zhongfu's inane ramblings

Meow

What

having to manually balance a li-ion battery pack because life sucks or smth I guess

today's illegal electricity works: installing a power meter (Shelly Pro 3EM)

ft knockoff Wago terminal and bargain bin ferrules

beat saber is good cardio actually 👍 play beat saber thank

i plotted a crappy chart of an example:
- consumer using 2.5kW all day, every day
- they have some solar panels, peak is maybe 1.3kW, all of it goes to offsetting consumption

red line is total consumption, orange line is imported energy (kWh)

blue line is cost of consumption if everything was imported, light blue line is cost of imported energy (MYR)

green line is the "savings" (i.e. cost of total consumption - cost of imports)

so for example, if you're using a hair above 1500kWh every month...

you could buy some bargain bin solar panels and cheap grid-tie inverters to offset a bit of the consumption... and breakeven in as little as 2-3 months

wrote some shit in Home Assistant to parse tariff rates from TNB (especially the per-kWh "AFA" offset that changes monthly), and calculate the total bill amount for this month in real time

but the tariff structure isn't really progressive, which can lead to odd behavior for the "savings" number

for domestic, non-time-of-use consumers, the tariff structure is like this:
- energy cost: 0.2703 MYR/kWh if total usage <= 1500kWh, else 0.3703 MYR/kWh (on EVERY kWh)
- capacity charge: 0.0455 MYR/kWh
- network charge: 0.1285 MYR/kWh
- energy efficiency incentive: in tiers ranging from -0.25 MYR/kWh to -0.005 MYR/kWh (on EVERY kWh) if consumption is <= 1000kWh
- automatic fuel adjustment: varies from month to month, currently -0.0145 MYR/kWh (on EVERY kWh) if consumption is > 600 kWh

- retail charge: 10 MYR if total usage > 600kWh, else 0
- service tax: 8% on all charges that apply after 600kWh (i.e. energy/capacity/network/EEI/AFA charges on the 601st kWh onward, plus retail charge)
- RE fund fee: 1.6% on all gross energy charges (excl. AFA/retail charge)

this means that using 451kWh can cost you RM10+ more than using 450kWh in a month, despite the energy cost difference being just 50 sen

very nice, 77% of power consumption offset

one borderline horrifying soldering job later...

let's see if I can (successfully) add some funny wifi shit to my EV charger

the fucking sun keeps turning on and off wtf

two hours of unlicensed electrical work (on an eldritch horror of a distribution board) later, I have managed to shift substantially all of the idle loads to a single phase

goodbye, solar curtailment :))

not enough load to fully use up my solar power </3

hell yeah

(for some reason the actual produced power tops out at 62.75% of the configured limit, but I reckon the panel has a bit more to give)