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Wiring scheme
1) Install WRM20 in a dry and adequately ventilated place; it has to be fixed on a non-flammable surface and placed so
to leave unobstructed space of at least 10cm around the device that allows the cooling by natural air convection.
2) Proceed with the connection in the following order: load, PV module and battery switch, as shown in Pic.2 scheme.
When you connect the battery, the regulator turns on and it begins to work. Use a proper cable section as indicated in
Pic.2.
3) WRM20 recognizes automatically the battery nominal voltage and adjusts consequently its working thresholds. The
user can set battery charge voltage (V
use VRLM or GEL sealed batteries, while you have to choose the FLOOD configuration if you use flooded lead acid
batteries (Tab.2).
4) Set the proper load management program to your own application (Tab.2).
System testing
Once made the connections as in Pic.2 it i
1) With the PV module exposed to sunrays, verify that WRM20 is charging the battery reading on the recharge current
I
e I
(see Tab.1).
PV
BAT
2) To verify that the battery temperature sensor has been properly connected check on the LCD that at the page
atter te perature a relia le te perature alue is displa ed see Tab.1).
3) Verify the correct turning on of the load. If the load is ON only during the night it is possible to simulate the night by
disconnecting temporarily one of the wires of the PV module. With load ON check the absorbed current by reading in
the proper page of the LCD (Tab.1).
Downloaded from
www.Manualslib.com
) according to the type of battery. You have to set the SEAL configuration if you
ch
necessary to proceed with the testing of the system.
s
manuals search engine
WRM20 and WRM20+
User manual
*WBus connection is available
only in model WRM20+
CAUTION Do not connect loads
more than 20A as inverters.
Pic.2 Connection scheme
4
EN
Copper wire section recommended
for 1.5% maximum voltage drop.
12V battery voltage
2
Wire section [mm
]
2.5
4
6
10
2
2
2
2
mm
mm
mm
mm
2.6
4.2
6.3
10.4
5 A
10 A
1.3
2.1
3.1
5.2
20 A
0.6
1.0
1.5
2.6
24V battery voltage
2
Wire section [mm
]
2.5
4
6
10
2
2
2
2
mm
mm
mm
mm
5.2
8.4
12.5
20.9
5 A
10 A
2.6
4.2
6.3
10.4
20 A
1.3
2.1
3.1
5.2
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