Where the Under Current Double Barrel 24 Sits in the Line
Same four rows as the 16, same 13 gallon modules, same 40 in centers. What changes is length, and only length. Rows carry 24 sites instead of 16 and total volume goes to 290 gallons. The footprint stretches to 12 ft 10 in by 20 ft 10.5 in. Width holds steady across the whole XXL13 line, and that is the useful part. A room already laid out for the 16 site version usually takes the 24 by finding another seven feet down one axis. Aisle width does not change.
Running a Commercial RDWC System at 24 Sites
Volume is what changes the daily routine. Two hundred and ninety gallons is a slower, steadier body of water than 200. It forgives pH and EC drift, and it does not forgive a mistake you dose straight in. Circulation comes from an 1,800 GPH Mag-Drive turning the system over about 6.5 times an hour. Chiller sizing moves up to 1 to 1.5 HP, and the top-off reservoir to 300 gallons. Plan an 18 x 28 ft grow area, lit by 24 x 600W horizontal or 31 x 600W vertical. Veg still runs 4 to 6 weeks to 30 to 36 in. Every module feeds from the same recirculating solution. A commercial rdwc system at this size is still one reservoir to read, correct and flush. That is the whole argument for running four rows off a shared loop rather than four independent ones.
Key Features
- 24 sites across four rows: Eight more sites than the 16 on the same width, gained by extending row length.
- 290 gallon shared solution: A larger water body rides out pH and EC swings that would move a smaller system.
- 40 in centers on 13 gallon modules: XXL13 spacing, matching the rest of the line for fewer and larger plants.
- 12 ft 10 in x 20 ft 10.5 in footprint: Same width as the 16 site, so a room often takes it with length alone.
- 1,800 GPH return pump: Roughly 6.5 full system exchanges every hour through the 3 in manifold.
Technical Specifications
| Specification | Value |
|---|---|
| Model | UCDB24XXL13, Under Current Double Barrel XXL13 |
| Number of Rows | 4 |
| Number of Sites | 24 |
| Plant Spacing | 40 in centers |
| Module Size | 13 Gallon Blackout Series |
| System Footprint | 12 ft 10 in x 20 ft 10.5 in (3.91 m x 6.36 m) |
| Total System Volume | 290 gal / 1,098 L |
| Water Pump | 1,800 GPH / 6,814 LPH Danner Mag-Drive |
| Recirculation Rate | Approx 6.5 exchanges per hour |
| Recommended Grow Area | 18 ft x 28 ft (5.49 m x 8.53 m) |
| Lighting - Horizontal | 24 x 600W |
| Lighting - Vertical | 31 x 600W |
| Chiller Size | 1 to 1.5 HP (confirm with chiller manufacturer) |
| Reservoir | 300 gal / 1,200 L |
| Veg Time | 4-6 weeks to 30-36 in |
| Warranty | 1 year |
What Ships With the System
- 13 Gallon Blackout Series growth modules, with CCH2O 8 in heavy duty lids and net pots.
- 3 in manifold and joints with 3 in UC Spin-Tight bulkheads, plus a Danner Mag-Drive return pump.
- Premium linear air pumps, 9 in air diffuser disc, Aqua-Pore air diffusers, air distribution manifold, air hose and in-line filters.
- Adjustable float valve with reservoir adapter kit, drain valve, chiller adapter and garden hose drain adapter.
- Cultured Solutions VEG A/B, and a 1-year warranty.