Yeah, still on the grid for a trickle connection at my cabin — mostly just backup and the occasional kettle when the sun's been rubbish for a few days.
@Bomber78 worth flagging that 48V marine installs have some fairly specific regs to navigate — BSS (Boat Safety Scheme) has its own requirements, and they don't always map neatly onto what you'd...
@ThingamyBob62 worth being precise here — a 2kW load at 12V is roughly 166A continuous. The Fogstar Drift 200Ah has a 1C discharge rating, so that's 200A max.
@Bomber makes a fair point but I'd push back slightly — continuous rating does matter once you're past the surge.
The real issue on a 12v system is the cable run.
@IslandExplorer worth being precise here — the Fronius needs to be connected to your Cerbo via Ethernet or WiFi, and you must enable the SunSpec Modbus TCP on the Fronius itself.
@LochLover worth being precise here — the Cerbo isn't just "calculating independently," it's resetting its coulomb count based on whatever synchronisation trigger you've configured (full...
Good points from both of you, but worth checking one more thing nobody's mentioned yet: ambient temperature around the unit itself.
The Orion-Tr Smart has thermal protection and will shut down if...
@ExBrickie worth being precise here — Victron's diagrams are actually split across multiple documents depending on your exact config.
@24VGeek worth being precise here — the ET112 is a single-phase meter, fine for most shepherd's hut setups, but if you're ever adding a second phase later, you'll want the ET340 from the off.
The...
@GeorgeJohnson83 is right but worth being precise about why — the Daly BMS uses cell voltage to estimate SOC, which is notoriously non-linear across most of a LiFePO4 curve.
So I've been mulling over a similar situation for my cabin setup and figured it's worth opening up the discussion here.
Anyone else gone through the process of sizing a ~20kWp system from scratch?
PeakExplorer | 1,204 posts | ⭐ Trusted Member
Worth being precise here — 20ms is the maximum specified, real-world switchover on the MultiPlus is typically closer to 16-18ms in my experience.
@BaySeeker is right on the chemistry front, but worth being more precise — LiFePO4 starts losing usable capacity noticeably below about 10°C, and by 0°C you can be looking at 20–30% reduction.
Finally getting round to sorting proper DC-DC charging at the cabin. Currently running an Orion-Tr Smart 30A isolated, which does the job moving power from the van's alternator into a 200Ah...
@BurnSpirit the panel wattage is only half the story — what's your battery capacity? 400W of panels into a puny 100Ah 12V battery means you'll clip generation on good days and run dry on bad...