Run a fan and lights from roof solar
Two parallel roof panels charge a house battery through a Rover controller. The fan and lights each have a separate fused circuit.
Follow the circuit
01
Parallel panels
Both panel positives join the same input, as do both negatives. Current adds while the array remains at one panel’s voltage.
02
Battery first
The starter-kit guide connects the controller to the battery before connecting solar. Set the battery profile while the PV disconnect is open.
03
Loads keep their own branches
The fan and lights connect to the battery through separate fuses. Turning solar off does not turn the cabin equipment off.
The source and this example
Renogy’s Rover manual includes a 200 W example with two parallel 100 W panels and specifies the controller’s battery-side fuse.
Crimp adds a Mini Core battery, PV disconnect, compact distribution buses, fan and lights. The parallel array differs from the starter-kit video's series setup; lengths and loads are example choices.
- Renogy Rover manual, version 1.3 ↗
Printed page 26 (PDF page 27): two-panel parallel example and 20 A battery-side fuse for the Rover 20 A.
- Renogy official starter-kit setup ↗
Battery-first connection order and 200 W kit components. Its panel wiring is series; this example uses parallel.
Before you build
- Check the actual panel labels, cold voltage and short-circuit current before changing the array.
- Measure each roof and cabin cable route; verify the PV fuse and connector ratings.
- Compare daily fan and lighting use with expected solar harvest.
This is a planning example. Cable sizing uses Crimp’s ABYC-based method; the drawing does not certify an installation.
Cable sizes and connections · 16 conductors
Lengths are one way. Sizes and currents come from the same Crimp model as the drawing. Each drop value covers one drawn conductor; the full circuit includes its supply and return. AWG values are approximate counterparts to the metric areas.
| Connection | Length | Wire | Design current | Fuse | Drop |
|---|---|---|---|---|---|
| C1 · Renogy 100W Mono + → PV positive Y | 2.7 m | 4 mm²AWG 11 | 5.4 A | — | 0.34% |
| C2 · Renogy 100W Mono − → PV negative Y | 2.7 m | 4 mm²AWG 11 | 5.4 A | — | 0.34% |
| C3 · Renogy 100W Mono + → PV positive Y | 2.7 m | 4 mm²AWG 11 | 5.4 A | — | 0.34% |
| C4 · Renogy 100W Mono − → PV negative Y | 2.7 m | 4 mm²AWG 11 | 5.4 A | — | 0.34% |
| C5 · PV positive Y → Solar DP Isolator IN + | 30 cm | 4 mm²AWG 11 | 10.8 A | 20 A | 0.08% |
| C6 · PV negative Y → Solar DP Isolator IN − | 30 cm | 4 mm²AWG 11 | 10.8 A | — | 0.08% |
| C7 · Solar DP Isolator OUT + → Renogy Rover 20A PV + | 50 cm | 4 mm²AWG 11 | 10.8 A | — | 0.13% |
| C8 · Solar DP Isolator OUT − → Renogy Rover 20A PV − | 50 cm | 4 mm²AWG 11 | 10.8 A | — | 0.13% |
| C9 · Renogy 100Ah LiFePO4 Mini Core + → Positive Bus Bar + | 30 cm | 1.5 mm²AWG 16 | 20 A | 25 A | 0.55% |
| C10 · Renogy 100Ah LiFePO4 Mini Core − → Negative Bus Bar − | 30 cm | 1.5 mm²AWG 16 | 20 A | — | 0.55% |
| C11 · Renogy Rover 20A BATT + → Positive Bus Bar 1 + | 70 cm | 2.5 mm²AWG 13 | 20 A | 20 A | 0.77% |
| C12 · Renogy Rover 20A BATT − → Negative Bus Bar 3 − | 70 cm | 2.5 mm²AWG 13 | 20 A | — | 0.77% |
| C13 · Positive Bus Bar 2 + → Roof fan + | 1.7 m | 1.5 mm²AWG 16 | 5 A | 7.5 A | 0.77% |
| C14 · Negative Bus Bar 2 − → Roof fan − | 1.7 m | 1.5 mm²AWG 16 | 5 A | — | 0.77% |
| C15 · Positive Bus Bar 3 + → Cabin lights + | 2.7 m | 1.5 mm²AWG 16 | 2 A | 3 A | 0.49% |
| C16 · Negative Bus Bar 1 − → Cabin lights − | 2.7 m | 1.5 mm²AWG 16 | 2 A | — | 0.49% |
A dash means no fuse is assigned to that conductor; upstream protection may apply. Recheck the exact device, holder and placement after edits.
Equipment · 11 components
- Renogy 100W Mono
18.6 V · 5.38 A rated / planning output · 100 W · 22.3 V STC Voc
100W compact rigid mono panel, legacy RNG-100D-SS version with Vmp 18.6V, Voc 22.3V and Isc 5.86A. 1076×509×35mm, 6.5kg, 14 AWG solar leads; 15A maximum series fuse. Check the label because later versions use different voltages.
- Renogy 100W Mono
18.6 V · 5.38 A rated / planning output · 100 W · 22.3 V STC Voc
100W compact rigid mono panel, legacy RNG-100D-SS version with Vmp 18.6V, Voc 22.3V and Isc 5.86A. 1076×509×35mm, 6.5kg, 14 AWG solar leads; 15A maximum series fuse. Check the label because later versions use different voltages.
- PV positive Y
Parallel branch connector; select a matching PV connector rated for the combined current and cold open-circuit voltage.
- PV negative Y
Parallel branch connector; use compatible connectors from one manufacturer.
- Solar DP Isolator
Double-pole isolator switch — breaks both the positive and negative solar legs simultaneously for safe panel disconnect.
- Renogy Rover 20A
20 A rated / planning output
20A MPPT: 260W at 12V / 520W at 24V, 100V PV limit and a separate 20A LOAD output. Lithium needs manual bank-voltage selection; verify Rover generation before choosing a Bluetooth module.
- Renogy 100Ah LiFePO4 Mini Core
12.8 V · 100 Ah
Crimp-selected battery and assumed cable lengths. Its internal BMS is part of the catalog model; prospective fault current and the exact fuse product remain unverified.
- Positive Bus Bar
Positive bus bar — common feed with multiple output studs.
- Roof fan
5 A load allowance
Maxxfan Deluxe 7500K: 10-speed reversible 12 V roof fan with a powered lid and rain shield. The 5 A planning allowance follows the manual's minimum supply requirement; it is not a measured speed or surge rating.
- Cabin lights
2 A load allowance · 24 W
5m warm-white strip, ~24W total.
- Negative Bus Bar
Negative bus bar — common return with multiple output studs.
Crimp checks · 1 finding to review
These are the current engine findings for the saved example. They remain visible when you open it in Crimp.
- warning: Check fuse suitability: Mini Core 100Ah
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See what shore charging puts back
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Give the inverter its own supply
A dedicated battery circuit feeds a Phoenix inverter, while a separate fused branch keeps the cabin lights independent.
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