3 phase solar system

Lupus said:
Problem is for commercial properties they had to do that, cause of limitations I think.
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They put the 3 phase system in more to save costs than for load shedding and batteries for even a 'small' factory like theirs would cost a small fortune. I am not sure of commercial property limitations.
 
Neuk_ said:
They put the 3 phase system in more to save costs than for load shedding and batteries for even a 'small' factory like theirs would cost a small fortune. I am not sure of commercial property limitations.
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Well looking at places like Makro an other places anything over 1MW would've needed a license previously so that could've been an issue
 
ok I measured my various loads on the 3 phases, 2 phases are minimal during the day = geyser, stove etc. The "red wire" phase is using all the plugs which is 2500 watts, that's the phase I want to reduce. So I could put a single phase 5kw inverter on that phase with panels / no batteries just yet. If the power goes out (not that oftern then that's ok I can be lonely for a few load shedding hours.

I read up and it said even Hybrid inverters will turn off if the mains power is off, this protects the grid if Eskom is working on it and you suddenly start pumping power back down the line and kill them? something like that.
 
Wrath of Khan said:
ok I measured my various loads on the 3 phases, 2 phases are minimal during the day = geyser, stove etc. The "red wire" phase is using all the plugs which is 2500 watts, that's the phase I want to reduce. So I could put a single phase 5kw inverter on that phase with panels / no batteries just yet. If the power goes out (not that oftern then that's ok I can be lonely for a few load shedding hours.

I read up and it said even Hybrid inverters will turn off if the mains power is off, this protects the grid if Eskom is working on it and you suddenly start pumping power back down the line and kill them? something like that.
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Shouldn't be the case, true hybrid/non grid-tied inverters will pick up that grid is down and disable back feeding to 'protect' the grid, but terminology is all over the place at the moment.
 
Neuk_ said:
Shouldn't be the case, true hybrid/non grid-tied inverters will pick up that grid is down and disable back feeding to 'protect' the grid, but terminology is all over the place at the moment.
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Hybrid without battery will turn off when mains is off.
 
Hybrid without battery will power off, not only for protection but also to protect loads. Sunsynk can be used grid tied and battery added later. You can put a Sunsynk 8KW single phase and rewire the DB to put what you want on it as long as the main 3 phase breaker can handle it and you don't exceed the peak load the inverter can handle, we have done this where we left the clients 3 phase underfloor heating and rewired the rest of the house.
 
WELIHF said:
Hybrid without battery will power off, not only for protection but also to protect loads. Sunsynk can be used grid tied and battery added later. You can put a Sunsynk 8KW single phase and rewire the DB to put what you want on it as long as the main 3 phase breaker can handle it and you don't exceed the peak load the inverter can handle, we have done this where we left the clients 3 phase underfloor heating and rewired the rest of the house.
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but one can't really control the peak load, what happens if I go from 2500w and then put the microwave and a hairdryer on at the same time, suddenly spikes to 9000w for a few minutes... does the inverter trip / blow up / or use the max 8kw and then ask for an extra 1kw from Eskom?
 
The 8KW can passthrough an additional 4KW max from Grid without being inverted or causing damage, more than that and there are relays that will burn out. So roughly 12KW max on the 8KW inverter, not more than 8KW on backup side. This is a Sunsynk 8KW Inverter, you can see a couple times it spikes over 8KW with no issues

1655203883913.png
 
WELIHF said:
The 8KW can passthrough an additional 4KW max from Grid without being inverted or causing damage, more than that and there are relays that will burn out. So roughly 12KW max on the 8KW inverter, not more than 8KW on backup side. This is a Sunsynk 8KW Inverter, you can see a couple times it spikes over 8KW with no issues

View attachment 1330226
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excellent thanks for the info
 
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