Installation Manual

Appendix D – Detailed System Connection
51
Figure 41: Backup Power Only – Two Battery Configuration, Distribution Panel – Backed-up Loads Panel Connection
20A
CB
20A
CB
20A
CB
20A
CB
Backed-up Loads Distribution Panel
BU_L1
BU_L2
25A
CB
25A
CB
BU_N
Backup Neutral bus-bar
Backup
Panel Main
Breaker
Backed-up Loads
Breakers
To the backed-up loads
L1 L2
Main
Distribution
Panel
CB
CB
CB
CB
CB
40A CB
CB
40A CB
Neutral
bus-bar
L1_Grid
N_Grid
L2_Grid
Connection to utility meter
L1
N
L2
3
Main Breaker
3/4" Conduit
2
1" Conduit
Inverter AC Grid [L1, L2, N], 6 AWG (4-20 AWG)
PV DC+, 10 AWG (4-20 AWG), 600V insulated
PV DC- , 10 AWG (4-20 AWG), 600V insulated
Batt. HV DC+, 10AWG (10-12 AWG), 600V ins.
Batt. HV DC-, 10AWG (10-12 AWG), 600V ins.
+
-
V+
V-
2
PWR
V+
G
5
RTN
En
A+
B-
EN
P
N
Thermal [V+, V-], 16AWG (12-16 AWG),
Shielded pair, 600V insulated
Control [V+, G, En, A+, B-], 24AWG (16-24 AWG),
Shielded pair, 600V insulated
+
-
PWR
RTN
EN
P
N
12A/600V fuses
Fused combiner box
1
st
port
2
nd
port
1
st
port
Thermal
Battery #1
RS485
Not
Terminated
Thermal
Battery HV DC+, 10AWG (10-12 AWG), 600V insulated
Battery HV DC- , 10AWG (10-12 AWG), 600V insulated
Battery HV DC+
Battery HV DC-
PWR
EN
P
N
RTN
Battery #2
RS485
Terminated and
biased
RTN
EN
P
N
2
nd
port
Battery #1 switches settings:
Battery #2 switches settings:
3/4" Conduit
StorEdge
Inverter*
BAT
IN
Fuses
12A
Auto-
transformer
3/4" Conduit
L1_A.T.
N_A.T.
L2_A.T.
T1
T2
Auto-transformer AC [L1,
L2, N], 8 AWG (6-20 AWG)
3
2
Temp. sense [T1, T2], 24AWG
(16-24 AWG), 600V insulated
L1_A.T.
N_A.T.
L2_A.T.
T1
T2
L1_BU
L2_BU
N_BU
Inverter AC Backup [L1, L2, N],
6 AWG (4-20 AWG)
CB
CB
CBCB
CBCB
CB
CB
CB
CB
CB
CB
Notes
Note 1: StorEdge Inverter:
 SE7600A-USS0 supports double capacity
 SE7600A-USS2 supports double power and double capacity
- Replace the internal 12A fuses with 25A fuses for two batteries
Recommended Fuses in StorEdge Inverter:
 12A 600VDC Quick-Acting, 10 x 38 mm Solar Midget Fuses (Example: littelfuse P/N 0SPF012)
 25A 600VDC Quick-Acting, 10 x 38 mm Solar Midget Fuses (Example: littelfuse P/N 0SPF025)
Note 2: External fused combiner box is needed to support two batteries
Note 3: Auto-transformer connection:
 6ft max
 Vertical mounting only (conduit connection from the bottom)
 Use 10 AWG wire for grounding
Note 4: Battery connection:
 35ft max
 Distance larger than 5ft requires installation of external DC safety switch on the battery side
 Control [B-,A+] must be twisted pair
Note 5: Use a twin-wire ferrules to daisy chain the thermal wiring
Note 6: Install type B 2-pole 25A main circuit breaker to ensure the 25A phase limit imbalance is
maintained at all times.
Note 1
Note 3
Note 4
Note 2
Note 5
RS485-1 Terminations
Move up the left switch
Note 6
3
3/4" Conduit
Type B for main circuit breakers