Solar Power - Installation Day 4

All the panels are on the roof, the trench has been re-filled, the wiring is done, it was tested and span the meter backwards. Next step is inspections that can take a few weeks before we can turn it on for real....

I installed the Solarcity Internet monitoring system base station by plugging it into a spare Ethernet port on my DSL modem. It flashed some lights that told me that it had connected to Solarcity successfully, then started scanning to find the monitored devices. It talks to the inverter to track how much power is being generated, and I will have an optional consumption monitor that tells me how much power the house is using. I have to wait for the install to be complete before I can see any output on the solarcity.com web site.
Also, they were out of stock of the consumption monitor, so it will need to be added on later, but it doesn't affect the operation of the system.

I have also figured out the Ground Source Heat Pump, I'm going for a vertical well based installation, its a 3-ton A/C unit and heater made by Carrier that hooks up to my existing propane furnace ducting, and includes a water heater that replaces my propane hot water tank. It exchanges heat with the ground using three 200ft deep wells, and for every KW of electricity it uses, it pumps around 4KW of heat in or out of the house. This is over twice as efficient as a conventional air based A/C unit. It costs more, but there is a 30% federal tax credit on the full price, just like the solar power installation, thanks to Obama's stimulus package (this credit started in February 2009). I'm hoping to have enough solar power to zero out the running costs, we will see how that goes over time.

Classic car events in August

I go to the Monterey Historic Races every year, and this year I'm also taking my Citroen SM to a new event La Dolce Vita Automobili - it's set up to be a smaller and more fun alternative to the Concorso Italiano, which is on the same day Friday August 14th.

Here is the SM at Crater Lake a few weeks ago.

Solar Power - Installation Day 3

Today about half the panels were put in place on the roof, and a lot of wiring was put in place.

Here are the installers starting to put panels in place in the morning.


In the evening the lowest row of 20 are in place, and about half of the next row. There will be a total of 60 panels when it's done.



Here is the underside of a panel, in a shipping rack on the truck.


A closeup of the panel's specification label, as I mentioned before, its a Cadmium Telluride CdTe thin film technology panel from First Solar. Each panel is rated at 75W, and the total installation is rated at 4.5KW.

Solar Power - Installation Day 2

More mounting hardware is now on the roof, the brackets that hold the panels to the rails are now in place. Since the PG&E meter isn't mounted on the house itself, they also had to dig a trench. Tomorrow a county planning dept. inspector will come by to make sure everything is to code.

I also got an email from PG&E today, informing me that they know I have solar being installed and will schedule an appointment to do their own verification and turn the system on, once the hardware is in place.

One subtlety, since I also want to connect a generator for when we get power cuts (I'm on top of the Santa Cruz mountains) we had to decide what order to wire everything together. The sequence is

PG&E service meter - Solar Power system - Generator - House breaker panel

The generator is only wired into a subset of the house circuits, so it is looped into the house breaker panel. When installed, it will have a sensor that can tell whether there is any incoming power from PG&E, and if not, it fires up after 20 seconds or so.

The solar power system detects the PG&E power, synchronizes to the 60Hz phase and adds its own power by providing a few volts more than PG&E, to get the power to flow into the system. If PG&E goes away, the solar system also shuts down, then the generator detects no power, isolates the downstream components and takes over powering the house.

At one point I looked at having batteries rather than a generator, but it is a lot less efficient, they don't last very long and they are far more expensive. A 6KW battery system with inverter was around $10K, while I can get a 8KW propane generator for $2K, and I'm thinking of putting in a 14KW Generac 5503 that is currently available from Amazon for $3.3K delivered, since that can supply a 40A 220V circuit for the heat pump. I'm likely to need it for up to a week each year, and that will be the only thing that uses propane at that point.

Solar Power - Installation Day 1

Here's the house, showing the mounting points and rails on the roof.



Top end of conduit at the roof line.



Bottom end of conduit at the basement level.



Bottom end and A/C shutoff switch on the front of the house at basement/ground level.



A/C shutoff switch. Safety rules mandate that this is easily accessible on the outside of the house.



Inside the basement, showing the connection to the back of the A/C cutoff switch on the right. In the middle is the D/C cutoff switch that has the conduit from the roof routed to it. There will be another D/C shutoff switch on the roof itself, again for safety.



This is the inverter on the left, and the D/C shutoff switch on the right. The pipe coming up carries the phone line into the house.

