Oasis Montana Inc.
Renewable Energy Supply and Design
406-777-4321or 4309
e-mail: info@oasismontana.com
Home Page: www.oasismontana.com

Visit us on the web for product and project information!
For grid-tied power systems, www.grid-tie.com
Solar water pumping:  www.PVsolarpumps.com
Non-electric gas appliances, www.LPappliances.com
Efficient and DC appliances, www.eco-fridge.com
And our main page at www.oasismontana.com


Oasis Montana renewable energy newsletter for spring 2008

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Page 4
Small Batteryless Grid Tie System with the Sunny Boy 700U Inverter

If you are wanting to add a small photovoltaic system to your home or business to help keep a lid on your utility bill -- or to just doing something to become ‘greener’, this may be the system for you!  It features a 700W grid-tie inverter, and it’s the smallest unit available for a utility-tied system
that will work without batteries. Here’s how the system breaks down.

Sunny Boy 700U Inverter                            $1459
Fan Kit                                                            $89
8 - Sharp 123W Solar Modules @ $675 ea. $5400
2 - 4X A-frame Roof/Ground mounts
w/Adjustable legs                                           $738
Square D AC and DC Disconnect                  $175
SOV Lightning Arrestor                                   $42
6 - 33” #10/2 Module Interconnects @ $18 each. $108
2 - Wire Kits @ $50 each                             $100
Total System                                             $8111

Not included are freight, installation, concrete (if ground mounted), wire nuts, roofing material/caulk, or site specific items necessary for the installation.

This system will provide ~3.5 kilowatts for five hours of full sun.

In this system, we specified eight of the Sharp 123W modules since that still keeps us under the 1000W max limit of the inverter’s 1KW rating, and the maximum power point window of the SB700U 200 inverter (100 to 200V) is a good match for eight Sharp 123’s (8 x 17.2V = 137.6V). In the worst case scenario, the maximum open circuit voltage output of the Sharp 123s (8 x 21.3V x 1.25 = 213V) won’t exceed the inverter’s maximum DC input voltage (which is 250V). When all is said and done, typically you get about ~75% of the nameplate wattage of a grid-tie system when the array is in full sun. There are several factors taken into account for typical system losses: dust, clouds, module power mismatch, temperature, wire loss, inverter inefficiency, etc. Under certain conditions (cold temperatures with bright sun), your solar array may make up to 25% more power than its nameplate rating--which helps counteract the system losses. The inverter may even limit (or ‘clip’) the power a little bit at such times.

The Sunny Boy 700U is the smallest, batteryless inverter available to us at this time. If you are looking for more output or a battery-based system for powering important loads in an emergency situation, call us and we will design a system to suit your project, or e-mail mark@oasismontana.com for more information.

Gary Reysa of Bozeman, MT, has a plan to cut household energy use in half. Why cut down personal energy consumption? There are lots of reasons, but some include putting a dent in greenhouse gases, creating less pollution, and saving money while doing the right thing. Mr. Reysa is a retired Boeing aeronautical engineer, and you can view suggestions about solar home heating, efficient lighting, phantom loads and other energy-saving projects at www.BuildItSolar.com.

Solar powered stock watering systems

lorentz submersible solar pumpsIf you have a water pumping need for your cattle, horses or other stock, give us a call with your project specifics and we’ll be happy to propose a system for your site. We offer different pumps for differing situations, but of late we have been selling a lot of the Lorentz line. All of the Lorentz submersible pumps and controllers are covered by a 2-year manufacturer’s warranty against defects in material and workmanship except the PS150 Boost pumps which have a 1 year warranty. Look over these Lorentz sample submersible pumping systems below and let us know if any of them will meet your needs. If not, we will design a system just for you.

Lorentz PS150 submersible centrifugal (shallow well, high volume)
1 Evergreen Spruce ES-190-RL 18V 190W solar module @ $990
1 single module top-of-pole mount structure @ $160 (2” ID SCH40 steel pipe required)
1 15’ array-to-controller wiring kit @ $38
1 Lorentz PS150 pump controller @ $275
1 Lorentz CSJ5-8 submersible centrifugal pump @ $895
1 Lorentz low water sensor @ $65
1 float switch @ $39

Equipment total = $2,462
On average this system will produce ~2,100 gpd when pushing against 50’ of head with 5 hours of full sun per day.

Lorentz PS1200 submersible helical rotor (deep well, low volume)
4 Evergreen Spruce ES-190-RL 18V 190W solar modules @ $990 each = $3,960
1 four module top-of-pole mount structure @ $663 (4” ID SCH40 steel pipe required)
1 15’ array-to-controller wiring kit @ $38Lorentz deep well solar pumps
1 Lorentz PV disconnect & junction box @ $148
1 Lorentz PS1200 pump controller @ $695
1 Lorentz HR-03H-2 submersible helical rotor pump @ $1,230
1 Lorentz low water sensor @ $65
1 float switch @ $39

Equipment total = $6,838
On average this system will produce ~600 gpd when pushing against 760’ of head with 5 hours of full sun per day.

The PS600 & PS1200 systems can also be powered by a 120/240 VAC generator or utility power during cloudy periods by using the Lorentz AC power pack @ $499. Note: these system costs do not include freight, installation, steel pipe, rebar, conduit, splice kits, wire nuts, or other site specific items necessary for installation.

Below is a chart with more Lorentz pumping systems; all systems are based on 5 hrs. of full sun, and come with wiring diagrams.

