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2100W 48V Garage Solar Wiring Diagram Complete (3S2P)

Computed 2100W 48V garage solar diagram: 3S2P array, wire gauges, OCPD, battery arrangement, routed parts and printable files.

2100W 48V Garage Solar Wiring Diagram Complete (3S2P) showing 3S2P panels, MPPT controller, 4S3P battery bank, wire gauges and OCPD ratings
Computed from the values printed in the schedules below; not a permit set.
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View the scalable diagram inline2100W 48V Garage Solar Wiring Diagram Complete (3S2P)Computed 3S2P schematic for a 2,100 W 48 V garage system, including wire and OCPD labels.FIG. OGA-LIBRARY-0852100W 48V Garage Solar Wiring Diagram Complete (3S2P)COMPUTED FROM OGA CALC-CORE · NOT A PERMIT SET8 AWG · 35 A OCPD · 1.49% drop4 AWG · 60 A OCPD · 0.28% drop1 AWG · 100 A OCPD · 0.24% drop6 × 350 W panels3S2P · 135 Voc / 20 IscCombiner2 stringsDC disconnect35 A DC ratedMPPT controller55 A min · 250 V max60 A OCPDController output12 × 200 Ah AGM4S3P · 28800 Wh bank100 A OCPDInverter feed3200 W inverter6400 W surge · 74.1 A DCShunt74.1 A monitored returnGround busEquipment groundingarray → controller8 AWG · 35 A OCPD · 1.49% drop34 ft one way · Coppercontroller → battery4 AWG · 60 A OCPD · 0.28% drop5 ft one way · Copperbattery → inverter1 AWG · 100 A OCPD · 0.24% drop5 ft one way · CopperPOSITIVENEGATIVEEQUIPMENT GROUNDFAILING SEGMENTNEC 2023 Table 310.16 (60 C column) - conductor ampacityNEC Chapter 9, Table 8 - conductor DC resistanceNEC 240.6(A) - standard overcurrent-device ratingsNEC 210.19 / 215.2 - 125% continuous-load conductor sizingNEC 690.7 - maximum PV source-circuit voltageNEC 690.8 - PV source-circuit current sizingVerify equipment terminals, listings, ambient/bundling derates and local code before installation.

What this computed plan shows

The 2100W 48V Garage Solar Wiring Diagram Complete (3S2P) turns a searched-for garage idea into one internally consistent DC schematic. Its 2,100 W array uses 6 modules in 3S2P, so the drawing labels the array at 111 Vmp and 20 Isc rather than relying on a generic icon. The result is a planning reference for comparing real equipment ratings before installation.

Controller sizing follows two separate limits in this garage configuration. Power conversion calls for 55 A or more at the battery side, and cold-array allowance raises the PV check from 135 V nameplate Voc to 168.8 V. The selected MPPT envelope is 70 A and 250 V.

Starting at the roof or rack, 8 AWG copper covers the 34 ft PV run with 1.49% drop and a 35 A protective device. The controller-to-bank segment is shorter at 5 ft, yet its 43.8 A design current calls for 4 AWG copper and 60 A OCPD. Distance and current are both visible because either can determine conductor size.

For storage, the computed arrangement is 4S3P, assembled from 12 × 200 Ah AGM batteries. Series connection establishes the 48 V nominal level, while parallel strings bring the bank to 600 Ah. The displayed 28,800 Wh is nominal capacity rather than a promise of daily usable energy.

The inverter contributes 74.1 A of continuous DC input at the engine’s efficiency assumption. Over a 5 ft one-way cable path, 1 AWG copper and a 100 A protective device keep calculated drop at 0.24%. Its 6,400 W surge label is recorded for equipment comparison, but the schedule must still be checked against the chosen inverter manual.

This page stays inside the verified engine boundary: every component and conductor currently returns a within verdict. A different panel label, longer run, hotter ambient or changed battery count can alter that result, so follow the customize link rather than scaling the picture by intuition. Local rules, equipment listings and inspection requirements take precedence over this planning aid.

