When you're setting up a solar array, the combiner box is the quiet traffic cop between your panels and inverter. It merges multiple strings into one feed and adds surge protection. In the charge controllers solar bos category, this is one of those parts you don't want to get wrong. Two nearly identical options are sitting at essentially the same price point - $61.91 versus $62.54 - so the picking comes down to which protection details and extras match your installation site.
Quick verdict
Both boxes use ABS/PC construction with natural cooling and a 63A/550V circuit breaker. The 4String Solar PV Combiner Box adds an IP65 waterproof rating and comes with a combination lock and mounting plates. The Solar Combiner Box PV Combiner adds a dedicated lightning arrester and a white finish. For outdoor installations, the waterproofing and included hardware of the first box give it the practical edge; for those who want lightning protection named explicitly, the second box is the one to choose.
At a glance
| Feature | 4String Solar PV Combiner Box | Solar Combiner Box PV Combiner |
|---|---|---|
| Price | $61.91 | $62.54 |
| Input strings | 4 | 4 |
| Circuit breaker | 63A, 550V | 63A, 550V |
| Protection | IP65, 2 surge protection devices (40KA/600V) | High-voltage lightning arrester, 2 surge protection devices |
| Highlight | Waterproof, wide temp range, includes lock and mounting plates | Lightning arrester, white finish |
Where each product wins
4String Solar PV Combiner Box wins if your installation is outdoors. The IP65 protection grade and -30 to 70°C operating range are listed right in the spec, and the package comes with a combination lock and four mounting plates - so you don't have to source extra hardware just to attach the box to a wall.
Solar Combiner Box PV Combiner wins if you want lightning protection explicitly front and center. It lists a high-voltage lightning arrester alongside two surge protection devices, which is a reassuring detail in areas prone to thunderstorms. The white exterior also blends into a clean utility room.
Product notes
4String Solar PV Combiner Box 63A Circuit Breaker Solar Panel System Waterproof
At its list price, this is the option that looks the most like an outdoor-ready package. The IP65 rating means the enclosure is designed to keep out rain and dust, and the operating range of -30 to 70°C covers everything from freezing winter mornings to hot attic summers. The 40KA/600V surge protection device is a solid safety net for a 4-string array, and the included combination lock and mounting plates eliminate a trip to the hardware store. The trade-off is in the protection description: the spec sheet leads with surge protection devices rather than a dedicated lightning arrester line, so if that named feature is important to you, the competing box calls it out more directly.
Solar Combiner Box PV Combiner 63A Circuit Breaker 4 String For Solar Panel Kit
This one's headline is the high-voltage lightning arrester, which is its most distinctive addition. The ABS and PC construction is described as impact- and corrosion-resistant, and the white finish gives it a tidy, neutral look on a wall or in an enclosure. It's also a true 4-string design with a 63A/550V circuit breaker and two surge protection devices, so the core protection matches the other box. The listed details concentrate on the lightning arrester and material quality, so you'll see less about waterproofing and temperature range here. If your array is fully exposed to the weather, the other box's spec sheet gives you more environmental confidence.
Final choice by use case
Go with the 4String Solar PV Combiner Box when the box will sit outside or in a harsh environment, and you want the convenience of included mounting hardware. Its IP65 rating and temperature range address the most common failure points for outdoor solar gear.
Pick the Solar Combiner Box PV Combiner when you want lightning protection prominently named in the components, and when a white, neat-looking enclosure matters more than the waterproofing specifics. The small price difference between the two makes this a straight choice between environmental protection and lightning-arrester emphasis.
