Engine-checked · within

100W 12V Refrigerator Solar Wiring Diagram with Battery (1S1P)

Computed 100W 12V refrigerator solar diagram: 1S1P array, wire gauges, OCPD, battery arrangement, routed parts and printable files.

100W 12V Refrigerator Solar Wiring Diagram with Battery (1S1P) showing 1S1P panels, MPPT controller, 1S2P battery bank, wire gauges and OCPD ratings
Computed from the values printed in the schedules below; not a permit set.
Download SVGDownload 1600 px PNGDownload 800 px PNGDownload PDF
View the scalable diagram inline100W 12V Refrigerator Solar Wiring Diagram with Battery (1S1P)Computed 1S1P schematic for a 100 W 12 V refrigerator system, including wire and OCPD labels.FIG. OGA-LIBRARY-103100W 12V Refrigerator Solar Wiring Diagram with Battery (1S1P)COMPUTED FROM OGA CALC-CORE · NOT A PERMIT SET8 AWG · 15 A OCPD · 2.87% drop12 AWG · 15 A OCPD · 1.93% drop4 AWG · 70 A OCPD · 0.57% drop1 × 100 W panels1S1P · 24 Voc / 5.5 IscCombiner1 stringDC disconnect15 A DC ratedMPPT controller11 A min · 100 V max15 A OCPDController output2 × 120 Ah LiFePO₄1S2P · 3072 Wh bank70 A OCPDInverter feed600 W inverter1200 W surge · 55.6 A DCShunt55.6 A monitored returnGround busEquipment groundingarray → controller8 AWG · 15 A OCPD · 2.87% drop43 ft one way · Coppercontroller → battery12 AWG · 15 A OCPD · 1.93% drop7 ft one way · Copperbattery → inverter4 AWG · 70 A OCPD · 0.57% drop2 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 100W 12V Refrigerator Solar Wiring Diagram with Battery (1S1P) turns a searched-for refrigerator idea into one internally consistent DC schematic. Its 100 W array uses 1 modules in 1S1P, so the drawing labels the array at 20 Vmp and 5.5 Isc rather than relying on a generic icon. The result is a planning reference for comparing real equipment ratings before installation.

A MPPT device is shown because the array and bank operate at different useful voltage points. The engine calculates 10.4 A of required controller output and tests 30 V against a 100 V input rating. These limits should be matched to a manufacturer datasheet, including its temperature assumptions.

PV current is evaluated at 8.6 A for the 43 ft array run, which selects 8 AWG copper plus a 15 A OCPD. Charging current is 8.3 A across 7 ft, moving the recommendation to 12 AWG copper with 15 A protection. Each percentage in the table is a round-trip voltage-drop calculation.

The battery table translates 2 individual 120 Ah units into a 1S2P bank. In this 12 V design, the result is 240 Ah and 3,072 Wh of nominal storage. Usable energy will be lower and depends on chemistry limits, temperature, battery management and the connected load profile.

At the final DC segment, the current rises to 55.6 A for a 600 W inverter. The page assigns 4 AWG copper to the 2 ft route, with 70 A OCPD and 0.57% calculated drop. Termination ratings and the inverter maker’s fuse instructions remain controlling.

The generated SVG, PNG and tables intentionally repeat the same computed labels so discrepancies are visible during review. If a purchased controller, battery or inverter differs from the values above, regenerate the design from the linked machine before wiring. This refrigerator example is not a permit set and does not replace equipment instructions or a qualified local professional.

For later comparison, keep the 100 W array, 1S2P bank and the 43/7/2 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 → controller8.6 A43 ft8 AWG copper2.87%156% of array Isc (NEC 690.8)
controller → battery8.3 A7 ft12 AWG copper1.93%controller output at 125% continuous-load ampacity
battery → inverter55.6 A2 ft4 AWG copper0.57%inverter continuous DC input at 90% efficiency and 125% ampacity

Overcurrent protection

Protected segmentRequired ampacityOCPDConductor ampacityVerdict
array → controller8.6 A15 A40 Awithin
controller → battery10.4 A15 A20 Awithin
battery → inverter69.4 A70 A70 Awithin

Battery arrangement

ArrangementChemistryUnitsUnit capacityBank capacityNominal energyNominal voltage
1S2PLiFePO₄2120 Ah240 Ah3,072 Wh12 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.

1 × 100 W solar panelVoc 24 V, Vmp 20 V, Isc 5.5 AVerify locally — no proven catalogue match
2 × 120 Ah LiFePO₄ battery1S2P bank, 3072 Wh nominalVerify locally — no proven catalogue match
95 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 × 15 A breaker / fuseDC-rated, 20 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 × 12 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 12 AWGVerify locally — no proven catalogue match
1 × 15 A breaker / fuseDC-rated, 12 V system — must not exceed the wire's 20 A ratingVerify locally — no proven catalogue match
1 pr × Heat-shrink + ferrulesadhesive-lined, color-codedVerify locally — no proven catalogue match
10 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 × 70 A breaker / fuseDC-rated, 12 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

Pre-install review steps

  1. Confirm the array and controller window: Verify that the 1S1P string plan produces 24 V open circuit and that the equipment is rated above the 30 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 43 ft, 7 ft and 2 ft runs shown here.
  3. Build complete battery strings: Arrange all 2 battery units as 1S2P; do not leave a partial series string in a 12 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 600 W inverter.

Customize or compare

Customize this diagram →

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

200W 12V Refrigerator Solar Wiring Diagram Complete (1S1P)400W 12V Refrigerator Solar Wiring Diagram PDF (1S2P)800W 12V Refrigerator Solar Wiring Diagram Printable (2S2P)