Battery cutoff at 4% no mains but lots of sunshine

There is certainly one way of learning what I dont know about my recently installed all in one.

After yesterday’s storm our battery held up most of the night but shut down at 4%. We now have brilliant sunshine but our inverter is not doing anything. Are we basically stuffed until the grid supply returns or is there anything that I can do to get the inverter on and the battery recharging? Our network connection is via our Bt hub which is without power.

brinmcallister yes, I think you're stuck until the grid comes back.

For future reference you might want to stop the AIO discharging at say 10-15% - so there's still power in the system for the follow day when the sun comes up.

As for the broadband, you can setup a mobile hotspot on your phone (assuming you have a phone that offers that feature). Name the hotspot the same as the broadband router and use the same password. Hopefully that will allow you to talk to the inverter.

TX200 many thanks for the response. I will have a look at doing this.

Sounds like a nightmare, @brinmcallister !

Food for thought here, especially for those of us using wired networking.

How's this for a storm protocol:

• in advance, move battery reserve limit to 75%
• when power cut hits go and turn off everything obvious, reduce battery reserve limit to 4% and ...
• ... move battery cut-off limit to 10%
• when SoC hits 20% (or it's sleep time) turn off router UPS, and possibly all ring main circuits in CU, leaving light circuits on
• wait for sun to shine
• turn on router UPS + wait for network to come up
• move battery cut-off limit to 4%; check inverter has come up
• wait for SoC to rise, then turn on freezer and charge UPS etc
• if SoC falls back to 20% repeat from reducing battery cut-off limit step

The thinking of 20% is that the AIO has consumption of 100-150W in normal operation (same in Island Mode? - no idea). Assuming 13.5kWh capacity then 16% (so 20%-4%) gives 2.15kWh, which should last at least 14 hours.

Does that work?

Does the AIO not go to sleep when it’s not got solar input and in a low charge, then keep trying once daylight hours start?

kram the sun has been shining all day and nothing has changed. I’ve just emailed my supplier so hopefully we can get to the bottom of this quickly. Our mains is due to come back on later this evening. It appears that two poles on the overhead supplying this area have snapped. We have been luckier than many others so I’m not too frustrated with this yet.