Forum Discussion

BFL13's avatar
BFL13
Explorer II
Sep 11, 2019

Some Good Info on Battery Bank Size, Etc

Might be something "new" here and there in this link for folks.

A good read-- scroll down to the Renewable Energy stuff for some tips on how to size your bank for your solar scenario. Like don't have too many batteries.

There is a useful charging profile graph for their AGMs. (Note they use a higher Vabs than some do and that they use a different "end amps" amount) There is also a handy temperature compensation table for those with manual setting adjustable voltage chargers. Note mention to use battery temp, not just ambient.

Also useful on how long to wait to do a refresh charge on a stored battery depending on ambient temp during storage.

Different things of interest throughout, depending on your own situation.

http://www.hespv.ca/hesproductspecs/Stark/Stark_Battery_MSDS_ENG.pdf
  • MEXICOWANDERER's avatar
    MEXICOWANDERER
    Explorer
    Sep 11, 2019
    Every cannibal tribe has a different recipe for "How To Serve Your Fellow Man".

    A miscalculated system leaves your batteries perpetually undercharged.

    A miscalculated system does not have any reserve day-to-day. Results in over-discharging the batteries till next charging session.

    But factor this in. Any type of battery is difficult to charge the last 5%

    Let's use a 100 mp hour group 27 wet battery.

    A single battery may be at 7 amps total the last 5%
    2 of them 14 amps total
    4 of them 28 amps total

    Get the picture? But the charger must be big enough to stuff the batteries during the shortest bad weather solar day. But this is why generators exist.

    I opted for a 28 volt system where THIRTY AMPS means FLOATING the batteries. 700 amps means a saturated charge. Get the picture. Lithium? Anyone want to donate thirty grand then new chargers to upgrade my batteries? :)

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,189 PostsLatest Activity: Jan 18, 2025