def vd(amperage, length, size=None, v=240, pf=-1, t_amb=30, percent=1, material="CU", c="STEEL", verbose=True):
"""Solve for conductor voltage drop.
>>> print vd(10,100)
Allowed Voltage drop: 2.4V
Conductor 10 CU
Drop: 2.08 V
10 CU
>>> print vd(10,100,'8')
Percent drop: 0.56%
8 CU
"""
oc = amperage * 1.25
ocp = ee.ocp_size(oc)
vdrop = v * percent / 100.0
if size:
conductor = ee.Conductor(size, material)
conductor = ee.check_ampacity(conductor, ocp, t_amb)
vdrop = conductor.vd(amperage, length, v=v, pf=pf, t_amb=t_amb, c=c)
vdp = vdrop * 100 / v
if verbose:
print "Percent drop: %s%%" % round(vdp, 2)
return conductor
else:
if verbose:
print "Allowed Voltage drop: %sV" % vdrop
sets = 0
conductor = None
# todo: refactor for recursive. may take away the need for nec import
while conductor is None:
sets += 1
for s in nec.CONDUCTOR_STANDARD_SIZES:
# print s, material
conductor = ee.Conductor(s, material)
# print conductor
if conductor.vd(amperage * 1.0 / sets, length, v=v, pf=pf, t_amb=t_amb, c=c) < vdrop:
break
else:
conductor = None
if sets > 1:
print "%s sets of %s" % (sets, conductor)
# print "EGC Size: %s" % incEGC(conductor,egc,ratio)
return [conductor] * sets
# return [conductor for i in range(sets)]
else:
if verbose:
print "Conductor %s" % conductor
conductor = ee.check_ampacity(conductor, ocp / sets, t_amb)
if verbose:
print "Drop: %s V" % round(conductor.vd(amperage * 1.0 / sets, length, v=v, pf=pf, t_amb=t_amb, c=c), 2)
return conductor
def write_notes(system, filename='output', v_nominal=240.0):
"""file out expedited permit form with system details"""
station_class = 1
dummy, usaf = geo.closest_usaf(geo.zip_coordinates(system.zipcode), \
station_class)
mintemp = eere.minimum(usaf)
twopercent_temp = eere.twopercent(usaf)
fields = []
for i in set(system.shape):
module_name = i.array.dump()['panel']
module = modules.Module(module_name)
print "PV Module Ratings @ STC"
print "Module Make:", module.make
fields.append(('Text1ModuleMake', module.make))
print "Module Model:", module.model
fields.append(('Text1ModuleModel', module.model))
print "Max Power-Point Current (Imp):", module.i_mpp
fields.append(('MAX POWERPOINT CURRENT IMP', module.i_mpp))
print "Max Power-Point Voltage (Vmp):", module.v_mpp
fields.append(('MAX POWERPOINT VOLTAGE VMP', module.v_mpp))
print "Open-Circuit Voltage (v_oc):", module.v_oc
fields.append(('OPENCIRCUIT VOLTAGE VOC', module.v_oc))
print "Short-Circuit Current (i_sc):", module.i_sc
fields.append(('SHORTCIRCUIT CURRENT ISC', module.i_sc))
fields.append(('MAX SERIES FUSE OCPD', '15'))
print "Maximum Power (p_max):", module.p_max
fields.append(('MAXIMUM POWER PMAX', module.p_max))
print "Module Rated Max Voltage:", module.Vrated
fields.append(('MAX VOLTAGE TYP 600VDC', module.Vrated))
fields.append(('VOC TEMP COEFF mVoC or oC', round(module.tk_v_oc, 2)))
fields.append(('VOC TEMP COEFF mVoC', 'On'))
print "Inverter Make:", i.make
fields.append(('INVERTER MAKE', i.make))
print "Inverter Model:", i.model
fields.append(('INVERTER MODEL', i.model))
print "Max Power", i.p_aco
fields.append(('MAX POWER 40oC', i.p_aco))
fields.append(('NOMINAL AC VOLTAGE', 240))
print "Max AC Current: %s" % round(i.p_aco/v_nominal, 2)
fields.append(('MAX AC CURRENT', round(i.p_aco/v_nominal, 2)))
fields.append(('MAX DC VOLT RATING', i.mppt_hi))
print "Max AC OCPD Rating: %s" % ee.ocp_size(i.p_aco/v_nominal*1.25)
print "Max System Voltage:", round(module.v_max(mintemp), 1)
print "AC Output Current: %s" % \
round(sum([i.p_aco for i in system.shape])/v_nominal, 2)
fields.append(('AC OUTPUT CURRENT', \
round(sum([i.p_aco for i in system.shape])/v_nominal, 2)))
print "Nominal AC Voltage: %s" % v_nominal
fields.append(('NOMINAL AC VOLTAGE_2', i.ac_voltage))
print "Minimum Temperature: %s C" % mintemp
print "2 Percent Max: %s C" % twopercent_temp
from fdfgen import forge_fdf
fdf = forge_fdf("", fields, [], [], [])
fdf_file = open("data.fdf", "w")
fdf_file.write(fdf)
fdf_file.close()
import shlex
from subprocess import call
cmd = shlex.split("pdftk Example2-Micro-Inverter.pdf fill_form data.fdf" \
"%s output.pdf flatten" % filename)
rc = call(cmd)
return rc
def vd(amperage,
length,
size=None,
v=240,
pf=-1,
t_amb=30,
percent=1,
material='CU',
c='STEEL',
verbose=True):
"""Solve for conductor voltage drop.
