Robin Miller posted:

Hi HL

Yes good idea, I like to include not discharging my battery to far as well and so as a rule of thumb I consider the useful power of my batteries as only 1/2 their rated.

So as I only run a single 48AH battery this equals only 24AH I count on for general camping purposes.

Robin Miller

V8 Troopie posted:

Quote "it will USE about 2 Ah per hour "

is like saying your car can do 100km per hour per hour.

Ah stands for 'Amp hours', it already has a time factor so it really makes no sense to quote it over time again.

I too noticed the misuse of Ah creeping into these pages, as an electrician it makes me cringe each time I see it used incorrectly.

Its simple, quote battery capacity in Ah, quote current drawn by items connected to it in Amps.

If you make a list of how long each item is connected to the battery, to get an idea what battery capacity is required, then you multiply each individual current drawn by the time its switched on, to get the total Ah the battery has to supply.
Keep im mind that one needs to put back MORE Ah to get the battery back to the stage it was before as there are losses occuring during the charge/ discharge process.
Klaus

hl posted:

Only put the "Hour" there in case you missed the little "h"
cheers

Mainey (WA) posted:

If a 100ah battery is 1/2 discharged is it then 50ah ??

Yes, it is in "numerically" because 50 is half of 100, my maths teacher told me that.

But - not in the amount of "time" it will run a 'fridge'
as the initial discharge "time" is very slow when compared to the available "time" at the end of the discharge cycle, which is much less, due to the lack of power available to draw from.

Another good reason to have a large 'capacity' storage battery system.

ExplorOz Team - David posted:

Sand Man,

Article feedback is actually the best method in these cases as there is an option to send only to ExplorOz however we reckon it is better to post it to the forum also so that a group response can be seen from the forum users when we look at the issue.

We also get copies in email of all article feedbacks. So in a fashion it works the same as Feedback but is targeted directly at the article.

You will be able to tell if a post was started from article feedback by the title in this case Battery Power Feedback, there will also be a link to the article.