I have had up to 5 arrays going at one time.
As long as the output does not overload the power outlet ( obviously) there is no problem Normally.
The only trouble you may have is high line voltage if The wiring to your shed is too distant or small and the other inverter is feeding the same circuit. Could not see that coming near a problem in this case if the shed is wired in 2.5MM but if it only has 1.5 wire which it shouldn't if there are power outlets it may go high on voltage and the inverter will trip it's high voltage protection.
Other than that, you should be fine.
There are many meters and depends how you are set up. Some meters record consumption and generation, some are seperate meters. In either case I can't see a problem given you already have solar. What is likely to happen is the 1 Kw system will supply your household loads and the present system will effectively increase it's feedback. If you are on a FIT you should see an increase in that if your consumption stays the same.
You could also with the 1 KW system get some more used panels and put on it. You can over clock the inverters as much as you like. they will only do their rated output. Panels are far from 100% efficent so even 1.5 Kw of panels on a 1.5 KW inverter is rarely if ever going to make full capacity. By adding extra panels, you will get the inverter on song quicker and longer. With enough panels you could be at max output at say 9:30 am and stay there in summer till 6pm depending on orientation and tilt.
The best part about over clocking the inverter with panels is you make good power when you need it the most, on shitty days and in winter.
To also make the most of the off times, the flatter the panels the better. You only need about 5o tilt for cleaning . I have a couple of arrays at 7o and they work better than the larger tilted arrays in winter and i don't see the panels getting any more buildup on them. One of the arrays is south and because they are relatively flat they do very well in summer. yeah, they are crap in winter but so is my west array and generation falls through the floor even when everything is perfectly set up for winter. The energy just isn't there to start with.
I was laughing to myself the other day that even though it was completely overcast all day long, I still made a lot more power than I often do on bright sunny winters days.
You could look at getting some more panels if you have the room on the shed roof and hook them to this inverter as well. Don't worry about the wattage too much but do try to match the voltage close as you can and then parallel the arrays. You don't have to have the voltage spot on as the output pulls down and equalises itself out.
I have one array that is 3 different sets of differing panels in output and voltage and they have been working fine for over a year now.
If you are paying thousands for a new system then it probably pays to follow the " Rules" but I have found that like many things they are more fluff than hard and fast.
All my panels and inverters are used and I have broken more rules than I have followed and never had any trouble and get good outputs from my systems.
If you do intend to install a DC shutoff from the panels ( I don't bother half the time, Pull a connector apart quick or shut the AC off and then pull the connector ) be aware you can't wire an AC breaker through in the conventional way. DC will arc and burn the crap out of an AC switch in a couple of actions if it does not keep going till it sets the thing on fire. Probably not so much with teh size setup you will have but with one of my arrays Pumping 9KW....
DC breakers are expensive so being a Tight arse I have used conventional 10A Breakers but used ganged pairs ( joined so they both switch together ) and wired both the pos and neg sides through the breakers. They arc no more than switching off a heavy AC load. Must have switched my big array 50 time now under load and no problem at all. Another thing I found is you CAN use normal DPDT relays on the DC switching. The trick I found and not to switch the DC off but rather to divert it. This gives the arc something to jump to that is a load and stops the arc. I found through testing that you don't need the dump load to be as much as the main load but 50% is about as low as I would go.
I was switching a water heating element and was diverting to a stove element of much lower rating when I wanted to switch off the water heating element. Using the same relays with no dummy load on the other side gave big arcs twice then the relay melted and caught fire the 3rd time.
This soundsl like a good score and something that you can save yourself and even make some bucks with possibly!
Bookmarks