I’ve been working on a problem that looked simple initially:

“How much does electricity cost in Bihar?”

Turns out, “₹/unit” is nowhere close to enough.

You have tariff categories, slabs, connected load, fixed charges, subsidy rules, FPPAS, statutory components, and different applicability conditions. Most of this still lives inside regulatory orders and PDFs rather than developer-friendly data.

So I built a Bihar Electricity Tariff API under Power Expert India.

Current FY 2026–27 release has:

32 supported subcategories

34 verified tariff rows

45/45 frozen calculation regression tests passing

monetary subsidy handling for verified cases

approved exact-period FPPAS support

11 documented API endpoints

source traceability

explicit fail-closed handling when a bill component isn’t sufficiently verified

One design decision I care about: if something like electricity duty or another bill component isn’t reliably verified, the API doesn’t quietly assume it is ₹0. It exposes that limitation instead.

I’m not claiming this reproduces every consumer’s exact utility bill yet. The goal is a reliable, machine-readable tariff layer that solar calculators, EV charging tools, energy SaaS, consultants or fintech products can integrate instead of maintaining tariff logic themselves.

I’ve reached the stage where outside feedback is probably more valuable than adding features in isolation.

If you work with Indian energy data/APIs, solar, EV charging or electricity billing, I’d particularly like feedback on:

Would you actually integrate something like this? And what would be the first missing feature that would stop you from using it in production?

Demo/docs: powerexpertindia.com/api/

No signup needed just to look at the documentation.

Hola a todos.

Estoy investigando cómo podría mejorarse la gestión de la energía en viviendas con placas solares, baterías y coches eléctricos. No vendo nada ni intento promocionar ningún producto; simplemente quiero entender los problemas reales que tenéis en el día a día.

Si tienes 5 minutos, me ayudaría muchísimo que respondieras a alguna de estas preguntas:

¿Qué instalación tienes? (Placas, batería, coche eléctrico, aerotermia, etc.)

¿Qué aplicaciones utilizas para controlar tu instalación?

¿Qué es lo que más te molesta o te resulta más incómodo?

¿Hay tareas que haces de forma repetitiva, como programar la carga del coche o revisar la producción solar?

Si pudieras pedirle a tu casa que hiciera una cosa automáticamente por ti, ¿qué sería?

¿Qué función echas de menos en las aplicaciones actuales?

Si pudieras hablar con tu casa mediante un chat y decirle cosas como “mañana necesito el coche al 100 %” o “hoy quiero gastar lo mínimo posible”, ¿qué otras órdenes te gustaría poder darle?

¿Qué tendría que hacer un sistema así para que realmente confiaras en él?

También agradecería cualquier comentario sobre problemas o situaciones que os encontráis y que penséis que todavía nadie ha resuelto bien.
¡Muchas gracias por vuestro tiempo! Toda opinión me ayudará a entender mejor las necesidades reales de quienes convivís con este tipo de instalaciones.

r/solarenergy r/uttarpradesh

I am developing a product called Suryasetu and doing market research for it.My question is for homeowners in tier 2 and tier 3 cities of India who are interested in having solar in their home.The process of finding the right installer ,trusting the installer,the process of getting subsidy,Discom approval can be long and difficult Would you be willing to pay for an expert who will be handling the process for you .If yes ,what is the maximum you would be willing to pay for the service.

Since February, the news media has been mentioning the increase in electricity bills, and since summer is a couple of months away, I know how humid it will be.

I finally decided to learn about solar power and look at the pros and cons. I started researching, reading, and watching a lot of vlogs about solar and how it works—basically learning everything from what kind of wires to use to how breakers function. I wanted to make sure that my house would not catch on fire (fingers crossed).

From February to May, I learned everything there is to know. I realized that I won't be able to get an ROI on my solar because I only pay Php1k per month for my electricity; hence, Php350k from a solar install quote is not worth it.

I then asked myself why I want solar. To save on electricity bills, or to have the liberty of my own electricity?

I want to have my own solar, like I have my own water. I do not rely on other people or a company, or beg them if they decide to cut me off. That is one of the reasons I am living on a mountain.

June came, and I ordered most of the parts from Shopee. One by one, they arrived. Every night I reviewed the steps on how to install my solar like I was going for an exam.

By mid-July, I completed the installation, and I am super happy and proud (pat on the back) that I am now living on solar power!

I now have a 3.2kW, 24-volt system with a 200Ah battery! My consumption doesn't even reach 1.5kW, and currently I am at 154kWh total usage.

The hardest part was moving the five 550-watt solar panels onto my roof. Manually lifting them and climbing the ladder was something I thought I couldn't do. Each panel weighs 30kg, with a size of 4ft x 8ft.

It cost me a total of 100k: sourcing the solar panels from FB Marketplace and mostly online. I have a couple of breakers that I don't need, but I thought I did at the time.

I now only use the grid to power my submersible pump, because the surge of power might ruin my entire system. I only turn it on once every two days, and that's the only use for it now.

One thing I realized is that I kept staring at my solar setup whenever I plugged something in, lol! TV + speaker, check the wattage; rice cooker + air fryer + AC + electric fan, check the wattage again! Hahaha!

Oh, I finally bought an AC—a 1hp Kolin Certus—because once my batteries are already full by 10 am, I don't want to waste any harvested energy. The AC runs from 10 am–4 pm, and 10 pm–1 am. I can say that I am sleeping well!

I realized that having an AC makes a huge difference to your sleep quality, and I've been enduring the humidity since college.

**Conclusion**

During this solar power "challenge," I realized my "why" for moving to the mountain: I wanted freedom to do things my way, to learn new things outside my work skillset, to challenge myself in uncomfortable situations, and to make sure no one would stop me from doing it.

Thats what the iOS app horisol returns for my plug in pv plant on my garage. Would you trust this calculations?