Recent content by wattmatters

Have you asked Solar Assistant help?

https://hackaday.com/2017/08/17/living-on-mars-the-stuff-you-never-thought-about/#:~:text=In%20the%20case%20of%20Mars,build%20up%20different%20charge%20amounts.

Plug in an ethernet cable?

Use the backup feature: https://solar-assistant.io/help/historic-data/backup

I outgrew using my RPi4 for Home Assistant, it just didn't have the grunt, storage or backup capability I felt important as Home Assistant grew and became more important to our home's operation. I migrated to a mini PC using Proxmox to set up virtual machines, one of which is Home Assistant. I...

After runners eat, they fartlek.

The jokes here have taken a step down.

What EV has 200p? Most are 400 V and some 800 V architecture. How can they be 200p? You need 100 cells (or more) in series to get 400 V.

My EV's pack configuration is 104s1p. ~400 V architecture. NMC.

3.2 V/cell is the nominal voltage typically quoted for LiFePO4 chemistry and along with the Ah rating is used for estimating energy capacity. Actual operating voltage will of course vary.

Thanks but science it is not. Just data to be treated with due caution. Real science is far far more rigourous. I have 400 Ah of SLA @ 48 V so 0.1C is ~ 2kW so I think I'm fine on that front. The hybrid bank doesn't charge any faster than ~3.6 kW and that's while the LiFePO4 are taking the vast...

This is what's confusing about your posts. You talk about wanting "UPS" or outage back up: That's a use case where there is bugger all cycling. Hence why suggesting batteries designed specifically for that use case. The batteries sit there at float ready to supply energy when you need it. There...

I'm not convinced large vs small battery is much different from a fire risk POV. A devastating fire can be started with a match, it doesn't need a flame thrower. Most battery fires are caused by small battery failures, usually a charging fault because everything is made cheaply. And yes, the...

When I built a system purely for grid outage backup I went with pre-loved SLA data centre backup batteries (Enersys SBS 190F). Four of those for a 48 V system to begin with, then added another four in parallel later. That gave us about 12 hours of comfortable backup capacity, longer if we were...

Not really, prices are not really all that different here. I looked at DIY but frankly the server rack units I have I could not build DIY for much less, let alone the quality of construction and superior form factor. The small cost difference just wasn't worth it and I could get a battery...