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Old 04-06-2013, 20:34   #1
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Sinergex/Cotek inverters quandry

Difference between the brands, at all?

Reason:
Ordered a Sinergex brand PureSine2-2000 watt, 12 VDC to 120 VAC inverter.
Received a Cotek brand SK-2000 watt, pure sine wave 12 VDC to 120 VAC.

Do any of you here at CF know about these? I've searched the web (and these forums) but cannot find anything relating to their possibly being different trade names for identical products. Although they certainly appear the same visually, I'm concerned about the internal electronics being of different quality.

I'd made a special order for this inverter, wanting the optional GFCI installed vice "typical" US standard AC outlets. (That was a three month delay.) And I'd rather know what I'm talking about before venting at the dealer.

So...Maybe somebody with a fast internet connection would like to accept the challenge? Is there really a difference between the two products?

Note: 7 hour time diff twixt AS and EDT. I'll respond as needed - maybe just not right away....
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Old 06-06-2013, 15:18   #2
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Re: Sinergex/Cotek inverters quandry

Well, no answers....
Thank you all who read the post.

James
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Old 06-06-2013, 21:28   #3
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Re: Sinergex/Cotek inverters quandry

I have never heard of either brand. Sorry.
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Old 13-06-2013, 10:58   #4
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Re: Sinergex/Cotek inverters quandry

I found posts stating Samlex and Cotek are the same.

The posting suggested Cotek is a manufacturer making relabels. I don't know, myself.
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Old 14-06-2013, 12:39   #5
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Re: Sinergex/Cotek inverters quandry

Update...
I've heard back from the manufacturer. They claim that those are different "brands" for different markets. Other than labels and case-colour, the units are identical.

My thanks for those who took an interest in this.
I'm sorry for wasting anybody's time.
James
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Old 14-10-2013, 23:49   #6
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How is the inverter performing any issues? I am considering one myself or one of thr newer inverter chargers.
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Old 22-10-2013, 13:13   #7
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Re: Sinergex/Cotek inverters quandry

Quote:
Originally Posted by Deep6 View Post
How is the inverter performing any issues? I am considering one myself or one of thr newer inverter chargers.
The inverter is installed and works as advertised. The pure sine wave seems to just function better than a modified sine wave for charging various AA or AAA batteries; our small household vacuum cleaner now runs without overheating; coffee maker now actually functions (but see below). Have yet to test it with the (not yet wired up) new water heater and anticipate no problems. (We've switched to all DC powered "entertainment", so no experience to relate for TV or stereo...)

But...

Now understand, these are things that I should have researched before purchasing, so no blame on the unit itself, okay?

There is no monitor or display to show how many DC amps the unit draws to provide that AC power. (Not even an after-market add on.) We are learning to live with that by keeping an eye on the solar controller's remote panel that reports battery state. (In other words, we don't know the draw, but see the result.)

The remote on/off switch requires a 3" tall by 2" wide space for mounting. And an 1 1/2" circular hole. Just for a little push on / push off back lit button switch. It's connected with a basic 4-wire telephone cable. In retrospect, I should have sussed out the wiring and installed a micro switch on my electric panel.

The unit's built in over-voltage protection is irritating, in that it doesn't "like" anything over approx 14.2 VDC input. Well, okay, but that means when the batteries are being topped up by the solar panels the inverter doesn't want to play.

Example: couple of cloudy days with light winds and the bats are a bit low. Then get a sunny day and the solar controller wants to run around 14.x volts to bulk charge bats. No inverter usage until that's completed. We can live with, of course. But it's irritating when the morning sunshine overpowers the inverter - and the darn coffee maker shuts off mid-perk!

Re: Inverter/Charger: Our troubles began when the Xantex Marine 2500 died. Since then, we don't use shore power, even when at a marina. Nor do we have a GenSet. Still, on the wish list is something that would accept (almost) any AC voltage input from 100 to 240, at either 50 or 60 Htz. Kind of like this: ProMariner ProNautic P 1260 Battery Charger

Hope this helps! And good luck in your search/purchase. Would you please let me know what you finally decide upon?

James
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Old 22-10-2013, 13:41   #8
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Re: Sinergex/Cotek inverters quandry

Hi James
First thing I would recommend is that you get some sort of proper battery meter installed - without it you are trying to 'drive your power system blindfolded'. The Victron BMV600 is a popular choice.

And from what I remember Cotek come out of a decent factory... and are fairly well put together, however that 14.2V limit is a pain ! In fact, if it's this model, that's not working properly as it's supposed to be 15.3V : http://www.cotek.com.tw/upload/PDF/SK2000.PDF

Hope that helps...
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