• Guaranteed Fitment

    Always the correct part or we'll get you the right one at our cost

  • In-House Experts

    We know our products

  • Installation

    Available in most regions

  • Nationwide Delivery

    Same day local, no rural surcharge.


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  • AC Output Terminals – Wiring location for AC output
  • Remote Meter Jack – Communication port for Morningstar Remote Meter or PC Communications**.
  • DIP Switches – Four switches to adjust operating parameters
  • Remote On/Off Contacts – Connection points for remote On/Off switch or jumper wire
  • AC Output LED – Displays operating status of AC output
  • Inverter Status LED – Displays operating status of the SureSine
  • 12V Battery Input Terminals – Wiring location for 12V lead-acid battery input
  • Earth Ground – Wiring location for earth grounding or chassis grounding

• Marine
• Home & Office
• Power tools
• Portable equipment
• Solar power systems
• Camping
• Automotive

Technical Specifications

  • SI-300-220V
  • Electrical
  • AC Output Voltage (RMS) 220V +/- 10
  • Nominal Power Rating 300 Watts @ 25°C
  • Peak Power Rating 600 Watts @ 25°C (15 min)
  • DC Input Voltage 10.0V – 15.5V
  • Self Consumption (AC Output OFF) 25 mA
  • Self Consumption (AC Output ON) 450 mA
  • AC Output Frequency 50 Hz +/- 0.1%
  • Peak Efficiency 91%
  • Total Harmonic Distortion (THD) < 4 %
  • Waveform Pure sine wave
  • Environmental
  • Operating Temperature Range -40°C to +45°C
  • Storage Temperature -40°C to +85°C
  • Humidity 100% Non-condensing
  • Enclosure Type 1 (Indoor Only)
  • Setpoints
  • Low Voltage Disconnect Adjustable: 11.5 V or 10.5 V
  • Low Voltage Reconnect Adjustable: 12.6 V or 11.6 V
  • LVD Warning Threshold (buzzer) Adjustable: 11.8 V or 10.8V
  • LVD Delay Period 4 minutes
  • Instant LVD 10 V
  • High Voltage Disconnect 15.5 V
  • High Voltage Reconnect 14.5 V
  • Standby On Threshold ~ 8 Watts
  • Standby Off Threshold ~ 8 Watts
  • High Temperature Disconnect 95°C (heatsink)
  • High Temperature Reconnect 80°C (heatsink)
  • Data Communications
  • RJ-11 Connection Morningstar Meterbus / Modbus 16-bit RTU **
  • Mechanical
  • Dimensions 213 x 152 x 105 mm
  • Weight 4.5 Kg
  • Enclosure Rating IP20
  • AC Terminals:
  • Wire Size up to 4 mm2 / up to 12 AWG
  • DC Terminals:
  • Wire Size 2.5 to 35 mm2 / 14 to 2 AWG
  • Remote On/Off Terminals:
  • Wire Size 0.25 to 1.0 mm2 / 24 to 16 AWG
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We do our best to get shipping rates right, but sometimes the system gets it wrong.

If we charge an excessive, or insufficient amount steps may be taken to refund, or bill an additional amount at our absolute discretion.

Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

There are certain situations where only partial refunds are granted (if applicable)
- Any item not in its original condition, is damaged or missing parts for reasons not due to our error
- Any item that is returned more than 30 days after delivery

REFUNDS (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at charlie@autobatteries.co.nz.

Exchanges (if applicable)
If the mistake is our's we'll get it sorted ASAP at no expense to the customer, If the mistake is yours and you need to exchange it for a different item, send us an email at charlie@autobatteries.co.nz and send your item to: 1/4 Spencerville Road, C/- Canterbury Catering Equipment, CAN, Christchurch 8082, New Zealand.

Flick an email to charlie@autobatteries.co.nz and we'll work out the best way to get things sorted.

To keep prices as low as possible we operate online without a physical location. Pickups are possible in Christchurch, and a site visit is no problem.

Locally our team conducts battery installations, around the country we will find a local agent who can help. For solar installations we have approved agents that we recommend.

Two scenario's here, if we've made a mistake, it gets sorted ASAP at zero cost to the customer, if the customer has made the mistake it's handled on a case by case basis.

Yes, we do, various contractual (or time based) reason's that not all batteries are listed, Hit the live chat button on the right, or send an email to charlie@autobatteries.co.nz, or call Charlie on 0273005838 and we will give you our quote.

Nope, we stick to the big stuff.

If you're between Ashburton and Rangiora, and you order early enough, absolutely.

On the same stocked item, we do our best, but we've got bills to pay, and it's bloody hard to compete with the buying power of the big boys, this is handled on a case by case basis. Hit the live chat button on the right, Fire us an email charlie@autobatteries.co.nz or give Charlie a call on 0273005838 and we'll see what we can do.

Hit the live chat button on the right, Fire us an email charlie@autobatteries.co.nz or give Charlie a call on 0273005838 and we'll see what we can do.

Fire us an email charlie@autobatteries.co.nz or give Charlie a call on 0273005838 and we'll see what we can do.

All of our products are covered by manufacturer warranties

Trojan Batteries
Replace/Repair period up to 3 Years
Pro-rated Credit period up to 10 Years

Neuton Power Batteries
Up to 3 Years

Vision Batteries
Up to 5 Years

Up to 3 Years

Up to 5 Years

Trina Solar
Up to 30 Years

Customer Reviews

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