Tag Archives: Solar

Open Inverter, an open source micro-solar inverter


Ken Boak has been working on an open source micro-solar inverter project:

We wanted to make a design that uses readily obtainable N-type FETS and an Arduino (more strictly a ATmega328P-PU on a breadboard) to generate the PWM signals and provide simple circuit protection, and load sensing. With the PWM signals generated in firmware it can easily be modified for 50Hz or 60Hz operation, either 115V or 230V operation and a wide range of battery input voltages.
We imagined that the final design could consist of an Arduino, an “Inverter Shield” containing FETs and driver ICs configued in a H-bridge and some voltage and current monitoring circuits. To make the inverter a 12V or 24V battery (or PV panel) and a 12V (or 24V) torroidal transformer would be added.

Open Inverter, an open source micro-solar inverter – [Link]

Arduino based MPPT solar charge controller

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by Abid Jamal @ electronicslovers.com:

what is Mppt( Maximum power point tracking) ?
“we use MPPT algorithm to get the maximum available power from the Photovoltaic module under certain conditions”

How MPPT works ? Why 150W solar panel does not equal to 150 w?
For example you bought a new solar panel from the market which puts out 7 amps. under charge the setting of a battery is configured to 12 volts : 7 amps times 12 volts = 84w (P=V*I) You lost over 66 watts – but you paid for 150 watts. That 66 watts is not going anywhere, but it,s due to the poor match of the solar output current and battery voltage .

Arduino based MPPT solar charge controller – [Link]

Energy-harvesting power management ICs for wireless sensor nodes


by Graham Prophet @ edn-europe.com:

Cypress Semiconductor has introduced what it believes to be the lowest-available-power PMICs that enable an integrated module size of 1 cm² for solar-powered wireless sensor node (WSN) designs.

Intended to manage solar-powered wireless sensors for Internet of Things (IoT) applications, these parts are said to be the lowest-power, single-chip Energy Harvesting PMICs, and can be used with solar cells as small as 1 cm². Cypress offers a complete, battery-free energy harvesting solution that pairs the S6AE101A PMIC, the first device in the new family, with the EZ-BLE PRoC module for Bluetooth Low Energy connectivity, along with supporting software, in a $49 kit.

Energy-harvesting power management ICs for wireless sensor nodes – [Link]

Large area industrial crystalline silicon n-PERT solar cell with a record 22.5 percent efficiency


@ phys.org:

Nano-electronics research center imec announced today at Intersolar Europe, a new efficiency record for its large area n-type PERT (passivated emitter, rear totally diffused) crystalline silicon (Cz-Si) solar cell, now reaching 22.5 percent (calibrated at ISE CalLab). It is the highest efficiency achieved for a two-side-contacted solar cell processed on six inch commercially available n-type Cz-Si wafers without the use of passivated contacts.

N-type silicon solar cells are considered as promising alternatives to p-type solar cells for next generation highly efficient solar cells thanks to their ability to withstand light-induced degradation and to their higher tolerance to common metal impurities.

Large area industrial crystalline silicon n-PERT solar cell with a record 22.5 percent efficiency – [Link]

Logging harvested solar power using $15 Scorpion Board


by Pieter:

It’s undeniable that South Africa is experiencing a critical electricity crisis. On the positive side, it’s forcing us to conserve and consider alternative sources of energy. My mom sponsored our household with a cheap Chinese solar panel with battery pack and LED lights to use during load shedding (we live in Cape Town zone 6 and you can find the schedule here).

This made me wonder: how much solar power does this system harvest in one day? Enter my handy $15 Scorpion Board. I built a cheap current sensor board (using a Diodes ZXCT1051 low side current sensor IC).

Logging harvested solar power using $15 Scorpion Board – [Link]

6 Volt 5 Watt solar charge controller


Steve made this 6 volt 5 watt solar charge controller project, that is available at Github:

Here is a 6 volt 5 watt solar charge controller project using a dedicated printed circuit board from dirtypcbs.com and an Arduino pro-mini.
The board uses sot-23 low RDSon P channel mosfets (Si2369). It has voltage and current sensing, and 3 configurable switched or unswitched outputs.

Additionally, using a Bus Pirate you can grab charge controller voltages, currents, and other variables at 5 times a second using a Python3/tkinter program I wrote to go with this project. This program uses uses I2C to connect to the Arduino.

6 Volt 5 Watt solar charge controller – [Link]

See-through solar concentrator harvests energy from sunlight


by Amy Norcross @ edn.com:

A team of Michigan State University (MSU) researchers has created a transparent solar concentrator able to turn any window (or other sheet of glass, such as the screen for a smartphone) into a photovoltaic solar cell. What makes this development different? The panel is truly transparent.

Earlier attempts at building transparent solar cells resulted in panels with tinted glass and/or compromised visibility. Lead researcher Richard Lunt, an assistant professor of chemical engineering and materials science at MSU, says, “No one wants to sit behind colored glass. It makes for a very colorful environment, like working in a disco.”

See-through solar concentrator harvests energy from sunlight – [Link]

Solar self-rechargeable Battery


This is a prototype model Battery (type C ) for electronic devices. The battery has the ability to be recharged by the sun and don’t need any battery charger. It is necessary for climbers, explorers, soldiers, free camping and general for humans who attempt in areas without infrastructure electricity. The standard can also be applied to other types of batteries and the current technology allows their development with much greater energy capacity.

Specifications of the prototype:

  • Battery 1.2v 700 mAh
  • Solar cell 1.5v 70mA

Solar self-rechargeable Battery – [Link]

Raspberry Pi Solar Weather Station


by PiJuice @ instructables.com:

Spurred on by the completion of my two previous projects, the Compact Camera and Portable Games Console, I wanted to find a new challenge. The natural progression was an outdoor remote system…

I wanted to build a Raspberry Pi weather station that was able to sustain itself off grid and send me the results through a wireless connection, from anywhere! This project really has had its challenges, but luckily powering the Raspberry Pi is one of the main challenges that has been made easy by using the PiJuice as a power supply with it’s added solar support.

Raspberry Pi Solar Weather Station – [Link]

120A Solar BMS charger LiFePO4,Li-ion OffGrid,RV with WiFi


The NEW Solar BMS charger for LiFePO4 or any other Li-ion battery and used for OffGrid House, RV or boats, with wireless datalogging.

 Solar BMS (Solar Battery Management System)is a solar charge controller designed to replace the Lead Acid solar charge controllers most people use today in Offgrid, RV, Boats and multiple other applications with 12V and 24V systems. Solar BMS can be used with 3 up to 8 Lithium cells (any type) or supercapacitors. The new SBMS100 will have multiple improvements over the first generation SBMS4080 see further for details.

120A Solar BMS charger LiFePO4, Li-ion OffGrid,RV with WiFi – [Link]