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Old 05-08-2016, 18:35   #166
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Re: Batteries And 12vdc Systems

Hi all,
Inverter is in...almost in. Turned out to be easier than I feared but am now stuck over what should be obvious.
Where the heck is the DC negative buss?
Surely there is one. I traced the inverter negative lead back and it appears to go direct to the left (port) side of the buss that connects the 3 house batts. Then there is a tap off the center bat for the Espar heater ( gurr) and a third hefty cable off the right side batt. Positive is similar
I must be missing something because I can't find the mystery location for where the charger neg lead ties into the system. It's got to be right in front of my face but I'm hanged if I can see it.
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Old 06-08-2016, 04:43   #167
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Re: Batteries And 12vdc Systems

Rufduck,
I guess you do not have a battery monitor which shows used ampere hours. Since if you have a battery monitor, the negative terminal of the battery may only be connected to the shunt, and all loads and chargers should be connected to the other terminal of the shunt.

If I remember correctly, in the non-evolution Mahé, one of the big M8 screws on the starboard side of the battery box is the negative/ground connection. But I sold our mahé more than 2 years ago.

Just keep on checking, every hours spent investigating is useful in the long run. Better than watching TV.
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Old 13-09-2016, 10:22   #168
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Re: Batteries And 12vdc Systems

Greetings,
I've read this thread top to bottom and if it's there, I missed it.
Short of a battery condition monitor, and short of applying a known hefty load to the batts and measuring the time to reach 11.7 volts, is there a way to determine the health of the bank batts?
Martyn
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Old 14-09-2016, 11:09   #169
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Battery Load Tester

Rufduck,

You can buy a Battery Load Tester to test you battery bank.

This is the device that a marine surveyor would use to test a boats batteries
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