Quick Verdict
If you have exactly two strings and you're comfortable making wirenut connections, the 2-string box gives you a simple, low-cost way to add a disconnect. If you need room for six strings and want a more complete, ready-to-run enclosure, the 6-string box is the stronger all-around choice.
Comparison Table
| Feature | 2-String Combiner/Disconnect | 6-String Combiner with Fuses & Surge Protection |
|---|---|---|
| Price | USD 24.99 | USD 197.99 |
| String capacity | 2 | 6 |
| Built-in protection | 2 x 63A DC1000V breakers | 20A fuses, surge protection, 63A breaker |
| Enclosure | Mini rainproof CPVC box with clear gasket door | Metal spray housing with lock and key, IP65 |
| Wiring | Bare box: you combine wires with wirenuts | Pre-wired with solar wires and ground connector |
Where Each Product Wins
The 2-string box wins on price and simplicity. It's a compact unit that keeps wiring straightforward for two positive strings, and it can double as a combiner if you add wirenuts.
The 6-string box wins on capacity and protection. It offers room for six strings and a more finished, weather-resistant housing that's closer to plug-and-play.
Product Notes
2 String Solar Combiner Box Disconnect (DC1000V, 63A Breakers)
At $24.99, this 2-string box from buycheapsolar is a straightforward way to add a disconnect to a small array. It comes with two 63A DC breakers rated for 1000V, pre-mounted on a DIN rail inside a rainproof CPVC enclosure. The clear front door has a gasket to keep out moisture when closed, and the box is only about 4 x 2.5 x 3 inches, so it fits in tight spaces. You can run two positive strings through it and use the breakers as a disconnect, or combine the wires yourself with wirenuts to create a two-string combiner. The main limitation is the do-it-yourself wiring: there are no fuses, no surge protection, and no pre-wired cables. If you want a ready-to-connect module or you need more than two strings, this small box will feel limited.
6 String Solar Combiner Box with 20A Fuse, Surge Protection & 63A Breaker
The 6-string box is the more complete solution for larger arrays. Priced at $197.99, it bundles six 20A fuses, surge protection, and a 63A breaker in a durable metal spray housing with a lock and key. The IP65 rating means it's designed to withstand the weather, and the pre-wired solar wires and built-in ground connector reduce the amount of field wiring you have to do. The model number DZ47-63Z points to the 63A breaker family, and the three-phase configuration suggests it can handle heavier, more complex setups. The trade-off is price: it costs $173 more than the 2-string box, and if you only have two strings, you're paying for capacity and protection you won't use. For a single small array, the extra features may be overkill.
Final Choice by Use Case
For a small off-grid setup with two strings and a tight budget, the 2-string combiner/disconnect is the logical pick. For a grid-tied or larger array with six strings, where you want more sophisticated protection and a weatherproof locking enclosure, the 6-string combiner is the better investment. Match the box to your string count and the level of pre-built protection you're comfortable relying on.
