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800W 12V Well-Pump Solar Wiring Diagram Printable (2S2P)

Computed 800W 12V well pump solar diagram: 2S2P array, wire gauges, OCPD, battery arrangement, routed parts and printable files.

800W 12V Well-Pump Solar Wiring Diagram Printable (2S2P) showing 2S2P panels, MPPT controller, 1S2P 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 inline800W 12V Well-Pump Solar Wiring Diagram Printable (2S2P)Computed 2S2P schematic for a 800 W 12 V well pump system, including wire and OCPD labels.FIG. OGA-LIBRARY-113800W 12V Well-Pump Solar Wiring Diagram Printable (2S2P)COMPUTED FROM OGA CALC-CORE · NOT A PERMIT SET8 AWG · 35 A OCPD · 2.17% drop2 AWG · 90 A OCPD · 1.08% drop250 kcmil · 200 A OCPD · 0.76% drop4 × 200 W panels2S2P · 48 Voc / 21 IscCombiner2 stringsDC disconnect35 A DC ratedMPPT controller84 A min · 150 V max90 A OCPDController output2 × 120 Ah AGM1S2P · 2880 Wh bank200 A OCPDInverter feed1600 W inverter3200 W surge · 148.1 A DCShunt148.1 A monitored returnGround busEquipment groundingarray → controller8 AWG · 35 A OCPD · 2.17% drop17 ft one way · Coppercontroller → battery2 AWG · 90 A OCPD · 1.08% drop5 ft one way · Copperbattery → inverter250 kcmil · 200 A OCPD · 0.76% drop6 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

This well pump drawing starts with 4 × 200 W modules and ends with a protected 1,600 W inverter feed. Between those points, the 800W 12V Well-Pump Solar Wiring Diagram Printable (2S2P) preserves the exact 2S2P topology and 12 V bank selected in the catalogue. The drawing and schedules are regenerated from one shared system object to prevent labels from drifting apart.

Controller sizing follows two separate limits in this well pump configuration. Power conversion calls for 84 A or more at the battery side, and cold-array allowance raises the PV check from 48 V nameplate Voc to 60 V. The selected MPPT envelope is 100 A and 150 V.

PV current is evaluated at 32.8 A for the 17 ft array run, which selects 8 AWG copper plus a 35 A OCPD. Charging current is 66.7 A across 5 ft, moving the recommendation to 2 AWG copper with 90 A protection. Each percentage in the table is a round-trip voltage-drop calculation.

For storage, the computed arrangement is 1S2P, assembled from 2 × 120 Ah AGM batteries. Series connection establishes the 12 V nominal level, while parallel strings bring the bank to 240 Ah. The displayed 2,880 Wh is nominal capacity rather than a promise of daily usable energy.

The inverter contributes 148.1 A of continuous DC input at the engine’s efficiency assumption. Over a 6 ft one-way cable path, 250 kcmil copper and a 200 A protective device keep calculated drop at 0.76%. Its 3,200 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 800 W array, 1S2P bank and the 17/5/6 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 → controller32.8 A17 ft8 AWG copper2.17%156% of array Isc (NEC 690.8)
controller → battery66.7 A5 ft2 AWG copper1.08%controller output at 125% continuous-load ampacity
battery → inverter148.1 A6 ft250 kcmil copper0.76%inverter continuous DC input at 90% efficiency and 125% ampacity

Overcurrent protection

Protected segmentRequired ampacityOCPDConductor ampacityVerdict
array → controller32.8 A35 A40 Awithin
controller → battery83.3 A90 A95 Awithin
battery → inverter185.2 A200 A215 Awithin

Battery arrangement

ArrangementChemistryUnitsUnit capacityBank capacityNominal energyNominal voltage
1S2PAGM2120 Ah240 Ah2,880 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.

4 × 200 W solar panelVoc 24 V, Vmp 20 V, Isc 10.5 AVerify locally — no proven catalogue match
1 × MPPT charge controllerat least 84 A output and 60 V PV inputVerify locally — no proven catalogue match
2 × 120 Ah AGM battery1S2P bank, 2880 Wh nominalVerify locally — no proven catalogue match
40 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, 40 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 × 2 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 2 AWGVerify locally — no proven catalogue match
1 × 90 A breaker / fuseDC-rated, 12 V system — must not exceed the wire's 95 A ratingVerify locally — no proven catalogue match
1 pr × Heat-shrink + ferrulesadhesive-lined, color-codedVerify locally — no proven catalogue match
20 ft × 250 kcmil 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 250 kcmil AWGVerify locally — no proven catalogue match
1 × 200 A breaker / fuseDC-rated, 12 V system — must not exceed the wire's 215 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 2S2P string plan produces 48 V open circuit and that the equipment is rated above the 60 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 17 ft, 5 ft and 6 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 1,600 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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