Combiner Boxes Explained with Wiring Diagrams

Noticethecopperplateatthebottom ofthehighvoltagebreaker.Theinputandoutputofthisbreaker
isfromthetopsurface.Thebreakerisessentiallytwo ofour150VDCbreakersinseries.Theyare
internallygangedsowhenonepoletrips,theotheralsotripsatthesame
time.Itisnotsufficientto
handletietwo150VDCbreakersexternally.Theywo uldnotwithstandthehighvoltage.Highvoltage
arcingtendstoweldinternalcontactstogethersowhenyouneedthebreakertotrip,itwouldinfact
fuseitselfintheonposition.Thatcouldruinyour
entiredayorworse,sousethebreakersthatare
designedforthisextremehighvoltageDC.
Thefollowingpictureshowssix300VDCbreakersinstalledintheMNPV12‐250.Thelargereliefsinthe
busbarsallowPVwiringtoeasilyentertheupperleftpoleof
eachbreaker.These168
ampbusbarsmaybecombinedas
shownorsetupastwoseparatesystemswiththreeeachhigh
voltagebreakers.Thehighvoltagebreakerscurrentlystocked
are10A,15Aand50A.Additionalvaluesareonordersocheck
withusforavailablecurrentratings.Theseareverycustom
breakerswithlong
leadtimes,sobeawarenotallvaluesmay
beavailableforawhile.Thesebreakersareonlyavailablefrom
MidNiteSolar.Listpri cefora300VDCbreakeris$34.00.

ThisistheregularMNPV12combinerwiththedeadfrontandmetalcoverremoved.Inthispicturethe
reversible
busbariscombiningtentouchsafefuse
holders.The200ampbusbarscanbeconfiguredforup
to12150VDCbreakersor10fuseseitherseparatedinto
twosystemsorcombinedasshown.TheMNPV12and
MNPV12‐250
hasrecently
passedETL
testing.Notice
thepictureof
theMNPV12
deadfrontto
the
right.Youwill
noticeasnapinadapterforusewithfuseholders.Each
combinercomeswiththemainlargedeadfrontandtwo
fuseholderadapters.Thiscombinerwithits200amp
busbariswellequippedtohandlethenewermore
powerfulPVmodules.Mostexistingcombinerscan’thandle
abunchof20ampbreakersorfuseholders.
MNPV16:ThisnewcombinerhasalsopassedETLtesting(December08).Itisintendedforusewithupto
16touchsafefuseholders.Thecurrentratingis240amps.Itcanaccommodateupto250MCMoutput
wires.Thereisplenty
ofroomforPVandgroundwiring.Theinputknockoutsareconcentric½”/7/8”