Battery condition (1 Viewer)

[newboy]

Hi
I've had my motorhome for 3 years and always been able to use a hook-up when not in use. Unfortunately I do not have hook-up at my new storage.

My question is I have 2 x 90amp/hr leisure batteries and I am using 0.25 volts per week.(started 13 volts, 3 weeks later 12.25volts), can anybody tell me:

A.How many watts I am using per hr/week ?
B.How long the batteries will last before needing charging ?

Reason for question. Thinking of fitting a 100watt solar panel.

Thanks in anticipation

 

[pappajohn]

at 12.25v your batteries are almost technically flat.

Difficult working out a wattage from a voltage but working on 12.7v being fully charged, 12.2v being flat and combined amperage of 180 i would estimate you have used around 90 amps or approx 1000watts.

50% discharged is considered flat

Doesnt seem correct for a battery in storage though....are your batteries in good condition as the only thing i can think is your batteries are on their way out.

Edit....

Just done a quick calc and if i got it right its only 2watts or 166milliamps per hour drain or just under 4 amps per day over 3 weeks.

Is there an LED light left on somewhere ?

 

[Roryboys Dad]

Love your batteries?


Then they'll love a Solar Panel.


Even this time of year – dull, cloudy, raining – the batteries will get some charge going into them.


And in better weather …......

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