sunny island in a bimodal system without use of a sunny boy?

[slayercuzz]

i am designing a bimodal pv system (grid tied with battery backup) I want to use SMA products.

can i use a sunny island without using a sunny boy?

My concern is that the sunny island will cause islanding (power flow out to the grid when the grid is down)

does the sunny island have a setting to monitor for grid signal and cut off production sent to the grid in event of a grid fauilure? or is this only possible in an ac coupled configuration?

[inetdog]

i am designing a bimodal pv system (grid tied with battery backup) I want to use SMA products.

can i use a sunny island without using a sunny boy?

My concern is that the sunny island will cause islanding (power flow out to the grid when the grid is down)

does the sunny island have a setting to monitor for grid signal and cut off production sent to the grid in event of a grid fauilure? or is this only possible in an ac coupled configuration?

The Sunny Island cannot be connected to the power grid on its AC output side. By itself it can only use battery power to generate AC to a variable load.

What it can do when paired with one or more Sunny Boys is serve as a substitute for the grid and let the GTI inverters work even though there is no grid power. To do that, they must be positively isolated from POCO by a transfer switch. In one position of the switch the SBs are connected to POCO and the SI is connected at most to some isolated loads. In the other position of the switch the SBs are connected to some subset of your loads but not to POCO and the SI is then switched to power that same set of loads. After a qualifying period of seeing stable AC the SBs will start to produce power. As they pick up the load, the SI will cut back on the power it is contributing.
If at any point the SBs start to produce more power than is needed by the loads the SI will signal the SBs to reduce their power output. Not many GTIs can respond properly to this signal from the SI so some other steps would have to be taken to prevent excess power production by the GTIs.

[Naptown]

The SB and SI are probably the easiest system to install. When installed according to their instructions there will be no feeding to grid when down.
The only down side is they only make a 120V version last I checked so if you have anything that requires 240V you need two of them.
Gets a bit pricey.
Remember this is essentially an AC coupled system. If the inverters trip off on low battery and there is no generator and charger they are in the dark until the grid comes back up.
My personal preference is the Xantrex xw series. A bit of a pain to program correctly but there are no issues with diversion loads (I am not sure about the Sunny Island and if this requires it The magnums generally do) and one piece of equipment (well 2 if you count the CC) does the trick at about 1/2 the cost of the SMA version.

[bechir hasbani]

solar bimodal system

i am designing a bimodal pv system (grid tied with battery backup) I want to use SMA products.

can i use a sunny island without using a sunny boy?

My concern is that the sunny island will cause islanding (power flow out to the grid when the grid is down)

does the sunny island have a setting to monitor for grid signal and cut off production sent to the grid in event of a grid fauilure? or is this only possible in an ac coupled configuration?

- you can use the sunny tripower STP 15000 / 20000 or equivalent for the on-grid inverters and the sunny island I8.0 or equivalent with backup batteries for the off-grid inverters system.