this is a VERY powerfull charging solution, but unless you are charging big big packs, like 5000mah 8S it may be overkill,
or if you plan on charging multiple packs at the same time using the Para board that the company (powerlab) sells, at which point you can charge 6 packs at a time...
this is comparable to the system I built up though my case is a little less robust,,,

I use a Powerlab 8, the Para board balancing board, and a home brew server power supply setup that provides more watts than the 1340 the PL8 can use ( at 24 volts)

Prior to that I used two 200W chargers to charge one pack at a time on each charger...

http://www.usastore.revolectrix.com/Products_2/Cellpro-PowerLab-8-EC5-version_2/PL8_MPA-XH_Combo_207

This is what I bought,,
then I bought two server power supply units and wired them together ( following directions on RCU). The server supply units were about 30 bucks each I seem to recall

The two individual units I was using were AC/DC 200 W which would probably charge two packs of yours at a time. but with my packs, it was one pack at a time
of course charging multi packs requires some form of balancing board, I NEVER EVER EVEN ONCE charge my LiPo packs without balancing them,,
I cant recall the exact model of chargers I used,, they are at home,,

bottom line, buy the best charging system you can afford, it will pay for itself as you grow and progress through various iterations of power systems...

I did not , I started off with a fairly inexpensive charger, then stepped up , then stepped up again to the dual chargers, then finally bought the current PL8 setup,, wish I would have done it from the start, 

http://www.progressiverc.com/icharger-306b.html Is the one to get and contact William DeMauro on this site for the 24v power supply.

MM

Amen on the server power supplies.  If you aren't electrical-minded, Will DeMauro used to wire them up for folks. He may still be doing this.

Edit: I see that Motorman already mentioned Will.

Fred's yellow box is cool.

My old Hyperions can charge at 6C and the new Thunderpower say 12C. I charge at 2C with no worries. I gang charge with the squid cables but storage charge one by one. icharger 306b buy one and done.

As noted, parallel charging can hide some changes in the individual packs.  You can get a good idea of the pack at the end of a flight.  Look at the cells by putting a single battery on the charger or use a cell checker, many inexpensive available.  You can also look at cell voltage under discharge load to the pack and see if they are different and compare packs, see the battery discharger thread.  Finally, it is best to charge individual packs and balance, at least occasionally.  PowerLab and iChargers will also check internal resistance.

The Squids that I've seen advertised are cell count specific, at least for the balance connector, not power input.  So you can have separate balance connectors for 4, 5, and 6 cells if you use different packs, or use the parallel board.  The safest board is the MPA fused board.

http://www.progressiverc.com/fma-multi-port-safe-parallel-adapter-for-jst-xh-t-plug.html

I use that with the PL8 charger.  You can see the shielded power cord ends made to fit the PowerLab chargers. The shielding has to be removed, or worked around with adapters, to fit other chargers.  The shielding prevents shorting if a battery is on the board and you unplug from the charger - not a normal procedure, but could happen.

The Zippy Compacts, 6S 2700 25C discharge also say up to 5C charge.  Best for the batteries in most cases is 1C, for all brands.  That's my routine charge when at home and planned ahead.  I may use 2C at the field, and if a power source is available, not just my car, higher is ok.  If you want faster, look at the slow portion of charging, the finish at C/X where you can choose the x to be 5, 10, or 20 as usual numbers.  That is a slow top off for few mah.  C/5 will speed the process and work well unless you are using every last mah to finish a flilght and stay at 80%.

A reason to use 24V input instead of 12 is that the charger then doesn't have to step the voltage internally and use some of its power.  That also means a cooler charger.

Quad versus parallel - Unless you compare specifics, in general, the quads are not the quality of the iChargers and PowerLabs.

Fred's yellow box is cool.

Thanks Howard

Thanks, the box is Pelican Storm as below.  The Nalpack link auto opens in the thread if I put the full real link where the box is about $62.

www.nalpak.com/Pelican-Storm-iM2100

and similar

https://www.zoro.com/pelican-case-14-14-in-lx11-12-inwx6-12-ind-bl-im2100/i/G4786844/?gclid=CLeVlK3JycICFRSFfgod3n4AUQ

That's the smallest box I have seen used to pack 2 power supplies (24V), and 2 chargers and parallel boards.  Of course it is one off scratch built, so no real instructions.  There are several to be seen in various RC groups, mostly larger and more expensive.

If you get serious about building one, or similar, let me know and I can help with a few details and parts.  Figure the parts and space before any purchase as choice specific power supply can take too much room.