This repo is based on the great work from "mace" on Photovoltaic Forum:
https://www.photovoltaikforum.com/thread/209046-wvc700r3-mppt-regler-tauschen/
ATTENTION:
The instructions here in this repo are for educational purposes only. Very high voltages occur in the units. There is danger to life and body. The modifications may only be carried out by trained personnel. The modifications will invalidate all warranty claims and approvals such as certificates. We are not responsible for any damage. You are responsible for everything yourself.
INTRODUCTION:
The MPPT controller of the WVC inverters works rather moderately to poorly. Most of the time it gets stuck somewhere and the modules run in voltage ranges where you know that something can't fit.
This project fixes these problems with the inverter "WVC-700R3-Life".
The idea was to separate the existing processor from the switching converter. The necessary signals such as current, voltage, ZCD on the board to pick up and an own MPPT controller there to install.
A small AVR-MC which only does the MPP tracking.
The original main processor still does the monitoring and management.
OPTIONAL:
If you have trouble with wrong voltages and/or currents in your wvc-600 / wvc-700 inverter you can try the built-in, non documented calbrating function:
https://github.com/clatoverada/wvc700r3-life-better-mppt/wiki/Calibrate-Voltages-in-the-mobile-app
BILL OF MATERIALS:
1x ATTINY85-20PU (PDIP-8)
1x Ceramic Capacitor 100nF/50V axial (e.g.: KEMET C410C104M5U5TA7200)
1x Programmer for ATTINY85 Chips (e.g.: Sparkfun Tiny Programmer)
1x EPCOS B72220P3271K101
1x SMD Resistor 39K (SMD 0805)
1x SMD Resistor 8,2k (SMD 0603) (if you burned the original part) :-)
For more Information visit our Wiki:
https://github.com/clatoverada/wvc700r3-life-better-mppt/wiki
Have a look at https://github.com/mace-de/WVC for a complete custom Firmware directly flashable to the main controller without all that soldering stuff.