When you're wiring the balance-of-system side of a solar setup, the combiner box sits between your panel strings and the charge controller. The first decision is how many strings you need to land: a 2-string box or a 4-string box. The 2 string solar combiner box disconnect new DC1000V Includes 63A Breakers lists at $24.99, while the 4 String Solar Combiner Box PV Combiner Circuit Breaker 63A For Solar Panel Kit lists at $62.54 - a $37.55 spread. That spread buys two extra inputs, surge protection, and an IP65 wall-mount enclosure.
Quick verdict
If your array has two DC strings and you want a simple disconnect, the 2-string box is the practical pick. If your array has four PV strings and you want surge protection plus a weather-resistant wall-mount housing, the 4-string box is the more complete solution.
Comparison
| Feature | 2-String Combiner/Disconnect | 4-String PV Combiner |
|---|---|---|
| List price | $24.99 [###-------] | $62.54 [##########] |
| Input strings | 2 | 4 |
| Built-in protection | 2 × 63A DC1000V breakers | 1 × 63A 550V breaker + 2 surge protection devices |
| Enclosure | Rainproof clear-door mini box | IP65 wall-mount box |
Where each product wins
Choose the 2-string box if you need a compact, low-cost way to disconnect two positive PV strings or combine them into one feed. The pre-installed 63A DC1000V breakers and extra knockout plugs make it a direct fit for small arrays.
Choose the 4-string box if you need to land four PV strings in one enclosure and want surge protection plus an IP65-rated housing designed for wall mounting. The included lock and mounting plates make installation straightforward.
Product notes
2 string solar combiner box disconnect new DC1000V Includes 63A Breakers
The lower-priced option is a true 2-string disconnect/combiner: two positive strings run into the rainproof mini box, where two 63A DC1000V breakers are already Din-rail mounted. The clear front door has a gasket to seal when closed, and the box includes extra knockout plugs. If you use it as a combiner, you will need wirenuts to join the wires; if you use it as a disconnect, you simply run the two positive leads through the breakers. The limitation is capacity: with only two string inputs, this compact enclosure suits a small array better than a system you plan to expand.
4 String Solar Combiner Box PV Combiner Circuit Breaker 63A For Solar Panel Kit
The 4-string box is built for a larger solar panel kit: four PV array inputs come in, one string goes out, and a 63A circuit breaker plus two surge protection devices sit inside a natural-cooling, IP65-rated enclosure. It comes with a combination lock, four mounting plates, and the other hardware needed for assembly, and it is designed for wall mounting. The trade-off is that the extra inputs and protection add cost, and a two-string system may not need that much capacity. For a four-string array, however, this box gives you the room to land all four inputs in one place.
Final choice by use case
For a two-string setup where cost matters most, the 2 string solar combiner box disconnect new DC1000V Includes 63A Breakers keeps the wiring simple and the price low. For a four-string array where you want surge protection, an IP65 enclosure, and wall-mount hardware, the 4 String Solar Combiner Box PV Combiner Circuit Breaker 63A For Solar Panel Kit is the one to install.
