When you're wiring a solar balance-of-system (BOS) setup-whether it feeds an inverter or a charge controller-the combiner box is the part that gathers multiple panel strings into one output. The four boxes here range from $62.54 to $161.99, and they split between 4-string and 6-string layouts. Your main decision is how many strings you need to combine, but the breaker size, fuse rating, and extra protection features also matter.
Quick take
The Solar Combiner Box PV Combiner 63A Circuit Breaker 4 String is the least expensive way to get four inputs. The Solar PV Combiner Box 4 String 15A Steel IP65 SPD gives you a higher 125A main breaker than the other 4-string unit. For six-string arrays, the Solar PV Combiner Box 6 String 10A Steel Case balances capacity with a moderate price, while the PV Combiner Box, 6 String with LED Fuse packs in maintenance-friendly LED indicators and a lightning arrestor at the highest price.
Listed-price comparison
| Product | Listed price | Price bar |
|---|---|---|
| Solar PV Combiner Box 6 String 10A Steel Case IP65 | USD 85.99 | |
| Solar PV Combiner Box 4 String 15A Steel Case IP65 SPD | USD 78.84 | |
| PV Combiner Box, 6 String with 15A LED Fuse, Lightning Arrest | USD 161.99 | |
| Solar Combiner Box PV Combiner 63A Circuit Breaker 4 String | USD 62.54 |
Decision matrix
| What you need | Choose | Why |
|---|---|---|
| Six inputs without paying extra | Solar PV Combiner Box 6 String 10A Steel Case | 6-string capacity with a 63A 2P DC500V breaker at $85.99 |
| Highest main breaker in this group | Solar PV Combiner Box 4 String 15A Steel IP65 SPD | Features a 125A circuit breaker, larger than the other models' main breakers |
| Visible fuse status | PV Combiner Box, 6 String with 15A LED Fuse | LED fuse indicator lights when a fuse burns out, plus a 63A breaker and surge protection |
| Lowest listed price | Solar Combiner Box PV Combiner 63A Circuit Breaker 4 String | Cheapest option at $62.54 for a 4-string design |
Product notes
Solar PV Combiner Box 6 String 10A for Solar Panel System Steel Case IP65
This six-string unit uses a steel case with an IP65 rating, which suits outdoor panel runs. The supplied attributes show a 63A 2P DC500V circuit breaker and a fuse holder spec of DC 15A/500V, while the product title highlights 10A fuses for the string inputs. The rotary lock opening gives you a key-operated way to keep access controlled. On the trade-off side, the per-string fuse rating is limited to the listed 15A holder spec (with 10A called out in the title), so if your panel strings are intended to run higher current, this configuration may not match your wiring plan. If you're running 10A strings, it offers six inputs for a moderate price.
Solar PV Combiner Box 4 String 15A for Solar Panel System Steel Case IP65 SPD
This 4-string box pairs a 125A main circuit breaker with 15A DC fuse holders, giving you a larger main-breaker capacity than the other four-string option in this group. The steel enclosure is described as 0.8 mm cold-rolled steel, and the title calls out IP65 plus SPD, so the housing and surge-protection angle are both part of the listing. It weighs about 12.23 lb, which is heavier than the 6-string LED-fuse box. The limitation is straightforward: you only get four inputs, so if you need to combine six panel strings, you would need to pair two of these or step up to a six-string box. Its lower price than the premium six-string unit makes it a reasonable pick when your string count fits.
PV Combiner Box, 6 String Solar Combiner Box with 15A LED Fuse, Lightning Arrest
This is the only one of the four with a built-in LED fuse indicator: the description says the indicator lights up when a fuse burns out, which can simplify maintenance. It includes a 63A circuit breaker and a 600V surge lightning protector, plus two replacement 15A fuses. It also comes with a pre-connected cable. At $161.99, it is the most expensive option here, so the extra cost goes toward the LED diagnostics and the included spares. The listed dimensions are larger as well (14.6 x 9.7 x 6 in). The trade-off is that you are paying a premium for convenience features, and if you do not need to monitor fuses visually, a more basic six-string unit costs less.
Solar Combiner Box PV Combiner 63A Circuit Breaker 4 String For Solar Panel Kit
The least expensive product in this group, at $62.54, is a 4-string combiner box built from ABS and PC material rather than steel. It has a 63A 550V circuit breaker, two surge protection devices, and a high-voltage lightning arrester, according to the product description. The white enclosure uses natural cooling and is listed as new. Because it provides four strings, it suits setups that need to combine four panel feeds without paying for more capacity. The limitation is the per-string fuse rating: the title calls out 10A rated current fuses, so this box is aimed at lower-current strings rather than higher-current modules. If your panel strings pull more than that, the 15A fuse options give you more headroom.
Pick by use case
- For six strings on a budget: Solar PV Combiner Box 6 String 10A Steel Case at $85.99, if 10A strings fit your array.
- For a large main breaker: Solar PV Combiner Box 4 String 15A Steel IP65 SPD at $78.84, with its 125A breaker.
- For LED fuse monitoring: PV Combiner Box, 6 String with 15A LED Fuse at $161.99, if the premium price is acceptable.
- For the lowest price: Solar Combiner Box PV Combiner 63A Circuit Breaker 4 String at $62.54, if four inputs and 10A fuses are enough.
