Editable DC examples
Campervan & RV 12 V wiring diagrams
A simple campervan wiring diagram with solar, a leisure battery, lights and a Maxxfan. The expanded RV solar wiring diagram adds alternator charging through an Orion XS B2B charger.
Simple solar and DC loads
6 components · 10 conductors · 12 V house system
Solid red = positive · dashed dark = return. Shared routes show both styles. Cable IDs match the schedule. Only connected terminals are drawn; crossings are not junctions. Scroll the drawing sideways on a small screen. Read the assumptions before adapting it.
Protection is unfinished. The shown fuse ratings do not select an exact protective device or locate it at the battery. Battery-end placement and unspecified-fuse warnings remain in Crimp. All charging and load currents below are design allowances, not measured operating currents.
Current engine findings
The blade-fuse interrupt check uses the engine’s chemistry-based fault-current assumption. This is not measured fault current. Resolve the bank and protection design before installation.
Check the exact fuse, holder and battery evidence →- critical: ATC fuse can't interrupt this battery's fault current (C3)
- critical: ATC fuse can't interrupt this battery's fault current (C5)
- warning: Fuse on House / auxiliary bank+ is too far from the battery (C1, C9)
- warning: House / auxiliary bank (LFP) has no fuse on the positive post (system)
- warning: 2 fused runs don't say which type of fuse (C1, C9)
Cable table — every displayed connection
Each length is one way. Drop is the engine’s run estimate including return, not a measured end-to-end system result; shared legs can have different conservative design-current bounds. “Pinned” marks a manufacturer-based example choice to review after edits. AWG is approximate; retain the stated conductor area when selecting actual wire.
| Circuit / endpoints | One-way length | Conductor | Design current | Fuse | Drop / allowance |
|---|---|---|---|---|---|
| C1 · House / auxiliary bank + ↔ Blue Sea 5026 ST Blade Fuse Block IN + | One-way length1 m3.3 ft | Conductor2.5 mm²AWG 13 · 35 A table | Design current7 A | Fuse10 A | Drop / allowance0.82% / 3% |
| C2 · House / auxiliary bank − ↔ Blue Sea 5026 ST Blade Fuse Block IN − | One-way length1 m3.3 ft | Conductor2.5 mm²AWG 13 · 35 A table | Design current7 A | FuseUnfused return | Drop / allowance0.82% / 3% |
| C3 · Blue Sea 5026 ST Blade Fuse Block 1 + ↔ Cabin lights + | One-way length3 m9.8 ft | Conductor1.5 mm²AWG 16 · 25 A table | Design current2 A | Fuse3 A | Drop / allowance1.17% / 10% |
| C4 · Blue Sea 5026 ST Blade Fuse Block 1 − ↔ Cabin lights − | One-way length3 m9.8 ft | Conductor1.5 mm²AWG 16 · 25 A table | Design current2 A | FuseUnfused return | Drop / allowance1.17% / 10% |
| C5 · Blue Sea 5026 ST Blade Fuse Block 2 + ↔ Maxxfan Deluxe 7500K + | One-way length2 m6.6 ft | Conductor1.5 mm²AWG 16 · 25 A table | Design current5 A | Fuse7.5 A | Drop / allowance1.94% / 3% |
| C6 · Blue Sea 5026 ST Blade Fuse Block 2 − ↔ Maxxfan Deluxe 7500K − | One-way length2 m6.6 ft | Conductor1.5 mm²AWG 16 · 25 A table | Design current5 A | FuseUnfused return | Drop / allowance1.94% / 3% |
| C7 · Reference solar array + ↔ SmartSolar MPPT 100/50 PV + | One-way length3 m9.8 ft | Conductor4 mm²AWG 11 · 45 A table | Design current20 A | FusePV: review string protection | Drop / allowance2.63% / 3% |
| C8 · Reference solar array − ↔ SmartSolar MPPT 100/50 PV − | One-way length3 m9.8 ft | Conductor4 mm²AWG 11 · 45 A table | Design current20 A | FuseUnfused return | Drop / allowance2.63% / 3% |
| C9 · SmartSolar MPPT 100/50 BATT + ↔ House / auxiliary bank + | One-way length1 m3.3 ft | Conductor16 mm²AWG 6 · 120 A tablePinned choice | Design current50 A | Fuse70 A | Drop / allowance0.91% / 3% |
