Inverters - Which One?

Does it need to be sine wave or will modified wave do?
I have a fisher and paykel and am looking around for the same reasons as you, the tech I spoke to said mine would run on modified wave but would perfer the pure sine wave variety. Is a saveing of $236 worth $1000 + dollars for a new cpap?
Mine requires a "minimum" of 300w, Im tending to look at the 500w units, Im not likeing the answers on price either.
That and the size of the batteries required to run it for longer than a night or 2.
Does the S8 also run on 12V??

I'm using a 150 w Alessi pure sine wave for my Resmed S7. Will run the CPAP fine without the humidifier and can usually get 3 nights out of a 105 a/h AGM battery. If you can get away without using the humidifier then you can save on quite a lot of battery power. When I bought mine I was told that for most medical equipment, pure sine is recomended.

Cheers Dave

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500 Watt (1000W Surge) 12 VDC to 230 VAC Electrically Isolated Pure Sine wave Inverter

Techstore Special Only
Not available through stores
- Ex-Repaired Stock -
Very limited in quantity

Pure Sine Wave
This excellent inverter is rated at 500 watts continuous output and is electrically isolated between battery and secondary voltage. The unit is designed for fixed mounting and high performance. Housed in a strong aluminium case, the inverter features heavy- duty screw down input connectors, cooling fan, 3- pin 230VAC output socket, on/off switch and LEDs to indicate normal operation, overload condition and over temperature. The inverter output is fully protected against short circuits and overload. Typical applications are laptop computers, power tools, blenders, small refrigerators & microwave ovens etc.

Specifications:
- Output Power: 500 W continuous
- Surge Power: 1,000 W
- Standby Current: 1,400mA
- Input Voltage: 10 - 15V DC
- Output wave form: Sine wave
- Efficiency: >85%
- Output Regulation: +/- 3%
- Output Frequency: 50Hz
- Cooling: Internal fan

Protection:
- Output Short: Output short without blowing fuse
- Low Battery Alarm: <10.7 Volts
- Low Batt. Shut- off: <10 Volts
- Overload: Shutdown
- Battery reverse: Internal 40A Blade Fuses
- Input connector: 4 gauge
- Dimensions: 236 (W) x 83 (H) x 335 (L)mm
- Weight: 3Kg
QTY
1+ $179.95

Hi
We have a Jaycar 750watt pure sine wave one in the motorhome and it works great. Jaycar are fine and look after you
Ray

For the life of me I cannot understand why you don't buy a CPAP with 12V capability. All this mucking around only detracts form what you are trying to enjoy...just too many hassles!! IMHO of course.

If you need an humidifier as well and most do these days I understand, you will need 300W with a good sine wave. I have a DSE one. Make sure your connections are all good to it, even if you have a 50 amp Anderson plug, you could have problems occasionally with some dirt or something restricting the connection.

I think my DSE one is modified sine wave.

As to whether you go for a 12v one, some of the newer ones have a 12v capability to connect somehow, but it is good to have a log of your treatments for compliance purposes, which ever way you go. Having been diagnosed, an electronic log in case of accident will be a lot better for any insurance purposes.

Give me a ring.

thanks for your input guys. Have purchased the Powertech 500 watt model from Jaycar, it gets installed tomorrow, and then on Saturday, we head for the Gunbarrel.