[C320-list] Inverter size?

[Stephen Cox]

Does the inverter put out a sine wave, a modified sine wave or a square wave?
Switch mode power supplies really need a sine wave to work properly and cheap
inverters often don't provide that.

Regards,

Stephen Cox
Tegwen #1141 

> -----Original Message-----
> From: C320-list 
> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of 
> Scott Westwood
> Sent: Wednesday, December 18, 2019 10:09 AM
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] Inverter size?
> 
> FWIW. My PC power supply  is 1.5A 120v input and output 19v 
> 4.74A 90w max. My wife's  ps is 135w 20v with details of 
> input 100-240v 2A and output 20v 6.75A. Left hooked up 
> motoring about 5 hours hooked directly to house bank on brand 
> new (but cheap harbor freight) 400w inverter and did not 
> charge. Hers or mine. Maybe bother ps's are "bad"?  Charge 
> when in regular a/c outlet???
> Sent from AT&T Yahoo Mail on Android 
>  
>   On Tue, Dec 17, 2019 at 3:23 PM, Scott 
> Westwood<scottwestwood at bellsouth.net> wrote:   About 4 or 6 
> gauge 2ft long with batt clamps that came with it. directly 
> on batt (to test)
> 
> Sent from AT&T Yahoo Mail on Android 
>  
>   On Tue, Dec 17, 2019 at 2:10 PM, Graeme 
> Clark<cg at skyflyer.co.uk> wrote:  150W was fine for an older 
> windows laptop I had but wouldn't keep a MacBook charger 
> happy. I switched to 300w and its been fine since.
> 
> Do you have a true 12v at the input to the inverter? I used 
> some pretty thick gauge wire to wire up my cigar lighter into 
> which the inverter plugs but you might be suffering a voltage 
> drop or other resistance that drops the input voltage?
> 
> 
> 
> 
> Graeme Clark
> “Jaskar”
> Built 1996
> Hull #366
> Location: Falmouth, United Kingdom
> 
> > On 17 Dec 2019, at 18:31, jackbrennan 
> <jackbrennan at bellsouth.net> wrote:
> > 
> > Hi Scott:
> > Something sounds wrong. 400 watts should be plenty. That's 
> roughly 25 amps in 12 volts or 2.5 amps at 110 volts. 
> > My 400 watt inverter will charge a laptop easily.
> > 
> > Jack Brennan
> > Sonas, 1998 Catalina 320
> > Tierra Verde, Fl.
> > Dolphin Cruising Club of Tampa Bay
> > 
> > Sent from Yahoo Mail on Android
> > 
> >  On Tue, Dec 17, 2019 at 1:23 PM, Scott 
> Westwood<scottwestwood at bellsouth.net> wrote:  Traveling so 
> hard to research.  Does anyone know what size inverter I need 
> to charge an older laptop onboard?  We had a 175w then tried 
> 400w. The 409w sort of maintains (plugged in not charging).  
> Any thoughts?
> > 
> > Sent from AT&T Yahoo Mail on Android
>