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Grid-Tie with Battery Backup
Engineered Grid-Tie PV Systems with Battery Backup
These full-service renewable energy systems give you all the benefits of
utility interconnection and net metering plus energy independence. With
these grid-tie systems, backup AC power is made available in the event of a
utility outage, providing reliable power and peace of mind. An average
conversion efficiency of 89% to 91% using the California Energy Commission (CEC)
test protocol provides greater savings and a shorter time period for system
payback than previous designs.
Battery-backup grid-tie systems come with modules, array wiring,
combiner boxes, roof mounting structures, inverters/control systems with all
required over-current protection and disconnects. (Your specific
installation or utility may require additional AC disconnects, which we can
supply as needed). They require a 48-volt battery bank to operate. The size
of the battery determines the amount of backup power available during power
failure. Use the worksheet to determine battery bank size. Battery backup
systems qualify for the California Energy Commission incentives and the
federal tax credit.
Grid-tie systems with battery backup are
configured differently and are much more complex than standard grid-tie
systems without batteries. They need to be custom designed. If you need a
backup system, consult with us to determine all the system components that
you will need. .
Inverters for Grid-Tie with Battery Backup
OutBack also makes inverters and switchgear that can be assembled into larger grid-tie w/ battery backup systems.
Xantrex XW Series of inverters offers grid-tie inverters with battery backup capability in 6000-watt increments. Several can be stacked for 12kW or 18kW battery backup systems.
| Grid-tie systems with inverters installed indoors (see table below for batteries) | ||||||||
| PV watts |
Module Quantity |
Module Brand & watts |
Inverter Model |
Backup watts |
Output VAC |
SKU | Price | Purchase |
| 570 | 3 | Evergreen 190 | OutBack FLEXware system with one GVFX3648 | 3600 | 120 | 010-06724 | $9,791 |
 |
| 2850 | 15 | Evergreen 190 | OutBack FLEXware system with one GVFX3648 | 3600 | 120 | 010-06728 | $24,392 |
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| 5700 | 30 | Evergreen 190 | OutBack FLEXware system with two GVFX3648 | 7200 | 120/240 | 010-06732 | $46,749 |
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| 2850 | 15 | Evergreen 190 | Xantrex XW4548 with 1 XW-MPPT60 Charge Controller | 4500 | 120/240 | 010-07015 | $24,650 |
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| 4560 | 24 | Evergreen 190 | Xantrex XW4548 with 2 XW-MPPT60 Charge Controllers | 4500 | 120/240 | 010-07022 | $36,518 |
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| 5700 | 30 | Evergreen 190 | Xantrex XW6048 with 2 XW-MPPT60 Charge Controllers | 6000 | 120/240 | 010-07027 | $44,724 |
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| 660 | 3 | REC SCM 220 | OutBack FLEXware system with one GVFX3648 | 3600 | 120 | 010-07031 | $10,487 |
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| 2640 | 12 | REC SCM 220 | OutBack FLEXware system with one GVFX3648 | 3600 | 120 | 010-07038 | $23,721 |
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| 5280 | 24 | REC SCM 220 | OutBack FLEXware system with two GVFX3648 | 7200 | 120/240 | 010-07045 | $45,344 |
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| 3960 | 18 | REC SCM 220 | Xantrex XW4548 with 2 XW-MPPT60 Charge Controllers | 4500 | 120/240 | 010-07051 | $33,606 |
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| 5280 | 24 | REC SCM 220 | Xantrex XW6048 with 2 XW-MPPT60 Charge Controllers | 6000 | 120/240 | 010-07056 | $43,319 |
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| Battery packs for systems above | |||||||
|
watt-hours storage to 80% discharge |
Battery quantity |
System amp-hours |
Battery model | Battery rack | SKU | Price | Purchase |
| 3750 | 4 | 98 | MK S31-SLD-G | MidNite MNBE-B | 010-07085 | $1,445 |
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| 7500 | 8 | 196 | MK S31-SLD-G | MidNite MNBE-B | 010-07088 | $2,746 |
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| 11250 | 12 | 294 | MK S31-SLD-G | MidNite MNBE-C | 010-07092 | $4,053 |
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This page last up-dated on September 10, 2009