Oasis Montana Inc.
Renewable Energy Supply and Design
406-777-4321or 4309
(877-627-4768 toll-free order line)
Tech. Support: 1 (406) 777-4321 or 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
 

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Oasis Montana renewable energy newsletter for spring 2008

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