Selectronic SPMC240 Service manual

SP PRO Generic AC Coupling
Technical Bulletin
TB0006 Revision 01 –1 of 7
POWER PERFORMANCE PASSION
SP PRO Generic AC Coupling
Introduction
A generic grid tie inverter is a grid tie inverter that is not a KACO Powador 02 or 00 series. For
information on fully managed AC coupling using the KACO Powador 02 or 00 series inverter see
“IN0018 SP PRO KACO Managed AC Coupling Installation Notes”.
The SP PRO Generic AC Coupling provides a method of linking generic grid tie inverters to the
SP PRO via the AC Load supply allowing the PV Solar to be available during a grid outage. This
configuration is only suitable for Solar Hybrid (grid connected) power systems where grid export
limit is not required. For off grid systems or where full control of the PV solar is required
(including grid export limit) use SP PRO KACO Managed AC coupling.
This document details the additional steps needed to install the generic system. The SP PRO
and generic inverters can be installed as per their individual installation instructions.
Note: This document needs to be read in conjunction with the SP PRO Instruction Manual and
the appropriate generic inverter Instruction Manual.
Overview
The following is an overview of the connections which form part of the AC Coupled installation
of a generic grid inverter and SP PRO.
Note: Maximum Grid inverter AC output current to be not more than SP PRO rating.

SP PRO Generic AC Coupling
Technical Bulletin
TB0006 Revision 01 –2 of 7
System Requirements
To successfully install a SP PRO generic system, there are particular system requirements that
need to be met.
This installation document is applicable to SP PRO series I and II.
Combined maximum AC output of all the connected generic inverters must not exceed
the continuous SP PRO output power rating.
Battery bank must be sized to suit the SP PRO model and the combined maximum AC
Output power of the generic inverters.
SP PRO must have appropriate firmware version installed (Rev 7.0 and above).
SP PRO generic AC coupling is only suitable for grid connected systems.
SP PRO generic AC coupling cannot control any grid export limits.
The Grid Disconnect function in the Solar Hybrid Control should not be used.
SP PRO MODEL AND TOTAL GENERIC AC OUTPUT
The total AC output of the Generic inverters must not be greater than the nominal capacity of
the SP PRO.
SP PRO Model
Combined maximum KACO AC
Output power
SPMC240
3 kW
SPMC241
4.5 kW
SPMC481
5 kW
SPMC482
7.5 kW
SPMC1201
7.5 kW
SPLC1202
20 kW
Table 1: Maximum Generic AC output per SP PRO model

SP PRO Generic AC Coupling
Technical Bulletin
TB0006 Revision 01 –3 of 7
POWER PERFORMANCE PASSION
SP PRO MODEL AND MINIMUM BATTERY CAPACITY
The minimum battery capacity that must be connected to the SP PRO inverter varies depending
on SP PRO model, an overriding minimum battery capacity and the combined maximum generic
AC Output. The following table defines the minimum battery capacity for each SP PRO model.
Minimum Battery Capacity
SP PRO Model
Combined
max.
generic AC
Output
SPMC240
SPMC241
SPMC481
SPMC482
SPMC1201
SPLC1202
1 kW
180 Ah
180 Ah
180 Ah
180 Ah
100 Ah
250 Ah
2 kW
180 Ah
180 Ah
180 Ah
180 Ah
100 Ah
250 Ah
3 kW
240 Ah
240 Ah
180 Ah
180 Ah
100 Ah
250 Ah
4 kW
320 Ah
180 Ah
180 Ah
100 Ah
250 Ah
5 kW
400 Ah
200 Ah
200 Ah
100 Ah
250 Ah
6 kW
240 Ah
100 Ah
250 Ah
7 kW
-
280 Ah
112 Ah
250 Ah
8 kW
-
250 Ah
9 kW
-
250 Ah
10 kW
-
-
250 Ah
11 kW
-
-
-
250 Ah
12 kW
-
-
-
250 Ah
13 kW
-
-
-
250 Ah
14 kW
-
-
-
250 Ah
15 kW
-
-
-
250 Ah
16 kW
-
-
-
-
-
256 Ah
17 kW
-
-
-
-
-
272 Ah
18 kW
-
-
-
-
-
288 Ah
19 kW
-
-
-
-
-
304 Ah
20 kW
-
-
-
-
-
320 Ah
Table 2: Minimum battery capacity per SP PRO model and Total generic AC power
Note 1: Shaded cells = minimum battery capacity
Note 2: –= n/a, maximum power exceeded for that SP PRO model.
Note 3: Battery capacity is C10 rating.
Note 4: Round battery capacity up as appropriate to available battery sizes.
Ensure that the system meets these minimum battery capacity requirements. Any battery
combinations larger than the minimum are suitable.