| C10 · SmartSolar MPPT 100/50 BATT − ↔ House / auxiliary bank − | One-way length1 m3.3 ft | Conductor16 mm²AWG 6 · 120 A tablePinned choice | Design current50 A | FuseUnfused return | Drop / allowance0.91% / 3% |
Component table and exact example assumptions
| Component | Ratings, role and assumptions |
|---|---|
| House / auxiliary bankPlanning placeholder | 12 V · 200 Ah 12 V, 200 Ah planning placeholder. Select an actual bank, compatible BMS, charge/discharge limits and battery-end protection. Ah does not select the fuse. Planning example, not installation approval. Batteries, the PV array and unnamed loads are placeholders. Battery acceptance, BMS controls, low-temperature charging, short-circuit current and runtime have not been verified. Fuse ratings are preliminary cable protection or stated manufacturer choices. Exact fuse/holder, DC voltage, interrupt rating and battery-end placement still need verification. Cable fuses have no physical placement here; the editor retains its battery-protection warnings. Lengths are physical one-way conductor runs. Voltage drop includes a return; shared paths use the engine’s conservative current bounds, not a prediction of simultaneous power flow. The calculation does not verify unequal shared-return lengths as one complete circuit. AWG labels are approximate table counterparts to metric conductors, not identical cross-sectional areas. Sizing uses Crimp’s ABYC-based tables for 105°C copper outside engine spaces, with no additional heat or bundling derating in these examples. Explicit 3% circuit targets and 10% cabin-light allowances are planning choices; terminals on placeholders carry generic planning limits, not verified connector ratings. US RV, UK campervan and Australian 4WD wording does not establish UK or AS/NZS installation compliance. |
| Blue Sea 5026 ST Blade Fuse Block5026 | Blue Sea 5026: 12 ATO/ATC branches, 100 A maximum block total, 30 A maximum per branch, 32 V DC. Only two branches used. Input feed protection is separate; fuses are sold separately. Source: Blue Sea 5026 product page and wiring schematic, checked 2026-09-11. |
| Cabin lightsPlanning placeholder | 12 V · 2 A load allowance 2 A continuous planning allowance. No measured duty cycle or energy budget. |
| Maxxfan Deluxe 7500KMaxxfan Deluxe 7500K | 5 A load allowance 5 A minimum supply-service allowance from Airxcel 11E90001K (11-2017), not measured draw or startup current. Tagged black lead is positive. External fuse rating is a preliminary cable-protection choice. |
| Reference solar arrayPlanning placeholder | 20 V · 20 A rated / planning output · 400 W · 24 V STC Voc 400 W / 20 V operating / 24 V STC Voc placeholder, not a selected panel. Actual Isc, cold Voc, temperature coefficient, string fuses and PV isolation must be checked. No yield claim. |
| SmartSolar MPPT 100/50SmartSolar 100/50 | 50 A rated / planning output SmartSolar 100/50, manual rev 12 (06/2026). Battery circuit sized at rated 50 A, not the reference array’s predicted output. 70 A example fuse is within the 55–70 A battery range; 16 mm² cable choice and 1 m battery run. Connect battery first, wait 10 seconds, check voltage, then connect PV. Configure the actual battery profile. |
Solar plus alternator charging
8 components · 14 conductors · 12 V house system
Solid red = positive · dashed dark = return. Shared routes show both styles. Cable IDs match the schedule. Only connected terminals are drawn; crossings are not junctions. Scroll the drawing sideways on a small screen. Read the assumptions before adapting it.
Protection is unfinished. The shown fuse ratings do not select an exact protective device or locate it at the battery. Battery-end placement and unspecified-fuse warnings remain in Crimp. All charging and load currents below are design allowances, not measured operating currents.
