Difference between revisions of "Electric charge"
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(* reordered in a more logical manner (generation, storage, consumption). * wording and stuff.) |
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{{:Electric charge/Box}} | {{:Electric charge/Box}} | ||
| − | '''Electric charge''', also called '''electricity''' or '''energy''', is a [[resource]] that is needed to operate various parts in the game. It is critical for unmanned spacecraft, which are generally uncontrollable without any electric charge. | + | '''Electric charge''', also called '''electricity''' or '''energy''', is a [[resource]] that is needed to operate various parts in the game. It is critical for unmanned spacecraft, which are generally uncontrollable without any electric charge. However, manned spacecraft usually also need some electricity, mainly for [[reaction wheel]]s. |
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== Sources == | == Sources == | ||
| + | === Engines === | ||
| + | Many [[Rocket engine|rocket]]] and [[jet engine]]s can produce electricity. The exact output varies based on throttle level, and engines not running will not produce any electricity. The adjacent table shows the engines which provide electricity and their production at full throttle. Jet engines only generate electricity when supplied with [[intake air]]. | ||
| − | + | {| class="wikitable sortable" style="text-align:center; float:right; margin-left:0.5em;" | |
| − | {|class="wikitable" style="text-align:center; float:right; margin-left:0.5em;" | + | !Type |
| − | ! | + | !Name |
| − | ! | + | !Output |
| − | ! | ||
|- | |- | ||
| rowspan="5" | Rocket Engines | | rowspan="5" | Rocket Engines | ||
| [[LV-T30 Liquid Fuel Engine]] | | [[LV-T30 Liquid Fuel Engine]] | ||
| − | | 1.0/s | + | | 1.0/s |
|- | |- | ||
| [[LV-T45 Liquid Fuel Engine]] | | [[LV-T45 Liquid Fuel Engine]] | ||
| − | | 1.0/s | + | | 1.0/s |
|- | |- | ||
| [[Rockomax "Poodle" Liquid Engine]] | | [[Rockomax "Poodle" Liquid Engine]] | ||
| Line 41: | Line 34: | ||
| 1.0/s | | 1.0/s | ||
|} | |} | ||
| − | |||
| − | |||
=== Solar panels === | === Solar panels === | ||
| Line 49: | Line 40: | ||
Solar panels are a lightweight source of electrical energy. However, they need direct sunlight to work, so they won't produce electricity on the night side of a planet, in the shadow of a spacecraft or during eclipses of the sun, although the craft is illuminated while in an eclipse. Due to this unreliability, it is recommended to have some energy storage as a buffer when supplying a craft solely with solar panels. | Solar panels are a lightweight source of electrical energy. However, they need direct sunlight to work, so they won't produce electricity on the night side of a planet, in the shadow of a spacecraft or during eclipses of the sun, although the craft is illuminated while in an eclipse. Due to this unreliability, it is recommended to have some energy storage as a buffer when supplying a craft solely with solar panels. | ||
| − | All panels except for the [[OX-STAT Photovoltaic Panels]] need to be extended using the right-click menu or action groups before they will generate energy. Unpacked solar panels are very fragile and will | + | All panels except for the [[OX-STAT Photovoltaic Panels]] need to be extended using the right-click menu or action groups before they will generate energy. Unpacked solar panels are very fragile and will easily break off when colliding or experiencing atmospheric drag, so they must be retracted during liftoff, [[aerobraking]], or atmospheric re-entry. |
| − | The energy output of solar panels depends on their orientation to | + | The energy output of solar panels depends on their orientation to [[Kerbol]]. Except for the surface-mounted [[OX-STAT Photovoltaic Panels]], all panels will automatically pivot around one axis to face the sun as much as possible. Reorienting a vessel to manually aim the panels at the sun and eliminate shadows cast on them will also improve power generation. |
| − | Generated power will also decrease with increasing distance from | + | Generated power will also decrease with increasing distance from Kerbol, but rather than following the real-life inverse-square law it experiences a spline curve of 3 piecewise cubics defined from 4 points: |
{| class="wikitable" | {| class="wikitable" | ||
! Distance (m) | ! Distance (m) | ||
