Power Inverter

Submitted: Monday, Aug 02, 2010 at 13:00
ThreadID: 80467 Views:2659 Replies:5 FollowUps:8
This Thread has been Archived
Hey guys i would like to put and inverter into my navara and i just need some help selecting a brand to go with as i no nothing bout the brands in this area. Much will be appreciated.

Cheers Adam
Back Expand Un-Read 0 Moderator

Reply By: Member - Andrew (QLD) - Monday, Aug 02, 2010 at 13:43

Monday, Aug 02, 2010 at 13:43
Unfortunately the question is like asking what brand vehicle should i buy? Although there are some good concepts to generally go for, without knowing the intended use, anticipated loading, budget, location(possibly) etc it is difficult to give a brand recommendation. Business members may push their brand as best, others will swear by cheapies for certain applications. YMMV.

BTW i own an good, old pure sine wave model and newer, cheaper modified wave version, different brands....each have their uses, though no one can do all that i require.

Hope that helps ;)
AnswerID: 425967

Reply By: WATTS2C - Monday, Aug 02, 2010 at 13:56

Monday, Aug 02, 2010 at 13:56
This post has been read by the moderation team and has been moderated due to a breach of The Advertising/Self-Promotion Rule .

Forum Moderation Team
AnswerID: 425969

Reply By: Member - Oldbaz. NSW. - Monday, Aug 02, 2010 at 14:03

Monday, Aug 02, 2010 at 14:03
G'day Adam, I must agree with Andrew above, but add the following for your
general info. I dont know the brand but I bought a 1200w continuous modified
sinewave for less than $150 off eBay.Chinese ?..sure..but it runs two 3 way
fridges in the back of the Jack while mobile & they perform perfectly...much
better than on 12v. Inverter is hard wired to battery with 6 awg wire..positive
& earth. cheers...oldbaz.
AnswerID: 425970

Follow Up By: Peter_n_Margaret - Monday, Aug 02, 2010 at 15:16

Monday, Aug 02, 2010 at 15:16
"Modified sine wave" means 'square', or worse. Some electronic gear will be wrecked by the power spikes that some of these produce. Somw gear won't run on them at all.
Personally, pure sine wave only, for my money.

FollowupID: 696541

Follow Up By: Allan B, Sunshine Coast, - Monday, Aug 02, 2010 at 16:58

Monday, Aug 02, 2010 at 16:58
I agree with Peter. The term "Modified Sine Wave" should never have been coined. It is actually Modified Square Wave and does not approximate to a sine wave at all. It merely has approximately the same peak and RMS characteristics as an equivalent sine wave (same as mains power) but that does not mean it will satisfactorily supply appliances that require sine wave power. Unless you know your appliances' requirements then you use one at your peril.

There may be good reason why Oldbaz (above) uses one with success on his 3-way fridges. These fridges have only a heater element to be powered and this will work satisfactorily on modified sine wave, or even on square wave for that matter. The fact that his fridges work better than when on 12 volt simply reveals that the inverter is supplying more power in that mode, not that modified sine wave is better all-round power.

Like most things electrical, there is a lot more to it than the simplistic reasoning that some people employ.

Navara, try Googling "modified sine wave" and you will find many responses that may overwhelm you, but most will warn you of the perils of square and modified sine wave inverters. Unless you are certain that "Modified Sine Wave" will suit your purposes then spend a bit more and purchase a Sine Wave inverter. It could be good insurance.

The same comments as above apply to portable generators in regard to selecting their output waveform.


My Profile  My Blog  My Position  Send Message

FollowupID: 696548

Follow Up By: Dennis Ellery - Monday, Aug 02, 2010 at 21:38

Monday, Aug 02, 2010 at 21:38
Just how close to pure sign wave is your pure sign wave inverter, is the question.
Pure sine wave and modified sine wave inverter outputs are both modified sine waves.
But one is closer to pure sine wave than the other.

Regards Dennis
FollowupID: 696576

Follow Up By: Allan B, Sunshine Coast, - Monday, Aug 02, 2010 at 22:31

Monday, Aug 02, 2010 at 22:31
Hi Dennis,

Well I doubt that any inverter marketed as "Pure Sine Wave" is anywhere near "pure" but possibly most on the market today are near enough for practical purposes. I just wish they were marketed as simply "Sine Wave" rather than "Pure".

I have had the oscilloscope on mine and it is not too bad. Changes a bit with varying loads but no nasty spikes or harmonics. Looked a bit like a sine wave with shoulder pads! The load type (inductive, capacitive or resistive) also affects the waveform but not markedly. Suits my purposes.

