Best Portable Generator Interlock Kits for Safe Home Backup
Finding the right generator interlock kit helps you safely backfeed your home during outages without risking backfeed into utility lines. The top picks below cover popular panel brands and common spacing requirements, making them suitable for most DIY installations. Ideal buyers include homeowners with Square D QO/Homeline or Eaton/Cutler Hammer BR panels, as well as renters or rural property owners needing reliable outages backup. The table below highlights five strong options with a quick compatibility snapshot.
| Product | Brand | Best For |
|---|---|---|
| Natupal Generator Interlock Kit | Natupal | Square D QO or Homeline 150–200 amp panels; 1 3/8″ spacing |
| QYZZRS Generator Interlock Kit (Square D QO/Homeline) | QYZZRS | Square D QO/Homeline 150–200 amp; precise installation guidance |
| EXCELFU Generator Interlock Kit for BR Series | EXCELFU | Eaton/Cutler Hammer BR 150–200 amp; flexible spacing |
| LiftCharger 30 Amp Hook-up Kit | LiftCharger | Square D Homeline 150–225 amp; portable generator to house hookup |
| XMK Siemens/Murray Interlock Kit | XMK | Siemens/Murray 150–200 amp; reliable 7/8″–1 1/4″ spacing |
Natupal Generator Interlock Kit for Square D QO/Homeline
The Natupal interlock kit is designed for Square D QO or Homeline panels rated at 150 or 200 amps with a 1 3/8 inch spacing between main and generator breakers. It offers a straightforward path to backfeed generator power to chosen circuits safely. Best for homeowners who already use Square D panels and want a ready-to-install solution. A potential limitation is alignment accuracy during installation; verify alignment before securing screws.
QYZZRS Interlock Kit for Square D QO/Homeline
This interlock kit covers Square D QO and Homeline panels at 150–200 amps with 1 3/8 inch spacing between the main and generator breakers. It’s well-suited for DIY households that want a compact, professional-looking installation with step-by-step notes. The kit’s installation note emphasizes aligning the interlock before drilling, which helps prevent misalignment and installation errors.
EXCELFU BR Series Interlock Kit for Eaton/Cutler Hammer
The EXCELFU interlock kit supports Eaton/Cutler Hammer BR and CH series (150–200 amps) with 1 1/4″–1 7/16″ spacing between main and branch breakers. It highlights safe backfeeding to maintain power to essential loads during outages. Installation notes include a drill bit and manual for easier setup. Choose this if you have Eaton BR/CH panels and want broader spacing tolerance.
LiftCharger 30 Amp Generator to House Kit
This kit targets 30-amp generators for Square D Homeline 150–225 amp load centers. It enables safe power transfer for a limited circuit set, avoiding full-house backfeed. It’s best for smaller generators or limited load scenarios. A limitation is the lower amperage, which may not meet higher power needs during outages.
XMK Interlock Kit for Siemens/Murray Panels
The XMK interlock supports Siemens or Murray 150–200 amp panels with spacing from 7/8″ to 1 1/4″. It helps prevent simultaneous main and generator power, directing generator energy to chosen circuits. It’s a solid option for non-Square D panels. Best for households with Siemens/Murray hardware or mixed-brand setups. A caution is to confirm model compatibility before purchase.
QYZZRS Homeline Meter Main Interlock Kit
This kit targets Square D Homeline meter main 150 or 200 amp setups. It includes screws, drill bit, and installation instructions to help align quickly and correctly. Best for Homeline users seeking a compact, professional interlock solution. Limitations may include the need for careful alignment and the availability of meter-main configurations in your panel.
Buying Guide
What panel brands and amperage do I need to match?
Interlock kits are brand- and panel-specific. Common options cover Square D QO/Homeline, Eaton/Cutler Hammer BR/CH, and Siemens/Murray. Most kits show compatibility for 150–200 amp panels. Confirm your exact panel model, main breaker type, and required spacing before purchasing.
How much spacing is required?
Spacing between the main and generator breaker typically ranges from 7/8 inch to 1 3/8 inches, depending on the kit. Accurate spacing ensures safe switching and avoids electrical conflicts.
What installation considerations matter?
Many kits require basic drill bits or screws, alignment checks, and careful sequencing during installation. Reading the included installation manual and following step-by-step guidance reduces the risk of improper wiring and ensures NEC compliance.
Which kit is best for limited power needs?
For smaller portable generators, a 30-amp kit (such as the LiftCharger option) may suffice, allowing selective circuit power. For whole-house or higher-demand needs, 150–200 amp kits from brands like Natupal, QYZZRS, EXCELFU, or XMK are better suited.
What are the safety considerations?
Interlock kits prevent simultaneous generator and main power flow, reducing backfeed risks to utility workers and appliances. Ensure generator power is coordinated with main breaker positions and that there is no loose wiring or exposed conductors during installation.
Frequently Asked Questions
- What is an interlock kit used for? It safely directs generator power to selected circuits while preventing backfeed into the utility grid.
- Which panels are most common for interlock kits? Square D QO/Homeline, Eaton BR/CH, and Siemens/Murray are among the most common.
- Do I need a transfer switch with an interlock kit? No, interlock kits provide an alternative to a full transfer switch by enabling selective backfeed.
- Can I install an interlock kit myself? Many DIY-friendly kits include installation guides, but ensure you have basic electrical knowledge and follow local codes.
- What spacing should I expect? Spacing typically ranges from 7/8″ to 1 3/8″ depending on the kit and panel model.
- Are there limitations to interlock kits? Some kits are limited to specific panel brands or amperage ranges; verify compatibility with your panel before purchase.