From SHA2017 Wiki
Revision as of 09:40, 2 August 2017 by Webmind (talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Village Name Energy


Generated SHA Flag (experiment here)
Part of Cluster Cluster:AltPwr.Net

Add.png create cluster

Assigned Field Lamarr Field
Description 42V central station, here you can get some kits to protect your equipment in case a DCDC gets fried.

Edit your membership on your user page, here, and then on "edit with form" at the top.


Add.png create project

Self-organized Sessions

Add.png create self-organized session

Interests dc
, microgrid
, alternative power sources
alternative power sources
, 42v
, solar
, wind
Registered on 13 February 2016 21:05:51
Hosts self-organized sessions No
Other villages by tags...

Name Arrival Departure Bringing
flokli Verfied.png Thu Aug 3 18:00 Tue Aug 8 0:00 Bag full of cables and electronic foo, Gin, Racebike, Laptop
1 inhabitants. Refresh this list. You can add yourself to a village by editing your profile page, here.
Orga contact
Needs network Villages describe network needs
Needs power
Power comment
Village plans ... bring some special machines, ... have any other unusual installations, ... bring/build big stuff
Village constraints
Village comments plans
Provides transport for
Has plans with tracks
Size needed
Has order interest
Planning notes

The idea is that we create a metropole containing villages / people with tents that all use 42VDC (+/- 8V) as only power source. This "village" is the central station.

Some info about the DC grid:


  • Because power hacking is COOL!
  • DC grids are HOT!
  • <50(60)VDC is relatively safe.
  • You can connect your:
    • Wind generators
    • Solar cells
    • Woodgas generator
    • Electrical bacteria soup
    • Hamster wheels
    • Fitness gym equipment
    • Pocket fusion generator


Benadski has a plan and much stuff prepared already, it will be finished in time. Contact him for the details in the RevSpace IRC channel, or read on.

The grid will be:

  • Safe
    • ELV (a voltage not exceeding 42.4 Vac peak or 60 Vdc) is safest thing fiddling with, we will limit it to 50V.
    • Grid cable strands are individually fused, negative side is earthed (PELV).
    • Circuit breakers are all DC rated 400V
    • The high current side is not accessible for end users
    • The incoming 400V part is also shielded

  • Accessible
    • Not too expensive converters are tested, see the website.
    • Connecting is painless for end users, just connect a cable to one of the 4A circuit breakers and turn it on.
    • High power connections for villages are available, use of one or two 16A connections should be no problem, more needed? Just ask.

  • 24/7 powered
    • Power transformer(s) for power when clean power is depleted (no sun / wind etc.) ←Benadski already has a 15kW power supply!
    • Maybe some kinds of power storage solutions. If you have an idea, please build&bring!

  • Simple and robust
    • Cables are able to handle more power than needed (unless you are really power hungry, in that case a circuit breaker will alert you. :P)
    • A shorted or disconnected main cable will not affect the rest of the grid much, it's built of triangles!

  • Smart?
    • Voltage dependent power, users can control when they use power just looking at the grid voltage. A converter can auto-start when there is plenty of power for instance.
      • 42V is the magic number, above this number means there is clean power available, below 42V means running on diesel.
    • Some statistics will be recorded, but not down to village/user level. If you like to log/upload your statistics, use the mqtt server!
    • Maybe somebody can build a nice dashboard thingie.

Numb3rs and sort of facts:

(all are sucked out of my thumb): ←I know, I know that's not an English expression (yet!) But used in many other countries, so: adapt! :P

  • 42VDC? (range 34-50V, some safety to make sure >60V will never be reached) (42V is 7 6V batteries in series)
  • 4A per user (enough for charging laptops, having blinkenlights etc.), average use under 0,667A
  • 16A to 32A per village (to power a fridge, 4 laptops and lots of lights and/or audio), avg 6A
  • Power generation, 32A max. 4 connections totaling 64A max. per power node. ZB: 32+19+1+12
  • 300 users * 0,667A + 10 villages * 6A = 260A. 260A * 42V => 11kW average usage, estimated peak 15kW.
  • 5x6mm2 cables are used between nodes Each wire is protected by a 32A class C circuit breaker.
  • PTC fuses are excellent for user end protection, cheap and will auto reset.
  • Battery backup / stabilizer idea: 7x6V 10Ah at every node of the grid. Decouples below 35V, starts charging again above 42V. Maybe bigger one at the center of the grid, 12Ah or higher
  • We have a 220W load for destroying excess power when >48V is reached at each node. And a powerful circuit breaker tripping device to disconnect a node if >50V might occur.

Wild ideas next!

  • Water tower for storing energy and big-ass stat display. (Energy capacity fairly low)
  • Big crane structure lifting / lowering a concrete weight or an old car to store / deliver power (didn't calculate the capacity).
  • A woodgas generator delivers semi clean power to the grid.
  • Biogas generator (from local biological waste like dead food, NOT from feces and/or pee) ←This could create horrible stench, please don't!
  • Electrical bacteria farm (
  • Bicycle gym with generators (near showers please!)
  • Design nice converters people can buy for little money (open hardware):
    • >36V => 19V / 12V / 5V for powering stuff, with grid status outputs
  • Data over power, for general grid stats or other cool things.←Will be implemented!
  • Use the motion of people to generate power somehow. (children's playground power / walkways)
  • Store excess energy in water heating for dish washing / showering, pre-heated water needs further heating before it's used.

'High' voltage DC interlinks (a.k.a. decentralized nanogrid)

For anything past ~ 20 meters, low voltage DC becomes effictively unfeasable using thin cables. Meaning, you could wire up maybe to tents but not really set up any larger energy sharing structure. However, there are bidirectional converters between 48 VDC and 380 VDC that would allow creating a proper grid with minimal required architectural input. As AC cables are safe for these DC voltages as well, this would allow for essentially a plug and play type of grid.

So what needs to happen to get this implemented in the future?

  • Buy/beg/borrow some of these devices
  • Find a simple DIY way of wiring up proper fuses/spark detectors

In this case it would be cool enough just to have two 48 V systems connected over a single 380VDC line, as the worlds first prototype of a truly decentralized DC grid.

Sounds interesting? Want to work on this? More feedback? Contact DokterBob and/or look at this hackpad with prior research and at this article