Feed in Tariffs - Utility Recommendation



  • all small inverters are lower effciency

    3kwp and above offer higher effciencies 95/96%
    bigger 10kwp units to 98%

    why did he fit two inverters - one per roof
    best option inverter with twin mppt trackers for split roofs
    basically two inverters in the one box
    ideal if one roof is shaded , as roofs are separted in the inverter
    transformless for higher outputs and works out cheaper
    than fitting and supplying two inverters

    eg sma SB4000TL-20 96%
    power one PVI-3.0-OUTD 96%
    steca SG2000 + slave
    and others

    you could also add extra panels in the future
    phono ps240 cheap asian units
    you would get much higher FITs with higher effciency modules eg sanyo 240wp kyocera solarworld
    and as these are smaller , so more panels in the same m2

    gjpountain wrote: »
    Thanks for your post have found it very interesting especially the point about the use of smaller inverters - see below.
    The bit about the effect of shading on an overcast day is not clear -see below. Would be grateful for your further comments.

    The strange thing is of course on a very cloudy overcast wet day
    there is no discernable shadow so don't think shading is a problem on such a day.
    By the way these are the bad days (since 29/10/2010)
    2/11/2010 = 200 watts
    4/11/2010 = 100 watts
    8/11/2010 = 300 watts

    Best Days
    30/10/2010 = 5,100 watts
    01/11/2010 = 4,800 watts
    6/11/2010 = 4,900 watts
    15/11/2010 = 4,400 watts
    Be interested if you and others had the same good and bad days and was the difference as great between the worst and the best

    Before installation during September I took many photos of the roof to see the effect of shading on roof 1 (South East facing). However whilst I am sure that during the summer months I have arranged the panels so that no panel is overshadowed after about 9am the sun has sunk so low in November (and will get worse until 21st December) that one of the panels is partly shadowed until about 1pm.
    The other roof (6 panels south west facing) has a problem with a tree from next door. ( this did not seem a problem in September when the sun was higher. On a sunny day the leaves from this tree shade some of the panels for about an hour (around midday) and have noticed that the out-put from the panels halves during this time (from say 600watts per hour to 300watts per hour), This has no effect on an overcast day. The good news is that I have spoken to my neighbours and they are happy for me to chop down the last 15' of this tree (it may take a couple of years to grow back!). I have four trees in my garden which affect the panels from about 2pm - these I will have cut back this week as they have now lost their leaves. ( by the way I have about 14 trees in my garden some of which have preservation orders so these I can not touch). Much as I like trees they do grow very quickly and can shade everything and nothing grows beneath - not even grass.

    The other point you mention is the inverters. I have 2 sunny boy sma 1200 inverters and questioned that I thought they should be sunny boy 1700 inverters. However I was given access to the free downloadable saftware:
    This showed that for 6 phono-solar panels 240watt the sma 1200 was more efficient than the sma 1700. So from the inverters their max outpout is 1200watts each - and they are only 92% efficient.
  • edited 12 September 2011 at 8:31PM
    muleridermulerider Forumite
    293 Posts
    edited 12 September 2011 at 8:31PM
    Gizmosmum wrote: »
    Tried Good Energy - you have to have your electricity with them:(, tried EDF who I have got electricity with and wont be moving before March but if and when I do move I have to move my FiT payment too :(. Trying Ecotricity now they seem to have a lot fewer strings attached.

    I have emailed all the required documents to Microtricity (Ecotricity) today. We had a 2.25kW system commissioned last Wednesday and it has already produced 27kW. We live in a ground floor apartment and could only fit 9 panels on the roof.

    You can contact Jodie Humphries direct:

    01453 761391 or email her at [EMAIL="microtricity@ecotricity.co.uk"][email protected][/EMAIL]

    I called to check she had received the application.

  • You have to be a Ecotricity customer to register for the feed in tariff so I'm now registering our solar pv system with E.on. You need to provide a copy of the MCS certificate, photo ID and the system invoice with the E.on FIT application. You can call the FIT team on 01234 733 029.

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