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Morningstar SG-4 SunGuard Solar Controller.
Morningstar’s SunGuard™ is the world’s leading single module controller. We have combined all the advantages of our SunSaver charging circuit with less expensive packaging to provide an economical controller for small PV systems.
Key Features and Benefits
Series design (not shunt)
100% solid state
True 0 to 100% PWM duty cycle
Setpoint accuracy to 60 mV
Temperature compensation
Rated for 25% overloads
No need to derate
Lightning protected with 1500 W transorbs
Self-consumption is 6 mA
Fully encapsulated in epoxy potting
ABS plastic, impact-resistant case
Outdoor rated, Hypalon connecting wires
5 Year Warranty
Specifications
Rated Solar Current: 4.5A
Rated Loan Current*: None
System Voltage: 12V
* There is no load connection on the SunGuard
Other brands survive harsh conditions.  Morningstar
thrives
in them.
With more than 25 years of experience and well over four million products in over 100 countries – most of them still in operation – Morningstar has truly earned its reputation for building the “world’s leading solar controllers.” At Morningstar, the word “reliability” means a lot more than a marketing adjective.  Morningstar’s employee-owned culture works hard to maintain the lowest hardware failure rate in the industry, because our own reputations literally ship with every product.
That’s why system designers of the most mission-critical solar energy installations around the world insist on Morningstar components, and why you should too on your next  project. From mineral mines in South America to telecom repeater stations in Canada, from gas wells in the Middle East to mountain peaks in Nepal, Morningstar technology and legendary quality make the difference between success and failure – and make renewable energy a practical, cost-effective, and long-term solution.
Attachments
Morningstar SunGuard Datasheet
Morningstar SunGuard Operator”s Manual
Morningstar SunGuard Bench Testing Instructions
Morningstar SunGuard Field Testing Instructions
Morningstar SunGuard Quick Test Checklist
Morningstar Charging Isolated Battery Banks with one Controller
Morningstar Charging Isolated Battery Banks with one PV Array
Morningstar DIAGRAM: Charging with Parallel Controllers
Morningstar DIAGRAM: Correct Inverter Wiring
Morningstar DIAGRAM: Parallel Battery String Wiring
Morningstar Declaration of Conformity for Products Under 48V
Morningstar RoHS Certification Document
Morningstar PWM vs. TrakStar MPPT Technology
Morningstar Why PWM?
Morningstar SunGuard Electrical Diagram
Morningstar SunGuard Mechanical Diagram
Morningstar Product Accessory Compatibility Matrix
Morningstar’s SunGuard controller is a one module solar controller for professional and leisure markets.
Exchanges or Returns
Please contact us before returning or exchanging an item to receive a return authorization (RA). Items returned to us without receiving a return authorization will be returned to you at your expense. We accept exchanges and returns for unopened items or damaged/defective products within 30 days of receipt of shipment. A 20% restocking fee may apply to multiple quantity returns or large ticket items. A 20% restocking fee
will
apply for all products that ship freight. Exchanges and returns are not accepted after 30 days of receipt of shipment.
Unopened Products
To make an exchange or return for an unopened product, please contact us and obtain a Return Authorization. If the exchanged or returned product is unopened with all original accessories, manuals, packaging, and/or shrink wrap, you will be responsible for return shipping. If the product was sold with free shipping, shipping charges to deliver the item will be deducted from the refund amount. A refund to your method of payment will be processed within one week of receiving an authorized return minus any applicable shipping charges.
Damaged/Defective Products
To make an exchange or return for a damaged/defective product, please contact us and obtain a Return Authorization. If the product is returned for being damaged/defective, we will provide a return shipping label for domestic shipping costs. If we test and confirm the product is damaged/defective and receive the product along with all original accessories, manuals, and packing, we will provide a refund for the purchase price of the product, plus domestic shipping charges, if any, assessed at the time of purchase. International shipping charges, if any, will not be reimbursed. A refund to your method of payment will be processed within one week of receiving an authorized return. If we test and confirm the product is in full working order, a refund will not be provided and you will be responsible for providing a return shipping label to have the product returned to you.