Question about sizing a SMA Off Grid System using Sunny Boy & Sunny Island

[Bendesa1962]

Hi everyone,
I have a question about sizing an Off Grid system using SMA components Sunny Boy and Sunny Island.
The design of SMA is basically different than other brands. (AC Coupling) The PV Modules are connected to the Sunny Boy. The Sunny Boy is connected to the Sunny Island. Normally the PV Modules would be connected to the charge controller.
This is the situation:
Location Jayapura West Papua Indonesia
Ground Mounting so optimal azimuth and tilt
Sun Peak Hours per day 4,88 (worst case)
Days of autonomy 1
Operational Voltage battery bank 48 volts
Single phase
According to you specialists what do I need?
So far I came up myself with:
18 kWh per day
Calculating losses 30%
18/0,7 = 26 kWh
23 300 Wp PV modules produce 26 kWh per day ((according to Sunny Design SMA design software webversion free of use, I can recommend it)
23 x 300 = 6.9 kWp PV System
2 x Sunny Boy 3600 TL 21
1 x Sunny Island 8.0H
48 x 2 volt 620 Ah batteries
Please advice
Thanks a lot and for everybody a fine newyears eve and a fantastic sunny 2017

[solarix]

Do you need 240Vac? SunnyIslands only do 120V and if you need 240V (or need to intertie with a 240V grid), you need to either use dual SunnyIslands or use their "SMArtformer". Gets pretty expensive....

[Bendesa1962]

Do you need 240Vac? SunnyIslands only do 120V and if you need 240V (or need to intertie with a 240V grid), you need to either use dual SunnyIslands or use their "SMArtformer". Gets pretty expensive....

Hi thanks for your reply. In Indonesia we need 220 volts AC and 50 Hz cycle power.

[Mike90250]

Other problem. 18KWh daily usage & est 26KWh harvest, leaves little space for recharging after 1 cloudy day.
with a 59,520 KWh battery getting a generator would be essential to keep the battery healthy, since you don't have much extra solar capacity

[solarix]

"In Indonesia we need 220 volts AC and 50 Hz cycle power." Just make sure you get the (non-US version) SMA inverters that can be configured for your power type.

[Bendesa1962]

yes I found out about that. The US versions have a output of 120 Volt. The none US versions can be used here in Indonesia Thanks for your tip!