HansT - To not overload my LifePO4 battery, I'd...
To not overload my LifePO4 battery, I'd like it to have a way to tell the system that I'm docked in the home marina and that therefor the LifePO4 charger should keep it ~60% charged.
Then, let's saya day before leaving for a trip, I'd like to set it to 'prepare for departure' and the charging should aim for 100%. Possibly cool the freezer, fill the tanks (watermaker), whatever else.
I forgot the consensus on what the approach should be.
14 Replies
You can setup a geofence in node-red
And/or a put handler to manually switch states
I would also reconsider the “not overload LifePO4”, this is not a concern, you can keep them at 100%
On 100% charge, My experience hasn't been that great with that. Also chatgpt seems to think it's not a great idea. Having a cell die on me during a 2 day solo trip wasn't a great experience 🙂
There’s definitely some debate, but I’ve seen no evidence that it’s a problem. I think it’s one of those things that got mistakenly carried over from other lithium chemistries.
Geofence I get, but that I'd be leaving with 60% battery charge, where I'd like it to be 100%. Auto state works fine, so I don't want to fumble there. Maybe not so much a 'boat state', but 'boat plan'.
Has not caused any issues for me.
You could definitely make a bool “switch” to turn on ‘prepare for departure’
But where to keep that state? Any suggestions?
Just make up a path in SK.
Ok - easy enough to change in the future if needed.
You can use disk storage in node-red to persist it.
I'm not using node-red yet, but I'll put that on my to-do list to get into.
Pretty perfect to do the things you want to do
Here's an example of a bool switch in node-red: https://github.com/SignalK/signalk-node-red/discussions/48
GitHub
A PUT handler that sets a node-red global variable · SignalK signal...
[{"id":"219b9c95.4e0d5c","type":"inject","z":"db137791.d0f408","name":"","props":[{"p":"payl...
Thanks!
i have large lithium bank on my house solar/energy storage system… (same Li technology as in my victons on boat)
from all the research ivevdone on solar forums etc … the only consensus seems to be that charging them to around 95% is a bit gentler on them (partic when they are cycled daily or more often) .. for which my battery system/solar charger allows this customisation..
… but ive never seen any views about keeping them at lower levels of SoC.