I have no supporting evidence, but knowing the necessary strategies required to produce an approximated sine waveform, I would expect that the waveform "quality" would be somewhat linked to the purchase price. In other words, you probably get what you pay for. That also goes for the load devices powered by the inverter......... the more rudimentary switch-mode power supplies are likely to be less tolerant of the quality of the waveform supplying them. No proof, just a hunch, but there is bound to be exceptions and I have seen some!

And yes, I agree.......... "one is closer to pure sine wave than the other".


My Profile  My Blog  My Position  Send Message

FollowupID: 696584

Follow Up By: Dennis Ellery - Monday, Aug 02, 2010 at 23:57

Monday, Aug 02, 2010 at 23:57
Yep the quoted “pure sine wave” ones are close enough for what we want, though I don’t have one.
I have a “modified one” that has run the following without killing them, a laptop’s power supply, an electrical drill, a small TV, a mobile telephone battery charger and NiMh battery charger.
I would try it on other equipment but it is only a 300 watt unit.
I would plug anything into it, as a test, if the gear I was trialling was under warranty.
DON’T TRY THIS AT HOME it’s not a recommendation – I don’t want people complaining that their gear went up in smoke on my say so.
Regards Dennis
FollowupID: 696587

Follow Up By: Dennis Ellery - Tuesday, Aug 03, 2010 at 00:06

Tuesday, Aug 03, 2010 at 00:06
Forgot to mention - The supplier of my satellite disk agreed that it wouldn't hurt his decoder box (after I told him I'd tried it).
Regards Dennis
FollowupID: 696588

Reply By: Maîneÿ . . .- Monday, Aug 02, 2010 at 16:37

Monday, Aug 02, 2010 at 16:37

first you have to know what your going to be running with it Wattage wise?

Is no good getting a fantastic bargain ($300 for $80) 200 Watt inverter, if you will need 1200 Watts.

That is your first decision, second decision is *Pure Sine* Wave or not PSW ?

Then when you know what you need, get a model with a good warranty, with a *FAN* to eliminate build up of internal heat, not elcheapo heat bank system.

There are various brands that are out there, some are just copies of quality products and they are less expensive because they often use less expensive components, this is where warranty is important and manufacturers back up service is paramount.

I suggest you buy from company with a good reputation, and this is not meant to eliminate small companies, they often give better service than the big guys.
All recommendations can then be checked on G00GLE, so you’re satisfied you have made the correct decision for yourself after getting various recommendations.

Maîneÿ . . .
AnswerID: 425982

Follow Up By: Allan B, Sunshine Coast, - Monday, Aug 02, 2010 at 17:01

Monday, Aug 02, 2010 at 17:01
Good advice Mainey.


My Profile  My Blog  My Position  Send Message

FollowupID: 696549

Reply By: Joe Grace Doomadgee - Tuesday, Aug 03, 2010 at 00:00

Tuesday, Aug 03, 2010 at 00:00
basically only 2 things as explained above..............
What do you want to run and how big a battery set up do you have to power it...............
We have a small 300w just simply for chargers ect that dont have 12v adaptors and that is as big as we need, any bigger and you need to look at a second battery and all the gear that goes with it....... it is fixed to the cabin wall and allows you to plug in ya mobile/laptop whilst diving, hence it is charging the batts at the same time....
Always look for the option of 12v power for it as the inverter it's self uses power simply to convert it to 240v, you really dont have much, if any call for an inverter for a simple 4wd set up, incluiding a camper, if a caravan then look at solar and batts in the van it's self and again look at what you can get in 12v before you look at installing an inverter ....
Cheers n good luck
AnswerID: 426035

Follow Up By: Member - Oldbaz. NSW. - Tuesday, Aug 03, 2010 at 08:29

Tuesday, Aug 03, 2010 at 08:29
I went the inverter path on the advice of my BIL, an electrician, who predicted improved performance of my 3 ways on 240v, & he was correct. Your assertion
that over 300w requires a second battery is not accurate. I have only the cranking battery & this is more than adequate to power the inverter & all other
devices while driving. Stationary power is supplied by a Honda 20i genny or gas
or mains 240v. The solar option is expensive, & so is the extra battery under the
bonnet. My system is more flexible, gives power day or night, utilises existing 240
appliances & tools, & cost a fraction of an equivalent 12v system....oldbaz.
FollowupID: 696604

Sponsored Links

Popular Products (1)