! Power | ! Power | ||
| − | ! | + | ! Example |
|- | |- | ||
| 0 | | 0 | ||
| Line 66: | Line 57: | ||
| 13,599,840,256 | | 13,599,840,256 | ||
| 1x | | 1x | ||
| − | | Kerbin's orbit | + | | [[Kerbin]]'s orbit |
|- | |- | ||
| 68,773,560,320 | | 68,773,560,320 | ||
| Line 78: | Line 69: | ||
=== Radioisotope thermoelectric generator === | === Radioisotope thermoelectric generator === | ||
| − | |||
The [[PB-NUK Radioisotope Thermoelectric Generator]] is a constant and reliable source of energy which doesn't require any sunlight and is much more resistant to atmospheric drag than solar arrays. Unfortunately it has a very unpractical shape and is significantly heavier than solar panels with a comparable output of electricity. | The [[PB-NUK Radioisotope Thermoelectric Generator]] is a constant and reliable source of energy which doesn't require any sunlight and is much more resistant to atmospheric drag than solar arrays. Unfortunately it has a very unpractical shape and is significantly heavier than solar panels with a comparable output of electricity. | ||
=== Launch Clamps === | === Launch Clamps === | ||
| − | |||
[[TT18-A Launch Stability Enhancer]]s provide attached craft with 1.0 charge units per second per clamp and thus prevent running out of energy on the launch pad. | [[TT18-A Launch Stability Enhancer]]s provide attached craft with 1.0 charge units per second per clamp and thus prevent running out of energy on the launch pad. | ||
== Storage == | == Storage == | ||
| − | |||
Storing electric charge helps a craft survive longer without energy supply, deal with peak loads (such as the use of ion engines) or bridge time gaps when solar panels aren't usable. The following parts store energy: | Storing electric charge helps a craft survive longer without energy supply, deal with peak loads (such as the use of ion engines) or bridge time gaps when solar panels aren't usable. The following parts store energy: | ||
* Unmanned [[command module]]s offer very low capacities and constantly consume energy. | * Unmanned [[command module]]s offer very low capacities and constantly consume energy. | ||
| − | * Manned command modules offer significant storage capacities and do not consume energy (unless | + | * Manned command modules offer significant storage capacities and do not consume energy (unless when reaction wheels or [[SAS]] are used) but are relatively large and heavy. |
* Batteries are small and offer high storage capacities at the same time. | * Batteries are small and offer high storage capacities at the same time. | ||
* The [[Probodobodyne RoveMate]] functions like a large low-capacity battery. | * The [[Probodobodyne RoveMate]] functions like a large low-capacity battery. | ||
| Line 96: | Line 84: | ||
=== Batteries === | === Batteries === | ||
| − | The available batteries have all the same capacity/mass ratio of 50 g/E or 20 E/kg. | + | The available batteries have all the same capacity/mass ratio of 50 g/E or 20 E/kg. |
| + | |||
| + | == Consumption and requisition == | ||
| + | Unmanned [[command module]]s constantly use 1.7 or 3.0 units of Electric Charge per minute but can only store enough internally for a few minutes of operation. [[Light]]s and [[environmental sensor]]s use small quantities of electricity when switched on. [[Ion engine]]s, reaction wheels, SAS and [[rover]] wheels require particularly large amounts of electricity to operate. | ||
| + | |||
| + | If an unmanned craft has no electric charge available, it becomes entirely nonfunctional and no parts may be operated (notably, this includes motorized solar panels which might have allowed it to recover). However, it can still be saved if another craft dochs to it and supplies it with electricity, or if a [[kerbonaut]] on [[EVA]] manually extends the solar panels. | ||
[[Category:Resources]] | [[Category:Resources]] | ||
Revision as of 21:55, 21 August 2013
| Electric charge | ||
| Density | None | |
| Transferable | Yes | |
| Tweakable | Yes | |
| Drainable | No | |
| Flow mode | Everywhere | |
| Cost | None | |
| Since version | 0.18 | |
Electric charge, also called electricity or energy, is a resource that is needed to operate various parts in the game. It is critical for unmanned spacecraft, which are generally uncontrollable without any electric charge. However, manned spacecraft usually also need some electricity, mainly for reaction wheels.
