When you are wiring multiple solar panels into a charge controller and the rest of your solar BOS, a combiner box is where those panel strings merge. Two 4-string options are vying for the same spot: the 4String Solar PV Combiner Box 63A and the Solar Combiner Box PV Combiner 63A. Their strong points are different enough that one may fit your build better.
Quick verdict
If you want the lower price and a published IP65 weather-protection grade, go with the 4String Solar PV Combiner Box at $61.91. If you would rather have a standard combiner that keeps the layout simple, the Solar Combiner Box PV Combiner at $62.54 is the easy pick. The electrical specs that determine your wiring are nearly identical, so the final call comes down to weatherproofing detail and a 63-cent price gap.
Comparison table
| Spec | 4String Solar PV Combiner Box 63A | Solar Combiner Box PV Combiner 63A |
|---|---|---|
| Price | USD 61.91 | USD 62.54 |
| PV strings | 4 input strings | 4 input strings |
| Max input current per PV array | 10A | 10A |
| Circuit breaker | 63A, 550V | 63A, 550V |
| Surge protection devices | 2 | 2 |
| Enclosure material | ABS, PC | ABS, PC |
| Cooling method | Natural cooling | Natural cooling |
| Condition | New | New |
Where each product wins
- The 4String Solar PV Combiner Box 63A wins on environmental coverage and included mounting extras.
- The Solar Combiner Box PV Combiner 63A wins on simple, standard presentation, with a high-voltage lightning arrester and familiar layout.
4String Solar PV Combiner Box 63A
The 4String Solar PV Combiner Box 63A is the outdoor specialist here. Its published IP65 protection grade and -30 to 70°C operating range are the clearest signs that it is built to sit outside near your solar array. The included combination lock and mounting plates make installation a little more self-contained. The one real limitation is the output: it is a single output string, so all four downstream leads have to converge into one set of terminals before they run to your charge controller. That is fine for many panel setups, but if you planned to keep two separate output runs, you will need to adapt your wiring. For a straightforward roof-edge or exposed-wall installation, this box gives you more environmental detail for the same basic job.
Solar Combiner Box PV Combiner 63A
The Solar Combiner Box PV Combiner 63A is the no-frills option for a conventional four-string solar panel kit. It includes a high-voltage lightning arrester and durable ABS/PC housing, which are the two features that stand out here. It presents the familiar white combiner-box layout, so the wiring order feels normal to anyone who has installed these before. The limitation is the fixed four-string scope: the box is built around four input strings, so a fifth string would require a second combiner rather than an expansion of this unit. Within that scope, though, it covers the essential protection and confluence duties without a lot of extra detail to sort through. If you want a simple, standard unit to match an existing four-panel setup, this one is easy to recommend.
Final choice by use case
Choose the 4String Solar PV Combiner Box 63A if your combiner will be mounted on an exposed wall or roof edge where rain, sun, and temperature swings are part of the job. Choose the Solar Combiner Box PV Combiner 63A if your unit sits in a sheltered spot and you prefer a standard combiner. Both boxes handle the same merging job for your charge controllers and solar BOS, so let your mounting environment be the tiebreaker.
