EcoRenovator - View Single Post - Insights on a mini-AC grid design

Ryland · 03-13-12, 03:55 PM

As it has been pointed out already, grid tie inverters only work when the power grid is working and they sell back any extra power you produce, so in an area that has the grid go down a lot and that you can't sell back, it sounds like a poor choice to make, also if you already have to have a regular inverter then the cost of upgrading that to a 40kw shouldn't be that far from buying 40kw worth of grid tie inverters plus a 20kw stand alone inverter.
Also with Maximum Power Point Tracking (MPPT) you can get the rated output or even higher from the panels and there are MPPT charge controllers so you don't cook your batteries.
what kind of place are you powering? from the size of the system it sounds like it's either a huge building or a small village.

03-13-12, 03:55 PM	#7
Ryland Master EcoRenovator Join Date: Mar 2009 Location: Western Wisconsin. Posts: 913 Thanks: 127 Thanked 82 Times in 71 Posts	As it has been pointed out already, grid tie inverters only work when the power grid is working and they sell back any extra power you produce, so in an area that has the grid go down a lot and that you can't sell back, it sounds like a poor choice to make, also if you already have to have a regular inverter then the cost of upgrading that to a 40kw shouldn't be that far from buying 40kw worth of grid tie inverters plus a 20kw stand alone inverter. Also with Maximum Power Point Tracking (MPPT) you can get the rated output or even higher from the panels and there are MPPT charge controllers so you don't cook your batteries. what kind of place are you powering? from the size of the system it sounds like it's either a huge building or a small village.