This system is comprised of 40 -255 watt modules to create a 10kW array. The brewery building is located next to a baseball park which includes a ball net held in place with a number of telephone poles south of the main building. Add to this a cell tower to the Southwest. All of which creates areas of shading at specific times through the solar day.
Because of this shading we opted for micro inverters as their primary advantage is a reduction in losses when portions of the array are shaded. We also mounted a portion of the array on the west facing roof as this is totally free of shading and very visible from the main street intersection. Unlike string inverters with one MPPT channel where all modules need to be of the same orientation and angle, micros give us flexibility and allow any orientation for multiple modules.
A smart TV is mounted in the main room of this local watering hole where it is easy to see just how much power the array is producing. This is a great way to show off your solar system if you have a public area.
The owner and managers of the brewery utilized every possible incentive available here in Montana. Because of their location they were able to secure the USDA 25% grant, a partial grant from NorthWestern Energy, and the low interest loan program (3.25%) from Montana DEQ.
This Photovoltaic system is typical of many we install in Western Montana. Here we have 12 -235 watt solar modules which create a 2,820 watt solar array. The modules are secured with a flush mount aluminum racking structure which is tied into the rafters of the roof. Since this is a metal roof we have specialized neoprene gaskets at each penetration to assure no moisture will penetrate the roof.
A 3,000 watt Fronius grid-tied inverter is the third major component of the system. This unit receives the high voltage DC power from the array and converts it to 240 volt AC power which runs our household electrical loads and Sells any excess power back into the grid. The inverter includes circuit breakers and software which synchronizes with the utility grid and protects utility personal.
One interesting and sometimes overlooked fact is that a system such as this needs to see power from the utility grid to operate. If we have a power outage here, our system will go down even if it is good and sunny. Once the power returns the inverter waits five minutes watching for good steady power before it reenergizes.
If you are interested in having power with or without the utility, check out the battery based inverter systems. We also have a relatively new inverter option which provides a limited amount of power to a specific circuit (1,500 watts) when the grid is down and we have sufficient light to produce power.
SBS Solar is super excited to show you the latest Habitat for Humanity of Ravalli Co home in Stevensville, Montana. This is an all-electric home with new energy star appliances, LED lighting and a very well insulated envelope.
With a $17,000 grant from NorthWestern Energy, SBS Solar was able to install a 30 module, 7.5kWh array with a grid tie inverter and an air source heat pump. We installed this system in December and made the final tie into the grid and installed a net meter on January 2nd.
As of this writing 5 months later, the system has made more power than what the home used thru the building process. We utilized electric, milk house, resistant type heaters to keep our workers warm and set the drywall mud. We eventually installed an air source heat pump in March, after the coldest period of winter.
Now that the family has moved in we will see how well all the systems preform and the actual electric usage. Depending on this power usage, we will see if they are actually netting the big Zero at the end of the year.
It was a lot of fun, and a honor, being part of the design and building of what is possibly the first net zero home in Western Montana.
This Solar PV system in the Bitterroot Valley in Western Montana utilizes two banks of sealed batteries (right side of photo) of 48 volts and 2,400 amp hour rating. Resulting in total capacity of 4,800 amp hours. This equates to 230,400 watt hours of storage.
The left wall holds six solar controllers which regulate the sub-arrays charging, three inverters, associated switch gear. The inverters are battery based yet sell excess energy not used by the farm back to the grid. We included a number of transfer switches to have the option of operating various buildings totally separate from the grid if wanted.
This is the main solar array of the ABC Farm. It is comprised of 60 each, 250 watt modules for a 15,000 watt array. Another 30 modules are located on the processing building to the West. The arrays are wired through six controllers and all feed the central battery bank.
Although our focus here at SBS is Solar Photovoltaic’s, we cannot easily utilize this energy source with our vehicles when we drive long distances, not yet anyway. Enter Biofuels and within this biodiesel. This renewable resource is easy to produce and has many advantages, some of which are listed here.
- The cost per gallon is substantially less than conventional diesel even after depreciating the costs of processing equipment
- Substantially less polluting emissions
- The carbon consumed by a biodiesel fueled vehicle is already in the carbon cycle. Biodiesel avoids adding sequestered carbon to the atmosphere
- Engine life is increased because of the fuels increased lubricity
- Mileage and performance are comparable to slightly less the petroleum based diesel
- Biodiesel compatible vehicles (2006 diesel vehicles and earlier) can run on concentrations from 100% to 0 % and can be switched between fuels with no preparation.
- Home brewing biodiesel is relatively common with much information and equipment available on the internet
- Used vegetable fryer oil is readily available at low to no cost, save for collection labor
- More labor involved
- 2007 and later vehicles can run on concentrations of 20% biodiesel or less
- Gasoline engines cannot operate on biodiesel
- Biodiesel has a higher gel point so winter blends will include a percentage of petro- based diesel.
- Not readily available for consumers
- Users are typically fuel brewers which increases ones responsibility to produce clean fuel
Personal experience with Bio
I started producing biodiesel in 2012. I purchased two used processors and rebuilt them through much research and trial and error. I have successfully operated two Dodge Cummins trucks with 100% to 50% bio. I also drive a VW Passat with the TDI engine to commute to work some 105 round trip miles daily. I did have to change out two vehicles for earlier (pre 2007) built equipment. The only issues I have had are changing the fuel filters more often and one plugged up dodge fuel pump which I replaced.