Solar Power - Installation Scheduled

The plans were approved earlier this week, and Solarcity called me on the phone and emailed to setup an installation time, which I was able to arrange very conveniently via email. The assigned installation team are finishing up another job, then I'm next, starting tomorrow (Friday 24th July) for a few days.

There has been nothing to show so far, but I will be taking pictures and posting them.

Looking at the options for electric water heating led us to consider a ground source heat pump (GSHP), plans are still in flux, but I'm looking at adding a heat pump that will heat hot water as well as heat and cool the house. The ground source part is that it doesn't have a conventional air fan based heat exchanger, it runs water through underground pipes. This is relatively expensive, but there are rebates, and it is very efficient. More later...

Velocity conference summary

Steve Souders writes a good summary of the Velocity Conference. I'd like to present something next year, I have a few ideas already, and have been inspired to try some latency testing projects at work.

Solar Power - plan submitted

solarcity.com emailed me a very detailed pdf of the plan for 4.5KW on my roof, and submitted it to the County for planning approval today. Meanwhile the house is being re-wired this week for 220V and a 200Amp feed to replace the 110V/100A setup. Also putting in 220V outlets for the kitchen range, hot tub, dryer and hot water heater. Propane tank is now disconnected and I have to go shopping for new appliances...

Playing with Hadoop in the Cloud

I just finished writing a paper for CMG that is a tutorial on Amazon Elastic Map Reduce. I signed up, it was easy, and after I ran two of their demo jobs I owed them 26 cents. Very cool...

Solar Power - first step

There is a rebate for solar power systems, and the first step is that the power company (PG&E) reserves a rebate and notifies me and SolarCity that if we install a system by a deadline we will get a certain amount of rebate. I have also got an appointment on Monday for the SolarCity engineer to come and spend a whole day taking measurements and designing the system installation.

Last week we got the shingles replaced, since the old ones were getting near the end of their life, and its a good idea to put the solar panels over a roof that will last for a long time, so they won't need to be removed to fix anything.

I will be at Usenix 09 - San Diego - June 15-17

I'm attending a tutorial on care and feeding of Hadoop on Monday, teaching my own tutorial on tuning and tools tuesday, and staying for the first day of papers on wednesday. See you there...

New music: MirthKon's Vehicle

Some of the most inventive new music is coming from "unknown" bands in the greater San Francisco region. Through my connections with Fractal I have been a fan of Headshear for many years and now MirthKon have released their first full CD, "Vehicle". Fractal and Headshear have played many gigs together, and MirthKon founder Wally Scharold played in Headshear for a while a few years ago.

I have seen MirthKon play a few times, and they are currently on a west coast tour, having recently played SF and Berkeley, they are in Hollywood on June 5th and San Diego on June 6th, then Chico on June 18th, and Eugene and Portland on June 19th and 20th. They have a conceptual video extravaganza to enhance the musical experience at live shows.

So, what do they sound like? Well, lets start by saying that if you like Frank Zappa, and wished he was still putting out new music, then you will be very happy to take this Vehicle for a ride to Joe's Garage. Its impossible to really say what Zappa sounds like, since the mix of styles and influences is so diverse, but MirthKon have some of the same elements, along with their own unique character. There is a strong dose of humor, very complex rhythms and time signatures, some jazzy vocals on a few tracks, but a largely instrumental mix that combines clarinet and saxophone with guitar, bass and drums

They dub it "The first full-length CD from the Bay Area's most hyphenated thrash-jazz-prog-chamber-core ensemble", which probably doesn't help much. I have been happily playing it over and over again in my car for the last week, expand your musical horizons and support local music by getting your own copy....

miRthkon is:
Wally Scharold - guitars, vocals, composition, sound design, conceptual design, text, video, producer
Rob Pumpelly - guitars, composition
Nat Hawkes - bass guitar, vocals
Carolyn Walter - piccolo, flute, clarinet, bass clarinet, alto saxophone, tenor saxophone
Jamison Smeltz - alto saxophone, baritone saxophone, vocals
Matt Guggemos - drums and percussion
Jarred McAdams - video, text, conceptual collaborator

Solar Power order placed

I signed up with http://www.solarcity.com for 4.5Kw of thin film panels (60 of them). Their web site is slick, walks you through the install process, they have online monitoring of the output of the solar array and I also added the option of monitoring the house's consumption of electricity, which is integrated into the same web based monitoring and graphing package. They visit later this week to do the engineering assessment, then I get plans (provided online) and planning approval etc. follows. Should be all done in 2-3 months.

