Mike's (non-Sunsynk) System

Mzezman said:
yeah finding time these days is insane. Where did you find stock btw? I cant find anything online
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For me stock wasn't the issue, price was. Tried a few places and SA came in cheapest at around R60k installed. Since it's not on their site, I had to call them to get a quote and they ordered it for me...
 
Mike Hoxbig said:
For me stock wasn't the issue, price was. Tried a few places and SA came in cheapest at around R60k installed. Since it's not on their site, I had to call them to get a quote and they ordered it for me...
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Any reason they don't have the 48100s listed anymore?
 
Mike Hoxbig said:
Yeah it's quite a bit more than we paid. But probably about par at current prices.

Just got a nice little surprise call that the installation is bumped up again to tomorrow...
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Excited... keen to see your improved production
 
wingnut771 said:
Are the cables longer to the busbar from the batteries on the ends?
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Nope all cables are the same length, even the ones closest to the busbar.
Mzezman said:
so much peace of mind... most impressive. congrats man
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Thanks. Yeah I'm going to put it through its paces over the next few nights. One of the bigger reliefs is also now the load can draw up to 9.6 kW from batteries only, so my wife can't keep tripping things during LS...
 
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Mike Hoxbig said:
Nope all cables are the same length, even the ones closest to the busbar.

Thanks. Yeah I'm going to put it through its paces over the next few nights. One of the bigger reliefs is also now the load can draw up to 9.6 kW from batteries only, so my wife can't keep tripping things during LS...
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don't formally issue that challenge to her please... :ROFL:
 
Mike Hoxbig said:
Nope all cables are the same length, even the ones closest to the busbar.

Thanks. Yeah I'm going to put it through its paces over the next few nights. One of the bigger reliefs is also now the load can draw up to 9.6 kW from batteries only, so my wife can't keep tripping things during LS...
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You're limited to 8kW by the inverter, so now your inverter will trip before the batteries trip
 
sjm said:
You're limited to 8kW by the inverter, so now your inverter will trip before the batteries trip
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The inverter can go above 8 kW without tripping, just not for sustained periods. Myself and others have had it spike to 10-11 kW before without tripping.

Some 0.5C batteries can briefly go above 0.5C. The problem is that the discharge current is hard governed by the inverter setting. If it goes beyond that then it trips.

Screenshot_2023-02-18-13-27-40-042_com.google.android.apps.docs.jpg

For eg a 0.5C 100 Ah battery would have a discharge current of 50A, 200 Ah would be 100A etc. You can set it higher to allow for a sudden spike, but I'm hesitant to do that to protect the battery. Didn't want to risk a higher sustained discharge current then it was designed for. Would rather deal with a battery tripping than a damaged battery...
 
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Mike Hoxbig said:
The inverter can go above 8 kW without tripping, just not for sustained periods. Myself and others have had it spike to 10-11 kW before without tripping.

Some 0.5C batteries can briefly go above 0.5C. The problem is that the discharge current is hard governed by the inverter setting. If it goes beyond that then it trips.

View attachment 1478279

For eg a 0.5C 100 Ah battery would have a discharge current of 50A, 200 Ah would be 100A etc. You can set it higher to allow for a sudden spike, but I'm hesitant to do that to protect the battery. Didn't want to risk a higher sustained discharge current then it was designed for. Would rather deal with a battery tripping than a damaged battery...
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How do you do that during loadshitting?
 
wingnut771 said:
How do you do that during loadshitting?
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Wasn't during LS. Just addressing the point that the inverter at 8 kW will trip before the batteries do at 9.6 kW.

With two batteries the max draw from the batteries was 4.8 kW and that's what caused the trip during LS...
 
Mike Hoxbig said:
Wasn't during LS. Just addressing the point that the inverter at 8 kW will trip before the batteries do at 9.6 kW.

With two batteries the max draw from the batteries was 4.8 kW and that's what caused the trip during LS...
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2 batteries can easily provide 8kW though or am I late in missing something?
 
Mike Hoxbig said:
Wasn't during LS. Just addressing the point that the inverter at 8 kW will trip before the batteries do at 9.6 kW.

With two batteries the max draw from the batteries was 4.8 kW and that's what caused the trip during LS...
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When grid is available you can draw up to the pass through current allowed by the inverter, irrespective of battery and PV capacity.

During LS you're limited to the lower of battery or inverter capacity. In your case, the inverter will only allow for 8kw, so it'll trip when that is exceeded even if the battery has spare capacity.
 
Speedster said:
When grid is available you can draw up to the pass through current allowed by the inverter, irrespective of battery and PV capacity.

During LS you're limited to the lower of battery or inverter capacity. In your case, the inverter will only allow for 8kw, so it'll trip when that is exceeded even if the battery has spare capacity.
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True, didn't factor in that pass through current wouldn't apply during LS...
 
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