An off-grid solar system (off-the-grid, standalone) is the obvious alternative to one that is grid-tied. For homeowners that have access to the grid, off-grid solar systems are usually out of question. Heres why :

To ensure access to electricity at all times, off-grid solar systems require battery storage and a backup generator (if you live off-the-grid). On top of this, a battery bank typically needs to be replaced after *5 years. Batteries are complicated, expensive and decrease overall system efficiency.
Configuration detail

Item	Model	Description	Quantity
1	Solar Panel	Poly **0W solar panel	*6 pieces
2	Combiner Box	8 s 2 outputs	1 piece
3	Charge controller	*8V **0A	1 piece
4	Battery	*2V **0Ah (adjustable)	4 pieces
5	Off-grid Inverter	***0W EU standard or US standard	1 piece
6	Mounting Support	Pitched / flat roof, ground	1 set
7	Cable	Single-core 4mm2 and *6mm2 PV cable	**0 meters
8	Connector	MC4 connector	*0 pairs
9	Tools Bag	5 kinds of PV installation tools	1 bag
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  > *5 years Warranty
> Highest conversion efficiency of *7%
> Anti-reflective and anti-soiling surface power
loss from dirt and dust
> Excellent mechanical load resistance
> PID Resistant, High salt and ammonia resistance > PWM controller up to **0A
> MPPT controller up to **0A > Agm Battery
> Gel Battery
> 2V,*2V
Without a battery bank (or a generator) it well be lights out by sunset. A battery bank is essentially a group of batteries wired together

> Input Voltage from *2V to ***0V
> Input Ampere 5A to **0AH
> EU Output voltage: ******0/******0V

> US Output voltage: **0/**0/**8/**0/**7/**0V
> Single phase and Three phase    > Residential Roof(Pitched Roof)
> Commercial Roof(Flat roof&workshop roof)
> Ground Solar Mounting system
> Vertical wall solar mounting system
> All aluminum structure solar mounting system
> Car parking solar mounting system Accessories

By sea	Delivery from Shanghai or Ningbo seaport
By air	Departure from Shanghai Pudong Airport
By express	TNT / DHL