Search results

I need a cell balancer for a three separate 48 volt banks of 8 series 6v lead carbon batteries; these are 300 AH sealed gel batteries and are proving difficult to get 100% balanced; once in a balanced condition, they will probably remain in that state and require little intervention. Another...

Here is a basic design for a PWM type PV solar charge controller, using a Picaxe 08M2. Ideal for smaller 30W panels charging a 10AH or so lead acid battery. I have a number of projects coming up that require small panels hooked up to various size 12 volt gel or Lifepo4 batteries, in stand alone...

Here is a small Mppt charger designed specifically for 12 or 24 volt batteries, I wanted a minimal system fitting on a 100 x 100mm pcb that will handle a PV panel up to 150-200W and voltages of 70 volts or so. Thought it may be of interest to some members here, components are getting very hard...

Have just completed a similar controller design using the PI Pico; however the Picaxe 28X2 cpu will also work well here, so spent a couple of hours re-arranging the pcb and schematic for the 28X2 as it maybe of interest to some members here. It is a smaller design than I would normally use and...

I have a collection of 40AH Lifepo4 cells removed from a 100V bank, some of the cells are at the end of their life and start to swell whenever they are charged, many are ok with approx 50% capacity but definitely on the way out. So I am going to build up a number of 28V (8 cell) banks and use...

I came across a great new half bridge driver chip that has user set dead-time and only requires a single PWM input; its the Silicon Labs Si823H4BB-IS1. The chip also has internal input isolation, so is fully isolated from the cpu and its low level control signals, making it a great candidate for...

While waiting for the 14M2 charge controller pcbs to come back, decided to do an upgrade to the design using the 20X2 chip, gathering the best features from previous designs to hopefully make a better controller. Using the 20X2 allows for 64 Khz pwm and extra capability; the higher pwm frequency...

I want to send data to some shift registers using the hspi - sdo pin C.1 on a 20X2 chip, I dont care about the sdi input B.5. Reading the manual is a rather vague about the subject, saying the sdi port has to be in the correct state in order to send data out, without actually saying what state...

I need something to startup our solar powered water pumps in the mornings as the sun come out. The magnetic drive pumps will be direct connected to a PV panel approx 50 - 180W and run continuously as long as the sun is shining, some run off 24v and others 12v dc; each voltage type has its own...

This is an updated bigger brother variation of the 08M2 design; after starting the build of the old 14M2 design, decided to augment it for a higher current and voltage rating. Most of the circuit is the same except for an additional large low esr input capacitor, use 2 buck mosfets in parallel...

I am setting up an irrigation control system for a large commercial garden, initially there will be 10 or so solenoid valve controlled water lines that run sprinklers etc. Most commercial controllers use AC systems with 22vac control signals activating solenoids; as our site is totally off grid...

Have been building solar PV charge controllers for many years, thought this project may be though provoking for some readers on this forum, designing an ultra basic controller using a 08M2, usually I post all my projects on "TheBackshed" forum and will continue to so so as they allow more images...