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USI Life Support is a simplified life support system. It can be used by itself, or together with [USI Kolonization System] (https://github.com/BobPalmer/MKS/wiki). USI Life Support allows you to simulate your Kerbals needing resources to stay alive, and consequences for running out of those resources.
Configuration options are details on the configuration (https://github.com/BobPalmer/MKS/wiki/Configuration) page. It is recommended you use the defaults until you become familiar with USI Life Support. To try out USI Life Support without any negative consequences for failure, see the changes on the configuration page under 'Common Configuration Changes'. You can also make the 'exceptional' Kerbals (orange-suits) immune to negative effects. Doing this while learning will let you rescue stranded Kerbals or avoid some mistakes.
Kerbals need two resources to stay alive and happy: Supplies and Habitation.
Supplies are the abstraction of everything you consume to live: Oxygen, water, food, etc. Habitation is space to live, work, sleep and move around. USI Life Support keeps running time counters for each Kerbal for these resources. If any counter runs out, bad things happen to your Kerbal. In the default install, your Kerbal will become a Tourist; he or she won't be able to do anything until the situation is corrected.
Supplies has a 'grace period'. This is bonus time after the Supplies are used up that you are given. The idea is that your Kerbal can go for a while without food or water. The default value for this is 90 hours (15 Kerbin days, or 3.75 Earth days). During this time your Supply timer will show in negative values.
The habitation countdown timer comes in two types: The current vessel your Kerbal is crewing, and the total amount of time the Kerbal can be away from Kerbin (in other words, on a mission). This will be explained further in the Habitation section.
Supplies, or Nutritional Organic Meal Substitute (N.O.M.S.), are provided by USI Life Support containers. They can be added to your vessel at launch. New supplies can also be created by farming. A single Kerbal consumes .00075 Supplies per second, which is 2.7 Supplies per hour. This is 16.2 Supplies per Kerbin-day. Earth-days are four times longer, so if you are using Earth time, your Kerbals use 64.8 Supplies per (Earth) day. Note that the per-second value is the same.
The other resources involved in using Supplies are:
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ElectricCharge, a stock resource in the game. -
Mulch, a byproduct ofSuppliesconsumption. ExcessMulchis thrown overboard (destroyed) if you do not have a container for holding it. -
Fertilizer, used to produce moreSupplieswhen combined withMulch. Can not be created outside Kerbin, unless you have [USI Kolonization System] (https://github.com/BobPalmer/MKS/wiki) installed.
ElectricCharge is simply the electric charge which is part of the stock game (solar panels, batteries, etc.). Kerbals require 0.01 ElectricCharge per second which is very little. A small battery will keep a Kerbal alive for many, many days.
Kerbals consume Supplies and convert them directly to Mulch:
| Supplies Consumed | Mulch Produced
----------------|-------------------------------|------------------------------ A single Kerbal | 16.2/day (.00075 per second) | 16.2/day (.00075 per second)
Kerbals can go 15 (Kerbin) days without Supplies without incident. After 15 days Kerbals will simply stop working. They'll stay in their seat but they won't EVA, they won't command the ship - they'll act like tourists. Once provided Supplies, they'll return to work. By default this includes exceptional veteran Kerbals (Jeb, Bill, Bob, Valentina - those in orange suits) however you can change this: See the configuration (https://github.com/BobPalmer/MKS/wiki/Configuration) page for details.
Additionally, on Kerbin, Kerbals will not strike if below 25km altitude. They will still consume resources but will happily keep working. Assume they find some berries to eat if they run out of food. No need to manage Supplies for ground bases on Kerbin and low-flying atmospheric craft on Kerbin.