Contents
Sources
Engines
Many rocket] and jet engines can produce electricity. The exact output varies based on throttle level, and engines not running will not produce any electricity. The adjacent table shows the engines which provide electricity and their production at full throttle. Jet engines only generate electricity when supplied with intake air.
| Type | Name | Output |
|---|---|---|
| Rocket Engines | LV-T30 Liquid Fuel Engine | 1.0/s |
| LV-T45 Liquid Fuel Engine | 1.0/s | |
| Rockomax "Poodle" Liquid Engine | 1.0/s | |
| Rockomax "Skipper" Liquid Engine | 2.0/s | |
| Rockomax "Mainsail" Liquid Engine | 2.0/s | |
| Jet Engines | Basic Jet Engine | 0.8/s |
| TurboJet Engine | 1.0/s |
Solar panels
Solar panels are a lightweight source of electrical energy. However, they need direct sunlight to work, so they won't produce electricity on the night side of a planet, in the shadow of a spacecraft or during eclipses of the sun, although the craft is illuminated while in an eclipse. Due to this unreliability, it is recommended to have some energy storage as a buffer when supplying a craft solely with solar panels.
All panels except for the OX-STAT Photovoltaic Panels need to be extended using the right-click menu or action groups before they will generate energy. Unpacked solar panels are very fragile and will easily break off when colliding or experiencing atmospheric drag, so they must be retracted during liftoff, aerobraking, or atmospheric re-entry.
The energy output of solar panels depends on their orientation to Kerbol. Except for the surface-mounted OX-STAT Photovoltaic Panels, all panels will automatically pivot around one axis to face the sun as much as possible. Reorienting a vessel to manually aim the panels at the sun and eliminate shadows cast on them will also improve power generation.
Generated power will also decrease with increasing distance from Kerbol, but rather than following the real-life inverse-square law it experiences a spline curve of 3 piecewise cubics defined from 4 points:
| Distance (m) | Power | Example |
|---|---|---|
| 0 | 10x | |
| 13,599,840,256 | 1x | Kerbin's orbit |
| 68,773,560,320 | 0.5x | Jool's semi-major axis |
| 206,000,000,000 | 0x | Almost 3x Jool's orbit |
Radioisotope thermoelectric generator
The PB-NUK Radioisotope Thermoelectric Generator is a constant and reliable source of energy which doesn't require any sunlight and is much more resistant to atmospheric drag than solar arrays. Unfortunately it has a very unpractical shape and is significantly heavier than solar panels with a comparable output of electricity.
Launch Clamps
TT18-A Launch Stability Enhancers provide attached craft with 1.0 charge units per second per clamp and thus prevent running out of energy on the launch pad.
Storage
Storing electric charge helps a craft survive longer without energy supply, deal with peak loads (such as the use of ion engines) or bridge time gaps when solar panels aren't usable. The following parts store energy:
- Unmanned command modules offer very low capacities and constantly consume energy.
- Manned command modules offer significant storage capacities and do not consume energy (unless when reaction wheels or SAS are used) but are relatively large and heavy.
- Batteries are small and offer high storage capacities at the same time.
- The Probodobodyne RoveMate functions like a large low-capacity battery.
All energy storage available to a craft is fully loaded at launch.
Batteries
The available batteries have all the same capacity/mass ratio of 50 g/E or 20 E/kg.
Consumption and requisition
Unmanned command modules constantly use 1.7 or 3.0 units of Electric Charge per minute but can only store enough internally for a few minutes of operation. Lights and environmental sensors use small quantities of electricity when switched on. Ion engines, reaction wheels, SAS and rover wheels require particularly large amounts of electricity to operate.
If an unmanned craft has no electric charge available, it becomes entirely nonfunctional and no parts may be operated (notably, this includes motorized solar panels which might have allowed it to recover). However, it can still be saved if another craft dochs to it and supplies it with electricity, or if a kerbonaut on EVA manually extends the solar panels.
