Hedges
I See Electromagnetic Fields!
- Joined
- Mar 28, 2020
- Messages
- 20,059
"Today not even a small solar panel is connected to OffG inverter. Not needed."
Moving some PV panels to it will let it run longer during grid failures. Too much PV, and available power goes to waste because you're not using it for loads at that time.
If you rig up a way to switch over some panels during a power failure it can remain up longer.
I would get a switch rated for Voc of the PV string (e.g. a 600VDC heavy-duty disconnect) and use that to open the GT PV string.
Then inside the box, have pluggable connectors (e.g. MC4 with retaining clips cut off), bundled so suitable groups of panels either connect in series for GT inverter, or connect in parallel (if required for lower Voc limits) to MPP.
A 3PST switch might serve to connect up to 3 strings to the MPP, so no current flowing while mating connectors. Once box is closed up again, throwing the switch connects the strings.
Moving some PV panels to it will let it run longer during grid failures. Too much PV, and available power goes to waste because you're not using it for loads at that time.
If you rig up a way to switch over some panels during a power failure it can remain up longer.
I would get a switch rated for Voc of the PV string (e.g. a 600VDC heavy-duty disconnect) and use that to open the GT PV string.
Then inside the box, have pluggable connectors (e.g. MC4 with retaining clips cut off), bundled so suitable groups of panels either connect in series for GT inverter, or connect in parallel (if required for lower Voc limits) to MPP.
A 3PST switch might serve to connect up to 3 strings to the MPP, so no current flowing while mating connectors. Once box is closed up again, throwing the switch connects the strings.