top of page

Article Number: 61121240 Supreme Combi 12 V / 1200 W - 40 A

The Supreme Combi 12 V / 1200 W – 40 A will offer you reliable service by providing AC power and 5 V USB power for your home, cabin, boat, RV or Trailer using battery power and recharge your battery automatically when utility AC is available. The Sinewave Inverter-Charger can run many AC-powered appliances when you need AC power anywhere. The 5 V USB power can charge many USB-powered devices. The multi-stage battery charger will charge different types of batteries.


  • Detachable remote on/off display can be mounted anywhere
  • Runs small microwave ovens, computers, televisions, powertools and more
  • Multistage charger ensures batteries are recharged safety and efficiently
  • Sinewave output ideal for running demanding motorloads, sensitive electronics and battery rechargeble devices
  • Convert 12 V battery power to AC power
  • Ideal for boats, trucks and caravans


Dimensions230 x 478 x 114 mm
Weight5.7 kg
Output Power (Continuous)1200 W
Output Power (Peak)2000 W
Output (Voltage, Frequency)230 VAC - 50 Hz
Output Current5.2 A
Output WaveformTrue Sine Wave (<3% THD)
Peak efficiency90%
No-load battery draw<1.5 A
5 V USB750 mA
DC Input Voltage (nominal)12.5 VDC
DC Input Operation Range10.5 - 15.5 VDC
DC Input Current~90 A
Input Undervoltage Warning / Shutdown11.3 / 10.5 V & 12.1 / 11.8 V
Input Undervoltage Recovery12 V & 12.6 V
Input Overvoltage Shutdown15.5 VDC
Output Power Warning / ShutdownWarning / Error code
Output Short Circuit ProtectionError code
Temperature Warning / ShutdownWarning / Error code



Display Panel PortRJ12
Inverter ModeInput V, Output Power
Charger ModeStatus, Battery Voltage
Warning and Fault CodeYes
LED IndicatorYes (Status, Display)



Charge Voltage Range13.5 - 14.4 V
Float Voltage Range13.4 - 13.8 V
Charger current (Maximum)40 A
Charger current setting (Manuals / Auto)5, 10, 20, 40 / Automatic
Charge ControlBulk / Absorption / Float
Charging Battery TypeGEL, Flooded, AGM, Fixed
AC Input Voltage / Frequency230 VAC - 50 Hz
AC Input Voltage Range180 - 260 VAC
Charger Efficiency> 80%
Dead Battery Charging1 VDC
Over Charge ProtectionYes, Error code
Over Temperature ProtectionDe-rated / Shutdown



Transfer time< 30 ms
Transfer Relay16 A
AC Input Source Setting8, 10, 16 A
AC Input PortHeavy duty connector 16 A max
AC Output Port 1Schuko, UK, Auz
AC Output Port 2Heavy duty connector 16 A max



StandardsCE LVD

WhisperPower Supreme Combi 12 V / 1200 W – 40 A

SKU: WP-61121240
  • We understand there may be circumstances where you may need to return an item to us. Our returns policy is set out below. We will always process returns in accordance with this policy.


    If you have any questions about making a return, or about the contents of this policy, you can contact us via email at


    If you are not happy with the way we deal with your return, you can raise a complaint. Please email us via for further assistance.


    If You Change Your Mind

    This section sets our policy in respect of 'change of mind' returns. Please refer to the section below in relation to faulty items.

    Before Dispatch

    If you change your mind after you place an online order, you will have 15 minutes after placing your order to cancel it. You can do this by contacting us within this period. Please also indicate the time the order was placed, and the time of sending the email for reference. 

    If payment has not yet been taken, we will not charge you after you have cancelled your order. If payment has already been processed, a refund will be sent to your original payment method.


    Changing Your Mind - After Dispatch

    If you change your mind after you receive your item, you should notify us of this within 14 calendar days of you receiving your item.


    In order to return your item you should:

    1. Ensure that the item is still in the same condition that it was in when purchased, with all tags and packaging in tact. 

    2. Notify us within 14 days that you would like to return the item by emailing us via

    3. Once you have notified us of your return, you will receive an acknowledgement and instructions confirming how to return your item to us. Returns should be returned to us via a courier with relevant tracking methods.

    4. You must cover the postage and shipping costs of your return. You should purchase a shipping labels for your courier.

    5. You must ensure that your item is returned to us within 14 calendar days of us acknowledging your return request.


    Once we received your return item, we will conduct a quality check and we will notify you of the outcome of this. If your item is returnable, your refund will be sent to your original payment method within 10 calendar days.


    If your item is faulty of unsatisfactory, please refer to this section.


    We really hope that you will not need to return a faulty item to us. If you do need to do so, please follow these instructions.

    If you are returning a faulty item within 30 calendar days of receiving your goods (or them being fully installed, if we have installed them for you) you can request a refund from us.

    If you are returning a faulty item after this period you may request a repair or replacement from us in the first instance. If you are still not happy after a repair or replacement, you may be entitled to all or some of your money back, in accordance with your consumer rights.

    If the issue relates solely to a faulty installation (by us), you may request that the item is repaired or replaced and re-installed.


    How To Return a Faulty Item

    If your item is faulty, you should:

    1. Notify us of the faulty by email via

    2. Once you have notified us of the fault, you will receive an acknowledgement and instructions confirming how to return your item to us.

    3. We will cover the postage and shipping costs of your return and instructions confirming how to return your item to us.

    4. The courier will usually specify that the label be used within a fixed period. You will be provided with instruction about this with the shipping label.


    Once we received your faulty, we will conduct a quality check and we will notify you of the outcome. If you are entitled to a refund, this will be sent to your original payment method within 10 calendar days following the outcome of the quality check.


    If you entitled to a repair, replacement or re-installation, we will arrange an engineer attend the site within 10 calendar days to assess the damage / issue and conduct a quality check.


    The rights in this section exist separately from any warranty you maye also have. Please contact us via to discuss any applicable warranty.

bottom of page