Thin film is better in partial light, and high temperatures, and it can be mounted closer to the roof tiles since it doesn't need an air gap underneath to cool it. We have a hot microclimate with no shade, at 2400ft altitude, above the morning mist most of the time, so the longer power delivery period per day should compensate for the slight reduction in peak efficiency compared to silicon. Solarcity offered both at the same price. There is a combination of a rebate and a tax credit at the moment. The tax credit is about 30% of the cost, and was added recently by Obama's stimulus package.

As it progresses I will post pictures and updates.

FLOW - a homebrew Android gumstix phone (finally)

See more here.

A few years ago the Silicon Valley Homebrew Mobile Phone Club (SVHMPC) formed out of frustration with the closed market for phones, and set out to build something we could program in our pocket. We made some progress but the prototype Gumstix Goliath board never made it into production, and along came the iPhone, which gave some of us the application platform we were looking for to customize. The OpenMoko project is also limping along, and Google Android is finally out there in volume. The FLOW project is open hardware running Android with a Gumstix CPU module. Nice combination for making custom devices.

Memcached 500K ops/s on Niagara T2

This is some nice work, scalability analysis to fix lock contention in memcached, then running on an out of the box Solaris T2 gets 500K ops/s or 9.6Gbits/s depending on payload size. The Niagara 2 based T2 has built-in 10Gbit network, and 8 cores with 8 threads in one chip. Sub-millisecond response.

http://blogs.sun.com/zoran/entry/scaling_memcached_500_000_ops

Netflix App Gallery

The Netflix API now has an App Gallery http://www.netflix.com/AppGallery which features my Instant Queue Add for Netflix iPhone app.

Usenix 09 - San Diego in June

I'm presenting again next month, at Usenix 09 in San Diego. I'm giving an all day workshop/tutorial on Tuesday June 16th. I have just updated my slides, combining the talks I have been developing over the years into Solaris/Linux Performance Tools and Tuning, which includes the Capacity Planning with Free Tools material that Mario Jauvin and I developed for CMG.



I have also posted the slides to http://www.slideshare.net/adrianco
.

Please come along, I look forward to seeing you in San Diego.

Cheers Adrian

What I did for earth day...

Update: the electric mower works well, cuts better than my old gas mower, and the drive option works very well. Since the batteries make it heavier than a gas mower, the power drive makes a big difference. Hacking through very long grass, the batteries last about half an hour, keeping previously cut grass trimmed short I think it would last a lot longer. Its enough for me]

Actually, what really happened was that I tried to mow the grass last weekend and decided that my old gas lawnmower wasn't up to the job, so I did some research and bought an electric one. Its quiet, doesn't need gas, the throttle and air intake don't need cleaning out and just starts when I want it to.

I ordered it from Amazon.com on Sunday evening, as usual, with the free 5-7 day shipping option, and it arrived on Tuesday. I guess Amazon had nothing better to do than ship stuff... but it was nice to save $67 for shipping a 100 lb package and still get it very fast.

I got the latest biggest electric I could find, the Epic EP21H 24Volt cordless self propelled 21 inch. The rear wheels are belt driven from the main motor via a gearbox. It has a high efficiency brushless motor that drives the blade directly and two 12V lead acid batteries and should run for 40-50 minutes per charge. This is plenty of time for me to get fed up with mowing and charge it overnight. Its a bit bigger and more rugged than my old 4HP 20inch gas mower, and has a side discharge option so won't get clogged trying to mulch tall grass. I'll try it out after work.

I've also been looking forward to getting solar power installed on my roof, and I'm finalizing plans to make a commitment to get it done this year. I will blog my way through the process as it happens...

Fractal iPhone app source code

I have posted the source to Fractal's iPhone app to google code. I'm hoping that other bands can replace the artwork and URLs and quickly get their own promotional apps out there. If we end up with bug-fixes and improvements, then everyone gains....

iPhone apps that don't work on 3.0beta2

Both dictionary.com and PocketFlix fail immediately after they launch with iPhone os 3.0beta2

Most other apps seem to be working, and beta2 is faster and more stable.

[Posted with iBlogger]