Through net-metering, grid-tied inverters enjoyed $ from the power company, but when the grid went down they had no battery backup. You don't see that happening usually because the "something else" is roughly the same cost as the off-grid inverter, so total inverter costs end up being twice as much.īack in the old days, you were on-grid or off-grid, and got the matching inverter. when you could use low voltage DC hot-water elements meant for campers for a far lower price).īut, microinverters can work off-grid. This is why everyone suggested alternatives to hooking microinverters directly to a hot water tank - it takes more gear making it more expensive (esp. I would seriously caution you from pursuing this line of thought any further unless you are prepared to install a suitable UL1741 hybrid inverter and set up the system properly for AC coupling with the microinverters.Ĭlick to expand.So, just wanted to take a minute to clarify what's what.įor any grid-tied inverter to work in an off-grid situation, something "else" must create a stable microgrid and control the off-grid inverter output. The other scenario is the 100W PSW has a bunch of extra current pushed back through it and gets smoked. Under any other conditions the voltage, frequency or current will go out of range (see UL1741 anti-islanding specs.) and the micro-inverters will just shut down if you are lucky. If a fixed load is connected then the system will only work when the load demand is PERFECTLY balanced with the sun intensity, angle, temperature Etc. In other words, they always try and produce as much, or little, electricity as possible with whatever solar radiation is available at that instant. However, grid-tie inverters have no internal means of output control. A grid-tie inverter can be induced to turn on with a suitable source of clean AC power. Click to expand.Theoretically, your proposed system will kind of work BUT it would be highly unstable and most likely be unsatisfactory so I'm going to agree with what svetz said.
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