Motech 3300MS inverter

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Motech 3300MS inverter

Postby helios » Sun Sep 19, 2010 11:31 pm

Has anyone had any experience with the Motech 3300MS inverter?

Does it have a transformer and is it suitable for use with 2 strings of 100W thin films (1x3x6 + 1x3x5), total 3300W ?
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Re: Motech 3300MS inverter

Postby Tracker » Mon Sep 20, 2010 1:22 pm

.
http://www.energymatters.com.au/images/motech/PVMate%204600MS%20.pdf

They seem to describe the device in an unusual manner, but it does read to be a DUAL MPPT device.
They have carefully skirted the question of a transformer, but I suspect that it is transformer-less.. (that's good)

It "reads" fairly well, and I do like the forced cooling. I would be happy to hear more about it...

As EM sells them, you could give them a ring to confirm..
..
.
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Re: Motech 3300MS inverter

Postby bpratt » Mon Sep 20, 2010 7:53 pm

Just reading the specs, and I'm wondering where they got some of their comparison specs from.

The SMA SB5000TL is claimed to have a max input voltage of 750V, when it's really 550v. Nom PV Power Max of 6.0Kw for what is sold as a 5Kw inverter.

Nom rated current Max of 22A (2x11), when Sunny Design talks about 15A x 2, so 30A in Motech speak. :)

:)
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Re: Motech 3300MS inverter

Postby Tracker » Mon Sep 20, 2010 8:10 pm

bpratt wrote:The SMA SB5000TL is claimed to have a max input voltage of 750V

Yep - I did not worrie too much about the comparisons, as the only meaningful ones are for the device itself.

bpratt wrote:Nom PV Power Max of 6.0Kw for what is sold as a 5Kw inverter.

This could be spot on if there are declaring what we find in most systems, that you only get 80% of the design power any way.
..
.
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Re: Motech 3300MS inverter

Postby westy » Mon Sep 20, 2010 8:11 pm

Lies, damned lies, and statistics

I wish a company that could make such a "good" inverter could make professional looking info sheets. It might make us more likely to accept their claims.
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Re: Motech 3300MS inverter

Postby rg767 » Mon Sep 20, 2010 9:40 pm

I am pretty sure this inverter (or a rebadged one of the same type) got an A+ in Photon.

Will check tomorrow.
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Re: Motech 3300MS inverter

Postby rg767 » Mon Sep 20, 2010 9:41 pm

This could be spot on if there are declaring what we find in most systems, that you only get 80% of the design power any way.
..
.


Haha!

You never let up on this one!
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Re: Motech 3300MS inverter

Postby Tracker » Mon Sep 20, 2010 11:00 pm

.
rg767 wrote:You never let up on this one!

I would let up on it if I found that it was the MINORITY of systems that only ever produced 80% of the DP..

You who profess to be fully trained, quote PVWatts etc. as the gospel for determining Power Generation, and what is the figure used as a "Standard" derating --- 0.77 --- :o --- so am I not entitled to officially "presume" that an instantaneous power will likely be only 80% of DP, or are you happy to tell customers otherwise??
and again --- have we not found, time and time and time again, newbies asking the question "Why do I never see XX.Watts at midday , as sold to me when I paid for the solar system ?
..
Please - convince me that I am wrong ! :oops:
.
.
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Re: Motech 3300MS inverter

Postby rg767 » Tue Sep 21, 2010 12:22 am

I dont know anyone that tells anyone different - especially nowadays.

Sold on outputs per day - instantaneous doesn't matter.
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Re: Motech 3300MS inverter

Postby Tracker » Tue Sep 21, 2010 8:25 am

rg767 wrote:I dont know anyone that tells anyone different - especially nowadays.

Thanks for reassuring me, and I am most pleased that responsible installers are making the point clear to prospective customers, and we will naturally see a total drop in the number of people asking the old question.
"When will I ever see 2Kw from my 2Kw system?".. . . . ;)

This is no different to selling a litre of milk in a 200mL can and saying "but it actually 1L concentrated for packaging economy"..
... .. . What you get is as important as what you actually buy?

I must add that I have spoken to a few people in the last days, who are getting quotes, and not one installer has mentioned what they should expect to actually SEE on a daily basis, just what they could generate per day, and some seem a bit optimistic, raising the customer's expectation of shorter "Pay-Back" times.

BUT - you installers, who are being responsible, can easily turn this tale to financial advantage, pointing out that customers can benefit from the reality, and load their inverter with sufficient panels to actually generate the GCI limit.

We are told that they are actively selling 2.5Kw of panels with a 2Kw inverter in Victoria..
That has to be the most responsible way of doing it, both for the customer and the environment.

..
.
Retired Engineer and keen PV experimenter - Always ready to learn and share.
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