Advice on Lighting

You're going to have great difficulty lighting a large sports hall with that gear the range of any flash gear is limited and it falls off rapidly - also if its an actual event then flash may not be allowed.
If its a formal staged team photo then you're still going to struggle to light the entire team evenly. with the gear you have.  

So are you going for a black background?

If so, I’d consider bringing a paper background.

I think I’d struggle to light it with three 1000ws mains units.

There's some discussion of this in strobist.com

_Why_ do you want to turn the lights off?

So far as the distant parts of the darkened building go, you are allowed to fire your flashes several times, leaving the camera on the mounting, and add them up, or indeed to make a long exposure and shine any light around.

Do you use a colour card? Are there windows? Do you have a big roll of a corrective gel - window green if the light were fluorescent, quarter CTO against incandescents if they are still around, and so on?

Pretty much impossible to advise specifically without seeing the hall and team, but you'll likely get away with it by smashing up your ISO.

For similar group portraits in large rooms I would typically use 2 or 3 400/500W strobes, fitted with 1 large soft box for a subtle key, and large white brolly's bouncing off of white(ish) ceiling and/or walls for fill and ambient.

There is not enough info in your question.

e.g. How many people do you need to capture? What kind of sport? And is this a "team photo" or are you hoping to catch action?

Shooting most sports with no ambient light would quite likely be positively dangerous.

Look up Matt Hernandez on YouTube, you'll get a feel for what you need from him

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Better than I expected.

Could you bounce the flash off a white wall behind you?

That would even up the light.

If you can darken the room, you could shoot at 800 ISO to make up for the loss from bouncing the flash.

If you had a high speed synch mode allowing 1/1000 or so that would also drop the ambient light.

Please keep us informed - good learning experience for all of us.

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Green walls!  :(

Maybe a white bedsheet and some duct tape?

My Land Rover Defender is white so I can use it as a reflector outdoors  :)

How about bouncing the lights off two large reflectors beside you? Or if you have the space in your means of transport, get a couple of clothing racks covered in diffusion material and shoot through them?

Amazon Basics Clothes Rail with Wheels, Chrome, 91.5-145cm x 42cm x 134-161cm : Amazon.co.uk: Home & Kitchen

DIY Diffuser 5x3.3ft Nylon Silk White Seamless Diffusion Fabric for Photography Softbox, Light Tent and DIY Lighting Modifier, 1.5x1M: Amazon.co.uk: Electronics & Photo

I've just bought a couple of racks (slight more expensive ones) and got some black-out material for a shoot coming up next week, so I can control the light better at my home studio. £50 odd quid for all the items and I can use the clothing racks to hang clothes or act as reflectors/diffusers by using the relevant fabric. They compress down or can stretch to over 6ft. Take minutes to set up with a bit of Velcro!

Simondclarke

You have an interesting and effective but deep formation there.

I'd suspect that focusing on the 2nd row you'd need to stop down your aperture to F/11 or f/8 to include front and back rank in sharp focus.

You mention exposure/shutter speed.

Your exposure is somewhere between 1/1000 and 1/10000s isn't it, regardless of the speed the clicky mechanism moves, that being the duration of the discharge in your flash tube.

You have with your single flash head an over-exposed front, and under-exposed rear rank. Not bad, and for a team photo I'd think it won't cause complaint.

A solution is to place one flash level with each rank, at each end, in a row at the same angle as your line or V.

Very low power.

If you don't have 11 flashes conveniently to hand ;) then I expect you can get by with one flash per side per 2,3, or 4 ranks.

Lacking even so many, you could employ reflectors. A barn door or some foil to reduce the (doubled) light on the point person, and bits of shiny stuff down each side gets it down to 2. Can you have 4 assistants and a long roll of wide cooking foil, stretch out 2 pieces?

Edited by MidgePhoto

These are the racks I bought. They were £21 a week or so ago!

SONGMICS Adjustable Garment Rack Clothes Hanging Rail Stand with Middle Rail - Stainless Steel Clad Pipe LLR41L Blue : Amazon.co.uk: Home & Kitchen 

I like your shot and I've edited a few team pics in the past, if they gave you 30 minutes to do it then they should be grateful.

How about, rather than have the lights either side of you and you photograph from in between the lights. You move the left light to face players 3 and 4 on the left side, but out of your pic. This will even the light between the back and front row. Then do the same the right side. Use the 3rd light from about 10 ft back behind the captain to rim light everyone? Alternatively a silver 7ft reflector umbrella and photograph under it and lights on the sides, I swear by it, god know I get blinded by that setup at home.