Evening all - hoping you can help educate me, actually learnt quite a bit from these forums already.
I have a RHI-6K-48ES-5G and 3x us3000c batteries, the backup circuit isn't connected yet and I want it to be with the amount of power cuts.
What I don't understand is - why do I have to prioritise certain circuits (lights/fridge freezer etc etc) when the house can run from batteries exclusively for hours? Obviously there is an upper limit with 3xus3000c batteries discharge rate of 37amps each? but i would have to have a lot on at the same time to get to it?
Can someone explain how that port is meant to be wired in?
I'll try... ??...
There are two things to consider.
a) I am assuming that the whole house is presently connected to the grid as well. Hence your Solis will currently be supplying the house load via its ac-grid connection. If there is a power cut, the Solis (as with any other approved grid-tie inverter) will automatically stop sending out power. This is a legal requirement and is done to prevent electrocuting line engineers working on the faulty grid socket.
b) As well as the battery discharge rate, you will be limited to 5000W output from battery alone (or up to 6000W if there is 1000W+ of solar energy being generated) - this is typically not enough to run a house on.
The Solis RHI has an ac-backup supply that can provide that 5000W-6000W of power in the event of a power cut. That needs to be on a separate circuit to the grid connection for reason (a).
The theory therefore is to re-wire your house so that you can have a 'critical-loads' circuit, powered by the ac-backup circuit. That will ensure isolation from the grid in the event of a power cut as well as not having more than 5000W of load on it. e.g. so you won't trip the inverter if you switch on the kettle or oven (or put the dishwasher on at the same time as the tumble dryer etc.)
The two gotcha's though (don't ask me how I know!) are that:-
1) The Solis ac-backup will normally pass through the ac-grid supply BUT it only does that when the Solis is powered by solar or battery. If it is the middle of the night and your batteries run out the ac-backup circuit will cut out, even when the grid is working just fine. Similarly if you restart the Solis or batteries (at night) your backup circuit will go down.
2) The Solis will trip if you attempt to power up several inductive loads (e.g. fridges) at the same time, even if their nominal power is way below the power that the Solis can provide. So you may need to turn them on individually to get up and running - and then hope they don't all decide to turn on simultaneously on their thermostats!
Hope that helps