Hey guys,
We recently did a little test (maybe a feature request) ? , we thought people might find amusing or maybe even informative.
Disclaimer: this is potential dangerous territory to be in, we do not suggest anyone does this at all, as we do not know all the dangers of doing this.
We have two off grid systems, one Quattro powered 90kwh lithium setup and a multiplus II 30kwh setup. There doesn't appear to be any simple way to share power
outside of using battery chargers powered by one system to feed the other, or do what offgrid garage has done and use one as a generator.
we already have AC coupled solar, so we decided why not AC couple them and have them share the load. We used MQTT to monitor the consumption on the house (quattro fed) and then set a negative grid set point on the multiplus to send power back (has to have ess installed) toward the loads on the house. (Before you mention it YES WE KNOW ITS A RISK, we did this under controlled circumstances, YES we know the cord has about 0.2sec where it could be live before the relay opens on the multiplus 2, we secured it before we did the test) .
The Grid set point was set to 1/3 of the consumption to the Van, the Van essentially took on 1/3rd of the load from the house.
Personally I'd like to see this added as a feature to Venus OS as it would help people to migrate from one system or chemistry to another over a protracted period of time.
Any we Blogged it and recorded it as usual – Given we have multiple systems if there is anything anyone would like to test but cant, we are open to suggestions for more videos to make, we quite enjoy this as a hobby so its no burden to us to have a crack at something (finances permitting)
Blog:
https://thisseemslikeabadidea.wordpress.com/?p=35&preview=true
Video:
https://youtu.be/XNRMLkSJdCk