For later comparison, keep the 2,100 W array, 4S3P bank and the 34/5/5 ft one-way routes together when requesting equipment quotes or an inspection review.

Wire, protection and battery schedules

Wire schedule

SegmentDesign currentOne-way runComputed conductorVoltage dropSizing basis
array → controller31.2 A34 ft8 AWG copper1.49%156% of array Isc (NEC 690.8)
controller → battery43.8 A5 ft4 AWG copper0.28%controller output at 125% continuous-load ampacity
battery → inverter74.1 A5 ft1 AWG copper0.24%inverter continuous DC input at 90% efficiency and 125% ampacity

Overcurrent protection

Protected segmentRequired ampacityOCPDConductor ampacityVerdict
array → controller31.2 A35 A40 Awithin
controller → battery54.7 A60 A70 Awithin
battery → inverter92.6 A100 A110 Awithin

Battery arrangement

ArrangementChemistryUnitsUnit capacityBank capacityNominal energyNominal voltage
4S3PAGM12200 Ah600 Ah28,800 Wh48 V

Static routed parts list

Parts are computed from this passing configuration. A route appears only when the verified catalogue record proves every displayed numeric rating; all uncertain matches stay local for verification. Routed links may earn Off Grid Authority a commission at no extra cost to you.

6 × 350 W solar panelVoc 45 V, Vmp 37 V, Isc 10 AVerify locally — no proven catalogue match
1 × MPPT charge controllerat least 55 A output and 169 V PV inputVerify locally — no proven catalogue match
12 × 200 Ah AGM battery4S3P bank, 28800 Wh nominalVerify locally — no proven catalogue match
1 × 3200 W inverter6400 W surge, 48 V DC inputVerify locally — no proven catalogue match
75 ft × 8 AWG Copper cableTHHN/THWN-2 copper (or UL-listed battery cable), 75°C+Verify locally — no proven catalogue match
2 × Ring/lug terminalstinned, sized for 8 AWGVerify locally — no proven catalogue match
1 × 35 A breaker / fuseDC-rated, 111 V system — must not exceed the wire's 40 A ratingVerify locally — no proven catalogue match
1 pr × Heat-shrink + ferrulesadhesive-lined, color-codedVerify locally — no proven catalogue match
20 ft × 4 AWG Copper cableTHHN/THWN-2 copper (or UL-listed battery cable), 75°C+Verify locally — no proven catalogue match
2 × Ring/lug terminalstinned, sized for 4 AWGVerify locally — no proven catalogue match
1 × 60 A breaker / fuseDC-rated, 48 V system — must not exceed the wire's 70 A ratingVerify locally — no proven catalogue match
1 pr × Heat-shrink + ferrulesadhesive-lined, color-codedVerify locally — no proven catalogue match
20 ft × 1 AWG Copper cableTHHN/THWN-2 copper (or UL-listed battery cable), 75°C+Verify locally — no proven catalogue match
2 × Ring/lug terminalstinned, sized for 1 AWGVerify locally — no proven catalogue match
1 × 100 A breaker / fuseDC-rated, 48 V system — must not exceed the wire's 110 A ratingVerify locally — no proven catalogue match
1 pr × Heat-shrink + ferrulesadhesive-lined, color-codedVerify locally — no proven catalogue match

Pre-install review steps

  1. Confirm the array and controller window: Verify that the 3S2P string plan produces 135 V open circuit and that the equipment is rated above the 168.8 V cold-design value.
  2. Lay out the protected DC runs: Measure the one-way paths before ordering cable, then compare them with the computed 34 ft, 5 ft and 5 ft runs shown here.
  3. Build complete battery strings: Arrange all 12 battery units as 4S3P; do not leave a partial series string in a 48 V bank.
  4. Commission against equipment instructions: Check polarity, terminal torque, DC interrupt ratings, conductor temperature ratings, ambient correction and local inspection requirements before energizing the 3,200 W inverter.

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Open the parent build guide for the surrounding design context, safety notes and installation discussion.

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