Stick to existing plan better. Less headache and less uncertainty.

No damage. Coz manage to boost export dy to match import.

Selco with atap isn’t that bad. Coz the price has dropped for battery.

I don’t recall Bess will be 6years in my calculation. It’s about 7.5-8 years. Coz the saving really fluctuates especially when u have afa. Maybe in best case scenario it will be 7 years. Or if u do those diy stuff with cheaper parts.

For battery, a 32kwh battery will theoretically provide 960kwh at night. But after factoring 90% DOD, it’s only about 860kwh, and also there are days when you ar unable to fully charge due to low production. In good months for example, there will be 15% - 20% of the days when u get lower than expected yield and unable to fill up ur battery. This hasn’t include the conversion efficiency which will eat up a few more kWh along the way.

Plus, if battery is fully charged by noon on good days, all those extra generation will only be paid 20cent (if under atap) or go to waste if not under atap.

Then we have negative afa on certain months. Electricity tariff is lower with the new calculation, so it will also drag the ROI a bit too.
For example, in the past , the before solar and after solar bill has a bigger difference, but even under nem, the gap narrow a bit.

The good thing about the Bess is the possibility to get the eei incentive as the import is lower significantly compared to nem.

The best scenario for ROI will be those with over 1500kwh usage, and with the system will be able to reduce the import figure to just a few hundreds units. If your bill is around this usage, then it’s possible to have quicker ROI as what u mention, (6years).

I would think 6 years is always on paper. Expect some delay in ROI coz lots of factors might affect it unlike nem, which is quite straight forward.

It’s not that straight forward. Coz you can’t total the 100kwh jsut like that. It’s on daily basis. If you have more days of lower generation, expect to be hit with higher bill. A 100kwh could be just due to 3 day low yield but also it can be due to 6-7 days of low yield. This could also affect.

To achieve 500 saving, it would be easier if usage is above 1500kwh, coz ur bill before solar is based on 37 cent per kWh excluding other charges instead of 27 cent. This is also one thing that can speed up the real ROI.

Going solar has been a long term commitment. Even under nem, it’s about 5-6 years. So Bess at 7 years is very acceptable. Who doesn’t want free solar setup and battery from Tnb right? Instead of jsut paying for electricity.

This post has been edited by bee88: Oct 30 2025, 07:39 AM

He’s using Shelly iinm u can do that if u want. But not really necessary info for nem users. Good for tinkering around though.

No.