Choosing a solar combiner box for the balance-of-system side of your PV setup comes down to how much input capacity you need today and how much you want to spend. The NaMaSyo 4-string combiner and the 6-string combiner take different paths to the same job: gathering multiple panel strings into one protected feed before it reaches your charge controller or inverter. Here is how to pick the one that fits your array and your wallet.
Quick Verdict
For a compact PV array, the 4-string box at USD 62.54 keeps the balance-of-system spend low while still covering the basics. For a larger array, the 6-string box at USD 197.99 gives you more inputs and string-level fusing in a single enclosure. The price gap is USD 135.45, so the decision is whether that extra capacity and protection is worth it for your system. If you only need four inputs, the cheaper box makes sense. If you need six, the larger unit is the one to budget for.
At a Glance
| Feature | 4-String NaMaSyo Combiner Box | 6-String Combiner Box |
|---|---|---|
| Listed price | USD 62.54 | USD 197.99 |
| PV inputs | 4 | 6 |
| Circuit breaker | 63A, 550V | 63A |
| Surge protection | 40KA, 600V | surge protection |
| Enclosure rating | IP65 | IP65 |
Where Each Product Wins
The 4-string NaMaSyo wins on price: it is the lower-cost way to gather the output of a small PV array into one breaker-protected feed. It keeps the initial spend down, which matters if you are building out a small system. The 6-string unit wins on input capacity and integrated 20A fusing. That lets you bring more strings together without adding a separate fuse holder, simplifying the wiring between your panels and the next power stage.
Product Notes
NaMaSyo 4-String Solar Combiner Box
This NaMaSyo combiner is designed for a four-input setup. It includes a 63A, 550V circuit breaker, two 40KA surge protection devices, and an IP65-rated housing, so the essentials are covered in one wall-mountable enclosure. The ABS/PC construction keeps it light, and the included mounting plates make placement straightforward. The main limitation is capacity: if your array grows beyond four inputs, this unit will not be the right size. For someone with a compact PV array who wants a straightforward combiner at the lower end of the price spread, it is a strong match. Keep in mind that this box is designed for solar panel systems with up to four PV strings feeding one output.
6-String Solar Combiner Box
This unit takes on larger arrays and moves protection into the enclosure. Surge protection is built in, and the listed three-phase system configuration gives you a sense of the wiring layout it targets. The pre-wired interior, built-in ground connector, and metal spray housing with lock and key add convenience and security. The trade-off is price: this is the high end of the price spread, so the initial outlay is significant. If you do not need six inputs, the extra cost is hard to justify. If you do need that input capacity, this box consolidates protection and wiring into one unit and simplifies the install.
Final Choice by Use Case
Choose the NaMaSyo 4-string combiner when your PV array fits four inputs and you want the lower upfront price. It is the sensible choice for a compact build. Choose the 6-string combiner when you need six inputs and want 20A fusing integrated into the enclosure, even at the higher price. That combination of capacity and protection makes it the better fit for a six-string solar array.
