Bat­tery ages

Practical Boat Owner - - Letters -

I read the Colin Haines let­ter (PBO June 2018) with in­ter­est. It seems to me the root cause of his prob­lem­atic bat­tery bank is spelled out in the let­ter.

He says: ‘My bat­tery bank is rated at 305Ah ca­pac­ity and the in­di­vid­ual ages of the bat­ter­ies vary be­tween 7 and nine years old’.

It is the dif­fer­ent age of the in­di­vid­ual bat­ter­ies that is the cause of the prob­lem.

When you cre­ate a do­mes­tic bat­tery bank by wiring bat­ter­ies in par­al­lel it is vi­tal that the bat­ter­ies are as ex­actly the same as they pos­si­bly can be. You are, in ef­fect, cre­at­ing one big bat­tery and if the bat­ter­ies are in any way dif­fer­ent then some of them will over­charge and oth­ers un­der charge.

Bat­ter­ies age and over time they be­come elec­tri­cally dif­fer­ent from a new one.

When cre­at­ing a do­mes­tic bank all of the bat­ter­ies need to be the same make, type, rat­ing and age. Ideally they should be from the same pro­duc­tion batch.

It’s a good idea to fully charge each of the new bat­ter­ies in­di­vid­u­ally be­fore cre­at­ing the bank.

The link ca­bles be­tween them should all be of the same length and you should only ever con­nect to the pos­i­tive at one end of the bank and the neg­a­tive at the other end of the bank. Do the job prop­erly, pay­ing care­ful at­ten­tion to con­nec­tions, and pro­tect them from cor­ro­sion.

Do it right and your in­vest­ment will be re­warded by re­li­a­bil­ity and longevity. Ian Loffha­gen Row­lands Ma­rine Elec­tron­ics

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