bobbycar/akkuconfig/akkupack_config.py

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#!/usr/bin/env python3
import numpy as np
import csv
import itertools
import math
#https://stackoverflow.com/questions/5360220/how-to-split-a-list-into-pairs-in-all-possible-ways
def all_pairs(lst):
if len(lst) < 2:
yield lst
return
a = lst[0]
for i in range(1,len(lst)):
pair = (a,lst[i])
for rest in all_pairs(lst[1:i]+lst[i+1:]):
yield [pair] + rest
column_label=0
column_capacity=3
column_resistance=4
config_parallel=2
config_cells=12
#config_parallel*config_cells*config_packs needed
batteriesneeded=config_parallel*config_cells
batteries=[]
batterylabels=[]
with open('12S_LiIon_Akkupack_selected.csv', 'r') as csvfile:
csvreader = csv.reader(csvfile, delimiter=';')
firstrow=True
for row in csvreader:
label=row[column_label]
capacity=row[column_capacity]
resistance=row[column_resistance]
if not firstrow:
capacity=float(capacity)
resistance=float(resistance)
batteries.append([label,capacity,resistance])
batterylabels.append(label)
firstrow=False
print(str(len(batteries))+" Batteries found")
if len(batteries)==batteriesneeded:
print("You have just enough batteries")
elif len(batteries)>batteriesneeded:
print("You have "+str(len(batteries)-batteriesneeded)+" batteries spare")
elif len(batteries)<batteriesneeded:
print("You need "+str(batteriesneeded-len(batteries))+" more batteries!")
exit()
#batteries=[["a",1],["b",2],["c",3],["d",4],["e",5],["f",6]]
bestcombination=[]
bestdist=100000000
combinations=all_pairs(batteries)
num_combinations=0
#print("Counting combinations")
#for i in combinations: #just count the combinations
# num_combinations+=1
print(str(num_combinations)+" combinations possible")
#evaluate combinations
count=0
for i in combinations: #every combinations
count+=1
if count%1000000==0:
print(str(count)+"/"+str(num_combinations))
seriescapacities=[]
for s in i: #all series
parallelcapacity=0
for p in s: #all parallels
parallelcapacity+=p[1]
seriescapacities.append(parallelcapacity)
meancapacity=np.mean(seriescapacities)
dist=0
for c in seriescapacities:
dist+=math.pow(abs(c-meancapacity),2)
if dist<bestdist:
print(str(count)+"/"+str(num_combinations)+" New Best with distance "+str(dist))
bestdist=dist
bestcombination=i
print("## Combination ##")
for i in bestcombination:
print(i)
print("## ----------- ##")
print("")
print("best combination with "+str(bestdist)+" distance:")
#print(bestcombination)
for i in bestcombination:
print(i)