February 13, 20242 yr A friend of mine has 2 x 5.5k Deye inverters each coupled to a Hubble AM2, and connected to a phase each on his 3 phase board (the 3rd phase is connected only to Eskom). He is finding that one of the inverters trips when the phase is intermittently overloaded (usually when a big aircon is switched on top of the normal load)- can he solve this problem by connecting the inverters in parallel and adding a 3rd battery?
February 13, 20242 yr 2 hours ago, AfricanTech said: A friend of mine has 2 x 5.5k Deye inverters each coupled to a Hubble AM2, and connected to a phase each on his 3 phase board (the 3rd phase is connected only to Eskom). He is finding that one of the inverters trips when the phase is intermittently overloaded (usually when a big aircon is switched on top of the normal load)- can he solve this problem by connecting the inverters in parallel and adding a 3rd battery? Yes it would help. Even without a 3rd battery.
February 14, 20242 yr Note, you would then only have backup power on the one phase, but increased to 10kw. So this would require an electrician to change the essential loads around and put them all onto the phase with the inverter. Edited February 14, 20242 yr by abd7
February 14, 20242 yr Author Thanks for the replies - ok, so all essentials would need to move to a single phase. Non-essentials then on the other phase which would be completely isolated from the inverters and also not be constrained by the inverters when Eskom is up
February 14, 20242 yr You also won't be able to feed back extra solar power to them with the CT coils, which you could have done on non essentials on the same phase.
February 14, 20242 yr 3 hours ago, AfricanTech said: Thanks for the replies - ok, so all essentials would need to move to a single phase. Non-essentials then on the other phase which would be completely isolated from the inverters and also not be constrained by the inverters when Eskom is up No you still want non essentials on the same phase as essentials so that you can power them during the day time with excess PV. DB must just be split. If you have them in parallel you should have enough reserve to start loads like a big aircon. You will end with 20kW available for starting during the 10sec of 2x normal output. Not sure what loads one would leave on the 2 non backup phases.
February 14, 20242 yr Author 46 minutes ago, Scorp007 said: No you still want non essentials on the same phase as essentials so that you can power them during the day time with excess PV. DB must just be split. If you have them in parallel you should have enough reserve to start loads like a big aircon. You will end with 20kW available for starting during the 10sec of 2x normal output. Not sure what loads one would leave on the 2 non backup phases. Yes, I recognise that but... He wants to 'set and forget', doesn't care whether his geyser and oven is off during loadshedding (he has a gas hob) and isn't concerned about powering the non-essential side with the excess PV (rather wasteful in my opinion but, and I quote "I don't want to fiddle about with this stuff, I just want the system to stop tripping when they switch on lots of stuff at the same time" - what you gonna do Interesting: Co-Pilot AI says that two phases can be connected to paralleled inverters as per below - has anyone here done this? Quote When connecting an inverter to just two of the three phases in a three-phase system, there are some considerations: Inverter Type: Ensure that your inverter is designed for single-phase operation. Some inverters can operate in both single-phase and three-phase modes. Wiring Configuration: Connect the L1 (phase 1) output of the inverter to one of the live phases (either L1, L2, or L3). Connect the L2 (phase 2) output of the inverter to the other live phase. Leave the third phase (L3) unconnected. Neutral and Ground: Connect the neutral (N) terminal of the inverter to the system’s neutral. Ensure proper grounding by connecting the ground (PE) terminal of the inverter to the system’s ground. Functionality: With this setup, the inverter will supply power to the connected phases (L1 and L2). The third phase (L3) will remain unaffected. Load Distribution: The load will be distributed across the two connected phases. Make sure the load is balanced to avoid overloading one phase. Remember to consult a qualified electrician or engineer to ensure proper installation and compliance with safety regulations Edited February 14, 20242 yr by AfricanTech
February 14, 20242 yr 29 minutes ago, AfricanTech said: Yes, I recognise that but... He wants to 'set and forget', doesn't care whether his geyser and oven is off during loadshedding (he has a gas hob) and isn't concerned about powering the non-essential side with the excess PV (rather wasteful in my opinion but, and I quote "I don't want to fiddle about with this stuff, I just want the system to stop tripping when they switch on lots of stuff at the same time" - what you gonna do Interesting: Co-Pilot AI says that two phases can be connected to paralleled inverters as per below - has anyone here done this? We must just make sure this does not relate to US power where they use 2x120V split phase systems. Hope our experienced installers can add their input. I thought that 2 in parallel would operate on 1 phase only. The big aircon can perhaps snooker a put and forget system if concurrent loads are not taken note of.
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