Anyone else finding the longer evenings make a massive difference to battery levels?

Absolutely noticed this in the van — it's like someone flipped a switch around mid-February and suddenly my Victron BMV-712 stopped showing that slightly grim face every morning.

Running a 200Ah Fogstar Drift lithium setup with 400W of solar on the roof, and through December/January I was genuinely rationing the diesel heater fan and being careful about the laptop. Not struggling exactly, but always aware of it, always doing that little mental maths before putting the kettle on.

Now though? Even with a couple of overcast days thrown in, I'm waking up to 85-90% state of charge rather than the mid-60s I was seeing in the depths of winter. The panels are actually doing something useful before 9am again, which feels like a genuine luxury.

The angle makes a difference too — I've got fixed flush-mounted panels which aren't ideal for low winter sun, so the combination of longer days and the sun sitting higher in the sky has basically doubled my effective harvest. Worth remembering for anyone still debating tiltable vs flush mounting.

Curious whether folk with north-facing setups or those parked under trees for shade are seeing the same improvement, or if it's more pronounced when you've got a clear southern aspect? Also wondering if anyone's noticed a meaningful difference between living somewhere like Cornwall versus Scotland — the variation in daylight hours this time of year must be quite significant.

@Davo51 Yes! On the narrowboat it's almost emotional — after months of rationing the kettle and watching the Victron display like a hawk, suddenly you're ending the day at 80% and thinking what do I even do with all this?

The real game-changer for me was actually the angle of the sun as much as the hours. February onwards the panels are finally hitting something meaningful rather than just skimming the horizon. My 400W Renogy array went from producing almost nothing useful to genuinely topping me up through lunch.

The flip side nobody mentions — you get complacent fast. I definitely left the diesel heater running longer than I should have last March because I thought "ah the solar will sort it" and woke up to a rather sulky battery bank. Stay sharp even when the sun's being generous! 😄

Interesting thread — can I ask what azimuth your panels are facing? I've been trying to work out whether the longer evenings are actually giving me usable harvest or just low-angle light that barely tickles the MPPT.

On my static van setup I've got panels fixed on a south-facing roof, and I'm noticing the evening gain is real but modest compared to the mid-morning improvement. The sun's just too low in the west by the time the evenings stretch out.

What I'm more curious about is whether anyone's seen a meaningful difference in EV charging viability from solar alone — that's my longer-term goal. At 200Ah+ storage, are people actually running an Ohme or similar through the day yet, or still too marginal?

@BlownFuse — on the shepherd's hut I've got panels split across two roof pitches, roughly SE and SW, which I initially worried about but actually works beautifully as the season turns. The SW side barely contributes in winter but comes alive around now, almost like a second system switching on.

What's striking me this year is how the quality of the light has shifted, not just the quantity. My Victron MPPT logs are showing proper absorption cycles completing before noon — that hadn't happened since September.

@Davo51 the "slightly grim face" description is painfully accurate. I use mine for emergency backup as well and there's something genuinely reassuring about watching those morning readings climb back into comfortable territory.

@BlownFuse — azimuth is worth obsessing over slightly less than people think, because the longer day length actually compensates quite generously for suboptimal orientation. On the boat I've got two 175W Renogy panels on a pretty compromised south-southwest aspect due to the cabin roof geometry, and from mid-February onwards the extended shoulder hours — that low-angle morning and evening light — genuinely stack up.

What matters more at this time of year is tilt angle. I dropped mine from the winter-steepened 55° back toward 35° last week and immediately picked up a measurable improvement on the Victron MPPT daily harvest figures. The sun's climbing fast now.

@IslandOffGrid's split SE/SW approach is actually rather clever — you're essentially broadening the harvest window rather than chasing peak noon output, which for battery management purposes is often more useful anyway.

@IslandOffGrid — same split-pitch setup on my hut, SE/SW. What I've noticed is that the SW side is now carrying its weight properly for the first time since October. Those late afternoon top-ups in spring are genuinely useful in a way they just aren't in winter when the sun's already low and going nowhere useful.

My Fogstar 200Ah LiFePO4 is sitting at 95%+ most mornings now versus the mid-70s I was scraping through January. Big psychological difference too — stops you second-guessing every kettle boil.

The real shift for me wasn't February though, it was when the clocks changed. Almost overnight the evening draw stopped biting into reserves as hard because there was still generation happening at 6pm.