Damus
Andrew Zonenberg profile picture
Andrew Zonenberg
@Andrew Zonenberg

Security and open source at the hardware/software interface. Embedded sec @ IOActive. Lead dev of ngscopeclient/libscopehal. GHz probe designer. Open source networking hardware. "So others may live"

Toots searchable on tootfinder.

Relays (1)
  • wss://relay.ditto.pub – read & write

Recent Notes

Andrew Zonenberg · 4h
nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqalqrefce2rehnhhqru9q2jdlvjkw3sd742y8fmnt7e5x9grgdslqetvm0w I'm not expecting your car to speak it, i just want captures eventually
Andrew Zonenberg · 5h
You don't have to normalize either, you can graph raw hex values too https://files.ioc.exchange/iocexchange/media_attachments/files/116/844/375/839/515/680/original/c8b0f096e02a3dac.png
Andrew Zonenberg · 6h
nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqunpekgjvsm7tpu46ene8e9ph469luds23jfvams04zsxupnkmfzqdhgvk2 like the main use I know of for it is semiconductor things where you need a very strong base that's metal-free
Andrew Zonenberg · 7h
nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqlthnr62q9kdv4lxdlp0jkgysexr65jq2gslxrv3zrs9gwdq6z4psxtds6j Right now I have two independent heat pumps that go to outside air, not ground: * Big...
Andrew Zonenberg profile picture
@nprofile1q... The nearer term upgrade planned is to replace our aging resistive hot water heater with a heat pump unit. The water heater needs to be relocated anyway due to other construction in the surrounding area, and it would be stupid to keep a 10+ year old inefficient water heater if I'm going through all of the effort of moving the plumbing anyway.
note1078xd...
Andrew Zonenberg profile picture
@nprofile1q... Right now I have two independent heat pumps that go to outside air, not ground:

* Big Carrier/Bryant one, not sure of size, for the house connected to forced-air ducting to heat and cool the living spaces
* 18K BTU Mitsubishi mini-split for the lab

It rarely gets that cold here in the winter (often not even below 0C) so air heat pumps work decently well. The big efficiency loss comes from rejecting 4 kW of heat from the lab 24/7 to the outside in the winter, then pumping heat from the outside into the house to heat it. If I could pump that waste heat from the lab directly to the house it would save an unspecified but probably decently large amount of energy - right when the solar generation is at a minimum.
1
Andrew Zonenberg · 7h
nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqlthnr62q9kdv4lxdlp0jkgysexr65jq2gslxrv3zrs9gwdq6z4psxtds6j The nearer term upgrade planned is to replace our aging resistive hot water heater with a heat pump unit. The water heater needs to be relocated anyway due to other construction in the ...
Andrew Zonenberg profile picture
June solar update: record high, but not by as much as I had hoped because we had a week of cloudy weather sneak in just before the end of the month.

Final numbers:
* 47% of total energy demand met (was hoping for >50%)
* 2.1 MWh produced (record high), 4.5 consumed, 2.4 net imported (record low)
* 520 kWh exported (record high)

As usual, a few more days for the billing cycle to end before I get the official utility numbers since that's not aligned to the calendar month, but I'm expecting a new record low bill (well under $600 but probably not sub $500 unless I have a really good next few days).

Annual totals are now 23.5 MWh consumed, 6.5 MWh produced, 1.0 exported, 18.9 net imported, with 22% of my total energy demand locally generated.

The solar company's estimate on the quote was 9 MWh of annual production but I expect to beat that by a substantial margin: July should be comparable to June in production so I should be at ~8.6 MWh YTD by the end of July, and the summer won't be over by then. 10+ MWh annual production should be very achievable.

Still looking at ways to cut back on consumption but most of them involve major capex (e.g. energy harvesting heat pump) so might be a while. Figuring out how to make endpoints cleanly suspend/wake when inactive will definitely help although a lot of stuff like e.g. the microscope control system really do not like the host sleeping so this will be tricky.