Hi Brad,
When the voltage drops like that, you are definitely dealing with an increase in resistance. It could be loose connections, but at 6 years old, it more likely internal resistance inside the batteries. New batteries will likely cure your problems.
Pat
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
Sent: Monday, August 25, 2014 11:24 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Voltage drop underway
Hi everyone,
I have an electric yacht motor, driven by 8 Trojan T105 batteries, wired in series to produce 48Vdc. I have owned the system and the batteries for 6 years. I have noticed this year that I am getting really significant voltage drops while underway.
I can see the motor controller display going from 48 down to 24 Vdc, all within an hour, under what I consider to be normal cruising conditions and amp draw.
I guess there may be two problems.
1) A resistance problem- maybe thermally induced ( but I don't think so)
2) The lead acid batteries are crapping out on me.
Has anyone had this experience? What should I do to determine if the batteries are due for replacement?
please advise, Brad
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