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 > Quality Question about Small Inverters

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Lwiddis

Lone Pine, CA

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Posted: 03/11/20 05:17pm Link  |  Quote  |  Print  |  Notify Moderator

nd, this is common:

“Efficiency: With 14 VDC input and a 100 Watt load the efficiency of the inverter measured 88.4%. That is very good for an inverter with true sine wave output. Efficiency at full load drops slightly and measured 86.4% with a 285 Watt load and 13.1 VDC input.”


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crcr

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Posted: 03/11/20 06:07pm Link  |  Quote  |  Print  |  Notify Moderator

Morningstar SureSine 300 watt inverter. Surge to 600 watt for up to 10 minutes. These numbers are real world, as opposed to many inverters which don't really put out the rating. It has no fan, so a very low 55 mA self consumption. Peak efficiency of 92%. You can buy them new for $266 shipped on ebay.

I have one of these and am very happy with it. Not cheap, but you pay for quality. Use any small gauge two wire cable to run to any inexpensive toggle switch for a remote inverter switch.

https://www.morningstarcorp.com/products/suresine/

time2roll

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Posted: 03/11/20 06:17pm Link  |  Quote  |  Print  |  Notify Moderator

+1 for GoPower sine wave. Lowest idle draw and a provision to add a remote power switch.

The low cost inverter if lightly used should serve you well.


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BFL13

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Posted: 03/11/20 06:41pm Link  |  Quote  |  Print  |  Notify Moderator

Lwiddis wrote:

nd, this is common:

“Efficiency: With 14 VDC input and a 100 Watt load the efficiency of the inverter measured 88.4%. That is very good for an inverter with true sine wave output. Efficiency at full load drops slightly and measured 86.4% with a 285 Watt load and 13.1 VDC input.”


Efficiency is watts out vs watts in.

The 100w load (out) and 88.4% means input was 113w. 14v in means amps were 113/14= 8 amps.

We usually use a divide by 10 for amps draw so that is 8 amps vs 10 using the 10 rule.

285w out at 86.4% is 330w. So amps were 330/13.1 = 25 amps vs 33 using the 10 rule.

I suspect those efficiency numbers do not take into account real world inverter to battery wiring and you should still use the divide by 10 rule for guesstimating

Idle draw is a different thing from running load efficiency. Eg the idle draw with an inverter/charger is high from all the fancy features that are always live.


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Ron3rd

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Posted: 03/11/20 07:24pm Link  |  Quote  |  Print  |  Notify Moderator

SpeakEasy wrote:

Ron3rd wrote:



But here's the deal on inverters; The cheapest have dirty power and are not thermo-controlled, and have noisy fans that run all the time.

The better ones are pure sine wave, clean power, that have thermo- controlled fans that run only when needed.

The top tier (expensive) inverters (like Morningstar) don't have fans at all.

I have a Samlex 300 watt PST series inverter that I bought from Best Converter about 5 years ago and am very satisfied. Very quiet thermo-controlled fan, when it comes on at all. They go for about $145 now.


I'm looking ONLY at pure sine wave inverters. And the one that I'm looking at in the <$50 range also says it has a thermostatically-controlled fan.

-Speak


That's gonna be tough. Let us know what you find out about it.


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Posted: 03/11/20 07:29pm Link  |  Quote  |  Print  |  Notify Moderator

SpeakEasy wrote:

And the one that I'm looking at in the <$50 range also says it has a thermostatically-controlled fan.
Buyer beware. You know what we think.

Fisherman

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Posted: 03/11/20 08:01pm Link  |  Quote  |  Print  |  Notify Moderator

I also have the Go Power 300 PSW for about 6-7 years now and quite satisfied. The only thing I use it for are the LED TV and Satellite receiver. Nice addition is the easy install remote switch.

dieseltruckdriver

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Posted: 03/11/20 09:20pm Link  |  Quote  |  Print  |  Notify Moderator

I bought one of these Victron PSW inverters.

It has a remote switch that I wired to a switch near our tv and have been happy with it.


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MrWizard

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Posted: 03/11/20 11:58pm Link  |  Quote  |  Print  |  Notify Moderator

Amazon is listing the Bestec 300w PSW
For $45.99


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SpeakEasy

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Posted: 03/12/20 06:57am Link  |  Quote  |  Print  |  Notify Moderator

MrWizard wrote:

Amazon is listing the Bestec 300w PSW
For $45.99


Yeah. That's one of the ones I saw.

Still haven't decided.

I plan to use an inverter to charge my laptop when boondocking. Also to watch TV, possibly. The TV I have draws 45 watts, so draw is not an issue. But interference probably is.

-Speak


It's just Mrs. SpeakEasy and me now (empty-nesters). But we can choose from among 7 grandchildren to drag along with us!



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