Both chargers may charge the same bank. Verify their combined limit against the battery/BMS; the array does not guarantee the MPPT’s full rated output. Charger controls and a load disconnect are not modeled.
Current engine findings
The blade-fuse interrupt check uses the engine’s chemistry-based fault-current assumption. This is not measured fault current. Resolve the bank and protection design before installation.
Check the exact fuse, holder and battery evidence →- critical: ATC fuse can't interrupt this battery's fault current (C3)
- critical: ATC fuse can't interrupt this battery's fault current (C5)
- warning: Fuse on House / auxiliary bank+ is too far from the battery (C1, C9, C13)
- warning: Fuse on AGM starter bank+ is too far from the battery (C11)
- warning: House / auxiliary bank (LFP) has no fuse on the positive post (system)
- warning: 3 fused runs don't say which type of fuse (C1, C9, C13)
Cable table — every displayed connection
Each length is one way. Drop is the engine’s run estimate including return, not a measured end-to-end system result; shared legs can have different conservative design-current bounds. “Pinned” marks a manufacturer-based example choice to review after edits. AWG is approximate; retain the stated conductor area when selecting actual wire.
| Circuit / endpoints | One-way length | Conductor | Design current | Fuse | Drop / allowance |
|---|---|---|---|---|---|
| C1 · House / auxiliary bank + ↔ Blue Sea 5026 ST Blade Fuse Block IN + | One-way length1 m3.3 ft | Conductor2.5 mm²AWG 13 · 35 A table | Design current7 A | Fuse10 A | Drop / allowance0.82% / 3% |
| C2 · House / auxiliary bank − ↔ Blue Sea 5026 ST Blade Fuse Block IN − | One-way length1 m3.3 ft | Conductor2.5 mm²AWG 13 · 35 A table | Design current7 A | FuseUnfused return | Drop / allowance0.82% / 3% |
| C3 · Blue Sea 5026 ST Blade Fuse Block 1 + ↔ Cabin lights + | One-way length3 m9.8 ft | Conductor1.5 mm²AWG 16 · 25 A table | Design current2 A | Fuse3 A | Drop / allowance1.17% / 10% |
| C4 · Blue Sea 5026 ST Blade Fuse Block 1 − ↔ Cabin lights − | One-way length3 m9.8 ft | Conductor1.5 mm²AWG 16 · 25 A table | Design current2 A | FuseUnfused return | Drop / allowance1.17% / 10% |
| C5 · Blue Sea 5026 ST Blade Fuse Block 2 + ↔ Maxxfan Deluxe 7500K + | One-way length2 m6.6 ft | Conductor1.5 mm²AWG 16 · 25 A table | Design current5 A | Fuse7.5 A | Drop / allowance1.94% / 3% |
| C6 · Blue Sea 5026 ST Blade Fuse Block 2 − ↔ Maxxfan Deluxe 7500K − | One-way length2 m6.6 ft | Conductor1.5 mm²AWG 16 · 25 A table | Design current5 A | FuseUnfused return | Drop / allowance1.94% / 3% |
| C7 · Reference solar array + ↔ SmartSolar MPPT 100/50 PV + | One-way length3 m9.8 ft | Conductor4 mm²AWG 11 · 45 A table | Design current20 A | FusePV: review string protection | Drop / allowance2.63% / 3% |
| C8 · Reference solar array − ↔ SmartSolar MPPT 100/50 PV − | One-way length3 m9.8 ft | Conductor4 mm²AWG 11 · 45 A table | Design current20 A | FuseUnfused return | Drop / allowance2.63% / 3% |
| C9 · SmartSolar MPPT 100/50 BATT + ↔ House / auxiliary bank + | One-way length1 m3.3 ft | Conductor16 mm²AWG 6 · 120 A tablePinned choice | Design current50 A | Fuse70 A | Drop / allowance0.91% / 3% |
| C10 · SmartSolar MPPT 100/50 BATT − ↔ House / auxiliary bank − | One-way length1 m3.3 ft | Conductor16 mm²AWG 6 · 120 A tablePinned choice | Design current50 A | FuseUnfused return | Drop / allowance0.91% / 3% |
| C11 · AGM starter bank + ↔ Orion XS 12/12-50A IN + | One-way length3 m10 ft | Conductor16 mm²AWG 6 · 120 A tablePinned choice | Design current50 A | Fuse60 A | Drop / allowance2.78% / 3% |
| C12 · AGM starter bank − ↔ Orion XS 12/12-50A IN − | One-way length3 m10 ft | Conductor16 mm²AWG 6 · 120 A tablePinned choice | Design current50 A | FuseUnfused return | Drop / allowance2.78% / 3% |