Lorentz system description Head (feet) Volume (gpd) Price
PS150 Boost-125 surface mounted rotary vane 132’ 590 $1,711
PS600 BADU Top12 surface mounted centrifugal 20’ 10,600 $6,328
PS200 submersible helical rotor 130’ 1,100 $3,616
PS600 submersible helical rotor 400’ 640 $5,355

Page 4

Oasis Montana renewable energy newsletter for spring 2008

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Now in autumn, we are enjoying cool and wet (even snowy) conditions, but it was one hot and smoky summer and fall for many parts of the western U.S., and Montana was no exception. We were smug with our good snowpack, back in spring. Then our summer started with a week of 100+ degree weather, and continued to stay hot. We were blanketed in smoke from the horrific fires (1.3 million acres burned) until the middle of September, and unfortunately, many homes and a few lives have been lost. We have been able to help some people with water pumping to protect their properties, but our drought conditions and warm temps made for a very dry western tinderbox. If only those folks in Texas could’ve share perhaps 1/20th of their deluge from their state…

Even so, the garden and fruit trees kept us busy, and despite the smoke we still enjoyed camping, fishing, and canoeing in our local river (even though the water was quite low). We hope our legislators will work on commonsense future measures to mitigate the effects of warming temperatures and prolonged drought. One thought we have had (since we were less than a mile from our local small airport, a helibase that launched many helicopters and other aircraft for fighting fires) is that actual planning for these events would be a good idea (seeing as they are now part of our new normal)—how about reservoirs near these airports to make hauling the big buckets faster and more affordable? Here in Stevensville, we have several large irrigation ditches in close proximity to our airfield…. Well, it’s just my 2 cents worth!

PICOCELL controller inverter for array-direct water pumping for your 240VAC AC pump
In this issue we have some new products to share; one is an exciting new AC pump controller/inverter that can run your 240VAC (or 120V, or 3 phase, or 230VAC 50 hz) 1/3 to 2 horsepower pump directly off of a solar array – click here for more information on the PICOCELL controller/inverter (cost: $1220 plus shipping). This exciting new technology is designed for off-grid use, or emergency back-up. We have installation manuals, spec sheets, and pump kit information on our water pumping site.  Call or e-mail for more information.

New, small Energy Star rated AC refrigerator
We also have a new, small AC refrigerator, 7.1 cu.ft. for your home or cabin, the CP972SS. It’s a great size for space-limited kitchens, only 22”W x 22”D x 57”H and will sell at the great price of $459 plus shipping. With its lean size, the CP972SS is the ideal refrigerator for studio apartments, yachts, offices, and other settings in need of reliable cooling in a slim-fitting footprint. Visit here for more information on this and other (larger) refrigerators.

The best nuclear generating station is 93 million miles away, and is available for pretty much everyone!
Thomas Edison quote on Solar Energy

Iron Edison Batteries
We also have a new line of batteries to offer, manufactured by Iron Edison;
visit our information on this exciting new product line.


The International Trade Commission (ITC) is responding to a lawsuit brought about by SolarWorld and Suniva (U.S. module manufacturers) that low cost imported (i.e. Chinese) solar modules have hurt their competitiveness, so they are asking for a tariff on imported solar panels to ‘level the playing field’. Many pro-solar groups are opposing these tariffs, as they will increase the dollar-per-watt cost of installed solar power systems, and very negatively impact job growth in the solar sector – which had been bourgeoning in the past few years. In fact, it is estimated that 1 out of 50 new jobs is in the renewable energy sector. The ITC has approved tariffs, but it will be up the President Trump to set the rate; those of us in the industry are waiting to see what will happen, and many jobs are on hold pending the decision. It sounds like costs may go up 10% to as much as 40%. For more information visit:  https://pv-magazine-usa.com/2017/10/31/breaking-usitc-recommends-quotas-tariffs-on-crystalline-silicon-solar-imports/  

Renewable Energy (and related) news bites

             1912 Warning on coal cuasing climate change



  • When autumn darkness falls, what we will remember are the small acts of kindness: a cake, a hug, an invitation to talk, and every single rose. These are all expressions of a nation coming together and caring about its people.
    --Jens Stoltenberg
  • Designers want me to dress like Spring, in billowing things. I don't feel like Spring. I feel like a warm red Autumn.
    --Marilyn Monroe
  • The cost of solar energy has not been opened up because the oil industry does not own the sun.
    –Ralph Nader
  • The spring, summer, is quite a hectic time for people in their lives, but then it comes to autumn, and to winter, and you can't but help think back to the year that was, and then hopefully looking forward to the year that is approaching.
  • A kestrel can and does hover in the dead calm of summer days, when there is not the faintest breath of wind. He will, and does, hover in the still, soft atmosphere of early autumn, when the gossamer falls in showers, coming straight down as if it were raining silk.
    --Richard Jefferies
  • I love nuclear energy! It's just that I prefer fusion to fission. And it just so happens that there's an enormous fusion reactor safely banked a few million miles from us. It delivers more than we could ever use in just about 8 minutes. And it's wireless!
  • I prefer winter and fall, when you feel the bone structure of the landscape - the loneliness of it, the dead feeling of winter. Something waits beneath it, the whole story doesn't show.
    -- Andrew Wyeth
  • There has been a systematic repression of solar energy. It seems pretty funny to me that the government, if it is completely neutral--why wouldn't they pursue this far safer alternative of solar energy with the same intent that they pursue nuclear energy? Solar power is the last energy resource that isn't owned yet--nobody taxes the sun yet.
    --Bonnie Raitt
  • The problem with winter sports is that--follow me closely here--they generally take place in winter.
    --Dave Barry
  • If we had no winter, the spring would not be so pleasant: if we did not sometimes taste of adversity, prosperity would not be so welcome.
    --Anne Bradstreet