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RicoT
post Jul 17 2024, 10:41 PM

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QUOTE(alvintcn @ Jul 17 2024, 10:26 PM)
I just installed a system with capacity of 9.7kwp, 16 panels with 4 micro inverters. But found out that the rated power of the micro inverters are 1.8kw. So, theoretically the 4 micro inverters should be able to generate 7.2kw max. If yes, then it means that I can never reach the 9.7kwp installed capacity. Is my understanding correct?
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There is a minimum PV input voltage for the inverter to start generate electricity. Usually will oversize a bit.
RicoT
post Oct 30 2025, 08:10 AM

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First thing to do now is to install a power meter with data logging. After checking your hourly usage, you know your house hourly electricity usage and day-night use distribution. Then, you can size your solar and BESS accordingly.

Something to take note:

Energy import and export are calculated separately for each phase, not as a combined total across all three phases.

Example:

Phase A consumes 3 kWh

Phase B generates 2 kWh

Phase C generates 2 kWh


This is not treated as a net export of 1 kWh (3 − 2 − 2 = −1 kWh) ❌.
Instead, TNB records it as 3 kWh imported and 4 kWh exported ✅ — calculated per phase.

These values are then accumulated over the month and reflected in the billing cycle.

user posted image

This post has been edited by RicoT: Oct 30 2025, 08:15 AM
RicoT
post Oct 30 2025, 04:12 PM

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QUOTE(backspace66 @ Oct 30 2025, 09:26 AM)
Half hourly consumption is available in mytnb website but of course not in real time, but you get the historical data there

As to minimize the issue of importing in one phase but exporting in the other, this is where the inverter with load balancing feature play a significant role. It can be optimized to prioritize self consumption. I am mainly using only phase A and sometime phase b and c except when i charge my ev using a 3 phase charger

user posted image

The system always prioritize self consumption and adjust the output on each phase based on demand. The graph above is showing current output from the inverter itself.
The graph below shows when there almost zero usage except for the fridge and some small consumption from multiple cctv and ups
All output spread evenly among 3 phases

user posted image
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Which Huawei inverter model you are using?

user posted image

Did you install the Huawei power meter together?
RicoT
post Oct 30 2025, 08:03 PM

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QUOTE(backspace66 @ Oct 30 2025, 04:50 PM)
Huawei sun2000-8k-mapo coming with compatible ct meter that can communicate with huawei inverter

The system optimizes self consumption based on demand and also to run zero export rule if required
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My installer says the power meter cost 1.6k.
RicoT
post Oct 31 2025, 07:58 AM

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QUOTE(backspace66 @ Oct 31 2025, 07:23 AM)
I saw someone installed diy using chint dtsu66-hw from nem group in fb, iirc it is around rm600(shopee) for 3 phase, should be just a small fee even of you ask electrician to do the wiring.

Btw these are compatible list, but only some model support zero export
https://support.huawei.com/enterprise/en/do...the-smartlogger
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Thanks for the reference. Since I am NEM, perhaps I want to try to maximise daytime selco rather than export. This load balancing feature seems useful, especially I have an EV charging during day time. Can you share the NEM FB group?

This post has been edited by RicoT: Oct 31 2025, 07:59 AM
RicoT
post Dec 4 2025, 07:47 AM

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QUOTE(backspace66 @ Dec 1 2025, 12:58 PM)
user posted image

From 4 peak sun hour to 3.3 peak sun hour for month of november.
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user posted image

Same trend but different sun hour

 

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