A little bit about my Dry Cell setup:
2 sections totaling 66 plates (#18 316L 10" * 12") divided into 8 stacks:
+7N-7N+7N-7N+ | +7N-7N+7N-7N+
1/16" EPDM 55-65 durometer gaskets with 3/4" width on perimeter.
Working area of each plate is 8.5"* 10.5" = 89.25 sq.in.
Theoretical max. power consumption limit: 89.25 sq.in. * 0.5A * 8 stacks = 357A
Voltage source: 220A Delco Heavy Duty Alternator outputs 14.2V to the Dry Cell.
Wiring: 10' #1 welding cable wired through 250A fuse, with inline 35 Farad BOSS CAP35 Super Capacitor, 300A HD solenoid relay, from there distribution through #4 OFC wires to each stack.
E-Lyte: 4 gal. of distilled water from Walmart @ 21% KOH Concentration.
Ports: 2 x 3/8 barbed 1/4" NPT brass fittings (inlet), 3 x 3/8 barbed 1/4" NPT brass fittings (outlet).
Filters: 1 x inline Defoamer / sediment filter, Wet filter, Dry filter.
Sidewalls: 3 x 1" * 11.5" * 13.5" Polypropylene sheets.
Bolting: 3/8" Anodized metal rods with compression springs.

In progress:

MECHANICAL:
E-Lyte cooling system,
Continuous duty 3.3 gal pump
Flashback arrestor
Adjustable overpressure release valve
Vacuum valve
check valves

ELECTRICAL:
Full cell control automation with .NETMF microcontroller
600A n-Channel PFETs array for PWM control
4 x temperature sensors
current sensor
battery voltage sensing (for automatic power up/down)
Barometric pressure / temperature sensor = altitude calculation
approximation of HHO productivity
gas leakage sensor
a hack of a lot more features...
+ Electronic GAS MASS FLOW METER!!!

CURRENT PRODUCTIVITY DATA:

LPM - 5.50
MMW - 4.84
Normalized mL -5409.29
Normalized LPM - 5.41
Normalized MMW - 4.76
Faraday Maximum Hydrogen - 5027.46
Faraday Maximum Oxygen - 2513.73
Faraday Maximum HHO - 7541.19
Faraday Maximum LPM - 7.54
Faraday Maximum MMW - 6.64
Voltage Per Cell - 1.75
Amps Per Cell - 10.00
Ohms Per Cell - 0.17
Current Density A/sq in - 0.1120
Current Efficiency - 72.93%
Voltage Efficiency - 84.68%