Choosing a 4-string combiner box is a classic BOS decision: you need to bring several PV strings together safely without overcomplicating the charge controller wiring. Two listings arrive with nearly identical spec sheets. Both accept four string inputs, route them through a single 63A breaker, and carry IP65 weather protection. So what actually separates them? The way each one frames its intended job.
Quick Verdict
Both listings share the same core specifications: 4 string inputs, 1 string output, 4 poles, a 63A/550V circuit breaker, IP65 protection, wall-mount design, and a -30~70℃ operating range. The real choice comes down to positioning. If you want a title that stresses waterproofing, the 4String Solar PV Combiner Box is the direct match. If you want a title that calls out solar panel kits, the 4 String Solar Combiner Box is the clearer fit.
At a Glance
| Feature | 4String Solar PV Combiner Box | 4 String Solar Combiner Box |
|---|---|---|
| Price | USD 61.91 | USD 62.54 |
| Price bar | ||
| Input / Output | 4 Strings / 1 String | 4 Strings / 1 String |
| Circuit Breaker | 63A, 550V | 63A, 550V |
| Protection Grade | IP65 | IP65 |
| Max Input Voltage | 1000V per string | 1000V per string |
| Max Output Voltage | 600V | 600V |
| Operating Temperature | -30~70℃ | -30~70℃ |
| Mounting | Wall Mount | Wall Mount |
Where Each Product Wins
Both products share nearly every spec, so the real differences are presentation and positioning. The 4String Solar PV Combiner Box wins for buyers who want weather protection front and center; 'Waterproof' is part of its name, so it reads as an outdoor-ready part from the start. The 4 String Solar Combiner Box wins for kit builders; its title says 'For Solar Panel Kit,' and its feature notes call out compact design and high reliability, which suits a tidy enclosure setup. Since both list IP65 and the same electrical ratings, the protection level in the specs matches-the distinction is framing.
Product Notes
4String Solar PV Combiner Box 63A Circuit Breaker Solar Panel System Waterproof
The name makes the selling point obvious: this is a waterproof-ready combiner box. The listed specs confirm an IP65 protection grade, and the housing uses ABS/PC material with natural cooling for a 63A circuit breaker rated at 550V. Four string inputs feed into one string output, with a max input voltage of 1000V per string and a total input current of 40A from the array. It also includes two surge protection devices rated at 40KA/600V. The limitation here is that the title centers the PV combiner role, so kit builders won't get a solar-panel-kit cue in the product name. For independent installations, that isn't a problem-this box handles the electrical side cleanly.
4 String Solar Combiner Box PV Combiner Circuit Breaker 63A For Solar Panel Kit
This one announces its intended use in the title: 'For Solar Panel Kit.' That makes it an easy pick when you're assembling a packaged system and want a component that clearly belongs to that plan. Under the listed specs, you get the same 4-string input, single-string output layout with a 63A circuit breaker, 550V rating, and IP65 protection, all in a wall-mount ABS/PC housing. The feature notes add 'compact design' and 'high reliability,' giving the listing a slightly more polished presentation. The tradeoff? The title doesn't lead with water resistance, so the IP65 protection only appears once you read the details. For buyers who already know they're going outside, that's one extra look at the spec sheet.
Final Choice by Use Case
Choose the 4String Solar PV Combiner Box if you want the lower listed price and a title that puts waterproofing at the forefront. Its listed price is USD 61.91, making it the more economical pick on paper. Choose the 4 String Solar Combiner Box if you value the explicit solar panel kit positioning and compact design framing; it lists at USD 62.54. With the specs otherwise identical, the 63-cent gap won't change the wiring, but it can decide which listing feels right for your build.
