SunSynk Aux Load Output on Parallel Inverters - Does It Work?
ฝัง
- เผยแพร่เมื่อ 15 ต.ค. 2024
- Can you connect the Aux load output on two parallel SunSynk inverters. (or Deye Inverters)
Sunsynk say "...better not to use..."
I show you my paralleled inverters working with the Aux loads connected in parallel. This is not advice, or a recommendation to do this. It's purely demonstrating that it appears to be working on my system.
#solar #deye #loadshedding #seplos #lifepo4 #offgrid #offgridliving #aux #load #port
Your discussion is an interesting issue.
I am not a Sunsynk engineer, but have been installing and testing Sunsynk inverters for approx 2 years.
Sunsynk says:
"A generator can either be connected to the Grid side or to the Gen connection. When connected to the Grid
Input, the inverter will consider the power coming from the generator as ‘Grid Supply'. Users should ensure
this power goes to the LOAD only and should not be exported to other outlets, as this will damage the generator.
An advantage of connecting the generator to the Grid Input is that it can be paralleled, whereas the GEN/
AUX input cannot be paralleled. That means the inverter will extract what power it requires from ‘Grid Supply’
to charge its batteries."
I believe this is badly written/explained.
There are 2 types of 'parallel' configuration.
1. Connecting the inverters in 'parallel' as a single phase system using a single phase supply
2. Connecting the inverters in 'parallel' as a three phase system using a 3 phase supply
The discussion about 'paralleling' only refers to a single phase system
The first paragraph reference connecting a generator to the GRID port and makes perfect sense when using a single phase system. The GRID ports can be connected in parallel, and the generator can be used as the Grid supply. In this scenario the paralleled inverters will be running in sync, ie. the frequency is in sync between all the inverters. The last sentence makes no sense.
The second paragraph is confusing. I think what this is saying is that if you have a Grid connection to the inverters that are configured to operate in parallel, you cannot connect a generator in 'parallel' with the Grid connected. It has nothing to do with the paralleling of the AUX/GEN ports.
To connect a generator to one or more Sunsynk inverters connected to the Grid, it is necessary to configure an ATS or isolating relay on the Grid side to prevent the two sources from being connected at the same time.
I have not tested the following theory.
There is one situation where having the GEN/AUX ports connected in parallel can cause an issue particularly if you do not have the 'Load/UPS' ports connected in parallel and only the 'Grid' ports are connected in parallel.
If the Grid fails the inverter will disconnect from the Grid. If the smart load has not yet activated, then the inverters are no longer connected in parallel except for the comms. Will the inverters keep their frequency synchronized if there is no parallel connections for a period of time? If not, then it is possible when the GEN/AUX ports are connected as a result of the activation of the smart load requirement and if the inverter frequencies have drifted, this could cause a serious problem.
Hi, I have 2x 5.5kW Inverters Paralleled together using Single Phase. Currently, I am not using the AUX Port. Both Inverters have their own PV Arrays. Currently, we never use the water heaters heating element at all although it is wired up to an RCD, it has always been switched off (due to cost) and we rely on the oil boiler to heat the cylinder. If I want to use the Sunsynks AUX Load Output to heat my water heater (which contains a 3kW element) from excess PV, can I isolate that RCD from the consumer units grid supply and instead connect both Inverters Aux Ports to that RCD instead? Also, when making the changes to settings in the Auxiliary Load screen, do I mirror these settings on both inverters?
@chrisgroothoff2611 Nice post, thankyou. You make a few very good points there.
"I believe this is badly written/explained" - I couldn't agree more here.
"Users should ensure this power goes to the LOAD only and should not be exported to other outlets, as this will damage the generator." - The only way this makes sense is if they are referring to other outlets prior to reaching the inverter, ie other consumers and loads on the grid supply. So obviously in this situation, the inverter cannot control the power demand, and therefore the generator would be maxed out. So that's the only way I can make sense of that part.
"Will the inverters keep their frequency synchronized if there is no parallel connections for a period of time?" - This is what I was referring to in the little throw away comment in the video. My gut feeling is that the comms will keep the frequency matched, but I wouldn't place a large bet on it. However, as interested as I am on this one, I don't have the equipment to test this.
@healeydave So the simple answer to your question is, yes. I am assuming that there is an mcb in there to limit the current on the water heater circuit, or the rcd is an rcbo. Otherwise, what you propose is exactly how mine is set up.
The master inverter will control all your aux load commands for the slave inverter, just the same as all the other settings. 👍
As for the "solar" figure? maybe yours works as a trigger point, unlike mine. If not, then be careful not to set your grid charge higher than your Aux Load On/Off figures, otherwise you'll just end up heating water off the grid.
Thanks for the video. What is the output capacity of the AUX port when being used as a Load output?
If I want to turn on my 3kW water heater element when my batteries full, can I just run a suitable cable from the AUX port on the inverter to a breaker that connects straight to the Water Heater ?
To my knowledge, the aux port is capable up to the full capacity of the inverter. I certainly can't find any information to contradict that.
Essentially yes, the aux system is as you describe. I'd maybe put an RCD in the mix as well though.
If running as a grid connected system, then there's not really any issues to deal with.
If running as an off-grid system, then there is the problem of not knowing whether the aux port is supplying or not, so it becomes easy to overload the inverter capacity.
@@kindabusydoin I am using my Sunsynk AUX Output to drive my "hot water geyser" element when the batteries reach 100% during the day. Once it drops to 90% late roin the day, the AUX output is cancelled. The Heatimng Element is 2KW, 240V,50Hz here in South Africa. It is a grid connected system. The Solar Power setting was adjusted to 10 Watts to make it work regardless. One thing to note is - I had to install a AC Contactor or relay or let's say an OR switch between the AUX and the Grid power to drive the heater element. My electricity bill dropped by a third. Running it like this for 18 months now. One thing - the Sunsynk App/software on the phone does not show any AUX Technical details I could find, which is a pity.
It's certainly a money saver getting the free hot water, I've noticed the difference in my oil water heating usage as well this summer.
The app does actually show the aux usage.
From the main page, go into Equipment»(then into the inverter, or master inverter if in parallel)»Custom»Parameter Selection
From here you can scroll to Generator, and select "Daily" and confirm it. The custom chart should now plot "Daily Production Generator". As we are using the Gen/Aux port, it just sees it as a generator current, but actually it's the Aux output.
As for installing an AC contactor relay... It can be done this way with no problem at all, however, I've since read somewhere in a Sunsynk document (can't remember which) that the Aux port is capable of supplying the full capacity of the inverter, so you should be able to cut that relay out if you want to at some point in the future.
+
👍