Newmar GI-30 Galvanic Isolator
Newmar GI-30 Galvanic Isolator — Product description
Boat owners know the frustration of watching sacrificial zincs dissolve faster than expected, leaving thru-hulls, shafts, and props vulnerable to electrolysis. The culprit? Stray low-voltage currents sneaking through the connection between your boat's AC safety ground and DC bonding system. Enter the Newmar GI-30 Galvanic Isolator—a reliable barrier that stops this galvanic corrosion in its tracks without compromising your safety ground path.
Designed for cruisers, sailboats, and yachts drawing up to 30 amps from shore power, this compact unit slashes zinc replacement costs and haul-out expenses. Its built-in capacitor adds an extra layer of protection, offering a low-impedance route for AC faults to reach ground instantly. Whether you're docked at a busy marina or exploring coastal waters, the GI-30 keeps your underwater metals intact longer.
Why Your Boat Needs a Galvanic Isolator Like the Newmar GI-30
- Corrosion Prevention: Blocks DC stray currents up to 1.4V, extending zinc life and protecting vital components from pitting and erosion.
- Safety First: Fail-safe design maintains ground connection even if diodes fail, meeting ABYC A-28 standards and UL1500 for ignition protection.
- Versatile Power Handling: Works with 115/230V AC, 50-60Hz shore power—perfect for US, European, or global cruising.
- High-Temperature Resilience: Tested to 50°C ambient, it performs reliably in engine rooms or sun-baked compartments.
- Space-Saver: At just 2.7 x 4.8 x 7.3 inches (6.9 x 12.2 x 18.5 cm), it fits tight AC panels without hassle.
- Cost Efficiency: Fewer zinc changes mean more time on the water and less wallet drain.
Unpacking the Engineering Behind the GI-30
At its core, the GI-30 uses back-to-back diodes to isolate low-voltage DC while passing high-voltage AC faults. This diode bridge drops stray currents effectively, but what sets Newmar apart is the fail-safe mechanism. Should the diodes short (a rare event), the ground path stays open—no interrupted safety.
Real-world mariners report zincs lasting 2-3 times longer post-installation. Pair it with a proper bonding system, and you're golden. Unlike basic isolators, this one's robust construction handles 5000A short circuits, giving peace of mind during storms or surges.
Easy Installation for DIY Boaters
Mounting the GI-30 is straightforward—secure it near your shore power inlet or AC distribution panel. Disconnect shore power, cut the green ground wire from inlet to panel, and insert the isolator inline. Torque connections to spec (usually 20-25 in-lbs for #10 wire), and test with a multimeter for continuity on AC faults above 4V. Always label it clearly and consult your boat's wiring diagram. Pro tip: Add a ground fault detector upstream for full marina compliance.
Technical Specifications at a Glance
| Specification | Details |
|---|---|
| Model | GI-30 (Fail-Safe) |
| Shore Power | 115/230V AC, 50-60Hz, 30A |
| Stray Current Block | Up to 1.4V DC |
| Short Circuit Rating | 5000A |
| Dimensions (H x W x D) | 2.7 x 4.8 x 7.3 in (6.9 x 12.2 x 18.5 cm) |
| Weight | 2.45 lb (1.1 kg) |
| Certifications | UL1500, ABYC A-28, Ignition Protected |
| Operating Temp | Tested to 50°C ambient |
Long-Term Maintenance for Peak Performance
Once installed, the GI-30 is mostly set-it-and-forget-it. Inspect connections annually for corrosion, and test diode function with a galvanic isolator tester (checks voltage drop). Monitor zinc anodes quarterly—slower wear confirms it's working. In high-salinity areas, rinse the exterior if salt builds up. Avoid undersized wire; use at least 10 AWG for grounds.
Frequently Asked Questions
Investing in the Newmar GI-30 isn't just about corrosion control—it's about extending your boat's life and your enjoyment on the water. Join countless skippers who've cut maintenance headaches and boosted confidence at the dock.
NewMar GI30 Attributes
Galvanic Isolator
Sacrificial zincs corrode away as they protect metal thru hulls, shafts and props from damaging electrolysis. Stray, low voltage current flowing between the AC safety ground and DC bonding system is a principal cause of this "galvanic" action.
Installing the Galvanic Isolator between the AC safety ground and DC bonding system, blocks a majority of the low voltage currents and corrosive action on the zincs is significantly reduced (while the integrity of the critical safety ground path is maintained.) This means a significant savings in boat haul-out fees and zinc replacement costs.
For additional safety, both units feature a large capacitor, providing a secondary low impedance path for sending AC current to ground.
| Model | Shore Power VAC, Hz | Shore Power Rating, Amps | Dimensions | Weight | ||||
| H | W | D | lb. | Kg | ||||
| GI-30 | 115/230, 50-60 | 30 | 2.7 | 4.8 | 7.3 | in. | 2.45 | 1.1
|
| 6.9 | 12.2 | 18.5 | cm. | |||||
| GI-50 | 115/230, 50-60 | 50 | 4.5 | 4.7 | 8.9 | in. | 3.2 | 1.5 |
| 11.4 | 11.9 | 22.6 | cm. | |||||
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SKU: NVN-1001169
MPN: GI-30
UPC:
Technical specifications
| Brand | NewMar |
| Model | Newmar GI-30 Galvanic Isolator |
| SKU / MFR# | 1001169 |
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Frequently asked questions
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