Wanderer Motorhome Page 17

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Control Panel Voltmeter
See Page 8 for Control panel drawing

New Voltmeter	New Voltmeter in Position
Battery in different charge states. Avoid discharging the battery below the 40% level whenever possible. See Mark S. Nemeth site: http://www.ccis.com/home/mnemeth/12volt/12volt.htm Who has allowed a down load of this information.

The Control Panel in the Wanderer does not have a panel voltage meter, just LED's for high and low indication to monitor the leisure battery.      When the LED for 'Low' is displayed it's too late! So a meter was purchased from my local caravan dealer and fitted to the ZIG panel position. This had switch control.          The advantage of a switched controlled volt meter is; It is now possible to monitor the Van and leisure batteries before turning on the voltages to the system. When the system is turned on, at the control panel, it is possible to monitor the voltage drop and this will give an indication of the charged condition, of the batteries.       A battery always gives a higher voltage when not connected, than when connected and a load is taken from it. So if monitored over a period of time the battery condition can be assessed. For example; Off load the battery will indicate 13.8 volts, on load the voltage will drop to 12.6volts, if this drops to 10.6 then it's possible you have a defective cell, i.e. 12.6 -  10.6 = 2volts lost from the defective cell.      It can be checked over time for indicating the battery's loss of capacity, this is shown as a progressive lowering of the voltage on load. Once the battery,on load, shows a voltage of about 11.8volts after a couple of years,  then it's time to buy a new one.     'Load' definition;       When the battery is supplying volts to the caravan interior.

Schematic and drawing of voltmeter installation.

http://www.ccis.com/home/mnemeth/12volt/12volt.htm

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