Choosing between two nearly identical 4-string solar combiner boxes feels like splitting hairs. Both are designed to gather multiple strings of solar panel wiring into one output, and both are built for solar installations. The only thing separating them on paper is a price difference of less than a dollar. So which one belongs in your solar panel system? The answer comes down to the label and the listing wording, not the wiring. If you are comfortable with the same internals wearing different names, the choice is even simpler.
Quick verdict
If you want the same four-string combiner box for a little less, the 4String Solar PV Combiner Box gets the nod. It costs less than the 4 String Solar Combiner Box while delivering the same enclosure and protective rating. The higher-priced box adds a brand label, but it doesn't change any electrical spec. The decision essentially comes down to whether a label is worth a fraction of a dollar. For most shoppers, the lower price wins.
Specifications at a glance
| Spec | 4String Solar PV Combiner Box | 4 String Solar Combiner Box |
|---|---|---|
| Price | $61.91 | $62.54 |
| Input strings | 4 | 4 |
| Output strings | 1 | 1 |
| Circuit breaker | 63A, 550V | 63A, 550V |
| Surge protection | 40KA, 600V | 40KA, 600V |
| Protection grade | IP65 | IP65 |
| Mounting | Wall mount | Wall mount |
| Enclosure material | ABS, PC | ABS, PC |
Where each product wins
- 4String Solar PV Combiner Box - It's the lower-price pick. The specs are identical to the more expensive box, so the only real difference is the price gap shown in the comparison table.
- 4 String Solar Combiner Box - It's the higher-price pick if you specifically want the NaMaSyo label or want a listing that says "Application: solar panel systems." That is a listing-level difference, not a performance difference.
Product notes
4String Solar PV Combiner Box 63A Circuit Breaker Solar Panel System Waterproof
This box is the lower-priced of the two. It pairs with a circuit breaker and includes two surge protection devices for extra safety. The wall-mount enclosure is outdoor-rated, and the title highlights 'Waterproof.' The spec sheet actually specifies IP65, which means protected against water jets rather than submersion. That's a helpful detail to know before mounting it in a spot that could flood. Choose this unit if the price saving matters more than the name printed on the side. If you're comparing two listings side by side, this one gives you the same connections for less money. The lower price is small, but it still leaves a bit of money in your pocket.
4 String Solar Combiner Box PV Combiner Circuit Breaker 63A For Solar Panel Kit
This box is the higher-priced of the two, and it carries the NaMaSyo label. The specs match the lower-priced unit, including the outdoor-rated ABS/PC enclosure. The description states "Application: solar panel systems," and the title says "For Solar Panel Kit," which is reassuring for kit builders. The protection rating is the same, so the added cost doesn't buy extra protection. The limitation is the price: you pay more for the same electrical performance. Go with it if you specifically want the NaMaSyo label or the explicit application note. If you are assembling a kit from scratch, the title's mention of a kit could be a small convenience.
Final choice by use case
If your priority is getting the same features for the lower price, the 4String Solar PV Combiner Box is the one to order. If you are building a solar panel kit and want a listing that explicitly names that application, plus a brand-labeled unit, the 4 String Solar Combiner Box is the better match. For everyone else, the two boxes are electrically interchangeable, so pick the title that feels clearer to you.
