Monday, August 25, 2014

[Electric Boats] Re: Voltage drop underway

 

What they said. But one more thing... If your charger can give an equalizing charge, try that. See this link http://www.trojanbattery.com/BatteryMaintenance/Equalizing.aspx You need to be able to deliver 62 volts for a proper equalizing charge for a 48v bank. Alternately you can charge them separately and this might be better. One old timer trick is to vigorously shake or agitate the battery after high current bulk charging. Proper protective gear of course. If only one battery is bad, it may be worth your while to replace just the one for a season or two and figure on replacing the whole bank when the next one craps out. But 6 years is a normal life and if one is bad, the rest will soon follow, most likely. If you have two fairly good ones, you could keep them for a dedicated backup bilge pump bank, with its own solar charging. That way you have a totally redundant and separate system for dewatering in the event your primary system does not automatically pump the boat out for some reason. Yeah, you could have a bad connection or bad wire, and that is a good thing to check first since it is a quick and cheap fix, but when all is said and done I would bet a dollar to a donut you have at least one battery with high internal resistance. Try to bring it back, but remember you will soon be replacing them anyway so don't sweat it if they just won't cooperate. If you really rely on your motor you might consider a secondary bank, maybe 4 group 31s or even smaller, just enough to get you into your slip. Then if your primary bank just quits, good to go.

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