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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
 If
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 @ $38
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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