>>> print vd(10,100)
Allowed Voltage drop: 2.4V
Conductor 10 CU
Drop: 2.08 V
10 CU
>>> print vd(10,100,'8')
Percent drop: 0.56%
8 CU
"""
oc = amperage * 1.25
ocp = ee.ocp_size(oc)
vdrop = v * percent / 100.0
if size:
conductor = ee.Conductor(size, material)
conductor = ee.check_ampacity(conductor, ocp, t_amb)
vdrop = conductor.vd(amperage, length, v=v, pf=pf, t_amb=t_amb, c=c)
vdp = (vdrop * 100 / v)
if verbose:
print "Percent drop: %s%%" % round(vdp, 2)
return conductor
else:
if verbose:
print "Allowed Voltage drop: %sV" % vdrop
sets = 0
conductor = None
# todo: refactor for recursive. may take away the need for nec import
while conductor is None:
sets += 1
for s in nec.CONDUCTOR_STANDARD_SIZES:
# print s, material
conductor = ee.Conductor(s, material)
# print conductor
if conductor.vd(amperage * 1.0 / sets,
length,
v=v,
pf=pf,
t_amb=t_amb,
c=c) < vdrop:
break
else:
conductor = None
if sets > 1:
print "%s sets of %s" % (sets, conductor)
# print "EGC Size: %s" % incEGC(conductor,egc,ratio)
return [conductor] * sets
# return [conductor for i in range(sets)]
else:
if verbose:
print "Conductor %s" % conductor
conductor = ee.check_ampacity(conductor, ocp / sets, t_amb)
if verbose:
print "Drop: %s V" % round(
conductor.vd(amperage * 1.0 / sets,
length,
v=v,
pf=pf,
t_amb=t_amb,
c=c), 2)
return conductor
def write_notes(system, filename='output', v_nominal=240.0):
"""file out expedited permit form with system details"""
station_class = 1
dummy, usaf = geo.closest_usaf(geo.zip_coordinates(system.zipcode), \
station_class)
mintemp = eere.minimum(usaf)
twopercent_temp = eere.twopercent(usaf)
fields = []
for i in set(system.shape):
module_name = i.array.dump()['panel']
module = modules.Module(module_name)
print "PV Module Ratings @ STC"
print "Module Make:", module.make
fields.append(('Text1ModuleMake', module.make))
print "Module Model:", module.model
fields.append(('Text1ModuleModel', module.model))
print "Max Power-Point Current (Imp):", module.i_mpp
fields.append(('MAX POWERPOINT CURRENT IMP', module.i_mpp))
print "Max Power-Point Voltage (Vmp):", module.v_mpp
fields.append(('MAX POWERPOINT VOLTAGE VMP', module.v_mpp))
print "Open-Circuit Voltage (v_oc):", module.v_oc
fields.append(('OPENCIRCUIT VOLTAGE VOC', module.v_oc))
print "Short-Circuit Current (i_sc):", module.i_sc
fields.append(('SHORTCIRCUIT CURRENT ISC', module.i_sc))
fields.append(('MAX SERIES FUSE OCPD', '15'))
print "Maximum Power (p_max):", module.p_max
fields.append(('MAXIMUM POWER PMAX', module.p_max))
print "Module Rated Max Voltage:", module.Vrated
fields.append(('MAX VOLTAGE TYP 600VDC', module.Vrated))
fields.append(('VOC TEMP COEFF mVoC or oC', round(module.tk_v_oc, 2)))
fields.append(('VOC TEMP COEFF mVoC', 'On'))
print "Inverter Make:", i.make
fields.append(('INVERTER MAKE', i.make))
print "Inverter Model:", i.model
fields.append(('INVERTER MODEL', i.model))
print "Max Power", i.p_aco
fields.append(('MAX POWER 40oC', i.p_aco))
fields.append(('NOMINAL AC VOLTAGE', 240))
print "Max AC Current: %s" % round(i.p_aco / v_nominal, 2)
fields.append(('MAX AC CURRENT', round(i.p_aco / v_nominal, 2)))
fields.append(('MAX DC VOLT RATING', i.mppt_hi))
print "Max AC OCPD Rating: %s" % ee.ocp_size(
i.p_aco / v_nominal * 1.25)
print "Max System Voltage:", round(module.v_max(mintemp), 1)
print "AC Output Current: %s" % \
round(sum([i.p_aco for i in system.shape])/v_nominal, 2)
fields.append(('AC OUTPUT CURRENT', \
round(sum([i.p_aco for i in system.shape])/v_nominal, 2)))
print "Nominal AC Voltage: %s" % v_nominal
fields.append(('NOMINAL AC VOLTAGE_2', i.ac_voltage))
print "Minimum Temperature: %s C" % mintemp
print "2 Percent Max: %s C" % twopercent_temp
from fdfgen import forge_fdf
fdf = forge_fdf("", fields, [], [], [])
fdf_file = open("data.fdf", "w")
fdf_file.write(fdf)
fdf_file.close()
import shlex
from subprocess import call
cmd = shlex.split("pdftk Example2-Micro-Inverter.pdf fill_form data.fdf" \
"%s output.pdf flatten" % filename)
rc = call(cmd)
return rc
