Adding this to my “want, but never will have” list, to be used as PV storage using Dala’s battery emulator https://vivnevs.com/products/62kwh-nissan-leaf-battery-pack-180ah-catl-lithium-battery-for-leaf-battery-upgrade
Home-assistant automation to pause solar battery charging
Created a Home-assistant automation to pause the solar battery charging at ~80% and only charge it to 100% at the last possible moment. This is to minimize time spent at full charge, which apparently is bad for the battery. It considers the estimated remaining PV production.
BYD 7.68kWh LiFePO4 solar battery
Data collected over nearly two years shows our BYD 7.68kWh LiFePO4 solar battery operates at an average of 94% efficiency (charged vs discharged). Capacity degradation is at 2%
Inverter and battery firmware update time
Inverter and battery firmware update time..
Old Nissan Leaf battery
Got this in case an old Nissan Leaf battery decides to show up at home
Old Nissan Leaf batteries to a Fronius GEN24 inverter
Thought I was done with solar system spending, but then someone develops a way to connect old Nissan Leaf batteries to a Fronius GEN24 inverter. Now remains to make a compelling case for this new budget dent to my better half. https://github.com/dalathegreat/BYD-Battery-Emulator-For-Gen24 Repeating in my head: "want != need"
3.7V Li-ion 14650 1100-1500mAh with welding pads
Does anyone know where can one buy a battery like this in the EU? It is a 3.7V Li-ion 14650 1100-1500mAh with welding pads.
55kWh Tesla Model 3 battery with Fronius GEN24 solar
Dala's EV Repair managed to configure and use a 55kWh Tesla Model 3 battery with @froniussolar GEN24 #solar inverter. That opens new options for EV battery repurposing after their useful life. https://www.youtube.com/watch?v=-s7lODLDOiQ&ab_channel=Dala%27sEVRepair
Node-Red dashboard to control the BYD PV storage battery
Node-Red dashboard to control the BYD PV storage battery behavior over Modbus TCP. Storm is coming and power failure is likely? No problem, force-charge the battery, including from grid, and put it on hold for emergency power backup purposes. Neat 🙂
BYD battery automatic switchover box
Now that the BYD battery is here, I finished the automatic switchover box. It physically disconnects the house from the grid and instructs the inverter to start in island mode. Upon grid availability again, the inverter monitors its stability and switches back to grid-tie mode. First time building such a distribution box, I realize the…
Depth of Discharge for my PV system’s BYD 7.7kW LFP battery
What is a reasonable Depth of Discharge % for my PV system’s BYD 7.7kW LFP battery,so to maximize its longevity? Should I keep SoC between 20%-80% e.g. 60% DoD?The inverter default battery SoC limit configuration is 5%-100%, but 95% DoD feels like it would be bad for the battery
BYD_BatteryBox HVS 7.7kW battery for my solar system
The @BYD_BatteryBox HVS 7.7kW battery for my solar system arrived today, the order took five months. Installed it myself, that took less than two hours. Still need to put the cables into a channel. All worked right away, slightly surprised 🙂
SAMD21+RFM95 on a 1400mAh battery
Experimenting how many #LoRaWAN messages (20 bytes payload that includes battery reading and internal CPU temperature @ SF7) can a SAMD21+RFM95 send on a 2000mAh Li-Polymer battery. Currently at 23392 messages, and battery is at 3.826V (80% full).. aiming at 120K messages. #IoT Si it died today at 68323 transmission. The battery is 1400mAh, not…
Solar harvesting LiPo chargers
Just ordered one of @jrsikken's Solar harvesting LiPo chargers, looks promising https://www.tindie.com/products/jaspersikken/solar-harvesting-into-li-ion-battery/
Low cost, battery powered temperature and humidity node
Thinking about creating a low cost, battery powered temperature and humidity #LoRaWAN #IoT node with always on LCD like this:
Wireless and battery powered bistable relay IoT node
Wireless and battery powered bistable (latching) relay IoT node with practically unlimited standby listen time. Relay is rated 16A/230V. Controlled by ESP32+RFM69 gateway (WiFi, MQTT). What practical usecases for this can you think of?
Wireless battery temperature and humidity sensor revision
This is my latest wireless battery temperature and humidity sensor revision. It is optimized for long range (200m) and long life (2+ years sending once a minute). To be used with the display hub and relay actuator I tweeted recently #IoT #smarthome
Battery-free sensor tag gathers energy from radio
Battery-free sensor tag gathers energy from radio frequencies https://www.engadget.com/2019/01/15/wiliot-battery-free-sensor-tag/ via @engadget
LiPo batteries for an upcoming ESP32 e-paper display project
LiPo batteries for an upcoming #ESP32 e-paper display project arrived
Low power battery operated IoT nodes
Few photos from my tech talk on "Building low power battery operated #IoT nodes", thanks to those that attended
Battery operated wireless temperature sensor node code
Heavily revised my old battery operated wireless temperature sensor node code, achieved 15% lower current consumption footprint.. #IoT
Ultra low power status display for battery operated
Working on ultra low power status display for battery operated wireless temperature sensor #IoT
CR2032 battery discharge pattern
9 months and 10 days on one CR2032: the discharge pattern of a coin cell powering a Funky v1 + DS18B20 room temperature node.
Wireless body temperature monitor/logger
A wearable wireless body temperature monitor for sick kids – remote logging plus a bedside status display with an alarm.
The WorkerB!
Meet the WorkerB! – the ATmega32U4 + nRF24L01 board gets a name and 5 test PCBs, its job is to collect and transmit data.
7 months of sending and still going
7 months on the same CR2032 and the Funky+DS18B20 room temperature node is still transmitting – live chart included.
Logging manualy entered values to emonCMS using keypad
Logging body weight to emonCMS with a keypad and a coin-cell Funky v2 – punch in the scale readout, get a weight history graph.
Running on ‘dead’ batteries
Running Funkys on ‘dead’ AA batteries – the LTC3525 boost keeps them alive down to 0.8V, squeezing out a second life.
New ATMega32U4 board to use with nRF24L01
A new ATmega32U4 board for the nRF24L01+ – USB, 8MHz/3.3V, and a boost regulator that runs the whole thing off a single AAA battery.
73062 transmissions with the Funky v2 low-power code and CR2032 battery
73062 transmissions from a Funky v2 on one 220mAh CR2032 – the low-power code held up until the battery finally quit.
Funky v2 low power example
My consolidated Funky v2 low power example sketch – 0.04mA sleep current, enough to run the ATmega32U4 node off a CR2032.
More “Gotchas” on the LDO regulator issue in Funky v2
More MCP1703 gotchas: the LDO leaks current backwards through its output when running the Funky v2 from battery – MCP1700 doesn’t.