Energy and solar panels

The energy autonomy of a camper starts with the coordinated choice of solar panels, batteries, charge controllers, and distribution panels. To get started, it is best to estimate the daily energy needs on board, then size the solar production and storage capacity accordingly. Leggi la guida

Solar panels

Lithium batteries

Inverter, battery charger, DC-DC

Outlets, cables and panels

Le marche di Energy and solar panels

Di-Tec Truma Antarion Cbe Dometic Extrasun Victron Energy Ring Alde Votronic Exide Victron GOK Electraline Varta Liontron

How to choose the power system for your motorhome

A properly sized system allows you to stay off-grid without relying on an electric hookup. The main components—solar panel, MPPT controller, leisure battery, and distribution panel—must be compatible with each other both electrically and physically.

Solar panels: power, size, and technology

300 W monocrystalline panels are among the most sought-after for motorhomes and vans because they offer a good compromise between the surface area required and performance. PERC technology improves efficiency in diffuse light conditions. Before purchasing, check the dimensions of the available roof space and the maximum weight it can support. All Black panels—with black frames and cells—are appreciated for their aesthetics without compromising performance. Among the brands available: ExtraSun and Antarion.

Charge controllers: MPPT or PWM

The charge controller sits between the panel and the battery, optimizing energy transfer. MPPT controllers recover more energy than PWM controllers, especially when the panel voltage is significantly higher than the battery voltage. The maximum current rating determines how much photovoltaic power the controller can process. Victron Energy is a leading brand with its BlueSolar and SmartSolar ranges; Votronic also offers products in this category.

Leisure batteries: AGM, GEL, or lithium

AGM batteries—brands available: Exide, Varta—are a proven choice for reliability at a low cost. LiFePO4 lithium batteries are lighter, have longer lifespans, and offer a greater usable depth of discharge, but require an integrated BMS and a charger compatible with the lithium charging profile. The capacity in Ah should be calculated based on estimated daily onboard consumption.

Inverters, battery chargers, and DC-DC converters

The inverter converts the battery's direct current into alternating current for 230 V appliances. The battery charger charges the batteries when connected to the mains or a generator. The DC-DC converter charges the leisure battery from the alternator in a controlled manner, protecting both the starter battery and the lithium battery. Victron Energy, Votronic, and Redarc offer products covering all three functions.

Distribution panels, sockets, and cables

The 12 V distribution panel centralizes the fuses and circuits for various systems; the CBE DS300 is a model designed specifically for motorhomes and caravans. For wiring, the cable cross-section must be chosen based on the current to be carried and the length of the run: insufficient cross-sections cause voltage drops and overheating. 230 V external CEE sockets for campsite hookups must provide the moisture resistance required for outdoor use.

Domande frequenti

Come si calcola quanti watt di pannello solare servono per il camper?

Si sommano i consumi giornalieri di tutte le utenze in wattora, poi si divide per le ore di sole efficace attese nella stagione e zona di utilizzo. Il risultato indica la potenza di picco minima; è consigliabile aggiungere un margine per giorni nuvolosi e perdite di sistema.

Posso collegare una batteria al litio al mio impianto esistente senza modifiche?

Non sempre: le batterie LiFePO4 richiedono un profilo di ricarica specifico e un BMS che le protegga da sovraccarica e scarica eccessiva. Regolatori MPPT e caricabatterie moderni hanno spesso un preset litio selezionabile, ma è necessario verificarlo prima dell'acquisto.

Qual è la differenza tra un regolatore MPPT e uno PWM?

Il PWM abbassa direttamente la tensione del pannello a quella della batteria, disperdendo la differenza. L'MPPT insegue il punto di massima potenza del pannello e converte l'energia in eccesso in corrente aggiuntiva verso la batteria, con rendimenti più alti specialmente in condizioni di scarsa irradiazione.

Che sezione di cavo usare per collegare il pannello solare alla batteria?

La sezione dipende dalla corrente massima da condurre e dalla lunghezza del percorso: più lungo il cavo e più alta la corrente, maggiore deve essere la sezione per contenere la caduta di tensione. Per impianti su camper si parte da sezioni ridotte per tratti brevi con correnti moderate, salendo progressivamente per distanze maggiori o correnti più elevate.

Nella stessa sezione

Air conditioning and heating Suspension and frame Windows and blinds Portholes and vents Maintenance and safety Water, gas and toilet Outdoor and carrying Kitchen and refrigerators