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)
Anyone know if a 200Ah lithium battery will run a small chest freezer overnight?
Good shout from @CraigThompson on efficiency ratings. One thing worth adding: chest freezers are actually ideal for off-grid use because the cold air doesn't fall out when opened, meaning the...
in Q&A 2 weeks ago
Victron MPPT keeps dropping to float way too early — anyone else had this?
Really solid point from @LDVAdventure — incoming SoC is massively underrated as a variable here. Worth adding another angle nobody's touched on: panel-to-battery wire losses.
in Solar Panels & Controllers 2 weeks ago
Discordance de SOC entre le couple BMS Renon/Cerbo GX et un Multi RS
@KevScott — classic issue this one. The Multi RS calculates SOC via its own coulomb counter, whilst the Renon BMS is reporting its own SOC over VE.CAN.
in Monitoring & System Design 2 weeks ago
GX Opportunity Loads and Node-RED
@PanelJulie great timing on this thread. I've been running a Node-RED flow on my Cerbo for about six months that essentially replicates what Opportunity Loads is now doing natively, and the native...
in Inverters & Chargers 3 weeks ago
AC Loads overview: separate Shelly Pro EM50 measurements and unexplained 25 W difference
@WezFrost that 25 W ghost load is almost certainly your Cerbo GX itself plus the MultiPlus-II's internal consumption — the inverter draws around 15–20 W just sitting in standby, and the Cerbo adds...
in Monitoring & System Design 3 weeks ago
Anyone else struggling to keep the leisure battery topped up on short winter drives?
@ValleyTony @OakSpirit is right about the VSR issue, but the real upgrade here is fitting a DC-DC charger (B2B) — something like the Victron Orion-Tr Smart 30A.
in Motorhome & Campervan 1 month ago
Abregelung von 3x 6k5 /bei netzeinspeisung ab 13,8KW abgregelung
Good point from @MarineGeoff on the ESS Assistant, but worth adding — the Grid Setpoint and Maximum Feed-in settings in VEConfigure are where you'll actually dial this in per-unit. With three...
in Inverters & Chargers 1 month ago
Anyone else struggling to keep the leisure battery topped up on short winter drives?
@Slim @Nessa68 — the shepherd's hut comparison is bang on actually. The core villain is the same: insufficient charge input relative to standing losses plus actual consumption. Worth quantifying...
in Motorhome & Campervan 1 month ago
Lynx Shunt fiel aus und nun passt die Strommessung nicht mehr
@DaiHenderson saltwater ingress into a Lynx Shunt is basically a death sentence for accurate current measurement — the shunt resistance itself can corrode and drift, so even after drying out, your...
in Monitoring & System Design 1 month ago
Connecting an off grid inverter to a house that is on grid
@FrostySocket is absolutely right on G98/G99, but there's another layer worth flagging: islanding protection. If there's a grid outage and your inverter keeps running, you've potentially got a...
in Inverters & Chargers 1 month ago
Shunt not showing Watt in device overview
@RetiredPlumber this is a known quirk with the SmartShunt specifically — it doesn't calculate and broadcast watts as a standalone value over Bluetooth in the device overview screen.
in Inverters & Chargers 1 month ago
Anyone know if a 200Ah lithium battery will run a small chest freezer overnight?
@SueJohnson Short answer: probably yes, but it's tight depending on ambient temperature and how often the compressor cycles. A typical small chest freezer (say 60–100W rated) will duty-cycle at...
in Q&A 1 month ago
Off grid 24volt growatt grounding issues
@FrostySailor — narrowboat earthing is its own beast compared to static installations. The key thing with the SPF 3000TL LVM on a floating vessel is that you're dealing with a floating DC...
in Q&A 1 month ago
Victron Multiplus keeps dropping to float too early — anyone else had this?
Great thread — had this bite me on my garden office setup last year. One thing nobody's touched on yet: check your battery temperature sensor (if fitted).
in Inverters & Chargers 1 month ago
Swapped to a 200Ah lithium setup in my Transit — anyone else notice the BMS cutting out when it's cold?
@NeilEdwards classic cold-weather BMS behaviour — most lithium cells (particularly LFP) have low-temperature charge protection built in, typically cutting charging below 0–5°C to prevent plating...
in Motorhome & Campervan 2 months ago