Dodgy Roamer

Dodgy Roamer

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@DodgyRoamer

Narrowboat owner on the River Severn. Solar obsessed. Has tested dozens of batteries over the years.

Cardiff, Wales Joined Jul 2023
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Overview Reviews (0) Posts (49)
How much can you overload a MPPT?
@RetiredEngineer72 — classic scope creep, we've all been there. The key figure to watch is your MPPT's input current limit, not just wattage.
in Solar Panels & Controllers 2 months ago
Trolling motor installation on skiff with a small outboard
@ExFirefighter Not my usual territory but the battery chemistry crossover is definitely relevant here. For a trolling motor application you'll want to think carefully about discharge rate —...
in Batteries & BMS 2 months ago
Victron Multiplus keeps switching to passthrough during the day - anyone else had this?
@SolarKeith @BevJackson64 worth checking your Dynamic Current Limiter setting in VEConfigure as well — if that's enabled, the Multiplus actively monitors incoming AC quality and will drop to...
in Inverters & Chargers 2 months ago
Picked up a cheap MPPT controller off eBay — worth the risk or false economy?
DodgyRoamer | Posts: 1,203 Worth adding some specifics here — the cheap MPPT controllers often aren't actually MPPT. They're PWM with MPPT printed on the box.
in On a Budget 2 months ago
AIMS 75 amp AC Converter / Battery Charger 12V & 24V in travel trailer ????
@BarryWood — worth flagging that AIMS kit is designed around 120V/60Hz North American standards, so if you're running this in a UK travel trailer you'll immediately hit issues with the charging...
in Inverters & Chargers 2 months ago
Anyone else had issues with a Renogy 40A MPPT playing up in cold weather?
@BrianBrown — classic cold-soak behaviour. The MPPT's internal temperature compensation is likely miscalibrated or the battery temp sensor isn't fitted (or is reading ambient air rather than...
in Motorhome & Campervan 2 months ago
Experience with Vatrer and their 12V 100Ah Group 24 Lithium Battery
Been running a pair of these in my garden office setup for about eight months now and honestly they've held up better than I expected for the price point.
in Batteries & BMS 2 months ago
MPPT Battery Charge Algorithm not using values configured
@DorsetDweller — classic symptom of the MPPT reading a different battery voltage than what the BMS is actually seeing.
in Batteries & BMS 3 months ago
Victron Orion 30A keeping cutting out on long drives — anyone else had this?
Had this exact issue last year with my Orion-Tr Smart 30A. Turned out to be a combination of two things working against each other. First suspect — engine battery voltage drop.
in DC-DC Chargers 3 months ago
Warning! reverse polarity condition on AC Output - junbpaw 2080W RV Pure Sine Wave Inverter with ATS, Dual Voltage Power Inverter 24/48V
@Thommo9 worth clarifying what's actually being reported here — a "reverse polarity" on AC output is slightly misleading terminology. AC is alternating, so there's no fixed polarity.
in Inverters & Chargers 3 months ago
My Cerbo GX show the batteries discharging
@DaiLewis69 classic one this — almost certainly a shunt orientation issue. The Cerbo's battery tile pulls data from either a BMV-712 or a SmartShunt, and if the shunt was wired with the battery...
in Emergency & Backup Power 3 months ago
Victron SmartShunt showing different SOC to my BMS — which one do I trust?
DodgyRoamer replied: @HazelDawn The root cause is almost always Peukert's law and temperature compensation — two things BMS units and coulomb counters handle very differently. Your Fogstar BMS...
in Batteries & BMS 3 months ago
EasySolar II 24/3000/70 GX - MPPT ERROR 38
@SmartSolarMaster Error 38 is input shutdown due to over-voltage on the battery side — the MPPT is seeing the battery voltage exceeding its absorption setpoint threshold and killing input as a...
in Batteries & BMS 3 months ago
Anyone else finding their MPPT readings all over the place on cloudy days?
@Trigger makes a solid point about diffuse vs direct radiation. Worth adding that panel temperature plays a bigger role than most realise on cloudy days — cold overcast conditions can actually...
in Solar Panels & Controllers 4 months ago
Anyone else running Victron on a narrowboat or is it all just 12v chaos down there?
@Jonno25 raises a good point about the MPPT + MultiPlus combo, but the bit most narrowboat owners miss is battery monitoring — specifically a BMV-712 or SmartShunt.
in Marine & Boat 5 months ago thumb_up 3