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Revision as of 20:04, 29 December 2020 by Chewie (talk | contribs) (2nd meetup notes, day 3 of CCC)
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First Meeting - Day 2 (2020-12-28)

EventGrid // DC MicroGrid Meetup Day 2

Charge Controller - https://www.western.it/en/products/wrm15-dual-battery/ - looks good, but android app is useless, and their support is not helpful in fixing the problem. comments in the Italian play store also say it doesn't work, and has a poor rating.

  • bitsandbytes: interested in how camp solves power
  • mc_leeck: interested mostly in motors, but looking at the power side of things as well
  • cfr34k: interested in ren. energy, esp. solar power. had built an mppt charger (12V,50W).
    • not really documented, but would build it similar to the LibreSolar MPPT 12V 10A device (see below)
  • HeNeArXn: just checking in what has happened

notes from camp: https://altpwr.net/index.php?title=Main_Page#CCCamp_2019

interesting MPTT modules: https://libre.solar/devices/mppt-1210-hus/

Projects by OpenGreenEnergy:


Benadski and doktorbob

  • Old Website was interesting, but seems gone

tiefpunkt talks about GC-90 power meters


shows 7S LiPo board (sort-of matches 24V lead)

MCH 2021

  • Do a village or cluster close together so we can test our setups
  • Benadski involved in the power grid

Second Meeting - Day 3 (2020-12-29)

EventGrid // DC MicroGrid Meetup Day 3

  • Martin: Libre Solar
    • DC Grid for Rural electrification

-> today: tiny home systems, >=50W, usually proprietary -> Interconnect those systems?

  • Test run in UK, w/ 4 participants
  • Project planned in Ruanda
  • Some of the developments are supposed to go back into Libre Solar
  • Solar charger 12V/24V, grid 48V
  • Working on new version of the 20A controller, potentially available ready built then. ETA maybe Jan/Feb 2021 - Martin will post costs in Telegram channel if anyone would like to order one. The more orders, the cheaper it will be, although there is no minimum order.

Plans for a bigger charge controller (120V input) for wind generators (https://windempowerment.com/) -> Send a message to Martin if you want to be involved

  • Has some 400WH second-hand e-scooter batteries he wants to use but has not had time yet.

hk: modular battery based on 18650s in euroboxes, with DC-DC charge controllers for each box. Has a lot of 18650 batteries for use in a battery system.

DC-DC usually one low-voltage side, one high-voltage side, so it's easer to have a 48V grid with a 24V battery. Adapting a 48V battery to a 48V grid is much harder.

DC-DC-Converter by Zoe and Elen https://fully.automated.ee/raccoon.html https://twitter.com/tachiniererin/status/1343955837258248192

Festival Grid - Power metering using tasmota-compatible smart home devices. Might be also possible for 48VDC

Old AltPwr Website

Monthly/bimonthly meetings to prep for MCH

  • Make a list of stuff people can bring
  • tiefpunkt will set something up and post it in the telegram group

Open source DC-DC converter for "small" power sources

Portable power-mesh nodes

  • based on hk's battery modules
  • Goal Zero Yeti do some "meshing" which is more a daisy chaining, but isn't very efficient. The systems do communication between each other, probably via the charging cable.

Jeremail: Has a small setup with multiple dc-dc-converters Could e-bike batteries be used so that an entirely new battery system does not need to be created and the focus can be on connectivity and DC-DC converters/chargers etc? Bought a few hundred bosch lawnmower 9s2p battery packs, and have no BMS!

ecki: done own BMS, started PWM DC-DC Controller, using same TI chip as libre.solar, slightly smaller in terms of power.