Canal Boat - - Engine & Gearbox Directory -

Tech­ni­cal Con­sul­tant NOW THAT THE main cruis­ing sea­son has started I have been hear­ing about prob­lems with batteries and charg­ing regimes. In far too many cases it comes down to not charg­ing for long enough, leav­ing the batteries par­tially charged, and then be­liev­ing the state of charge shown by amp-hour count­ing gauges.

Such gauges ac­cu­rately count the amp hours flow­ing into or out of the batteries but they can only guess at how many of those amp hours are con­verted to stored elec­tric­ity – and they have no idea how much bat­tery ca­pac­ity is lost as batteries age. Over time this leads to gauges over­stat­ing the state of charge, so charg­ing is stopped long be­fore it ought to be.

So make sure you read the gauge’s in­struc­tions, set it up prop­erly and reg­u­larly re-syn­chro­nise it. When charg­ing, use the ‘amps’ func­tion and keep go­ing un­til the charg­ing cur­rent has dropped to about one per­cent of the bat­tery ca­pac­ity.

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