this morning, while on vacation i woke to 92% battery charge on my 955 Solar at 6am. i went for a 60min run with very little solar (overcast and sun just coming up) with All Satellites and it dropped to 90% and almost immediately to 89% just at about 7:30am.
i then spent a couple hours packing up in the hotel, and the rest of the day out and about in both overcast and sunny conditions, walking, eating lunch outdoors, and then driving home with apparently sun on my watch most of the way. (10:30am-5pm)
i am now at 7:45pm and it still is showing 89%. that's pretty incredible. (i didn't ever see it go to 90%, but it stayed at 89 through the whole day while out and about and driving) i was using Minimum vertical 2 today with several fields including body battery, solar intensity, HR, steps, activity minutes showing.
this is far from my typical use case (sitting in an office all day or riding in a train so getting very little solar on a typical day except a little sun when i run early morning), but it shows how Solar could provide a real boost during my backpacking trips when i will see significant sun.
i'm very impressed and now convinced i made the right choice in going for Solar. (i chose the Solar model t for the novelty and as a way to break up the appearance the big bezel)
[also, other data: i charged it to 100% at 11am on Friday, it fell to 99% at about 12:30 (probably because i didn't really let it get to a full 100% charge but pulled it right when it showed 100%)...but it's amazing to see that even with the 60 minute run (~3%) , FlipStone's awesome widget showing an estimated battery endurance of 21.5 days (-11% in 2.4 days, and 19.1 days left).
