Will this help??

Discussion in 'Solar Power' started by wizzer59, Sep 1, 2011.

  1. wizzer59

    wizzer59 Funster

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    Last edited: Sep 1, 2011
  2. Snowbird

    Snowbird Funster Life Member

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    My advise is always get the best charge regulator you can afford and get one that is at least double the rating of your solar panel,just in case you ever decided to buy another panel. Have tried the cheap regulators in the past and as well as them not lasting long they have a lot of power loss. I now have fuzzy logic...whatever that is:Doh:
     
  3. Geo

    Geo Trader - Funster

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    Yes they are more effieciant
    At 20 amp you will have expandability certainly 2 more maybe 3 panels should you wish to
    However I cant help feeling due to the cost of these regulators that you would get better value from the £s spent by adding another panel instead,£ for £ the extra panel is far better value
    If you have not got the room for extra panels then a 10amp Mttp would be more cost effective
    geo
     
  4. wizzer59

    wizzer59 Funster

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    Thanks for the replies fellas, i think there is probably room for one more panel on the roof but with only 85amp to charge, didn't realy want to add too much weight but at the same time I won't have this van forever and the next one might have a lot more room so hence the 20amp. I just think Id rather have one panel working at its best than loads of panels weighing me down:Doh:

    But maybe Im wrong?:Blush:
     
  5. zaskar

    zaskar Funster

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    Hi Wizzer!:BigGrin:
    I'd be really interested to know how you get on with this controller.
    At the mo', I've just fitted a 185 watt 24V panel to the top of my 5th wheel in readiness (hopefully!) for going to Spain for the winter and quite honestly, I'm gutted at the rather pathetic output from the panel.
    I'm getting an average of 1 amp with a best in full sun(ish) of 5 amps which considering its a 15amp max panel, I'm rather disapointed with!
    I've even spent £200 on two new 110amp Elecsol batteries cos I thought my existing batteries were getting tired after two years Fulltiming but its made no difference!
    I cant decide whether its the lack of direct sun we've had in Cheshire for the past few months or if its the fact that I have a bog standard controller, not an MPPT which I believe are much better.
    I like the look of the one you posted cos its also got a digital readout which most MPPT's dont seem to have. The only thing that worrries me is ordering from Taiwan!:Eeek:
     
  6. scotjimland

    scotjimland Funster Life Member

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    what size of cable ?


    That's poor to say the least..

    What size cable are you using ? Too light and you will have significant volt drop which will drop the current ..

    Voltage drops through incorrectly sized cables are one of the most common reasons for low voltage system faults.

    there is a common misconception that the cable is sized for the max current without taking into consideration the system voltage, length of the cable and the acceptable volt drop. This is so important on low voltage systems ..

    to get the max out the panel you must have the correct sized cable ..


    For that size panel on a 3 mt run it should be at least 10mm2

    increase the cable length to 6mt and you need 16mm2

    handy solar panel cable sizer .. http://www.solar-wind.co.uk/cable-sizing-DC-cables.html
     
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  7. zaskar

    zaskar Funster

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    10mm2 !!!!!!:Eeek::Eeek::Eeek: Strewth thats heavy stuff!

    From panel to controller = about 2.5metres using 4mm2 (supplied)
    From controller to batteries = about 1 metre using 6mm2.(supplied)

    PLEASE dont tell me I need to start running thicker cables again!!!!!!:cry:
     
  8. scotjimland

    scotjimland Funster Life Member

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    sorry, if you want the max out of the panel.. that's the way it is..

    I'm amazed that some 'reputable' solar panel installers don't seem to understand this very basic electrical law..

    a panel comes with say 2 mt of 4mm2 and they think that it's perfectly acceptable to increase this length without taking into account the volt drop and increasing the cable size to match .. but how many are actually qualified electricians or where they fitting double glazing or kitchens in a previous life :RollEyes:
     
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  9. zaskar

    zaskar Funster

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    Actually, it was his sideline from making wooden childrens playground equipment!
    Teach me for going for the cheap option!:Doh:

    Gutted tho I am, thanks for your help Jim, much appreciated.

    Couple of further questions, if i may?

    1. Given that the panel came with "flying leads" in 4mm2, about 750mm long, with MC4 concetors on, should I just "up" my cable size from controllerto panel conector or would it be better to try and get into the control box on the back of the panel and "up" the flying leads dia' as well?

    2. Is it "special" cable or can I use "bog standard" stuff from B&Q (assuming they "do" 10mm2)?

    Ta, and thanks again Jim:thumb:
     
  10. scotjimland

    scotjimland Funster Life Member

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    If not too difficult replace the completed run, panel to controller, controller to batteries with 10mm2..

    Don't fit domestic cable, it's too rigid and not suitable for harsh environments ..

    this is the correct stuff .. single core ..

    H07 RNF Cable 10mm 1-Core per Metre

    £2.40 per Metre
     
  11. Wildman

    Wildman Read Only Funster

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    the readable output from a solar panel depends on the state of charge of the batteries, if you really want to see what they could be producing rather than what the regulator has cut it down to put a heavy load on the batteries. Then read the charge rate. you might be surprised. at this time of the year the sun is low in the sky better results can be got by putting the panel almost vertical and pointed south.
     
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  12. Techno

    Techno Funster Life Member

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    Yes I can recommend that one :thumb:
    I can say I got it for £72 best offer, it arrived in less than a week and it feels like quality being from Taiwan NOT China although Chinese stuff is pretty good mostly.
    [​IMG]

    BTW it was dearer when I bought. If you're going to offer now start at £60 and make sure it is undervalued or a GIFT
     
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  13. wizzer59

    wizzer59 Funster

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    Cheers for that, very helpfull and looks the biz:thumb:, mind you those cables look a thin, you sure they are up to spec:Rofl1::Rofl1:
     
  14. Techno

    Techno Funster Life Member

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    Mmmm Yes could do with changing that now even though it's only half a metre max :Doh:
     
  15. wizzer59

    wizzer59 Funster

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    How do I do that???:Confused:
     
  16. Techno

    Techno Funster Life Member

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    Contact the seller and communicate your fear of import duty and VAT I'm sure they'll be helpful :Wink:
     
  17. wizzer59

    wizzer59 Funster

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    By the way Techno100, Did you have a basic controller before this one? and if so did you find much difference?
     
  18. Techno

    Techno Funster Life Member

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    Yes I had the Juta 20 amp with LCD display but I not only swapped for the MPPT but upped my panels from 140 watt to 200 to maximise it's potential. Since I changed all my lighting to LED it is nigh impossible to put enough load on my batteries to make it reach its capability. Best so far as pictured above on a reasonable day giving 10.3 amps with 22" LG led tv freesat receiver
    350watt pure sine inverter 40 watt netbook on charge and all 20 LED lights on.
    MPPT will perform better than PWM come the winter days
     
  19. Techno

    Techno Funster Life Member

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    Seems a few of these have sold recently :Laughing:
     
  20. zaskar

    zaskar Funster

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    ........and one of 'ems mine!!!!!:BigGrin:
    Thanks for the heads up mate (says he, hoping & praying that it actually arrives!:Rofl1:)
     
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