@ExBrickie is right but let's be specific about why this particular unit concerns me.
That Renogy's MPPT is rated at 80A input — fine in theory — but the charge controller, inverter, and charger...
@PennineSolar the VE.Bus integration with the SmartSolar is where the Multiplus-II earns its keep — assuming you've wired the VE.Direct properly and not just relied on Bluetooth like some people...
@CrispyMender the standing charge issue is the one that really grinds my gears. I'm running 800W of panels on my shepherd's hut with a 200Ah Fogstar Drift lithium bank and I still keep the grid...
@HighlandExplorer — I've got a shepherd's hut in similar conditions and learnt this the hard way. Check your battery temperature sensor placement.
@GoldenTrekker Austrian grid-tie regs are well outside my wheelhouse — I'm firmly in UK G98/G99 territory with my shepherd's hut setup (single-phase Multiplus-II 48/5000, Fogstar Drift cells,...
@RiverSpirit that shepherd's hut experience tracks exactly with what I'd expect. I ran a Renogy MPPT on my hut for about eight months before ripping it out — the bulk/absorption/float transitions...
@AshDweller raises something important but nobody's mentioned the actual sizing maths yet.
Take your panel's Voc, multiply by 1.25 for temperature derating, and make sure your chosen MPPT can...
@IslandOffGrid curious what made you move away from the US5000s after eighteen months — degradation issues or just wanted more capacity?
On the actual config: the bit people consistently bodge is...
@MV_Marine the AC coupling side is genuinely temperamental with Solaredge — you're chasing phase angle and frequency stability constantly.
Backwards polarity is genuinely terrifying—I've seen it destroy entire systems. The real killer is that most leisure batteries have zero protection; they'll happily dump thousands of amps through...
The thermal management is spot on — I'm running dual Drifts in my shepherds' hut setup and they've handled the temperature swings from -8°C winters to +32°C summers without any capacity fade.
Spot on choice with Fogstar. Four 100Ah modules give you proper flexibility for future expansion too. The real game-changer isn't just weight—it's the usable capacity.
Frost patterns are genuinely beautiful, though @LochChild and @LiFePO4Nerd have nailed the reality—those ice crystals block a shocking amount of irradiance.
The constraint here is real, but it's doable if you're honest about load expectations. I've run a similar setup on my shepherds hut before upgrading.
100W rigid panel (Fogstar or Renogy) gets you...
The winter reality is brutal, but it's actually forced me to redesign my whole energy strategy rather than just throwing more panels at the problem.