Concerning oil availability, I have 7 different restaurants I collect oil from and presently have more supply than I use. My cost for used veggie oil is .21 cents per gallon when I average the free oil with those I pay a small fee. This brings my total cost per gallon to .97 cents per gallon which includes all my variable costs excluding my time. The processing equipment will pay for itself in less than two years. Depending on the degree of automation, these units cost me from $1,500 to $6,000.
One of the big advantages for me personally is reducing my demand for imported oil and all the issues this creates around the world. I have implemented numerous technologies in our home and farm to reduce our emissions, conserve resources and save money. Vehicle use has always been a sticking point as we have four vehicles and use them extensively with several businesses we operate. So it is quite enjoyable to pass by the gas stations, even if it does require more labor on my part.
Are Missoulians and the Bitterrooters ready for a Biodiesel co-op?
If this is of interest I would enjoy talking with you. Many communities in Washington and Oregon have active co-ops where members can contribute at differing levels and all benefit from a steady source of bio. Email me at firstname.lastname@example.org
GM, SBS Solar
This six module system was a bit different for the SBS crew. The owners have lived in this beautiful off-grid home perched on a knoll in the timbered Ninemile Valley for some time. For 13 years they have been happy with a solar/battery/generator system as it supplied all of the electrical needs. They had the opportunity to bring in grid power last year and shared the line extension cost with a neighbor.
This summer they suffered a lightning strike making landfall on two Ponderosa pines some 40 feet from the solar array. The surge of electricity blew the bypass diodes on the modules and the controller on the propane generator. Fortunately, it did not affect the batteries, the inverter or charge controller.
Since we now had grid power to the site and we were replacing equipment anyhow, the owners decided they wanted a grid tied, battery based inverter installed. This gives them the best of all power worlds in that they have batteries for emergency power and can also sell back excess power they do not need. Remember, standard off grid battery based systems receive a huge variation of power between summer and winter. In winter our light levels are low to where we can easily use all the power our solar arrays generate. Unlike summer when most off grid systems completely charge the batteries by early in the day and the solar modules are effectively turned off for the balance of the day. Not so when we include a grid connected inverter in the system. With this addition we can keep the modules operating at full generation and send this power back through the electric meter, creating credits for later use.
This in effect, gives us the benefit of annual storage of our solar power, something that solar enthusiasts have dreamed about, especially those who live in the Northwest where we have huge variations of insolation through the year.
We used the most advanced charge controller on the market (the Xantrex XW MPPT 80 600) capable of converting up to 550 volts DC from the array to battery bank voltages allowing us to use large strings of up to 12 modules in series. This was a huge benefit on this system allowing us to achieve less then 2% loss running four strings of 10 gauge wire on a 250′ home run instead of 12 strings of 4 gauge with a standard 150 volt max controller with a dramatic cost difference.
There has been much talk about solar grants in our region this summer. It’s no secret that solar sales were up by near triple in first quarter for most solar installers in the greater Missoula and Western Montana region, as seen in this article in April 2012 in the Missoula Independent. And then the grants suddenly went dry in July of this year. Another article in the Indy shares the details.
Here’s the gist:
- Northwestern Energy gave out $3/watt up to 2000 watts (or 2kw) for grid-tied Solar PV installs in their territory. This amounted to the $6000 grant folks would commonly ask for.
- After the 2010 election, some state legislatures threatened to cut the state tax credits of $500/tax payer, $1000/couple, but it stood true. And the 30% Federal tax credit remained strong.
- In 2011, hard costs dropped nearly 40% for Solar PV, taking that $6k grant on a 2kW from a 30% coverage on an $18.5K system to a 50-60% coverage of install total on that same 2kW system, now costing under $11K.
- By early 2012, solar energy was hitting an all time high in popularity on a national and global scale – everything from solar in China and India to solar on the White House, to solar farms in the southwest and solar financing companies popping up.
At this point at SBS Solar, like most local installers, we were selling our grants faster than we could get them. At the same time, Northwestern Energy was having more requests than ever for solar grants, especially in the Missoula area, and they were maxing out their grant fund. This, coupled with the drastic drop in pricing, brought things to a (temporary?) standstill in early summer of this year.
What we do know is that Northwestern Energy asked the MREA for a recommendation on how to proceed. We at SBS Solar, and many of our fellow installers, weighed in with similar sentiments. Cut the grants per watt in half to $1.50, but keep the maximum grant at $6000. This would mean that a 2kW system now gets a $3000 grants ,and someone could get a $6000 grant for a 4kW system. This would be awesome! A triple-bottom-line here: Customers get a great grant and are now incented to go with a larger system instead of stopping at 2kW, Installers are now selling larger systems (and perhaps more often) and Northwestern Energy is getting double the renewable energy put back into their grind for half the cost, thereby getting them to their renewable energy mandate faster.
So…. here we with no grants, a state tax credit and a federal tax credit that could be in jeopardy depending on the outcome of the November election, and little action in the market.
Enter the SBS Solar Private Solar Rebate. We are offering a rebate for solar customers that is competitive with the aforementioned MREA recommendation to Northwestern Energy. Roughly $1.50/watt. We also have two different solar financing options, one state sponsored and one private.
If you’re interested in solar today, don’t wait for an answer until November (at the earliest), when you can get our rebate today: www.sbslink.com. 406-541-8410. Ask for Dan.