laasrocket
New member
- Joined
- Nov 9, 2021
- Messages
- 6
Hi.
I just wanted to share this open source inverter project; https://github.com/jaw0/littlebox-power-inverter as I guess it could be of interest for some people here.
This pic shows the size and layout;
These are the specs descried in the repo which are inherited from the google little box challenge back in 2014;
Just ordered some pcb's to try to put one together myself. My idea is to mainly use it powered from the HV bus (about 405-320v) at a nissan leaf, but hopefully also powered from other sources. As I understand it could also be powered from lower voltage sources but probably with a quite poor efficiency, looking forward to investigate that at different voltages.
My other ideas are to look into syncing 3 pcs for 3phase output or maybe elaborate with adding some code for MPPT, maybe with some code/inspiration from this project;
View: https://www.youtube.com/watch?v=ShXNJM6uHLM
, as the topology seems to be similar to most standard transformerless grid tie inverters, with a boost converter and then an H-bridge.
Regarding the little box challange, there is a really interesting report, describing several of the approaches, difficulties and solutions the participants ran into, well worth a look, here;
Hope I can get back with some more info in a bit.
Guess I should also warn about lethal voltage/amp/power levels and clarify that I'm not the creator of the mentioned project.
I just wanted to share this open source inverter project; https://github.com/jaw0/littlebox-power-inverter as I guess it could be of interest for some people here.
This pic shows the size and layout;
These are the specs descried in the repo which are inherited from the google little box challenge back in 2014;
- Must be able to handle up to 2 kVA loads
- Must achieve a power density of equal to or greater than 50 W/in3
- Must be able to handle loads with power factors from 0.7–1, leading and lagging in an islanded mode
- Must be in a rectangular metal enclosure of no more than 40 in3
- Will be taking in 450 V DC power in series with a 10 Ω resistor
- Must output 240 V, 60 Hz AC single phase power
- Must have a total harmonic distortion + noise on both voltage and current of < 5%
- Must have an input ripple current of < 20%
- Must have an input ripple voltage of < 3%
- Must have a DC-AC efficiency of greater than 95%
- Must maintain a temperature of no more than 60°C during operation everywhere on the outside of the device that can be touched.
Just ordered some pcb's to try to put one together myself. My idea is to mainly use it powered from the HV bus (about 405-320v) at a nissan leaf, but hopefully also powered from other sources. As I understand it could also be powered from lower voltage sources but probably with a quite poor efficiency, looking forward to investigate that at different voltages.
My other ideas are to look into syncing 3 pcs for 3phase output or maybe elaborate with adding some code for MPPT, maybe with some code/inspiration from this project;
, as the topology seems to be similar to most standard transformerless grid tie inverters, with a boost converter and then an H-bridge.
Regarding the little box challange, there is a really interesting report, describing several of the approaches, difficulties and solutions the participants ran into, well worth a look, here;
Hope I can get back with some more info in a bit.
Guess I should also warn about lethal voltage/amp/power levels and clarify that I'm not the creator of the mentioned project.
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