| C13 · Orion XS 12/12-50A OUT + ↔ House / auxiliary bank + | One-way length1 m3.3 ft | Conductor16 mm²AWG 6 · 120 A tablePinned choice | Design current50 A | Fuse60 A | Drop / allowance0.91% / 3% |
| C14 · Orion XS 12/12-50A OUT − ↔ House / auxiliary bank − | One-way length1 m3.3 ft | Conductor16 mm²AWG 6 · 120 A tablePinned choice | Design current50 A | FuseUnfused return | Drop / allowance0.91% / 3% |
Component table and exact example assumptions
| Component | Ratings, role and assumptions |
|---|---|
| House / auxiliary bankPlanning placeholder | 12 V · 200 Ah 12 V, 200 Ah planning placeholder. Select an actual bank, compatible BMS, charge/discharge limits and battery-end protection. Ah does not select the fuse. Planning example, not installation approval. Batteries, the PV array and unnamed loads are placeholders. Battery acceptance, BMS controls, low-temperature charging, short-circuit current and runtime have not been verified. Fuse ratings are preliminary cable protection or stated manufacturer choices. Exact fuse/holder, DC voltage, interrupt rating and battery-end placement still need verification. Cable fuses have no physical placement here; the editor retains its battery-protection warnings. Lengths are physical one-way conductor runs. Voltage drop includes a return; shared paths use the engine’s conservative current bounds, not a prediction of simultaneous power flow. The calculation does not verify unequal shared-return lengths as one complete circuit. AWG labels are approximate table counterparts to metric conductors, not identical cross-sectional areas. Sizing uses Crimp’s ABYC-based tables for 105°C copper outside engine spaces, with no additional heat or bundling derating in these examples. Explicit 3% circuit targets and 10% cabin-light allowances are planning choices; terminals on placeholders carry generic planning limits, not verified connector ratings. US RV, UK campervan and Australian 4WD wording does not establish UK or AS/NZS installation compliance. |
| Blue Sea 5026 ST Blade Fuse Block5026 | Blue Sea 5026: 12 ATO/ATC branches, 100 A maximum block total, 30 A maximum per branch, 32 V DC. Only two branches used. Input feed protection is separate; fuses are sold separately. Source: Blue Sea 5026 product page and wiring schematic, checked 2026-09-11. |
| Cabin lightsPlanning placeholder | 12 V · 2 A load allowance 2 A continuous planning allowance. No measured duty cycle or energy budget. |
| Maxxfan Deluxe 7500KMaxxfan Deluxe 7500K | 5 A load allowance 5 A minimum supply-service allowance from Airxcel 11E90001K (11-2017), not measured draw or startup current. Tagged black lead is positive. External fuse rating is a preliminary cable-protection choice. |
| Reference solar arrayPlanning placeholder | 20 V · 20 A rated / planning output · 400 W · 24 V STC Voc 400 W / 20 V operating / 24 V STC Voc placeholder, not a selected panel. Actual Isc, cold Voc, temperature coefficient, string fuses and PV isolation must be checked. No yield claim. |
| SmartSolar MPPT 100/50SmartSolar 100/50 | 50 A rated / planning output SmartSolar 100/50, manual rev 12 (06/2026). Battery circuit sized at rated 50 A, not the reference array’s predicted output. 70 A example fuse is within the 55–70 A battery range; 16 mm² cable choice and 1 m battery run. Connect battery first, wait 10 seconds, check voltage, then connect PV. Configure the actual battery profile. |
| AGM starter bankPlanning placeholder | 12 V · 80 Ah 12 V AGM source placeholder. Engine cranking and alternator are outside this drawing. No vehicle input headroom, idle output or factory wiring has been verified. Dedicated logical return: use the vehicle’s designated ground point where required by battery current sensing. |
