Oasis Montana Inc.
Grid-Tie Renewable Energy Systems
Tech. Support: 1 406 777-4321
Home Page: www.oasismontana.com


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

If you would like
to add a small photovoltaic system to your home or business to help keep a lid on your utility bill -- or to just do 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 (This system will provide ~3.5 kilowatts for five hours of full sun.):

Sunny Boy 700U inverter
Fan kit
8 - Sharp 123W solar modules @ $675 ea.
2 - 4X A-frame roof/ground mounts w/adjustable legs
Square D AC and DC disconnect
SOV lightning arrestor
6 - 33” #10/2 module interconnects @ $18 each.
2 - Wire kits @ $50 each

Total System*

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

$    89
$  738
$  175
$    42
$  108
$  100


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 us for more information.


Oasis Montana Inc.
Grid-tie solar electric power systems for the home
436 Red Fox Lane, Stevensville, MT 59870

E-mail us for free information on system sizing; or order our Design Guide & Product Catalog for $10.00  ($18.00 for international customers)

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mailto: info@oasismontana.com
Home Page www.oasismontana.co

(C) Copyright 2008 - 2017 Oasis Montana Inc - All rights
Revised 11/03/18

Toll Free order line:
Tech. Support: 1(406)777-4321
Fax: 406-777-4309