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    SKU: SM-EXCN-FT
    Excel NE — non-electric high-capacity self-contained composting toilet for off-grid sites where you want Excel-style capacity without relying on mains power.

    Choose the Product options below

    *

    Choose the fan voltage to match your power system.

    ABS pipe (US spec) is supplied with the toilet. This is suitable for straight horizontal vent stacks.

    If you'd like to adapt the unit to NZ pipe, please select this kit. You will need NZ pipe if you're looking to create elbows and bends.

    *

    You may need additional vent materials depending on how many storeys your building has.

    Single Storey buildings with a high-profile roof (A frame or mono-pitch) require extra lengths of vent pipe - add one 800mm Vent Pipe Extension

    Double Storey buildings require extra lengths of vent pipe. Please add 4 x 1m Vent Pipe Extensions.

    Double Storey building with a high-profile roof (A frame or mono-pitch) require extra lengths of vent pipe - add one 800mm Vent Pipe Extension

    Kit for stepping the vent stack around the eaves of the roof. Allows you to avoid penetrating the roof.

    A wind-driven vent offers the best redundancy for your system ventilation. The wind-driven vent will assist the fan under heavy wind conditions, keeping the system operational in the event of a power outage or fan failure.
    SharkVent™ | Wind Ventilator has high efficiency with a linear wind direction windvane (good for storm-prone areas).
    Universal Vent ACC | Wind-Driven Vent has high efficiency in low windage. 2 colours: white or black.

    Select this reducing collar to adapt the vent from 150mm to 100mm.

    Select this reducing collar to adapt the vent from 150mm to 100mm.

    Select this reducing collar to adapt the vent from 150mm to 100mm.

    Extend your soft connection leachate drainpipe to reach your hard connection leachate drainpipe or soak-pit/trench.

    Soft connections allow for flexible placement of the composting tank in relation to a hard connection or drain.

    The system is packed with 1 meter of 25mm leachate drainpipe as a standard.

    Extend your leachate drain via in-ground hard connection to reach your soak-pit/trench (soak-away).

    Most soak-aways should be installed 3 meters away from the foundations of the structure but this remains circumstantial to the site.

    Run your leachate drain into a soak pit (vertical soak-away) or into a trench (horizontal soak-away).

    Availability: 2 in stock
    $4,041.32 excl GST
    excluding shipping
    Estimated delivery time: Approx. 1–2 weeks (NZ-wide)
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    Sun-Mar™ | Media
    Sun-Mar™ non-electric self-contained composting toilet

    Sun-Mar™ | Excel NE

    A larger self-contained composting toilet designed for off-grid sites where dependable mains power is not available.

    Excel NE combines Sun-Mar™ BioDrum™ composting with a non-electric operating pathway for cabins, baches and remote properties.

    Full-time
    2 Adults
    Or families of 3
    Seasonal
    5 Adults
    Or families of 7
    Power
    Non-Electric
    No fan or heater as standard
    Format
    On Floor
    Self-contained system
    Product background

    Higher-capacity self-contained composting for off-grid sites

    Excel NE uses the same BioDrum™ composting principle as the powered Sun-Mar™ range but is configured to operate without a heater or powered fan as standard.

    This makes it particularly useful where a larger self-contained toilet is required but a permanent 240V supply is unavailable or undesirable.

    How it works

    Compost, manage moisture naturally and finish

    Stage 1 Compost

    Waste and bulking material enter the BioDrum™, where rotation mixes and aerates the composting material.

    Stage 2 Manage moisture

    Natural ventilation through the larger vent pathway supports moisture removal, while the drain manages liquid that is not evaporated.

    Stage 3 Finish

    Compost progresses into the finishing area before final removal from the toilet.

    Core product details

    Designed around natural draft

    • Patented Sun-Mar™ BioDrum™ composting technology.
    • Non-electric composting design.
    • No heater required as standard.
    • No powered fan required as standard.
    • 4-inch PVC vent pipe supplied.
    • 1-inch drain required and supplied.
    • Optional 12V or 24V fan can be added where additional airflow support is needed.
    • Best performance with a straight vertical vent and good natural airflow.

    Installation note: non-electric operation makes correct vent design especially important. Review the available vertical vent route before choosing Excel NE.

    Certification

    NSF performance certification

    NSF/ANSI 41 — Non-Liquid Saturated Treatment Systems

    The supplied Sun-Mar™ information identifies independent testing for liquid containment, odour performance and solid end products.

    NSF: What you need to know about composting toilets

    NSF composting toilet information

    WCTNZ® is an authorised New Zealand supplier of Sun-Mar™ composting toilet systems. Local support is available for system selection, installation information, consumables and after-sales requirements.

    Excel NE or Excel 240?

    Excel NE is the off-grid pathway where natural ventilation and low electrical demand are priorities. Excel 240 adds powered ventilation and evaporation where reliable mains power is available.

    Before you choose, think:

    1. Your place — tiny home, bach, family home, RV, or public site

    2. Your building — whether it suits a self-contained or split composting toilet system

    3. Your needs — user numbers, maintenance preferences, and how off-grid you want to be

    To narrow it down properly, start with the Composting Toilet Guide .

    Open the WCTNZ® Selector Guide »

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