- Life Support MiniPak (Supplies): 100
Supplies, surface mount - Life Support MiniPak (Fertilizer): 100
Fertilizer, surface mount - Life Support MiniPak (Mulch): 100
Mulch, surface mount - Life Support Tank (1.25): 500
Supplies, inline mount - Life Support Tank (2.5): 4,500
Supplies, inline mount - Life Support Tank (3.75): 15,000
Supplies, inline mount - Fertilizer Tank (1.25): 500
Fertilizer, inline mount - Fertilizer Tank (2.5): 4,500
Fertilizer, inline mount - Fertilizer Tank (3.75): 15,000
Fertilizer, inline mount - Nom-O-Matic 5000 Greenhouse: Produces
SuppliesusingMulchandElectricChargeandFertilizer - Nom-O-Matic 25000 Greenhouse: Produces
SuppliesusingMulch,ElectricChargeandFertilizer
Quick Reference for how many days supplies will support a single Kerbal
| Supplies | Kerbin Days | Earth Days |
|---|---|---|
| 100 | 6 | 1.5 |
| 500 | 30 | 7.5 |
| 4,500 | 277 | 69.25 |
| 15,000 | 925 | 231.25 |
Kerbals need a certain amount of space to live in to stay happy, which is called Habitation. Even if a Kerbal has all the requirements to live off Kerbin, it's still not Home. In order to prevent them from getting homesick, you can station them (even briefly) in a well-built vessel designed for Habitation, and/or move them to a different vessel. A Kerbal will count down its time in a single vessel against that vessel's Habitation rating, but this is reset each time it transfers to a different vessel - even if just stretching their legs in the rover and returning! A Kerbal will also count down how long until they get homesick. If they are away longer than the BEST Habitation rating they've ever seen, they will become homesick. This value never resets until they return to Kerbin.
By default a Kerbal is willing to live about a month away from Kerbin before he gets homesick and wants to return. However if he's placed in a well built vessel, he can be tempted to forget about Kerbin for longer periods. If you then move your crew to a smaller, less well built vessel, they'll get upset much more quickly and they'll long to return to the well built vessel.
The Habitation value is tracked as two values:
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A max number of days for the current vessel before a crew member gets upset. There is a counter that tracks against this number that is reset every time a crew member enters a new vessel.
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A total maximum number of days a crew member is willing to be away from Kerbin. The max value for this counter will be set to the largest "current vessel" habitation value that a crew member sees. The max value will only change if the crew member visits a better vessel than the best they've visited so far. The counter for this value never resets until the crew member returns to Kerbin, no matter how many vessels they transfer to.
Habitation is calculated in Kerbal-Months. A part with 1 Kerbal-Month will rather obviously support a single kerbal for one month, or 30 days. Please note this is for Kerbin days. If you play using Earth time, you have longer days, so you have shorter months! One 'Kerbal-Month' using Earth time is 7.5 Earth-days. You can also think of one Kerbal-Month as 180 hours.
Every part that can hold crew will provide one Kerbal-Month per seat, so a Mk1 Command Pod provides 1 Kerbal-Month, while a Mk1-2 Command Pod provides 3 Kerbal-Months. In addition, the stock Hitchhiker Can provides a bonus 12.5 Kerbal-Months (in addition to the 4 kerbal-months provided by its 4 seats) and is excellent for building bases. If you use [USI Kolonization System] (https://github.com/BobPalmer/MKS/wiki), other parts provide bonus Habitation.
Finally, special modules can provide Habitation multipliers. The only stock module which provides a Habitation multiplier is the PPD-12 Cupola. Kerbals get less cranky if they can use huge windows to view the awesomeness of space.
The Kerbal-Months provided by your habitat space is multiplied by the vessel's total Hab Multiplier value. Every vessel has a base Hab Multiplier of 1. Any additional multipliers provided by parts are added to that to get the vessel's final Hab Multiplier. For example, a Cupola has a Hab Multiplier of 1.76. If a vessel has two Cupolae, its final Hab Multiplier is 1 + (1.76 * 2) = 4.52. If the vessel provides a base Habitation of 100 kerbal-months, the Hab Multiplier increases the ship's total Habitation to 452 kerbal-months.
A crew member launches from KSC in a small rocket with a single pod. They initially have a Current Vessel max value of 30 days and a Home max value of 30 days. Each day they spend on that small rocket will be counted against both counters.
He docks after 2 days on to a station with 1 Hitchhiker Can and 1 PPD-12 Coupola. The base has a total of 45.54 Kerbal-Months of habitation: 1 Hitchhiker = 12.5 + 4 seats = 16.5, multiplied by 2.76 (base 1, plus 1.76 for Coupola). Our single Kerbal can spend 1366 days on this station; the the max value for both Current Vessel and Home counters will be increased to 1366. The Current Vessel count for the current vessel will be reset to zero and start counting anew, however the count for Home will remain at 2 days and continue to increment.
If the crew member then transfers to a small Mun Lander (with a habitation value of 45) after being aboard the station for 10 days, then the Current Vessel Max will drop to 45 days, the count for the current vessel will drop to 0, but the Total Time counter will be at 12 days and continue to increase with the max remaining that of the largest vessel they've visited (the 1366 from the station).