SP PRO Generic AC Coupling
Technical Bulletin
TB0006 Revision 01 –4 of 7
SP PRO Firmware Requirements
The SP PRO units’ Software Version 7.0 or later is required
SP PRO Software Version 7.0 or later is required.
To check software revision run SP LINK, connect to
the SP PRO and go to Data View –Technical Data
–“SP PRO Revision” and “Software Version”
Older revisions of firmware must be updated
to firmware revision 7.00 or later.
Do NOT change any configuration settings
until firmware is updated.
Note: Selectronic web site –http://www.selectronic.com.au for latest SP PRO firmware and
Tech Note 34 SP PRO Firmware Update Procedure.

SP PRO Generic AC Coupling
Technical Bulletin
TB0006 Revision 01 –5 of 7
POWER PERFORMANCE PASSION
Installation
The SP PRO and generic inverters should be installed as per their respective installation
instructions.
GENERIC AC WIRING
The generic AC output wiring must be connected to the AC Load terminals of the SP PRO in
accordance with local wiring rules for correct operation.
Generic AC Wiring guide for Grid connected installation
Note: This is only suitable for use with the grid supply.

SP PRO Generic AC Coupling
Technical Bulletin
TB0006 Revision 01 –6 of 7
CONFIGURATION –ADDITIONAL SETTINGS
The settings detailed here are only the additional settings required to enable Generic AC
Coupling. The remainder of systems settings are not covered in this document.
The SP PRO must have the Generic settings configured in the SP PRO before any of the
generic inverters are energised. The AC coupled failsafe system in the SP PRO is only enabled
when the correct configuration has been programmed into the SP PRO.
SP LINK –CONFIGURATION SETTINGS –SYSTEM
The additional system settings required are detailed and shown below.
Enable Generic AC Coupling
SP LINK - Configuration Settings –System tab
Grid Export Limit and AC source Power settings
Set the AC Source Power (in Configuration Settings –Quick Start) to a value that is higher than
the total maximum power output of the connected generic grid tie inverters
If any of the Solar Hybrid Control - Priority (in Configuration Settings) Schedules are Enabled
then ensure that ALL of the used Grid Export Limit settings have been set to a value that is
higher than the total maximum power output of the connected generic grid tie inverters.
Additionally it is recommended setting all of the Grid Disconnect settings to Disabled (default
setting).
The SP PRO cannot control the output power of the generic AC grid tie inverters therefore
cannot control these functions.

SP PRO Generic AC Coupling
Technical Bulletin
TB0006 Revision 01 –7 of 7
POWER PERFORMANCE PASSION
SP LINK - Configuration Settings –Solar Hybrid Control and Quick Start –AC Source Power
SYSTEM COMMISSIONING –ADDITIONAL TESTS
In addition to the normal system testing that would be performed, the following additional tests
must be performed as detailed below.
Verify ac coupled fail safe.
1. Switch off grid supply (AC Source input to SP PRO)
2. Switch Off all AC Loads whilst keeping Generic Inverter running
3. Monitor battery voltage for increase above battery charge voltage
a. SP PRO will increase frequency (up to 55 Hz as required) of AC Load forcing
generic inverter to switch off due to grid frequency
4. Verify generic inverter switches off due to frequency increase
Operation
The SP PRO will operate normally, exporting and charging as set and required.
The AC Load readings including AC Load kWh accumulations will be inaccurate during generic
AC coupling inverter operation. This is due to the generic inverter directly feeding the AC load
which the SP PRO can only detect as a reduction in load. This is normal operation.
Additional Information
Selectronic web site –http://www.selectronic.com.au or contact the Selectronic Sales Team.