Inverters

uk1

uk1 said:

Many thanks.  I’m still going around in circles a bit so hoping for clarity.  Yes it is a single south facing array. 

My understanding is that the larger 5k Solis inverter can be set using a ct clamp which is an export limiter but because it is a 5k inverter it needs G99.  Is that incorrect?

https://www.segen.co.uk/product/solis-5kw-s6-dual-mppt-single-phase-with-dc/

• Maximum string input current 14A
• Easy installation: Integrate with export power control function and DRM function.
• Max. Efficiency over 97.7%
• Wide input voltage range for better generation and low startup
• Dual MPPT design with precise MPPT algorithm
• Export Limitation built in – Requires CT clamp (sold separately)
• Integrated AFCI (DC arc-fault circuit protection)
• Warranty: 5 years (option to extend to 10 years.)
• Startup Voltage:  60V

Just a bump in the hope that someone has the answer to this G98/G99 conundrum.

Thanks.

ABrass

G100 is instead of G99 or G98. You only need your installer to do one of those.

If your inverter cannot physically produce more than 3.68kW it is a G98 form.

If it can generate more, but is going to be restricted to only ever export 3.68kW then it is a G100 application, which is nearly certain to be approved.

If it can generate more, and you do want to be allowed to export up to your system limit, then it is a G99 application. That might be approved, or they might tell you you can only export a bit more than 3.68kW (eg. if you install a 10kW array they might let you export up to 6kW). Or they might insist on it being limited to 3.68kW.

I am not a MCS or DNO expert.

powerful_Rogue

Sorry to jump in this thread, but a pretty similar question so thought best to keep it in one place.

6.5kwh panels, 6kwh solar edge inverter. Battery side 6.5kwh battery with a 3kwh inverter. Does that mean that say in the vening when i'm using the batteries, if the over and kettle go on together and the spike draw is 3.5kwh, only 3kwh will come from the battery and the rest fromt he grid?

uk1

ABrass said:

G100 is instead of G99 or G98. You only need your installer to do one of those.

If your inverter cannot physically produce more than 3.68kW it is a G98 form.

If it can generate more, but is going to be restricted to only ever export 3.68kW then it is a G100 application, which is nearly certain to be approved.

If it can generate more, and you do want to be allowed to export up to your system limit, then it is a G99 application. That might be approved, or they might tell you you can only export a bit more than 3.68kW (eg. if you install a 10kW array they might let you export up to 6kW). Or they might insist on it being limited to 3.68kW.

I am not a MCS or DNO expert.

Thanks …. very much appreciated.

Does this mean then that the MCS installer will not set an install date until he gets G100 approval?

ABrass

powerful_Rogue said:

Sorry to jump in this thread, but a pretty similar question so thought best to keep it in one place.

6.5kwh panels, 6kwh solar edge inverter. Battery side 6.5kwh battery with a 3kwh inverter. Does that mean that say in the vening when i'm using the batteries, if the over and kettle go on together and the spike draw is 3.5kwh, only 3kwh will come from the battery and the rest fromt he grid?

I wouldn't buy that system as a new installation. Why not integrate the battery and the inverter?

But yes, the battery inverter could only provide 3kW at a time. Even if the inverter for the battery was larger then it will be limited by the battery's ability to supply power. My 6.5kWh battery can only supply 3kW of power.

I don't know how that system would fall in DNO terms. Probably a slightly more complicated G99 if it's all being installed at once, or a G99 and G99 fast track if the battery is going in second.

ABrass

uk1 said:

ABrass said:

G100 is instead of G99 or G98. You only need your installer to do one of those.

If your inverter cannot physically produce more than 3.68kW it is a G98 form.

If it can generate more, but is going to be restricted to only ever export 3.68kW then it is a G100 application, which is nearly certain to be approved.

If it can generate more, and you do want to be allowed to export up to your system limit, then it is a G99 application. That might be approved, or they might tell you you can only export a bit more than 3.68kW (eg. if you install a 10kW array they might let you export up to 6kW). Or they might insist on it being limited to 3.68kW.

I am not a MCS or DNO expert.

Thanks …. very much appreciated.

Does this mean then that the MCS installer will not set an install date until he gets G100 approval?

I don't know on that one, I believe the process is to get a pre-approval which is pretty fast, followed by a full approval once the system is installed.

The DNO can insist on a review of the system but tends no to do that often.

powerful_Rogue

ABrass said:

powerful_Rogue said:

Sorry to jump in this thread, but a pretty similar question so thought best to keep it in one place.

6.5kwh panels, 6kwh solar edge inverter. Battery side 6.5kwh battery with a 3kwh inverter. Does that mean that say in the vening when i'm using the batteries, if the over and kettle go on together and the spike draw is 3.5kwh, only 3kwh will come from the battery and the rest fromt he grid?

I wouldn't buy that system as a new installation. Why not integrate the battery and the inverter?

But yes, the battery inverter could only provide 3kW at a time. Even if the inverter for the battery was larger then it will be limited by the battery's ability to supply power. My 6.5kWh battery can only supply 3kW of power.

I don't know how that system would fall in DNO terms. Probably a slightly more complicated G99 if it's all being installed at once, or a G99 and G99 fast track if the battery is going in second.

Already paid the deposit and the G99 has been applied for. Gone for solar edge due to shading issues.

ABrass

powerful_Rogue said:

ABrass said:

powerful_Rogue said:

Sorry to jump in this thread, but a pretty similar question so thought best to keep it in one place.

6.5kwh panels, 6kwh solar edge inverter. Battery side 6.5kwh battery with a 3kwh inverter. Does that mean that say in the vening when i'm using the batteries, if the over and kettle go on together and the spike draw is 3.5kwh, only 3kwh will come from the battery and the rest fromt he grid?

I wouldn't buy that system as a new installation. Why not integrate the battery and the inverter?

But yes, the battery inverter could only provide 3kW at a time. Even if the inverter for the battery was larger then it will be limited by the battery's ability to supply power. My 6.5kWh battery can only supply 3kW of power.

I don't know how that system would fall in DNO terms. Probably a slightly more complicated G99 if it's all being installed at once, or a G99 and G99 fast track if the battery is going in second.

Already paid the deposit and the G99 has been applied for. Gone for solar edge due to shading issues.

Solar Edge do hybrid inverters. I think they're called StorEdge. Deposits can be refunded.

powerful_Rogue

ABrass said:

powerful_Rogue said:

ABrass said:

powerful_Rogue said:

Sorry to jump in this thread, but a pretty similar question so thought best to keep it in one place.

6.5kwh panels, 6kwh solar edge inverter. Battery side 6.5kwh battery with a 3kwh inverter. Does that mean that say in the vening when i'm using the batteries, if the over and kettle go on together and the spike draw is 3.5kwh, only 3kwh will come from the battery and the rest fromt he grid?

I wouldn't buy that system as a new installation. Why not integrate the battery and the inverter?

But yes, the battery inverter could only provide 3kW at a time. Even if the inverter for the battery was larger then it will be limited by the battery's ability to supply power. My 6.5kWh battery can only supply 3kW of power.

I don't know how that system would fall in DNO terms. Probably a slightly more complicated G99 if it's all being installed at once, or a G99 and G99 fast track if the battery is going in second.

Already paid the deposit and the G99 has been applied for. Gone for solar edge due to shading issues.

Solar Edge do hybrid inverters. I think they're called StorEdge. Deposits can be refunded.

Thanks, i've dropped the company an email to see whether it would be possible to change to a hybrid inverter.