Callsun 200W (2 x 100W) 2-Pack
#16 in 150 W and upFull review
A good-value pair of compact 100 W panels for a van, small RV or boat where roof space comes in odd shapes. Pair it with an MPPT controller to get the full output.
Amazon $129.99$129.99
The Callsun 200W (2 x 100W) 2-Pack is the better rigid solar panel overall, rated 4.3 to 3.4. The Callsun 200W (2 x 100W) 2-Pack leads on value, efficiency and durability. The Callsun 200W (2 x 100W) 2-Pack costs $50 less ($129.99 vs $179.99).
ACOPOWER 175W 12V Mono
#50 in 150 W and upFull review
For a van roof where a 175 W panel fits better than a 200 W one, on a 12 V system with a simple controller. Where space allows, a 200 W N-type panel gives more for the money.
Amazon $179.99$179.99
Prices were last checked October 26, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Callsun 200W (2 x 100W) 2-Pack for value ($0.65 per rated watt vs $1.03 per rated watt), efficiency (21.9% module efficiency (from size and rated power) vs 19.8% module efficiency) and durability (IP68, 10-year warranty vs IP65, 10-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 150 W and up rigid solar panel; a clear win is highlighted. How we rank explains each one.
| Factor weight | Callsun 200W (2 x 100W) 2-Pack | ACOPOWER 175W 12V Mono |
|---|---|---|
| Overall rating | 4.3/5 | 3.4/5 |
| Value 45% | 81 $0.65 per rated watt | 45 $1.03 per rated watt |
| Tested output 15% | 50 not yet independently tested (neutral score used) | 50 not yet independently tested (neutral score used) |
| Durability 25% | 100 IP68, 10-year warranty | 84 IP65, 10-year warranty |
| Efficiency 15% | 78 21.9% module efficiency (from size and rated power) | 36 19.8% module efficiency |
Specifications
| Callsun 200W (2 x 100W) 2-Pack | ACOPOWER 175W 12V Mono | |
|---|---|---|
| Output | ||
| Rated power | 200 W | 175 W |
| Module efficiency | 21.9% (rated power over panel area) | 19.8% |
| Claimed efficiency | 25% (as published on Callsun's product page and Amazon; the user manual's table gives 25.6% cell efficiency) | 19.8% (module efficiency) |
| Cells | Monocrystalline (N-type, 16BB) | Monocrystalline (64 cells) |
| Bifacial | No | No |
| Electrical | ||
| Open-circuit voltage (Voc) | 26 V | 21.6 V |
| Voltage at max power (Vmp) | 22.7 V | 18.1 V |
| Short-circuit current (Isc) | 4.6 A | 10.3 A |
| Current at max power (Imp) | 4.4 A | 9.7 A |
| Voc temperature coefficient | -0.2%/°C | -0.3%/°C |
| Series / parallel | Yes | - |
| Connections | ||
| Output connector | Solar connectors | Solar connectors (IP68), 14 AWG leads |
| Build | ||
| Weight | - | 22 lb (10 kg) |
| Dimensions | 31.1 x 22.8 x 1.2 in (each panel) | 49.7 x 27.5 x 1.4 in |
| Frame | anodized aluminum alloy | anodized aluminum alloy |
| Glass | 3.2 mm tempered | 3.2 mm tempered |
| Junction box rating | IP68 | IP65 |
| Warranty | 10 years | 10 years |
| Output warranty | 84.5% output after 25 years | 25-year power output warranty |