Can you over solar

Discussion in 'Solar Power' started by chaser, Apr 3, 2016.

  1. chaser

    chaser Funster

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    If anyone saw my post in another thread, I have now got two 100w panels , one free, now, I have two 85 ah battery's, and fixed the one panel on the roof and over a long weekend could no where use all my electric, so I have another panel lieing about now, tried it loose on the roof yesterday and it seems to do the same as the other, now thinking of putting it on as well, but do I need it , will it be any benifit or will it fry my battery's and just be a bit more weight to lug about.:(
     
  2. tonyidle

    tonyidle Funster

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    You can never have 'too many' solar panels. As long as they are connected via a regulator or regulators they cannot harm the battery(s). More panels means you get more help on dull days.:)
     
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  3. Techno

    Techno Funster Life Member

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    You can exceed your weight limit :LOL:
     
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  4. SuperMike

    SuperMike Read Only Funster

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    We have 400w fixed flat on the roof. I was always very sceptical about their use in this country, and voiced such many times, but now I am converted. RV's tend to be a bit 12v hungry, but we left home last Friday week and have not used the power supply yet. I know the weather has been a bit decent the last few days, but my big old battery bank was back up to 100%, by noon today and Managements medical kit has a decent draw. The biggest thing though has to be the lights. Conversion from halogen or tungsten to led is a must. With every light on, and there are a few, I draw just 1A. (y)
     
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  5. JJ

    JJ Funster

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    Solar Panels are like cold beers in the fridge...

    There is no such thing as "too many".

    JJ :cool:
     
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  6. Robert Clark

    Robert Clark Funster Life Member

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    Sounds OK in theory
    Providing you've got a suitably sized fridge
    image.jpeg
     
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  7. JJ

    JJ Funster

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    Errrrrr...

    I don't think that is a real fridge...

    JJ :cool:
     
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  8. Robert Clark

    Robert Clark Funster Life Member

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    This one is - it says so on the number plate
    image.jpeg
     
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  9. John Laidler

    John Laidler Funster

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    You wont fry your batteries if the controller is working correctly as it will limit the charging current. As for weight, the 100W panel I fitted recently weighed 9 Kg which is nothing really.
     
  10. Allanm

    Allanm Funster

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    We left our van in France while we brought our car back for an MOT and new clutch and to get stocked up with tools and bits for the house. First time we have left the van on its own with no EHU while we aren't using it. We have 3 leisure batteries ( 110ah each) and 110 watts of solar.
    Its been there for 3 weeks now and batteries are reporting 100% when I text the alarms.
    It must be nice and sunny in Brittany!
     
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  11. Reallyretired

    Reallyretired Funster

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    I think a balance can be struck. I have 400w solar but only 250Ah of battery, fine when its not very sunny but in the summer I can't use a lot of what is produced as the batteries are always 100%. I do use an electric kettle to use a bit and save gas but I could probably benefit from another battery, but nowhere to put one.
     
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  12. steevie

    steevie Funster

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    If you arent flattening your batteries regularly, then you dont need anymore battery power. sounds like you are fine as you are.
     
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  13. Lenny HB

    Lenny HB Funster

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    Never have too many, been in Portugal & Spain for the last 2 months with crystal clear blue skys wall to wall sunshine the most I've had out of my 2 x 100 watt panels is 95 watts at this time of year.
     
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  14. Ranger

    Ranger Funster

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    So if your solar panels are producing many amps of power but the batteries are already full where does it all go, just asking?:rolleyes:
     
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  15. funflair

    funflair Funster Life Member

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    Basically it doesn't go anywhere as the controller disconnects, if you want to use the solar that wont fit into the already full batteries you can fit a Votronic AES (Automatic Energy Selection) solar controller that will switch an AES fridge from gas to 12 volts and use the "spare solar" running your fridge.

    To answer the original question "can you over solar" I would say yes but only if you have that much that your maximum charge current exceeds the maximum charge rate of your batteries.

    Pinched fro Mastervolt web site,


    The charge current
    A rule of thumb for gel and AGM batteries states that the minimum charge current should be 15 to 25% of the battery capacity. Connected equipment usually also needs to be powered during charging, so include the power used for that purpose in the abovementioned figure. This means that, with a battery set of 400 Ah and a connected load of 10 amps, battery charger capacity has to be between 70 and 90 amps in order to charge the battery in reasonable time.

    The maximum charge current is 50% for a gel battery and 30% for an AGM battery. For a Lithium Ion battery the charge current can be the same as the capacity. A 180 Ah Lithium Ion battery, for example, can be recharged with 180 amps.
     
    Last edited: Apr 4, 2016
  16. Geo

    Geo Trader - Funster

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    Can I just say that all these people are talking absolute Tosh, except JJ's beer comment of course.
    Safe did someone say SAFE!!!!!!
    Oversolaring ( See its so Dangerous it's even got its own word) is one of "The" most Dangerous things a Motor Homer can do!!!!!!! BUT
    as a gesture of good will, give the panel to me, Il'l pay the postage and I will put it next to my existing panel
    and give you yearly updates on the dangers you have avoided
    These forums are good arn't they and it's what friends are for(y)
    Geo
     
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  17. vin0114

    vin0114 Funster

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    'course it is its got bottles in it:D
     
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