How to Choose the Right Solar Panel for Your Setup

Modified on Wed, 23 Jul at 12:08 AM

Choosing the right solar panel is essential to get the most out of your solar power system—whether you're setting up for camping, off-grid living, or vehicle charging. This guide will help you understand the key factors so you can make the right decision for your needs.

? 1. Understand the Different Types of Solar Panels

Panel Type	Pros	Cons	Best For
Rigid Panels	High efficiency, long lifespan, weather-resistant	Bulky, heavier	Permanent rooftop or ground installs
Folding Solar Panels	Portable, plug-and-play	Requires setup/space	Campers, 4WDs, mobile use
Solar Blankets	Ultra-lightweight, compact	Slightly less efficient	Overlanding, hiking, minimal storage setups
Flexible Panels	Bendable for curved surfaces	Less durable	Boats, curved rooftops, caravans

✅ Choose the panel type that suits your portability and mounting needs.

⚡ 2. Match the Panel Output to Your Power Needs

Use this simple formula to size your panel based on your daily power usage (in Wh):

Solar Panel Wattage = Daily Usage (Wh) ÷ Peak Sun Hours

For most areas in Australia, you get about 5 peak sun hours/day.

Example:
If your fridge and devices use 600Wh/day:
→ 600 ÷ 5 = 120W minimum
→ Add 20–30% buffer for inefficiencies → 150–160W panel

? Also ensure your solar panel can comfortably recharge your battery size.

?️ 3. Check Compatibility with Your Charge Controller

Your solar panel must be compatible with your MPPT or PWM charge controller:

12V panels typically have a Vmp (voltage max power) of 18V–22V
Match the panel voltage and amperage to what your charge controller can handle
MPPT controllers are more efficient and flexible with panel voltages

⚠️ Going over voltage/current ratings of your controller can cause system damage.

?️ 4. Consider Durability and Conditions

Think about where and how your panel will be used:

Feature	Why It Matters
IP Rating	Waterproofing—important for outdoor or marine use
ETFE Coating	Durable, scratch-resistant surface coating (better than PET)
Aluminium Frame	Stronger for fixed mounting in wind-prone or rugged areas
UV Resistance	Essential for long-term exposure in the Aussie sun

? 5. Popular Solar Panel Sizes (For Reference)

Panel Size	Common Use
100W–160W	Small setups, phones/lights, short trips
200W–300W	Fridges, camping fridges, moderate setups
350W–450W	Off-grid cabins, full setups, recharging lithium banks
600W+	Large off-grid, multiple appliances, battery banks 200Ah+

✅ Final Tips

Always oversize slightly to account for weather/clouds
For 12V systems, stick with 12V panels or use MPPT controllers to step down higher voltages
For permanent installations, consider mono-crystalline panels for better efficiency
Use parallel wiring to keep voltage low and current high if you're staying at 12V