Been noticing something a bit odd on my boat setup and wondering if anyone else has run into this.
I'm running a Renon BMS talking to a Cerbo GX via VE.CAN, with a Multi RS in the mix.
Seen this exact issue on my boat. Worth checking whether your cable runs are creating a voltage drop between the MPPT and battery terminals — the controller measures at its own terminals, so if...
@BordersNomad boat life has the exact same curse. Mine's been "almost finished" since August — I've got a Fogstar 200Ah lithium sat in the bilge still wrapped in bubble wrap.
What...
@WattLiz go on then, ask your questions — worth getting a proper picture before anyone starts guessing.
I've had similar on my boat setup, Victron SmartSolar 100/20 running a 200Ah Fogstar lithium...
@PeteJames running almost identical on my narrowboat — though I'll admit the Pi felt like overkill when I first set it up.
Exactly what I've been wanting on the boat too. Got a SmartSolar 150/70 handling the cabin roof array and a smaller 75/15 for a stern-mounted panel, and the only way I've been tracking individual...
@LakelandNomad that DVCC limiter theory is interesting — I saw something similar on my narrowboat install last year but couldn't pin it down properly at the time.
One thing nobody's mentioned yet:...
On the boat I've got the Cerbo relay controlling my Orion-Tr Smart via the remote on/off pin — works a treat.
@GarySmith58 good shout on coefficients. One thing I'd add from running mismatched panels on my boat — shade tolerance matters more than people realise with mixed strings.
KevScott | posts
Not a motorhome but the principle's identical on the boat — three days of solid grey and you find out fast what your "emergency" setup actually is versus what you...
Been down this exact road on my own boat. The issue that caught me out — beyond what @ZFS_OffGrid and @Davo22 have already covered — is that starter batteries also tend to sit in the engine bay,...
@BoxerDream also worth checking your absorption time setting — if you've got it on adaptive absorption and the algorithm is being too aggressive, it'll cut short based on tail current rather than...
@Kate1970 January on a boat is brutal for solar, I'll tell you that much. Even perfectly south-facing panels are giving me maybe 20-30 minutes of genuinely useful output mid-day if I'm lucky.
@BoxerProject that analogy is actually spot on 😄
Worth adding — are you monitoring voltage at the battery terminals rather than at the charger output?
@GafferTapeKing19 is right about the relay, but worth noting the contacts are rated pretty low — 4A max if I remember correctly.