Bedienungsanleitung Mastervolt Solar ChargeMaster SCM20 PWM (Seite 10 von 16) (Englisch)

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10 EN / SCM20 & SCM40 PWM User’s Manual

3.4 SPECIFICATIONS OF THE PV ARRAY

WARNING

When the PV array is exposed to light, it

supplies a DC voltage to the Solar

Chargemaster which can be dangerous to touch.

For this reason, use of an external DC-switch is

strongly recommended. Alternatively, before

attempting any maintenance or cleaning the PV-

array should be protected from light exposure,

e.g. by covering the PV modules.

CAUTION!

Do not connect Solar Chargemasters in parallel

on the side of the PV array.

The Solar ChargeMaster is appropriate for nominal 12V

and 24V solar systems. The table shows the number of

cells required for the nominal voltages.

Battery voltage U

NOM

= 12V

Model Panel type Max input

voltage Max input

current

SCM20 PWM 36 cells 28V 20A

SCM40 PWM 36 cells 28V 40A

Battery voltage U

NOM

= 24V

Model Panel type Max input

voltage Max input

current

SCM20 PWM 72 cells 55V 20A

SCM40 PWM 72 cells 55V 40A

CAUTION!

Never connect voltages higher than specified to

the PV-input, as this will cause permanent

damage to the Solar Chargemaster.

Configuration examples for PV-arrays consisting of

monocrystalline or polycrystalline PV-modules:

3.5 CONNECTION OF LOADS

Depending on the energy system in which the Solar

Chargemaster is used, there are two options to connect the

electrical load to the Solar Chargemaster:

 To the Load output on the Solar Chargemaster, or

 Directly to the battery.

3.5.1 Load connected to the Load output

See Figure 5 for a typical installation diagram. The Load

output is provided with a protection circuit that switches off

the connected load automatically in case of overload or if

the battery voltage is too low. This kind of installation is

typically used when the PV-modules are the only source of

electrical power to charge the battery.

3.5.2 Load connected to the battery

If the maximum load will exceed 20 Amps (SCM20 PWM),

40 Amps (SCM40 PWM) or if the battery will also be

charged by other energy sources, such as a battery

charger or an alternator, the electrical load shall be

connected to the battery directly. See Figure 6 for a typical

installation diagram. In this situation the battery is no longer

protected against too low battery voltages. Installation of

additional undervoltage protection circuits may be

necessary. See section 5.3 for ordering information

3.6 THINGS YOU NEED

Make sure you have all the parts you need to install the

Solar Chargemaster:

 Solar Chargemaster (included);

 Battery temperature sensor with cable and plug

(optional, not included; see section 5.3 for ordering

information);

 DC cables to connect the Solar Chargemaster; see

section 3.3 for specifications;

 DC-fuse holder with a DC-fuse, to be integrated in the

positive DC-cable to the battery; see section 3.3;

 Screws / bolts (Ø 4mm max.) (with plugs) to mount the

Solar Chargemaster to a surface;

 Batteries;

 Appropriate and reliable cable terminals, strain reliefs,

battery terminals and boot lace ferrules.

We recommend as a minimum tool kit:

 Phillips screw driver nr.2 or flat blade screw driver 5

mm to fix the DC-cables;

 Tools to fix the screws / bolts with plugs to mount the

Solar Chargemaster to a surface;

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