Electronics > Projects, Designs, and Technical Stuff
looking for a way to connect a pv grid, the main grid, and the house wiring.
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kripton2035:
let's assume I have a 1kW PV array, and a grid subscription of 6kW.
I'm looking for a device that would switch between the PV or the grid to the house wiring
the PV would be prioritary, so for all low power devices with less than a total 1kW the PV would feed.
if I switch a more hungry device, the device would switch to the grid.
there must be no interrupt time during the switch.


bonus: the device could still feed the 1kW from the PV plus the kW needed from the grid when let's say a 2kW device comes on, the PV feeds 1kW and the grid 1kW.


thanks for any hint.
kripton2035:
more bonus: the device should charge an expandable array of batteries.
Monkeh:
Your magic search terms are: Grid-tie inverter and battery backup.
station240:
It's called a hybrid inverter.
Takes say 48V input (batteries), PV input and AC input (main grid).
Output is AC.

Batteries can be charged by any of the 3 inputs.
kripton2035:
will it work with a very small battery (as it is the most expensive part of the system)
I have very rarely power outage, I only want to use PV when there is sun or light, and grid otherwise.
for a 5KWh system, a simple PV with controller is around $7000, and with the batteries it comes to some $15000...
I could buy the PV+controller and small battery first, and then eventually later buy some batteries to have some spare energy.
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