Domski
2018-03-11 16:41:47
- #1
The answer from describes it best. The usual photovoltaic systems are grid-tied, i.e. the grid voltage must be present, but the electricity is then drawn from the roof or from the battery.
Normally, the priority order is as follows:
- Electricity from the roof is consumed by oneself
- Surplus electricity from the roof charges the battery
- If there is still surplus left, it is fed into the grid
- If there is not enough electricity from the roof, electricity is drawn from the utility company
It does not matter whether I need more on one phase than on another, since the meters always only balance the total amount against each other.
There are also systems that can operate as autonomous island systems in case of need, but I do not know any that manage the transition without interruption. So they are not suitable as true emergency power supply.
Normally, the priority order is as follows:
- Electricity from the roof is consumed by oneself
- Surplus electricity from the roof charges the battery
- If there is still surplus left, it is fed into the grid
- If there is not enough electricity from the roof, electricity is drawn from the utility company
It does not matter whether I need more on one phase than on another, since the meters always only balance the total amount against each other.
There are also systems that can operate as autonomous island systems in case of need, but I do not know any that manage the transition without interruption. So they are not suitable as true emergency power supply.