter generator @ $ 500
Why so much more in UK ?

Because we are British.

+1 Rip off Britain once again.

 

[TonyMS]

For small (5 or 6mm) bolts or rod I use a Dremel, sometimes with, sometimes without, a right-angle attachment. Easily runs off my 300W inverter. Not quick, but not as slow or messy as hacksawing.

TonyMS

 

[PotatoNavigator]

Why not just pay for a short stay in a marina with electricity?

 

[ronsurf]

I don't suppose a hacksaw would do the job would it? Get a decent carbide blade and it'll go through in no time.

 

[Avocet]

I don't suppose a hacksaw would do the job would it? Get a decent carbide blade and it'll go through in no time.

You've just started my cold sweats and flashbacks off again now! You reminded me of the time when I thought I'd "just chop an inch off" my 1" diameter stainless propeller shaft in a cramped bilge, on a long keeler, with a hacksaw, to fit a new couping...

...NEVER AGAIN!!!!