Solar power died last night

My solar powered Sky reported as offline last night. The voltage curve took a dive around 230 in the morning local time.

Hello Mark

Have you taken down your sky and had a look at all parts , like water in battery compartment, corrosion somewhere … anything unusual

Also what is your station number so @wfsupport can have a look at raw data

I did a visual inspection of the device this morning, it looked good. We have not had any recent weather events in the past 2 weeks, so I did not take it down. Station id is 2062, taken from the URL.

I saw an abrupt drop in battery voltage at sunset last night, and by 230AM the system went offline.

weird, I see it is running now and voltage is going up so solar is charging or at least powering your sky. Does the gap coincide with night time and the start with day coming up ??? (I see your graphs with my time zone)
Also it was near 3.7V before it started to drop … I think it should cap at +/- 3.6V …
This might explain why it is starting to work again, solar panel works but for some reason the battery died.
You did take out the classic batteries when you installed the solar panel ?

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Yes, I removed the batteries from the device before installing the solar adapter. Sunset was at 20:00 PST Last Night. The first cliff drop is loss of daylight, the second seems to be loss of battery, and the device did rejoin this morning. We had some over cast until about 9AM PST. And that seems to fit the profile for a bad battery. The voltage behavior is what I have seen as well.

open a ticket with support

they’ll handle from here and get you new devices if confirmed

support via the website :

support via mail :


Remember the Sky sees the output of the SPA, not the SPA battery voltage directly, so the 3.7V doesn’t mean the battery is seeing that voltage. Theoretical 100% SOC of a LiFePO4 cell is 3.38V at toom temp. Of course limiting the terminal voltage to that means the cell will take for ever to charge.

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Piling onto an older thread, but this just happened to me - twice. Today. I’ve had my SPA for a while now, and about 1.5 weeks ago I moved my Sky to a more elevated position, but approximately the same distance from my hub. This morning the sky dropped out, and when it came back voltage was all over the place, very unlike the smooth changes I’ve seen over the past few months. Then it dropped out again. No water in the battery compartment, no corrosion. Water between the SPA and mount, but that’s it. Station 5448

Is it one of the field test units or a production unit? I’ve been wondering about my FT unit on SKY - Roof - FT on station 5075. Its voltage has been dipping below 3.2V rather quickly after the sun sets. SKY - Back Yard on the same station doesn’t drop as fast. It is a production unit.

It’s a production unit. I’ve started a ticket with support. I hadn’t noticed the sudden voltage drops until now.

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New SPA is on the way. Seriously weird, it just started acting funny, dropping out for no apparent reason. Customer service is off the charts with WF, kudos!