SJ-Chris wrote:
pianotuna wrote:
SJ-Chris wrote:
I believe all the batteries are about 14 months old. To me, that makes them relatively newish. Assuming they are all in good health, I'm willing to add a 3rd battery which is brand new (same manufacturer/size/etc).
-Chris
Please at least wire the new batteries in a balanced manner. Method #3 is the only way to do so for odd numbers of jars.
http://www.smartgauge.co.uk/batt_con.html
I suggest adding some plywood to the compartment you are going to use--and if all 3 batteries will fit there it would be better.
I am happy to say I am using Method #3.
Are you sure? Method 3 requires equal amps and voltage from all 3 batteries. How are you doing this with one battery located 8' away?
A 900W MW draws 65A+ and not the best for starting batteries which a Marine battery is - ie a compromised starting battery. Might be OK and might cause a low voltage fault.
50% SOC batteries start charging in bulk and ramp up to absorb with about 14.4V and certainly are drawing more than a few amps. They stay there until the absorb stage starts to taper amps.
Any old charger and any wiring situation will eventually get the batteries charges. But there are cons including longer charging, shorter life and lower voltage under load. What you are doing may work for you. Sometimes it's try it, see and learn.
