Micro-hydro basics for off-grid power
Learn the core sizing equation, what “head” and “flow” really mean, and how to estimate watts you can actually get.
Read the micro-hydro guide →
DIY energy & off-grid experiments
DIY off-grid energy experiments
Real-world experiments that help you understand energy, power, storage, and losses. No "free energy" claims — just practical, physics-based projects that pair well with solar.
How to use this pillar
- Estimate the power you can realistically make.
- Decide what you will charge (battery) or run (loads).
- Design for safety: fusing, wire size, disconnects.
Experiment guides
Long-form, evergreen guides with realistic calculations, limitations, and safety notes.
How to choose the right experiment
Start with the energy source you actually have access to. Flowing water, wind exposure, and available space matter more than the idea.
- Reliable water: micro-hydro and water wheel projects are often the most consistent.
- Consistent wind: small wind or Savonius experiments can teach real limits.
- Human-powered: pedal or hand-crank builds are great for learning, not daily energy.
Pedal power generator for battery charging
A realistic, safe approach to turning human effort into stored energy — and why it’s best as a teaching tool, not a primary supply.
Read the pedal power guide →DIY small wind turbine for battery charging
How to think about siting, tower height, dump loads, wiring protection, and realistic output (Wh/day) instead of optimistic rated watts.
Read the small wind guide →DIY thermoelectric generator (TEG) for battery charging
Turn waste heat into electricity using the Seebeck effect. Realistic wattage expectations, temperature difference requirements, and safe woodstove mounting.
Read the TEG guide →Gravity battery for energy storage
Store energy by lifting weights. Learn the physics (mgh), energy density vs chemical batteries, and why it's best as an educational experiment.
Read the gravity battery guide →DIY Stirling engine generator
External combustion thermodynamics: Carnot efficiency limits, realistic power output, heat source options, and coupling to a generator safely.
Read the Stirling engine guide →Multi-source hybrid charge controller
Combine solar, wind, and hydro safely. Controller selection, dump load wiring, parallel charging architecture, and voltage regulation strategy.
Read the hybrid system guide →DIY flywheel energy storage
Learn rotational energy storage with safe low-speed builds, realistic watt-hours, and the math that keeps expectations honest.
Read the flywheel guide →DIY compressed air energy storage (CAES)
Understand why CAES is hard at small scale, where the losses come from, and how to run safe, measurement-driven experiments.
Read the CAES guide →DIY hand-crank generator for emergency charging
Realistic wattage expectations, safe charging architecture, and wiring protection for phones, radios, and small battery top-ups.
Read the hand-crank guide →DIY water wheel generator (low-head stream power)
When you don’t have much head, a water wheel can still teach real physics — and sometimes trickle-charge a battery bank.
Read the water wheel guide →Treadmill motor as a generator
Use a PMDC motor as a generator for pedal, wind, or water experiments — with voltage vs RPM intuition and safe regulation.
Read the treadmill motor guide →DIY Pelton turbine pico hydro
Build a simple high-head pico hydro turbine for learning: nozzle basics, runner concepts, real watts from head + flow, and safe battery charging.
Read the Pelton turbine guide →DIY Savonius wind turbine (vertical axis)
A safe, measurement-first VAWT build: why it’s torque-rich but efficiency-limited, plus realistic Wh/day expectations and protection.
Read the Savonius wind guide →DIY supercapacitor bank for solar buffering
Learn what supercaps are good for (surges, short buffers), how to size with E=½CV², and how to build safely with balancing + precharge.
Read the supercapacitor guide →DIY car alternator generator for battery charging
Why alternators disappoint at low RPM, how field excitation and pulley ratio affect output, and how to wire charging safely.
Read the alternator guide →DIY generator test bench (watts + Wh/day)
A reusable measurement-first setup: load testing, RPM tracking, safety wiring, and how to estimate real daily energy from experiments.
Read the test bench guide →DIY dump load / diversion control (wind + hydro)
Protect batteries when turbines keep producing: how diversion works, dump load sizing (P=V²/R), wiring patterns, and heat management.
Read the diversion guide →DIY buck/boost regulation for variable generators
Turn variable generator voltage into stable charging: buck vs boost vs buck-boost, CC/CV basics, protection, and common failure modes.
Read the regulation guide →Pair experiments with solar
DIY generators are usually small. Solar + battery storage often gives the best results for cost, reliability, and safety.
Use experiments to learn what is possible, then size a practical system around the energy you can reliably produce.
Measure first, then build
Many DIY projects fail because the input energy is overestimated. Start with basic measurements and realistic assumptions.
A single afternoon test can mislead: output varies with wind, water flow, and temperature. Short logs and repeated measurements show the true range before you buy parts.
Document the setup, RPM, and load so you can repeat the test or share results with others.
Keep notes in a simple logbook for later comparisons.
Measure power and energy
Track watts, voltage, and current so you can estimate watt-hours per day. Small gains can add up, but only if you measure consistently.
Plan for losses
Friction, electrical conversion, and battery charging losses reduce usable energy. Build these losses into your expectations.
Recommended prerequisites
These existing guides help you pick the right battery voltage, wire size, and protection.
Battery capacity
Estimate how much storage you need for your loads and desired backup time.
Use the battery calculator →Wire size
Small DIY projects still need correct wiring to avoid heat and voltage drop.
Pick wire size →Fuses & breakers
Protection choices for DC systems: fuse/breaker sizing and placement.
Size protection →Legal and site constraints
Some experiments require permits, water rights, or safety clearances. Always check local rules before installing anything permanent.
Water access
Micro-hydro and water wheel projects often require permission to divert or use water. Respect local regulations and environmental rules.
Noise and safety
Wind and generator experiments can create noise or rotating hazards. Use guards, signage, and safe clearances.
Ground rules (so this stays useful)
DIY is great when you stay honest about losses and limits.
No overunity / “free energy”
If a device claims more energy out than in without an external source (sun, water flow, fuel, wind), it’s not a real power source. This pillar focuses on proven energy sources and realistic conversions.
Safety first
Electricity, spinning shafts, water intakes, and batteries can all injure people or start fires. Use proper protection, follow local codes where applicable, and stop if you’re unsure.
Project safety checklist
Before you build, make sure you can control risk.
Electrical safety
Use fuses or breakers, cover terminals, and avoid live work. High current can be dangerous even at low voltage.
Mechanical safety
Guard rotating parts, secure mounts, and keep bystanders away from moving components.
Start small
Begin with a low-power prototype to validate your assumptions before scaling up.