MPPT controller

Discussion in 'Solar Power' started by stevec, Jun 12, 2014.

  1. stevec

    stevec Funster

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    I want to fit a solar panel this summer and use an MPPT controller. Has anyone any experience of these and can recommend one that won't cost an arm and a leg? I've seen several on ebay and some from overseas. Has anyone had one of these and did they have any duty to pay?
     
  2. Techno

    Techno Funster Life Member

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    It depends on your personal view of "an arm and a leg"
    I buy from Taiwan and often import duty of £16 is added if you are unlucky
    The unit I use in its various marks has served me without issue for near four years since the mk1 version
     
  3. ivorantony

    ivorantony Funster

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    I use the same type as techno and also without a problem, be careful on eBay though their lot that are listed as MPPT but are really PMW type that loose quite a bit in efficiency, so worth paying a bit extra then fit and forget,
    MPP solar is the company that I used,
     
  4. Techno

    Techno Funster Life Member

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    My most recent purchase of a 200watt model was hit for £22.19 this week.
    This makes it £93 plus time and petrol collecting.
     
    Last edited: Jun 13, 2014
  5. vwalan

    vwalan Funster

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    i have been using pwm reg for years cant see its really worth changing it . far better to add another panel. even the panels i bought seconhand in morocco 14 years ago are doing ok .
    first regs werent even pwm . but did a fair job .
     
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  6. ivorantony

    ivorantony Funster

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    I agree if your system is already up and running and performing ok then I wouldn't incur the extra expense , but for somebody contemplating an new solar panel kit it worth paying the extra for an MPPT controller IMO ,
    With my Two 100w panels giving out 40 volts joined in series,
    I get on average 10 amp to the secondary leisure battery bank when needed in this country, and likely and bit more when abroad, it just maximises the panels output,
    without having extra panels/ cable/ roof glans/ WEIGHT :BigGrin:
     
  7. Busman

    Busman Funster

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    Sorry if this is a silly question but why have 2 100w panels when you can have 1 200w panel
    Thanks
    Dave
     
  8. Techno

    Techno Funster Life Member

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    It's all about dimensions. Could you fit a 200? I doubt it. There are other advantages to two panels over one but it has been said many times over already.
     
  9. Techno

    Techno Funster Life Member

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    A typical roof. Where would you put a 200 watt single unit even if it was beneficial

    [​IMG]
     
  10. Busman

    Busman Funster

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    Thanks so it's a dimension issue then
    Ta
     
  11. Daifuse

    Daifuse

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    I got hit too, this week. I also had to pay £22.19, £14 HMRC and £8 charges (?) but it's fitted and seems to be doing the job. (It should do after costing £87.00!)
     
  12. Techno

    Techno Funster Life Member

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    My 300watt MPPT hit and surpassed the magical 20 amps between the clouds on Saturday.
    This very easily keeps the voltage well above the 12.5 volt cut off of my CBE CSB2 that allows my solars to supply my 160 litre fridge freezer.
    A PWM regulator would struggle as it spends 25% of it's time turned off by the nature of how they regulate.
    My MPPT is ON 100% plus it maximises the available power by electronic wizardry. :Laughing:

    My solars are only rated at 5.6 amps each so clearly the mppt is improving that claimed output.

    Any mppt regulator is 25% more efficient simply because it charges constantly not by modulation. This is further improved by the ability to manipulate the voltage at the maximum power point for any given conditions.
    [​IMG]
     
  13. Jimbohorlicks

    Jimbohorlicks Funster

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    Hi
    can you please satisfy my curiosity and advise what you use on the load output on your MPPT controller ( the bulb icon) -I thought this was for a night-time timing situation or can it be used for something else?
    thanks:thumb:
     
  14. Techno

    Techno Funster Life Member

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    Mine feeds the 12 volt socket in the adjacent box , I fused it at 15 amps and mainly use it to feed my wifi hub.
    The load terminals on this regulator are ON 24/7
     
  15. Jimbohorlicks

    Jimbohorlicks Funster

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    Thanks Andy
    so the power is there when you require it and not being used all the time?

    :thumb:
     
  16. Techno

    Techno Funster Life Member

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  17. stevec

    stevec Funster

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    Techno and Ivor.....you alude to an MPPT controller but which one are you using? And will I have to use two panels in series to get the volts up or will it work ok on a single panel?
     
  18. Techno

    Techno Funster Life Member

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    It will work fine on one or two panels up to 300watts depending on whether you buy a 200watt or 300watt unit
    It will work with 12 volt panels in series (2) but personally I have 3x100 so series is not an option. Mine works perfectly with 300 in parallel
    It can also handle 24 volt panels
     
  19. Techno

    Techno Funster Life Member

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    This is probably what you want
    http://www.ebay.co.uk/itm/130882109279

    He'll probably accept £71 but it's fairly certain you'll be hit for £22 by parcel force
    Still worth it compared to uk offerings
     
  20. stevec

    stevec Funster

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    Thanks Techno, I was looking at the Tracer units with remote display but there is quite a hike between the 10A unit (ok for now) and the 20A unit (would be better for any later upgrade). You obviously have had no problem ordering from abroad. What was delivery time like? And was there any import fees other than the ParcelForce ones (or did this include taxes)?
     
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