Excerpt
Not all composting toilets are built the same. Some models run fans, heaters, and evaporation systems that require a power source — others need nothing but gravity and airflow. Here's exactly what you need to know before you buy, and how to pair the right toilet with the right power setup from PowerGen Store.
By PowerGen Store · Composting Toilets · May 2026 · 9 min read
Quick Answer
It depends on the model — and the difference matters more than you'd think.
Some composting toilets (like the Nature's Head self-contained unit) are fully non-electric and work via passive airflow. Others, like Separett models, use a small fan and require a 12V or 110V power connection. At PowerGen Store, we carry both — and we can help you match either to the right power solution.
How composting toilets work
A composting toilet breaks down waste through aerobic decomposition — the same biological process that turns food scraps into garden compost. Oxygen, heat, and naturally occurring microbes convert solid waste into a dry, reduced-volume material, while liquid is either evaporated or drained away through a separate path.
The result, when managed correctly, is odorless and far less wasteful than a traditional flush toilet. There's no sewer connection needed, no septic system required, and water usage drops to essentially zero for waste disposal.
The two brands we carry — and what powers them
At PowerGen Store, we carry two trusted composting toilet brands: Nature's Head and Separett. They take very different approaches to power.
Non-Electric
Self-contained, gravity-fed design with a passive vent system. No power source required. Ideal for off-grid cabins, tiny homes, sailboats, and RVs without shore power. One of the most popular composting toilets in the US market.
Electric Fan
Swedish-designed urine-diverting toilet with a built-in fan for airflow and odor control. Runs on 12V DC or 110V AC. Better for year-round residential or cabin use with reliable power available.
Why the power question matters
The fan in an electric unit like a Separett does one critical job: it creates negative pressure inside the toilet bowl, pulling odors up through the vent stack and out of your living space. Without it, odor control depends entirely on a properly positioned passive vent — which works well when conditions are right, but can struggle in cold weather or low-wind conditions.
If you're going fully off-grid and don't want any electrical dependency, Nature's Head is the proven answer. If you have access to any power source — even a small solar setup — Separett gives you a more consistent experience with less hands-on maintenance.
Running an electric composting toilet off solar
This is where PowerGen Store's broader product lineup becomes genuinely useful. Electric composting toilets like the Separett draw very little power — typically between 2.5W and 10W for the fan, running continuously. That's less than a phone charger.
⚡ Power draw in context
A Separett fan running 24 hours uses roughly 60–240Wh per day. A portable solar generator from EcoFlow, Jackery, or Bluetti — even a compact unit — handles this easily alongside your other off-grid loads.
For a cabin or tiny home, pairing a composting toilet with a solar kit or off-grid kit from our store gives you a complete, self-sufficient system — no utility hookup required.
Which solar generator pairs well with a composting toilet?
For a Separett running on 12V, a mid-range portable power station is more than sufficient. The EcoFlow DELTA 2 Max or Jackery Explorer 1000 v2 both provide clean, reliable 12V output alongside enough battery capacity to power a full day of off-grid living. For permanent installs, a Sol-Ark inverter system with a Renogy or Epoch battery bank is the professional-grade solution.
When to choose non-electric
If power access is genuinely zero — a remote hunting cabin, a seasonal structure with no solar, or a sailboat far from shore power — Nature's Head is the right call. It's been installed in tens of thousands of off-grid applications and has a well-earned reputation for reliability with minimal maintenance.
The key requirements: a proper vent stack installed correctly (Nature's Head provides the hardware), regular addition of bulking material like coconut coir or peat moss, and occasional agitation of the composting chamber using the unit's built-in handle. In warm, dry climates these are easy habits. In cold or humid environments, expect to be more hands-on.
Frequently asked questions
Does the Nature's Head composting toilet need electricity?
No. Nature's Head is a fully self-contained, non-electric unit. It uses a passive vent pipe and naturally occurring aerobic decomposition. No fan, heater, or power source is required, making it one of the best options for true off-grid installations.
How much power does a Separett toilet use?
Separett models typically draw between 2.5W and 10W for the ventilation fan. Running continuously, that's roughly 60–240Wh per day — easily managed by even a small solar generator or a basic 12V battery system.
Can I run a composting toilet on solar power?
Yes, and it's one of the most common pairings in off-grid setups. Electric composting toilet fans draw so little power that virtually any portable solar generator or off-grid solar kit can handle the load. PowerGen Store carries solar generators, off-grid kits, and solar panels that work seamlessly with models like the Separett.
Which is better for a tiny home — Nature's Head or Separett?
Both work well in tiny homes. Nature's Head suits tiny homes with no power infrastructure. Separett is a better fit for tiny homes with even a modest solar system, as the fan provides more consistent odor control and the urine-diverting design simplifies liquid management.
Do composting toilets smell without electricity?
Not when installed correctly. Nature's Head relies on a passive vent stack — warm air rising through the pipe carries odors outside. In cold or still-air conditions performance varies. Separett's electric fan creates reliable negative pressure that works regardless of weather, making it more odor-consistent in all climates.
Are composting toilets legal?
In most US states, yes — and acceptance is growing rapidly. Regulations vary by state and county, and some jurisdictions still require a secondary wastewater system alongside the composting toilet. Always verify with your local health and building department before installing.
Ready to go off-grid?
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