The '''Accumulator''' stores a limited amount of energy when available production exceeds demand, and releases it in the opposite case. The accumulator can store up to 5 MJ of energy. Its charge/discharge rate is 300 kW maximum.
* 5MJ of stored energy takes approximately 17s to fully charge/discharge at the maximum rate of 300kW. Read [[Game-second]] for further time related calculations.
* It takes 20 accumulators (100MJ) to maintain 1MW through the night, because the accumulators don't immediately start discharging at the beginning of dusk, see the graph in [https://forums.factorio.com/viewtopic.php?f=5&t=5594 this post.]
* When discharged above maximum speed by multiple unconnected poles, energy will not be distributed equally (some loads may get 100% demand, others 0%)
* Can act to satisfy surging demands of certain loads. If the power usage of one device exceeds production for a few seconds or so, the accumulator can provide power to the grid until said device shuts down or requires a lesser power requirement.
[[Electric system#Storage|Accumulator]]s can be used to isolate two separate power networks, which has a number of uses. Since accumulators have a lower delivery priority than any other entity, this guarantees that they only receive energy when you have enough left over after powering all other entities in a network. At the same time, accumulators can also be used to deliver energy in another electrical network, and can charge and discharge at the same time. Consider the following example:
The two power networks A and B are not directly connected to each other: They are connected only through the accumulators, which are shared by both networks. This is accomplished by setting up electric poles for each network connected to the accumulators, then ensuring the sets of poles are not connected to each other (which can be done by crafting a copper wire then dragging it between two connected poles to sever the connection, exactly as is done for disconnecting circuit wires).
* The accumulators will only charge if extra power is being produced by network A or B.
* 蓄電池はネットワークAかBで余剰電力が生じた場合に充電される
* The accumulators will discharge as needed into either network if one is not producing enough power.
* どちらかのネットワークで十分な電力が生産されない場合に必要に応じて放電する
* Since the maximum input/output rate of an accumulator is 300 kW, power flow between the two networks will be limited to 300 kW times the number of accumulators (1.5 MW in the example).
This technique can be used whenever this type of isolation is desired.
このテクニックはこうした分割が望ましい場合いつでも利用できる。
==== Reduction of Energy Consumption in Critical Situations ====
==== 危機的状況でのエネルギー消費軽減 ====
In particular, one good use for the above technique is to limit electricity consumption in low power situations by isolating non-critical parts of your factory (such as [[Radar]], [[Lab]]s, [[Electric furnace]]s, [[Electric mining drill|electric miner]]s, [[Beacon]]s, etc.) from critical parts (such as lasers, ammo production, or whatever your priorities are).
To do this, place your main generators and critical components on one network and place your non-critical components on another network, isolating the two as above. Now, two things will happen:
* Power will ''only'' flow to the non-critical network when you are generating a surplus on the main network, and
* 電源は主ネットワークの電源供給に余剰がある時''のみ''非クリティカルネットワークへ流入し、
* The rate will always be limited to 300 kW per accumulator.
* その速度は蓄電池ごと300kWに制約される。
Because the accumulators will only receive power if you have a surplus on the main network, this will in effect deactivate the low-priority network when electricity is in short supply. This will also limit power consumption of the low priority network if its usage becomes high, for example if you have two factories on a low priority network and usually only one of them runs at a time, if both happen to run they won't consume more than the total limit, they'll just slow down.
In general this is a technique which works well when you've just researched accumulators and solar panels, but don't have enough resources to build big solar farms and accumulator farms yet.
[[File:electrical-network-example-2.png|frame|384px|High density accumulator array consisting of 48 accumulators and a [[Substation]] providing 240 MJ capacity.]]
== History ==
== 関連項目 ==
* [[Electric system/ja|電気システム]]
{{history|0.13.3|
* [[Solar panel/ja|ソーラーパネル]]
* Reduced collision box of [[big electric pole]] to allow squeezing between it and an accumulator.}}
* [[Power production/ja|電力生産]]
* [[Game-day/ja|ゲーム日]]
{{history|0.13.0|
* Now connectible to the circuit network.}}
{{history|0.12.0|
* Heavy optimisations by merging them into groups.}}
