Large Reactor
| Large Reactor | |
|---|---|
| |
| Category: | Power |
| Function: | generates power |
| Fits small grid | |
| Mass: | 3901.0 kg |
| PCU: | 25 |
| Size: | 3x3x3 |
| Time to Build: | 30 sec |
| Fits large grid | |
| Mass: | 73795.0 kg |
| PCU: | 25 |
| Size: | 3x3x3 |
| Time to Build: | 100 sec |
| Data Controls: | [edit] [purge] (?) |
The 
Large Reactor is a power production block in Space Engineers. This generator has the highest power output rate.
The 
Large Warfare Reactor is a visual variant with the same functionality and same recipe; you need the Warfare 2 Pack DLC to build it.
Usage
Use the Large Reactor to generate power from uranium. The reactor has no settings other than on or off.
Comparison
The Large Reactor is more efficient (MW/kg) by about 1.326 times (on a large-grid ship). On a small-grid ship, a Large Reactor produces about 1.639 times more power per kg Uranium ingots than a small one.
One Uranium ingot (1 kg) at full power usage (300MW) last 12 seconds. This means the consumption of uranium can be calculated as 1 MWh per 1 Kg of uranium ingots. This applies to all sizes of reactors on both small and large grid ships.
Inventory
With Realistic settings, the Large Reactor has an inventory with a capacity of 1,000L for small ships and 8,000L for large ships. The inventory only accepts 
Uranium Ingots as fuel. If any of the inventory ports are attached to a conveyor system, the reactor will automatically attempt to pull Uranium Ingots when it runs low.
Power
You must place Uranium Ingots into the reactor's inventory for it to generate power in survival mode. In Creative Mode, no Uranium is used up to generate power, but the maximum output stays the same.
Grids draw power from reactors only if the output of renewable power providers (such as Solar Panels, Wind turbines) is not sufficient. This ensures that no Uranium is wasted.
- Max output on a large-grid ship or station: 300 MW
- Max output on a small-grid ship: 10.5 MW
Troubleshooting
If the Large Reactor does not produce any power, first make sure its inventory contains (or is conveyored to an inventory containing) Uranium Ingots.
Despite being a power producing block, the Large Reactor depends on the conveyor system to pull fuel. A completely "dead" ship will require some other temporary source of power (e.g. a temporary solar panel) to jump-start the conveyor systems. Or at least you need direct access to one reactor to feed it manually with uranium ingots.
Construction
If progression is enabled, build a 
Basic Refinery first to unlock it.
Large Reactors have two conveyor ports on neighouring sides and they have mount points only on these two sides. They are not airtight.
You can build Large Reactors on large and small grids. Both are 3x3x3 blocks in size:
- Large Reactor for large ships measures 7.5m x 7.5m x 7.5m
- Large Reactor for small ships measures 1.5m x 1.5m x 1.5m
A 
Small Reactors is a different block from a Large Reactor on a small ship.
The Large Reactor is twenty-seven times the size of the Small Reactor (3x3x3 instead of 1x1x1).
Recipe
| Large Reactor | ||||
|---|---|---|---|---|
| Component | Large Ship/Station Required | Large Ship/Station Optional | Small Ship Required | Small Ship Optional |
 Superconductor | 100 | — | — | — |
 Steel Plate | 800 | 200 | 40 | 20 |
 Reactor Comp. | 2000 | — | 95 | — |
 Motor | 20 | — | 5 | — |
 Metal Grid | 40 | — | 9 | — |
 Large Steel Tube | 40 | — | 3 | — |
 Construction Comp. | 70 | — | 9 | — |
 Computer | 75 | — | 25 | — |
