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Thread: Battery Life ?

  1. #1

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    question Battery Life ?



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    Hi Everyone
    We just got back from a trip and tried running the fridge off the battery 100 ah ,it run flat on the first night we had another so no problem but has anyone tried a solar panel to recharge the battery or run the fridge .
    Any advice please.

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    Solar panels in themselves will not run a fridge,they will have to charge a battery in day light which in turn powers a fridge,but fridges should only run on 12v when running the engine & gas when at camp or mains on a site unless its a compressor type.
    You would require a good bank of batteries to power a fridge from low light through night untill daylight next day.
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    Quote Originally Posted by trevskoda View Post
    Solar panels in themselves will not run a fridge,they will have to charge a battery in day light which in turn powers a fridge,but fridges should only run on 12v when running the engine & gas when at camp or mains on a site unless its a compressor type.
    You would require a good bank of batteries to power a fridge from low light through night untill daylight next day.
    Thank you trevskoda.
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    No substitute for a variable speed compressor type IMHO unless you want to run on gas.
    I swapped our 3 way absorption type last year for a Waeco variable 12v compressor type and haven't looked back.
    Ours is left running all the time and draws less than an amp from our 3 x 100ah leisure batteries AND then only when it's actually running.

    Not cheap BUT very worthwhile.
    Likes - Edina, trevskoda, Robmac, Fletch6 liked this post

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    Quote Originally Posted by mistericeman View Post
    No substitute for a variable speed compressor type IMHO unless you want to run on gas.
    I swapped our 3 way absorption type last year for a Waeco variable 12v compressor type and haven't looked back.
    Ours is left running all the time and draws less than an amp from our 3 x 100ah leisure batteries AND then only when it's actually running.

    Not cheap BUT very worthwhile.
    I'll second that; left our Waeco on through the winter months, on our drive when not using the van, solar powered it easily.
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    Quote Originally Posted by Edina View Post
    I'll second that; left our Waeco on through the winter months, on our drive when not using the van, solar powered it easily.
    Thank you Mistericeman and Edina
    Might be a solution for next winter when it's home more than away.

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    Another vote for the waeco compressor fridge.

    Split charger (charging the batteries when you drive) and solar panels (charging the batteries when it's sunny) do a fine job of keeping things going pretty much forever.

    All down to figuring out your power needs and working back from that to size your batteries, panels, etc
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    Quote Originally Posted by hextal View Post
    Another vote for the waeco compressor fridge.

    Split charger (charging the batteries when you drive) and solar panels (charging the batteries when it's sunny) do a fine job of keeping things going pretty much forever.

    All down to figuring out your power needs and working back from that to size your batteries, panels, etc
    Thank you Hextal

  9. #9

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    Quote Originally Posted by Philipglyn View Post
    Hi Everyone
    We just got back from a trip and tried running the fridge off the battery 100 ah ,it run flat on the first night we had another so no problem but has anyone tried a solar panel to recharge the battery or run the fridge .
    Any advice please.
    Three way fridges work by heating a fluid. They can run on any source of power but are not specially efficient, and are NOT suitable for running off a 12v supply unless the engine is running. They draw about 8 amps, which is enough to use all the available capacity of a fully-charged 100AH battery in seven and a half hours.

    The next sort is the heat pumps used in coolboxes. They take about 4A so a 100AH battery would last about fifteen hours.

    12v compressor fridges use a sort of miniature version of a domestic fridge mechanism, with electronic controls to make them more efficient. One of them would last a day and a half or more before running the battery down.

    So if you have a biggish solar panel, a mains hookup or move on regularly, driving for several hours at least every other day, you will be fine with a compressor fridge.

    If not, you really do need a fridge that runs on gas.
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    Quote Originally Posted by hairydog View Post
    Three way fridges work by heating a fluid. They can run on any source of power but are not specially efficient, and are NOT suitable for running off a 12v supply unless the engine is running. They draw about 8 amps, which is enough to use all the available capacity of a fully-charged 100AH battery in seven and a half hours.

    The next sort is the heat pumps used in coolboxes. They take about 4A so a 100AH battery would last about fifteen hours.

    12v compressor fridges use a sort of miniature version of a domestic fridge mechanism, with electronic controls to make them more efficient. One of them would last a day and a half or more before running the battery down.

    So if you have a biggish solar panel, a mains hookup or move on regularly, driving for several hours at least every other day, you will be fine with a compressor fridge.

    If not, you really do need a fridge that runs on gas.
    A Waeco 50 compresser fridge uses c 4 ah per hour when running
    Averaged over 24 hours(its not running most of time) it will use c 1.5 ah per hour (depending how hot it is)
    So it will use c 30 ah per day plus. 150 watts of solar panels will probably supply c 40-50 ah per day in summer in uk. (my figures are from experience not sales brochures) Alllowing for other energy uses you might get away with 150 watts of solar , though 200 would give you a better margin. In winter forget it. In S Europe no problem.
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