## Accumulator / Solar panel ratio

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DaveMcW
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### Re: Accumulator / Solar panel ratio

creepercrack wrote:I did this to simplify the math
You simplified it too much. The first 30% of dawn and dusk do not require accumulators, because they are producing more than 42kW.
accumulator.png (12.42 KiB) Viewed 3597 times
If you cut out the green regions, it reduces the accumulator power needed to only 100 seconds, not 125.

creepercrack
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### Re: Accumulator / Solar panel ratio

DaveMcW wrote:
creepercrack wrote:I did this to simplify the math
You simplified it too much. The first 30% of dawn and dusk do not require accumulators, because they are producing more than 42kW.
accumulator.png
If you cut out the green regions, it reduces the accumulator power needed to only 100 seconds, not 125.
Now I see it, I was wrong, thanks!

AJaromir
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### Re: Accumulator / Solar panel ratio

Looks like in this thread will be someone who will help me.

I am just testing Solar/accumulator ratio alchemy with 20 radars. Radars have constant power usage so they are good for testing.

20 radars have 6 MW power usage. That means I need 100KJ for every game tick.
If my calculations are right, then I need 150 accumulators to keep it working in night. (100 KJ x 7500 ticks = 750 MJ -> 750 MJ /5 MJ = 150 accumulators)

To test if it's the right value, I pre-charged them with 100 solar panels which generates just 6MW -> same power like needed by 20 radars. After the cells were fully charged, I connected radars to the circuit with 100 solar panels and 150 pre-charged accumulators in mid-day.
Then something strange happened. Even the everything was balanced, about first 4 seconds the radars used the energy stored in accumulators instead of solar panels, so I had to add one solar panel for a short time to refill the accumulators to full capacity again.

The first test passed. The radars worked on 100% for the whole night and the stored power at the end of dawn was 0J. The second test was without re-charging accumulators after connecting radars. This one almost passed. There was just for less than 1 second 5.98 MW power usage.

So, let's continue.
I just need to generate the 2500 MJ during the whole daytime. -> 2500 MJ / 17500 game ticks = 142+(6/7) KJ per game tick. (142+(6/7)) KJ * 60 game ticks = 8571+(3/7) KW -> / 60 = 142+(6/7) solar panels which is just rounded 143 solar panels.

Now the practice test which have the different result:
Looks like the 143 solar panels is good number because the accumulators are accumulating or discharging almost continuously for almost 100% of daytime and the accumulators are always charged to 100%. BUT I've found that I have 150MJ of useless reverse which is just 30 accumulators. So In the end I just need only 120 accumulators instead of 150. And this is where I am getting lost in my math.

Edit. I think I am getting it. Because there is more solar panels, the energy production during dawn and dusk is higher so less accumulators is needed. Easy to calculate.

Edit 2 - the final result (yeah, finally! ):

For 6 MW power consumption we need exactly:
8571+(3/7) KW solar panels
600 MJ capacity of accumulators

So, the result is we need 25/21 (= 1.190476^_ (period 6)) more solar panels than accumulators. Or we can say we need 21/25 (=0,84) accumulators per solar panel. Or we can say we need 25 solar panels per 21 accumulators. So the OP post is 100% accurate.

BurritoBotV3000
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### Re: Accumulator / Solar panel ratio

Greetings, AI's of factorio, I have something for you, this is my first post. this post is a blueprint for the solar farm in the picture. Enjoy!

ownlyme
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### Re: Accumulator / Solar panel ratio

from my ingame tests (0.18) it seems to be slightly more than 0.84, more like 0.8407 ...
and your base may only consume 69.99% of your solar panel's production
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### Re: Accumulator / Solar panel ratio

ownlyme wrote:
Sun Feb 16, 2020 7:29 pm
from my ingame tests (0.18) it seems to be slightly more than 0.84, more like 0.8407 ...
and your base may only consume 69.99% of your solar panel's production
Tests vs Math... Good luck.

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