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Post Info TOPIC: 75 AH battery
Stewart


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75 AH battery
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Hi on a rescent trip away with a non powered site my second battery box lost charge running the Waeco fridge outside, and due to torrential rain and cloudy days I had to concentrate my solar to the main caravan battery. My battery box has the replaced 100AH calcium battery in it and when charged only sits at about 12.6 volts. So I'm not sure it's that healthy. My thought are I could replace it with a 75AH which would be lighter and able to recharge quicker. Do you think this is a sensible option or is 75AH too light. It's the old problem of recharging not storage. Or maybe not use the battery box at all and leave it at home. I do have a dcdc in the van for when travelling. Cheers Stewart

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Whenarewethere


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75Ah is perfectly ok if it can power your fridge (whatever model it is) over the timeframe you are happy with.

I have four 26Ah batteries. I started with two, then three, then four. Four Batteries suck up anything you give them.

 

You could have 2 batteries so they are easier to move, or a cable to the fridge.

 

I also made my fridge more efficient so it saves buying more AH, technically 7 days off my setup. Foam is a lot lighter than battery.

https://thegreynomads.activeboard.com/t65059593/extra-fridge-insulation-wattage-test/

 

Running the engine to charge up the batteries a bit is the simplest solution if you have extended inclement weather. One probably doesn't need to do this that often over a year.



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PeterD


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Calcium batteries are capable of charging quickly if you use the correct charger voltage. What is the absorption voltage of your charger? Also if you are attempting to recharge the battery from your tugs alternator then you will not get a rapid charge unless your tug is equipped with a calcium battery.

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Stewart


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Hi my charger at home has a calcium setting and I have seen the voltage go to 14.8. During charging. It could be ok it still shows a green indicator cell. Unfortunately the date has not been marked on the top so I'm not sure of its age. I think it's 4 years old. I use a 200 w solar blanket with pwm charger when away for the battery box. Cheers Stewart

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Whenarewethere


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There will be a WWYY (week year, ie 2617) stamped into the case somewhere.



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PeterD


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Stewart wrote:

I use a 200 w solar blanket with pwm charger when away for the battery box. Cheers Stewart

 Does that PWM controller have a calcium setting with similar settings to the other charger? If not then get a new controller for the calcium battery. That will then make your calcium battery a better proposition than the smaller capacity one.



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PeterD
Nissan Navara D23 diesel auto, Spaceland pop-top
Retired radio and electronics technician.
NSW Central Coast.

 
Stewart


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Hi This is the top of my Calcium battery

and the only numbers i can find on it

If you can help with its age would be a great help

Cheers Stewart



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Whenarewethere


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I can't make sense of those numbers.

An old battery top right corner of photo 1813 week18 year13.

2093690807646470455.jpg



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Procrastination, mankind's greatest labour saving device!

50L custom fuel rack 6x20W 100/20mppt 4x26Ah gel 28L super insulated fridge TPMS 3 ARB compressors heatsink fan cooled 4L tank aftercooler Air/water OCD cleaning 4 stage car acoustic insulation.
gdayjr


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I am not sure that is the age of the battery.

 

Have a look here for some very usefull info on Batteries.

I sold this brand for quiet a few years while running big tyre stores.

 

https://www.centurybatteries.com.au/content/documents/cars/cb101-1200b-century-selection-guide-low-res.pdf

 

 

 

 



-- Edited by gdayjr on Wednesday 12th of May 2021 08:48:58 AM

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