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  1. #1
    Join Date
    Apr 2006
    Location
    Caribbean
    Posts
    2,434

    Default Anybody in the Med or Caribbean monitoring battery temperature?

    I recently upgraded one of my Victron MPPTs to a smart solar regulator. We have the bluetooth temperature/voltage sender that links to the regulator. I was a little surprised at the temperatures the batteries get to. Ambient air temperature here is about 30degC so batteries are circa 33-35degC. Now I know this I am running the battery box mechanical ventilation to pull the temperature down. Think I might install a temperature controller to bring the fan on automatically.
    I understand that temperature in the high 30s half the life of every kind of battery so quite keen to do what I can. Any thoughts or advice appreciated.

  2. #2
    Join Date
    Aug 2004
    Location
    Home East Lancashire boat Spain
    Posts
    4,727

    Default Re: Anybody in the Med or Caribbean monitoring battery temperature?

    Quote Originally Posted by geem View Post
    I recently upgraded one of my Victron MPPTs to a smart solar regulator. We have the bluetooth temperature/voltage sender that links to the regulator. I was a little surprised at the temperatures the batteries get to. Ambient air temperature here is about 30degC so batteries are circa 33-35degC. Now I know this I am running the battery box mechanical ventilation to pull the temperature down. Think I might install a temperature controller to bring the fan on automatically.
    I understand that temperature in the high 30s half the life of every kind of battery so quite keen to do what I can. Any thoughts or advice appreciated.
    Blimey !! if that's the case then worth investigating and taking action I have a non contact thermometer so may take it on board to see what temperatures mine are getting up to.

  3. #3
    Join Date
    Jun 2013
    Location
    Hopefully somewhere warm
    Posts
    9,747

    Default Re: Anybody in the Med or Caribbean monitoring battery temperature?

    Not monitoring yet but new battery box getting built which will have temperature logging of the trojans & voltage of each one, Fans going in but now you've mentioned that might have a pull from the bilges then exhaust overboard somehow. Then log and graph it all on the raspberry Pi.
    Batts don't like it hot...

  4. #4
    Join Date
    Jul 2006
    Location
    Emsworth Hants
    Posts
    12,639

    Default Re: Anybody in the Med or Caribbean monitoring battery temperature?

    In the north Caribbean temperatures are often 35C and we had no problems wuth our batteries, Trojan and CCA.

  5. #5
    Join Date
    Apr 2018
    Location
    Mooring, Faro
    Posts
    1,867

    Default Re: Anybody in the Med or Caribbean monitoring battery temperature?

    Quote Originally Posted by geem View Post
    I understand that temperature in the high 30s half the life of every kind of battery so quite keen to do what I can. Any thoughts or advice appreciated.
    As we had 36 degrees below decks for a few days this summer, I guess it didn't do our batteries much good and doubt a fan would have done much to cool them.

  6. #6
    Join Date
    Jun 2013
    Location
    Hopefully somewhere warm
    Posts
    9,747

    Default Re: Anybody in the Med or Caribbean monitoring battery temperature?

    Quote Originally Posted by Graham376 View Post
    As we had 36 degrees below decks for a few days this summer, I guess it didn't do our batteries much good and doubt a fan would have done much to cool them.
    Tropics water temp was usually around 28C so maybe some air from the bilges might help..

  7. #7
    Join Date
    Apr 2006
    Location
    Caribbean
    Posts
    2,434

    Default Re: Anybody in the Med or Caribbean monitoring battery temperature?

    Quote Originally Posted by GHA View Post
    Tropics water temp was usually around 28C so maybe some air from the bilges might help..
    Sea temperature here is 30degC. Even 100 ft down whilst diving its 30degC!!

  8. #8
    Join Date
    Jun 2013
    Location
    Hopefully somewhere warm
    Posts
    9,747

    Default Re: Anybody in the Med or Caribbean monitoring battery temperature?

    Might be of slight interest..
    https://www.dcvelocity.com/articles/...ast-charging-/
    Sounds like they go for 5% tail current as charged, I'm much lower than that though takes a while longer.
    So with heat being a big factor in battery death it might even be worth fitting a heftyish fan with run speed temperature controlled. Not actially that hard if you've a pi running signalk.
    Last edited by GHA; 06-10-19 at 18:39.

  9. #9
    Join Date
    Aug 2002
    Location
    Gone Sailing -on the move exploring SE Asia
    Posts
    1,829

    Default Re: Anybody in the Med or Caribbean monitoring battery temperature?

    Quote Originally Posted by geem View Post
    Sea temperature here is 30degC. Even 100 ft down whilst diving its 30degC!!
    Here is South East Asia the sea temperature is usually 32 deg and can get to 35 deg on a sunny day. Right now early. Morning is a seeing 33 deg and the sun is not. Up yet.
    Temptress of Down
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  10. #10
    Join Date
    Apr 2006
    Location
    Caribbean
    Posts
    2,434

    Default Re: Anybody in the Med or Caribbean monitoring battery temperature?

    Quote Originally Posted by temptress View Post
    Here is South East Asia the sea temperature is usually 32 deg and can get to 35 deg on a sunny day. Right now early. Morning is a seeing 33 deg and the sun is not. Up yet.
    From what I can find doing some research we are halving the battery life continually running batteries at circa 30/35degC compared with them being at circa 20/25 degC. Not great.

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