No I always call the customer service.

PowGrow PV Combiner Box, 4 String Metal Solar Combiner Box with 15A Rated Current Fuse, Surge Protective Device and 50A Air Circuit Breaker for On/Off Grid Solar Panel System, Pre-Wired Cable

PowGrow PV Combiner Box, 4 String Metal Solar Combiner Box with 15A Rated Current Fuse, Surge Protective Device and 50A Air Circuit Breaker for On/Off Grid Solar Panel System, Pre-Wired Cable

Q: Have three strings. I need a 20 amp fuse for one of them, can I replace one of the 15 amp fuses with a 20 amp and keep the remaining fuses 15 amps?

For your case, please ensure the three strings' total voltage are close or the same to each other.

Q: My panels have 8.9Amp.Should that be protected by 10Amp fuse?

This does not matter. 10Amp and 15 Amp are both can be used. We offered 15Amp.

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Product ID: 567039872

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⚡15A Fuse

🔒Metal Lock

🌧️IP65 Waterproof

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Description

Harness the Sun Safely! ☀️

🌍 ECO FRIENDLY DESIGN - Crafted from durable metal for long-lasting outdoor use.
📈 OPTIMIZED PERFORMANCE - Reduces cable length for enhanced system efficiency.
🔌 PRE WIRED CONVENIENCE - All wires are pre-installed for quick and easy setup.
🔋 RELIABLE POWER MANAGEMENT - Ensure your solar system operates safely and efficiently.
🛡️ ADVANCED PROTECTION FEATURES - Built-in surge protection and overload safeguards.

The PowGrow PV Combiner Box is a robust 4-string metal solar combiner box designed for both on-grid and off-grid solar power systems. It features a 15A rated current fuse, surge protective device, and a 50A air circuit breaker, ensuring reliable and safe operation. With an IP65 waterproof rating and durable metal construction, this combiner box is built to withstand outdoor conditions while optimizing your solar panel system's performance.