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TAG: energy

Another ARA-2000 rebuild and LNA approach

It's always rewarding to see that distributing and sharing open knowledge & tools ultimately leads to much more individual empowerment and faster technological evolution/innovation than “protection” of “Intellectual Property” ever could: OK3ZB copied and used the AWRA-Cutting-Helper, did a successful rebuild of the Active-Wideband-Receiving-Antenna and came up with a new LNA approach:

Aquarius (Landing-Module)

Vehicle The Aquarius (LM) is a trailer, pulled by the Odyssey (CM) to a designated deployment area. It will serve as a means of transporting all the tools and infrastructure while travelling from one location to another and as a combined workspace/habitat for hackerspace/fablab operation.

Auxiliary Power Unit

The Auxiliary Power Unit (APU) is the fourth column in the group of independent and mobile energy sources. In case of over-budget power demand or a longer period of heavy weather (no sunlight for days), the APU will supply the batteries with power, generated by a small internal combustion engine.

Blu-Ray nanopatterns to boost solar (PV) efficiency

There are often reports about breakthroughs in alternative technologies and when I look, I can find charts claiming that in 2014/2015 top solar conversion efficiency is reported to be at about 45%. However, when I look harder I don't seem to find obtainable Panels above 21%. The highest grade I could get were the Mobile Technology MT-ST110 panels on the Odyssey (Command-Module). I can't help but to ask myself:

Clear-Sky Solar Prediction: First Test-Results

Since it's currently winter in central Europe, it's the perfect time to evaluate the Unified Clear-Sky Solar output Prediction Model for its feasibility/validity. After bringing the VFCC online, it was a simple task to ship prediction metrics and reference measurements into influxdb and create a couple of dashboards to create meaningful graphs to evaluate its performance very easily.

D-Link "green-ethernet" switch Review

Labeling things with the term “green” has become quite popular these days. While evaluating unmanaged SOHO Gigabit-Ethernet switches for Apollo's core net-infrastructure, a lot of “green” switches turned up. After sifting through numerous datasheets D-Link's DGS-1008D seemed to be the top choice when power consumption is an issue.


* Multi-Stacking Modules * Build a common model for generator scaling according to rotor size * The generator module should always be at the bottom of the mast, reducing the top load of the mast and also making the generator more accessible for maintenance.


The goal of this project is to develop a robust, versatile and resource-effective biomass micro-gasifier by combining a controlled-draft TLUD (Top-Lit Up-Draft) gasifier with an array of TEGs (Thermo Electric Generators) and a microcontroller to optimize the gasification process.

Is burning wood bad?

So called “environmentalists” often claim that burning wood is “evil” but mostly forget in their argument, that domestic energy has to be produced somehow for humankind to survive. There is nothing evil about burning wood, quite the opposite in fact, wood can be a renewable energy source, when used properly. Simply put: To keep it sustainable, it's important not to burn more wood than nature is able to reproduce (i.e. grow trees) and to increase the amount of usable energy that can be harvested.…


Standard-Parameters Maximum assembly height The complete assembly of rotor and mast should not be higher than 10 m. If regional communities permit higher masts, the maximum height must not exceed 20m, to avoid national and ICAO air traffic security issues and legal obligations to carry warning lights and report about their functionality.

Motor-Porn: Honda GX25 moved into new APU rig

What started out as a simple thread on a mobile-home board, ended up in more than 50 pages of discussion about a neat and small generator project based on a Honda GX25 and a Torcman 430-30 brushless outrunner motor. Some people always seem to ask, why anyone would build something like that, if they could get more output power for less money from a ready made product? Because available products don't really match the requirements and why would anyone pay money for something one actually doesn't r…

Odyssey (Command-Module)

Vehicle Vehicle Specifications Attribute Value Schematics Model V 220 CDI Motor OM 611 DE 22 LA Capacity 2148 cm³ Cylinder/Valves R4/16 Power @ min-1 90 kW/3800 Torque @ min-1 300 Nm/1800–2500 Build 2002 HSN 0710 TSN 558

Pelton-Turbine calculations

ParameterSymbol/RelationshipUnitNotesJetspeedm/sDue to friction losses the jet will be 2-4% slowerHeight/Headm Earth Gravitationm/s²9,81 m/s²Turbine RPMrad/sOptimum RPM is about 2-10% lowerJet-Turbine RadiusmCenter axis to cup centerJet cross-sectionm²adjusted by nozzleWater volumem³/s Jet diameterm Cup heightm+/- 12% tolerance in construction energy pelton turbine

Project Release: UCSSPM

The Unified Clear-Sky Solar output Prediction Model is an open-source clear-sky prediction model, incorporating math algorithms based on latest research by the Environmental and Water Resources Institute of the American Society of Civil Engineers and a few veteran but still valid and publicly available NOAA/NASA computations. It has been around for a while but received a major revision, code refactoring and got bumped to primary project status, since it's becoming an essential tool in predicting…

Review: Managed Low-Power Switch DGS-1100-8

In a past Mission-Log, we've reviewed the power consumption of "green" Ethernet Switches (consumer-grade/unmanaged) that could be used in off-grid environments and they performed really well. Compliant with IEEE 802.3az Energy Efficient Ethernet, these switches consume less energy by cutting down on power consumption when the traffic volume is low and automatically measure the length of the connected cables to adjust power usage, when cables are shorter than 20 meters. In addition, they monitor …


Compared to drag-only type rotors (Savonius), lift-only type rotors (Darrieus) have been proven to be generally less suitable for low wind environments since they're difficult to start up. The maximum speed of drag-only type rotors is always lower than a comparable lift-only type rotor, because a lift-only type rotor can rotate faster than the wind speed at the tips but with less torque. However, the Gorlov rotor with a NACA 0015 airfoil may be a very well suited lift-type rotor for small-scale,…

The evolution of fire

Open Fire Stove Hobo/Rocket-Stove <> TLUD Natural Draft (ND) Forced Draft (FD) Controlled Draft (CD) energy helios research tlud biomass

The Illuminator - A LED Light built from trash

Building things can be a lot of fun. Even more so, if the parts you use are things, that other people threw away. A while ago, the workbench needed a more appropriate lighting and 3 Luxeon 1W LEDs were lying around in the MISC box, other parts were collected from trash found in containers.


The Tiny Vertical Axis Wind Turbine is a prototyping model for the Zephyr Wind-Park Construction Kit. Prototyping Gathering the material for the first prototypes. Do you have something available for this project? Please add yourself to this list and describe the parts, tools or experience you have to share.

Unified Clear-Sky Solar output Prediction Model

Using the sun as a sustainable energy source isn't really a new invention. Plants have been relying on it for millions of years and have developed and optimized the process of photosynthesis over a very long bio-evolutionary period. Almost everybody appreciates the comfort, when it's warm and the sun is shining but we very often forget how hard our ability to actually survive as a species, is linked to solar output:


Megawatt scale HAWT grid-tie windparks are operating at optimum height in specific areas, with strong and mostly continuous winds. This makes their development, construction and maintenance very labor- and resource-intensive projects and causes much inflexibility in the process of finding a suitable location for deployment and operation.