amberroot 0B2 Manuale d'uso - Pagina 7

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4.2.2 Parallel connection of Solar PV string

To get the required charging power, 2 or more strings are usually to be connected in

parallel. Each string connected in parallel must be composed by the same number of

modules of the same type.

The number of strings connected in parallel

depends on the Isc of each string. The Isc of the

array must be < 30A for REhub MPPT, 40A

Version. When you need to determine the Isc of

the parallel array, it is the Isc of each panel

multiplied by the number of parallel strings. For

example, if the Isc of the panels used in the

system is 4A. The maximum number of Parallel

strings → 30A/4A =7.5: Round down to the lower

value → 7 Parallel strings.

The total power of the array can be slightly higher

than rated power of REhub. This excess capacity

is designed in to get the desired charging power

under all

circumstances of Solar radiation.

However, the output current from REhub will be

limited to the maximum rated current. (This is

40A in REhub-12/24-40 models)

4.3 Cable Size

Based on Array arrangement, calculate INPUT

current. Choose the appropriate cable size for

INPUT current based on the length of the cable

from the PV panels to REhub. REhub must be

located close to the Batteries. Connect the PV

+Ve to Terminal [2] and connect PV -Ve to

Terminal [1].

4.4 Battery Connection

REhub monitors the net current delivered to the

Batteries. REhub is by default configured to

allow a maximum of 18A net current into the

batteries. What this means is that the sum of the

negative currents (currents drawn by the loads)

and the positive currents (currents delivered by

Solar PV and Inverter) will be not more than 18A.

This is ideal for Battery size of 150Ah – typical

home back up Batteries. This value can be

changed

through

available

for

purchase).

connections

the

Connections [2] and [4] deliver the Solar charge

to the batteries. Connections [3] is to monitor the

battery currents. The existing Inverter battery -

Ve connection to battery must be disconnected

and connected to REhub terminal [3]. Keep the

Inverter in switched off / Away mode till you are

ready with all connections. Do not close the

Battery connections till you are ready for POWER

UP.

Amberlink.

(separately

There

are

batteries

from

REhub.

Ver 7.0

Check to make sure LINE &

Neutral are NOT Swapped

Sometimes the LINE and Neutral is

swapped between the Input wire of the

Inverter and the Output Load socket.

Even with the swap prior to the

installation of REhub, the problem is

not seen because the Inverter delivers

output from the batteries only when

the Mains are not available. So, a Line-

Neutral swap from input to output is

not noticed

However when the Inverter's Mains

input is connected to REhub with the

LINE – Neutral swapped between AC

input and output Load and when

REhub forcibly switches off the MAINS

input to the Inverter (even when

MAINS power is available in the

daytime when Solar is available), the

Output Load may get dangerously

high voltage, because the Inverter is

delivering output from the Batteries

and the MAINS is also available.

Sometimes,

connected to the Live input of REhub.

REhub operates by switching off the

Mains input to the Inverter. This

operation will not happen if the

Neutral is connected to the Live input

of REhub because the relay then is

two

switching ON or OFF the Neutral line

and not the LIVE!

Always make sure that the Input to

Output LIVE pins have continuity and

that LIVE and Neutral are not swapped

in the Inverter.

the

Neutral

wire

User Manual