| Orion XS 12/12-50AOrion XS 12/12-50A | 50 A rated / planning output Non-isolated Orion XS 12/12-50A, rev 11 (06/2026). Logical IN− and OUT− represent its single physical GND terminal. Input/output limits are each up to 50 A; full output is not guaranteed at low input voltage. 60 A battery fuses and 16 mm² conductors are pinned choices. Remote/BMS control, charge profile, engine detection and alternator headroom require review. |
Before adapting an example
What these drawings assume
These camper van and RV examples cover the 12 V DC house system. AC shore supply, inverter circuits, protective earth and mains distribution are outside the drawing. This is an editable circuit example, not a full electrical or energy calculator: battery capacity and solar yield still need your daily loads, climate and charging schedule.
- Planning example, not installation approval. Batteries, the PV array and unnamed loads are placeholders. Battery acceptance, BMS controls, low-temperature charging, short-circuit current and runtime have not been verified.
- Fuse ratings are preliminary cable protection or stated manufacturer choices. Exact fuse/holder, DC voltage, interrupt rating and battery-end placement still need verification. Cable fuses have no physical placement here; the editor retains its battery-protection warnings.
- Lengths are physical one-way conductor runs. Voltage drop includes a return; shared paths use the engine’s conservative current bounds, not a prediction of simultaneous power flow. The calculation does not verify unequal shared-return lengths as one complete circuit. AWG labels are approximate table counterparts to metric conductors, not identical cross-sectional areas.
- Sizing uses Crimp’s ABYC-based tables for 105°C copper outside engine spaces, with no additional heat or bundling derating in these examples. Explicit 3% circuit targets and 10% cabin-light allowances are planning choices; terminals on placeholders carry generic planning limits, not verified connector ratings. US RV, UK campervan and Australian 4WD wording does not establish UK or AS/NZS installation compliance.
For an inverter upgrade, read the single-120 V MultiPlus-II example. Its manual requires parallel DC cables; Crimp’s single-conductor calculation does not verify that pair. It is not part of either diagram here.
Adding monitoring or larger distribution changes the current paths. Read the SmartShunt return-path example and Lynx Distributor example, including their conservative series-current bounds and unresolved protection. The model pages keep those limitations visible.
Manufacturer evidence
Exact models and manuals
Checked 11 September 2026. Component notes identify the source-backed ratings and the choices made for this example.
Victron EnergyOrion XS 12/12-50A installation and cable/fuse tableRev. 11 — 06/2026, §3.3 and charger-mode connections; checked 11 September 2026. Single physical GND and external battery protection.Victron EnergyOrion XS 12/12-50A exact-model technical dataThe 50 A model’s input and output setting limits. These do not establish available vehicle power.Blue Sea SystemsBlue Sea 5026 product specifications and wiring schematic5026 with negative bus: 100 A block total, 30 A per branch, 32 V DC; fuses sold separately. Product page and linked schematic checked 11 September 2026; no revision stated.Victron EnergySmartSolar MPPT 100/50 installationRev. 12 — 06/2026, §4: battery protection, mounting and battery-first commissioning. Checked 11 September 2026.Victron EnergySmartSolar 100/50 technical specifications100/50 column: 50 A battery output, 100 V maximum PV Voc, 60 A maximum PV Isc. The reference array is not a selected panel product.Airxcel / MaxxairMaxxfan Deluxe installation and operating guide11E90001K — 11-2017, including 7500K, pp. 1–2. Minimum supply service, tagged positive lead and onboard fuse; checked 11 September 2026.