DC Cabling
DC Cabling
DC wiring includes the positive and negative conductors from the battery(s) as well as a disconnect device and
Do not route your DC wiring through an electrical distribution panel, battery isolator, or other device that will add additional voltage drops.
DC Over-Current Protection
Installation codes require
The following table outlines the minimum DC cable size and maximum fuse size required for some common installation codes. There may be other codes and regulations applicable to your installation.
| Marine Installation | RV Installation | Residential Installation | |||
| See footnote a. | See footnote b. | See footnote c. | |||
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Model | Wire Size | Fuse Size | Wire Size | Fuse Size | Wire Size | Fuse Size |
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Prosine 2.5/12 | # 2/0 AWG | 350A | # 3/0 AWG | 350A | 350 MCM | 350A |
Prosine 2.5/24 | # 4AWG | 175A | # 3 AWG | 175A | # 2/0 AWG | 175A |
Prosine 3.0/12 | # 3/0AWG | 450A | # 4/0 AWG | 450A | 500 MCM | 400A |
Prosine 3.0/24 | # 2AWG | 250A | # 2 AWG | 200A | # 3/0 AWG | 200A |
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a. Based on ABYC Recommended Practice
c. Based on NFPA 70, Article 240 and 310, 75C wire, wire in conduit. If your installation code allows you to wire in free air, then the following table applies. NOTE: This table applies to residential installations only.
Model | Wire Size | Fuse Size |
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Prosine 2.5/12 | # 3/0 AWG | 350A |
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Prosine 2.5/24 | # 2 AWG | 175A |
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Prosine 3.0/12 | 250 MCM | 450A |
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Prosine 3.0/24 | # 1 AWG | 200A |
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What the above tables do not take into account, however, is voltage drop associated with greater cable lengths. It is always best to use oversize cables to reduce voltage drop and improve inverter performance.
46 | Prosine Installation & Operation Guide |