Frnandu Martiński
Member
- Joined
- Mar 5, 2017
- Messages
- 101
Ok, let's start document this journey:
so my current status is that I mounted a bunch of sonoff powsaround the house to measure several stuff, and a SDM120 for the overall usage of the house, and with a small python script insert it into influx and visualize it on grafana:
Since I have 2 tariffs (night + weekends cheaper), I needed a bit of scripting to calculate according to the time and active tariff what is the cost per measured appliance and the total spent on the house.
So now I know exactly how much per month each of my loadscosts me. That's is quite nice feeling.
So, monthly the biggest consumption comes from the fridge (lodowka in polish , the water heater panels (solar), and computers+router+projector (media). And since these are all small loads, I want in the first step offload them into the powerwall with a small but efficientinverter.
I've been collecting laptop batteries for a few months and here's how my stats look so far:
I consider good cells above 1800mah (opus measured), BUT also if the capacity / original catalogue capacity is bigger than 80%. I hope by doing this I don't put into the powerwall cells which are near their end of life.
As you can see, it doesn't look too good.
I contacted every laptop service around, but the price is rapidly going up, so it's becoming more difficult geting good cells from used laptop batteries, at least here in Poland.
Either they want too much for them, or the cells are not good enought for the powerwall.
I still have around 70 laptop packs to open, hope the stats get a bit better.
I decied to buy directly from a ebike guy100x INR18650-29E unused(original capacity)for 1.42EUR/cell, to help me get to my first goal of 560cells for the 14s40p pack.
I recently bought:
3x260w solar panels (still not mounted, just testing laying in the grass).
pcm60x
And made my first hook up yesterday.
What an incredible feeling, seeing the juice flowing
I made a small 4s5p pack mainly to practise soldering and bus bars contruction and tested it:
But the pcm60x has a 15v limit, so it's time to go to the next step, which is build a 7s15p pack from my <1800mah cells and fromcells with life capacity < 80%. This will help me further practising soldering and building for the ultimate goal of the 14s packs.
Let's see how that goes. I'll try to give more updates as it goes allong.
Please comment, specially if it's advice or critiques, insults are also tolerable
I'de like to special thanks Peter for sharing his journey, and Daniel (daromer) for his incredible willto keep commenting and helping others. You guys are great!
Have sun
so my current status is that I mounted a bunch of sonoff powsaround the house to measure several stuff, and a SDM120 for the overall usage of the house, and with a small python script insert it into influx and visualize it on grafana:
Since I have 2 tariffs (night + weekends cheaper), I needed a bit of scripting to calculate according to the time and active tariff what is the cost per measured appliance and the total spent on the house.
So now I know exactly how much per month each of my loadscosts me. That's is quite nice feeling.
So, monthly the biggest consumption comes from the fridge (lodowka in polish , the water heater panels (solar), and computers+router+projector (media). And since these are all small loads, I want in the first step offload them into the powerwall with a small but efficientinverter.
I've been collecting laptop batteries for a few months and here's how my stats look so far:
I consider good cells above 1800mah (opus measured), BUT also if the capacity / original catalogue capacity is bigger than 80%. I hope by doing this I don't put into the powerwall cells which are near their end of life.
As you can see, it doesn't look too good.
I contacted every laptop service around, but the price is rapidly going up, so it's becoming more difficult geting good cells from used laptop batteries, at least here in Poland.
Either they want too much for them, or the cells are not good enought for the powerwall.
I still have around 70 laptop packs to open, hope the stats get a bit better.
I decied to buy directly from a ebike guy100x INR18650-29E unused(original capacity)for 1.42EUR/cell, to help me get to my first goal of 560cells for the 14s40p pack.
I recently bought:
3x260w solar panels (still not mounted, just testing laying in the grass).
pcm60x
And made my first hook up yesterday.
What an incredible feeling, seeing the juice flowing
I made a small 4s5p pack mainly to practise soldering and bus bars contruction and tested it:
But the pcm60x has a 15v limit, so it's time to go to the next step, which is build a 7s15p pack from my <1800mah cells and fromcells with life capacity < 80%. This will help me further practising soldering and building for the ultimate goal of the 14s packs.
Let's see how that goes. I'll try to give more updates as it goes allong.
Please comment, specially if it's advice or critiques, insults are also tolerable
I'de like to special thanks Peter for sharing his journey, and Daniel (daromer) for his incredible willto keep commenting and helping others. You guys are great!
Have sun