Choosing a combiner box for a solar panel kit isn't the flashy part of the build, but it's where the wiring gets organized and protected. In the charge controllers solar BOS space, two white 4-string units are sitting near the same price point: the 4 String Solar Combiner Box and the Solar Combiner Box PV 4 String. Both are built around the same circuit-breaker spec, so the practical question is which one's listed details match your expectations.
Quick verdict: Both are 4-string combiner boxes with a 63A, 550V breaker, two surge protection devices, natural cooling, and a white finish. At the listed prices they are only 63 cents apart-USD 61.91 versus USD 62.54. The 4 String Solar Combiner Box wins if you prefer an explicitly stated enclosure protection grade. The Solar Combiner Box PV 4 String wins if you want the listed details to emphasize protection hardware.
| Product | Listed price | Price bar | Key listed detail |
|---|---|---|---|
| 4 String Solar Combiner Box | USD 61.91 | Compact Design, Unique Appearance, High Reliability; IP65 | |
| Solar Combiner Box PV 4 String | USD 62.54 | Stable performance and high quality; 10A rated current fuse, high-voltage lightning arrester |
Where the 4 String Solar Combiner Box wins: The specification sheet is more explicit. It includes IP65 protection, two 40KA/600V surge protection devices, a 1000V max input voltage per array, and a 600V max output voltage. It also carries the GDRASUYA10 name and highlights compact design, unique appearance, and high reliability.
Where the Solar Combiner Box PV 4 String wins: The product details lean into ruggedness. If that is the language you want to see in a combiner box, this unit gives it to you at its listed price.
4 String Solar Combiner Box
This box is the more spec-heavy option. The product details include an enclosure protection grade and natural cooling. The spec also lists a 1000V max input voltage per PV array and a 600V max output voltage, which are useful numbers to check against your setup. One thing to note: the spec caps each PV array at 10A input current, so this box is aimed at panels that stay within that range. The compact unit carries the GDRASUYA10 name, which gives you a named reference point in the details and makes it easy to identify.
Solar Combiner Box PV 4 String
This unit puts its product details into material toughness. The details point to high-quality ABS and PC construction that resists impact, corrosion, wear, and break, and they add extra protection hardware to the package. The enclosure is also tied to stable performance and high quality, which is reassuring if those words matter to you. For this kind of solar setup, the extra protection language can be the deciding point. The one tradeoff is the price: it sits above the other unit in the listed prices. If the material and protection language is what you're after, this is the box to choose.
Final choice by use case: For a straightforward solar panel combiner setup where the spec sheet and named unit matter, the 4 String Solar Combiner Box is the one. For a build where protection language and material toughness matter, choose the Solar Combiner Box PV 4 String. With nearly identical core specs and color, the real difference is which listed details you value more.
