FLEXware PV Combiner Box

The OutBack Power FWPV-12 FLEXware PV Combiner Box is a versatile, heavy-duty balance-of-system solution designed to protect and combine up to 12 solar strings. Built to accommodate both low-voltage systems (using circuit breakers) and high-voltage grid-tie systems (using fuses), this unit serves as the central hub for your PV array wiring.

Unlike the smaller 6-string ICS model, the FWPV-12 offers greater capacity and flexibility, allowing for dual output circuits and a wider range of wire sizes, all housed in a rugged, powder-coated aluminum enclosure.

Product Overview

• Model: FWPV-12
• Max Capacity (Breakers): 12x 150VDC Breakers (Sold Separately)
• Max Capacity (Fuses): 8x 600VDC Fuse Holders (Sold Separately)
• Enclosure Rating: NEMA 3R (Rainproof / Outdoor)
• Output Circuits: Configurable for 1 or 2 Separate Circuits
• Material: Powder-Coated Aluminum
• Mounting: Wall, Pole, or Sloped Roof (up to 14°)
• Weight: 5.9 lbs (2.7 kg)

Why Choose FLEXware FWPV-12

The FWPV-12 is the “universal soldier” of combiner boxes. Whether you are building a 48V off-grid cabin using 150V DC breakers or a high-voltage grid-tie array using 600V fuses, this box handles both. It features a unique “angled” negative busbar design that solves the common headache of thick output cables blocking access to the smaller input wires, making installation significantly faster and cleaner.

Frequently Asked Questions

Q1: Does this come with the breakers or fuses included?

No. The FWPV-12 is the enclosure and busbars only. You must purchase the specific 150VDC DIN-rail breakers or 600VDC fuse holders separately to match your system’s voltage and current requirements.

Q2: Can I combine two separate solar arrays in this one box?

Yes. The FWPV-12 can be configured for two separate output circuits. For example, you could have 6 strings combined into Output A (going to Charge Controller 1) and another 6 strings combined into Output B (going to Charge Controller 2).

Q3: Is this box waterproof?

It is NEMA 3R Rainproof. This means it protects against falling rain, sleet, and snow. It is designed for vertical mounting (wall/pole) or sloped roof mounting. It should not be mounted flat on its back or submerged.

Q4: What is the maximum wire size for the output?

The main output lugs are massive—they can accept up to 2/0 AWG cable, which is excellent for long wire runs to minimize voltage drop.

Q5: Can I mix fuses and breakers in the same box?

Technically, the DIN rail fits both, but mixing voltage levels (150V vs 600V) in the same enclosure is generally against code and unsafe. You should choose either the breaker configuration (low voltage) or the fuse configuration (high voltage).

If you have any questions about the item or your order, please feel free to message before purchasing. Thank you!