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Author Topic: Recommendations for 1200W-2000W off-grid inverter  (Read 4892 times)
stephendv
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« Reply #15 on: May 07, 2014, 07:39:06 AM »

Thanks all, going for the Victron because of it's popularity and future paralleling ability.
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2.8kW PV, SMA Sunny Island 5048, 5 PzS 700 battery bank, stinky diesel.
billi
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« Reply #16 on: May 07, 2014, 08:44:17 AM »

Quote
If you have a boat then go Victron, supported in every port and designed for Dutch barges with the marine market in mind, Victron are very big in the marine sector and it's what they understand.....
If you want Swiss engineering in a camper or house then go Studer, they really are like a Rolex.

If you're skint, don't mind the huge losses in efficiency and don't need a charger then go UPS.

Sure, they'll all do the job and probably do it well, you 'pays your money and takes your choice' I guess, me I'm going SMA because 'AC coupling' works for me.

Are you anchored  in the last century Paul ?

Victron and Studer are big into off grid and especially  grid tied battery based FiT harvesting ideas ...
Studer  is the first Inverter company that i know of , introducing an off grid inverter that variable adds inverted battery power to AC house loads
Victron ....http://www.victronenergy.com/upload/documents/Whitepaper-Self-Consumption-and-Grid-independence-with-the-Victron-Energy-Storage-Hub-EN.pdf
You will see more and more DC ideas coming in future , cause the AC coupling storage ideas aint efficient  enough ...
some storage based systems like this http://www.dc24.de/dc24_stromspeicher_home/funktionsweise.htm (sorry in German )
are using MPPT chargcontrollers and batteries in the same voltage range as  the Grid tie inverter  so  PV power flows direct to Grid , battery and consumers , at night battery powers the same GTI to supply  as much  juice as power consumers  are on in the house

So it seems  some have learnt the lesson  , that a nightly supply of power is better done with DC coupling

SMA basically are a GTI manufacturer  that grew up in Germany while technology was needed for "Feed the Grid " ,

But sure the Sunny Island is a fabulous off grid inverter from SMA  ,

Billi










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1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
stephendv
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« Reply #17 on: May 07, 2014, 08:52:10 AM »

Speaking of Studer, have you chaps seen their new MPPT controller: http://www.studer-inno.com/?cat=mppt_solar_charge_controller&id=2101

Rated at 120A and with 2 independent MPPT trackers able to accommodate 900V solar array  whistlie
Could be a very nice option to minimise wire losses and DC breakers on large systems.
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Tinbum
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« Reply #18 on: May 07, 2014, 08:54:57 AM »

At the moment I think the biggest problem in the UK is that there isn't an approved DC meter so to get FIT payments you have to go to AC and then back to DC.
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camillitech
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« Reply #19 on: May 07, 2014, 09:18:07 AM »

Interesting links Billi, I said it's my take and may be tosh. I still have DC inputs but AC works for me because of the large distances between my turbines and panels and the size of my mini grid. I have literally miles of cable in my AC grid supplying three properties seven sheds and one large agricultural building. Also I don't really plan on storing most of my energy in inefficient batteries but rather as water heated by AC.

Cheers, Paul
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'Off grid' since 1985,  Proven 2.5kW, Proven 6kW direct heating, SI6.OH, 800ah Rolls, 4.75kW PV ,4xTS45, Lister HR2 12kW, , Powerspout pelton, Stream Engine turgo, 60 x Navitron toobs and a 1500lt store. Outback VFX3048 and 950ah forklifts for backup,
Eccentric Anomaly
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« Reply #20 on: May 07, 2014, 10:09:00 AM »

Speaking of Studer, have you chaps seen their new MPPT controller:

Very interesting. I don't think anybody knows the price, yet, though:

http://www.photovoltaikforum.com/allgemeine-anlagenplanung-f69/pv-inselanlage-problemloesung-t98399-s30.html
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stephendv
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« Reply #21 on: May 07, 2014, 10:16:50 AM »

Might be indicative pricing here: http://www.solarenergy-shop.ch/index.php?cat=KAT14&lang=DEU&product=P0762   ~ 1700 GBP.  Looking at the prices for the other known kit they stock like MS Tristar MPPT 60A, looks like that shop is very expensive in general.  Apply 0.52 derating to bring it down to realistic levels = 850 GBP.
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2.8kW PV, SMA Sunny Island 5048, 5 PzS 700 battery bank, stinky diesel.
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