Power Bank vs Solar Charger: Cost Compared

Solar chargers sound like the obvious upgrade for camping, but the physics of NZ weather and panel size mean a plain power bank usually wins for anything under a couple of weeks off-grid.

What a plain power bank actually costs and does

A reliable 20,000mAh power bank from a reputable brand (Anker's camping-focused range is the most common reference point in NZ outdoor retail) is good for roughly 3–5 full phone charges or one to two laptop top-ups, depending on the bank's output and your device. These typically run from roughly NZ$60–120 for a 20,000mAh unit with USB-C Power Delivery fast charging, up to $150+ for higher-capacity or ruggedised (IP67) models. For a weekend or a standard week-long NZ camping or hiking trip, this is normally enough on its own with no sun required at all.

What a solar charger actually adds — and its real limits

A small foldable solar panel (commonly 10–20W, the size that fits in a daypack) charging a power bank directly needs realistically 40–80 hours of continuous direct sunlight to take a 20,000mAh bank from flat to full — that's over a week of daily full sun exposure, not a single sunny afternoon. In NZ conditions specifically, with variable cloud cover even in summer and shorter daylight hours through autumn/winter, that number gets worse, not better. Panels are also most efficient with full sun hitting them square-on and unshaded, which is a genuinely fiddly thing to maintain while hiking or moving camp.

The realistic use case for a solar panel is topping up a power bank slowly over several days at a base camp, not actively powering devices in real time, and definitely not as your primary charging method for a short trip.

Real cost comparison

• Power bank only (20,000mAh, Anker-tier) — roughly NZ$60–150 one-off, covers most trips under a week with zero dependence on weather.
• Solar panel + power bank combo — adds another NZ$80–200+ for the panel alone on top of the power bank cost, and only pays off on trips long enough (multi-week, off-grid) that sun-charging time actually accumulates to something useful.
• All-in-one solar power banks (small integrated panel on the power bank itself) — convenient but the built-in panel is small and slow; treat the solar function as an emergency trickle-charge backup, not a real charging method, and buy primarily for the battery capacity.

The practical recommendation for most NZ trips

For anything up to about a week — the vast majority of NZ camping, tramping and weekend outdoor trips — a good capacity power bank alone is the better dollar-for-dollar buy: cheaper, faster, and not weather-dependent. A solar panel only earns its keep on genuinely extended off-grid stints (multi-week tramps, remote work trips, emergency preparedness kits) where there's no opportunity to recharge from mains power at all.