Re: hefty amps-- DC 24-48V @ 1kA supply


Since regulation isn't important how about a big stack of paralleled
lead acid batteries? Star topology wiring would probably be best.

Even expensive marine batteries will not supply that kind of current
for long.

You can parallel enough batterys so that it is with the capability
of the individual batterys, it's a question of run time between
recharges
and duty cycle because the batterys will take a while to charge.
Can't comment on that without knowing the application.

Elecsol lead acid batterys with carbon fibre in the plates are
reasonably priced and can do high currents, deep discharge
and 1000 cycles. The limited number of cycles could be
a problem. The safety requirements for liquid acid batterys
may also be onerous.

Anyway I assume lead-acid is not going to work for you.

Various manufacturers like lambda power and unipower-corp
make SMPSU modules that work in parallel.
Unipower TWRI series will do 9000 watts

Bob

That's interesting, thanks. Big bus bars I guess. Perhaps
$0.50-$1/watt?

Those manufacturers are at the high quality/high price end
of things. They are a bit more than $1/w here but we pay
far too much tax.
If you want cheap you need to be looking at buying direct
from China. For example these
http://www.meanwell.com/search/SCP-2K4/default.htm

Cheap and cheerfull is a bit worrying that this power level.
I'd want to fuse the individual outputs and check the individual
outputs with a clamp meter and trim them so they
balance the load.

Bob
.