NewMar Phase Three PT-24-40, Installation & Operation Manual, Page: 23 / 24

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OWER
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which are not maintenance-free to require topping off about once a month.
A battery’s state of charge may be monitored by checking the specific gravity or by open
circuit voltage. You may use the following table to evaluate the condition of your batter-
ies:
Battery Condition Table
Specific Gravity
Measured by
State of
Hydrometer Open Circuit Voltage Discharge @ 80° F
12 Volt System 24 Volt System
1.265 12.6 or more 25.2 or more Fully Charged
1.225 12.4 24.8 25 % Discharged
1.190 12.2 24.4 50 % Discharged
1.155 12.0 24.0 75 % Discharged
1.120 11.7 or less 23.4 or less 100 % Discharged
* Note: Wait at least 5 minutes after charging or discharging before checking specific
gravity or open circuit voltage. The battery’s voltage needs to stabilize in order to get an
accurate reading.
Troubleshooting Your Battery System
If your battery will not accept or hold a charge, one of the following conditions may
exist:
1. A BAD BATTERY . You may have a battery with an open or shorted cell, a battery
without any “life” left. Check by charging the battery until all cells have a specific
gravity of 1.225 or greater at 80° F. If you are unable to obtain 1.225 in each cell,
replace the battery.
2. A BAD BATTERY CHARGER . If the battery open circuit voltage is low and/or the
hydrometer indicates your batteries are low, the battery charger should be providing
current to the batteries. If it is not, check the input fuse and check to see that you have
charging voltage on the output with no battery attached.
Note: You will not get an accu-
rate voltage reading on the output of the charger with no batteries attached. This is
checked merely to ensure that you do not have an open circuit on the output.
The battery charger has a thermal power reduction circuit to protect the charger from
overheating. If you suspect this is the case, refer to the INSTALLATION section for
information about proper charger location.
3. ELECTRICAL LEAKAGE . You may have a previously unsuspected source of current
drain from the battery. To check for a leakage of this sort, disconnect the battery
ground cable and connect an ammeter between the negative battery post and ground. If