TM-2030 Technical Manual
5
b. Then connect the SIG wire to the other Kelvin “battery side” terminal (closest to the minus battery
connection.)
c. Connect the wire for the +B1 connection to one side of the one amp fuse holder. Don’t yet put in the fuse.
d. A wire from the other side of the fuse holder must connect to the + terminal of the main battery set. We
suggest connecting it directly to the + battery terminals so that the meter will operate even if a main
breaker is turned off.
e. Then, if you are measuring a secondary battery use a second fuse to connect the secondary battery +
terminal to its +B2 wire.
STEP 5: Connecting wires to meter: Check that the fuse holders installed in STEP 4B still have their fuses
removed.
TM-2030-RV only: Take the meter out of its box by removing 4 screws. Drill a hole in the plastic box in a
desired location and size to allow the cable or wires to enter the box. Thread the wires through the hole.
TM-2030-A only: The panel can mount in a suitably sized “double gang” electrical box that is mounted 90
degrees from its usual orientation on the wall. Thread the wires through a suitable hole in the box.
The meter circuit board has a 5 pin terminal block on the rear. The five connections are labeled: G1, G2, SIG and
+B1 and +B2. Strip insulation off each wire 1/4 inch or so.
STEP 6: Use a small screwdriver to loosen the screws on the connector and insert each wire in a separate
connector hole using the chart above and/or wiring diagram (Figure 2) to determine which wire goes to which
terminal, and tighten each screw to hold the wires securely, taking care that there is no danger of shorts
between the wires.
Make a final check of the wiring. Install meter in box and finally insert the 1A fuse(s) in the battery fuse
holder(s). Digits should light up on the meter. If fuse blows, wiring is probably wrong: before
replacing fuse: carefully check that B1+ wire from battery and fuse goes to proper “B1+” terminal on the
meter. (See wiring, Figure 2)
If you installed the more common 500A/50mV shunt, proceed to next step 7. If you used the 100A/100mV
shunt, see section C2 below: “How to program your meter for the 100A/100mV shunt”
STEP 7: Here’s how to check that you’ve probably wired you meter and shunt properly:
1. Push “SELECT” to illuminate the front panel light: B1 VOLTS. The battery volts should display.
2. Push SELECT to show AMPS. Turn all charging sources and all loads off, with the inverter completely off (not
even in “standby”). The meter “amps” display should show near 0. (0.0 to 0.1 amps if using the 500A/50mV
shunt. If using the 100A/100mV shunt minus 0.03-0.05 amps which is the current used by the TM2030 itself )
3. Turn on a known load of over 20 watts. (One or more lights, for example,.) This should cause the “AMPS”
reading to become more negative. The “amp” value should be about equal to the watts divided by 12 for a
12V system plus a little more for the inverter power. (20÷12 = 1.8 amps) Divide by 24 for a 24V system.
4. Check AMPS charging from every charging source. As you turn each charging source on (solar, alternator,
battery charger, etc) be sure that for each source the amps become more positive by about the amount you
would expect from that source.
STEP 8 FINAL STEP: program two important program values for your system. This is necessary to
make the “% full” display work correctly::
1. Hold the SELECT button down, and when “P1” appears in the display, release the button. If you
miss it, just hold it down again until you succeed. The display will show the “Charged voltage
setting”, alternating with “P1”
2. Momentarily push BOTH SELECT and RESET at the same time—to get the three green lights
on the meter to flash on and off. Now you can change the number.
3. For a 12V system enter 14.3 volts. For a 24V system enter 28.6 volts or 48V system 57.2. Push
the RESET button to make the number go up. To make numbers go DOWN you must go all the
way to 65.0—then it will jump to 10.0 and go up again.
4. Next Push SELECT a few times to show “P3.” This will display “battery capacity.”