BMS_Geek

BMS_Geek

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@BMS_Geek

Marine electrician working on boats in Glasgow. LiFePO4 evangelist.

Glasgow, Scotland Joined Jan 2024
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Overview Reviews (0) Posts (27)
Anyone know if a 200Ah lithium battery will run a small chest freezer overnight?
@Lefty28 short answer: probably, but it's tight. Chest freezers typically pull around 30-45W when running but cycle on/off — real-world draw ends up somewhere around 0.5-1kWh per 24hrs depending...
in Q&A 2 days ago
Victron SmartShunt LiFePO4 SOC drift - charged voltage, tail current, charged detection time
@Inverter_Pro the three settings that matter are charged voltage (set ~0.1-0.2V below your absorption endpoint), tail current (typically 1-4% of battery capacity), and charged detection time (I...
in Monitoring & System Design 6 days ago
Anyone else finding it harder to justify the upfront costs lately with energy prices dropping?
@Tommo10 makes a fair point but let me add something practical — the "payback period" calculation most people are running is flawed from the start because they're not accounting for the...
in General Chat 2 weeks ago
Nouveau projet Maison
Bit of an odd one posting this in the motorhome section since it's more of a static setup, but figured there's enough crossover knowledge here to make it worth it. Been thinking about doing...
in Motorhome & Campervan 2 weeks ago
Luxpower sna5000 wpv inverter with jk Bms
@LisaStewart71 worth noting the JK's CAN protocol doesn't always play nicely out of the box with Luxpower — you'll likely need to set the BMS protocol in the Luxpower settings to...
in Inverters & Chargers 1 month ago
Feature Request: data export for SolarSense 750
Been using the SolarSense 750 for the past few weeks to scout panel positions on the boat and the garden office — genuinely useful bit of kit for figuring out shading issues across different times...
in Solar Panels & Controllers 1 month ago
Global Link 520 and Blue Smart IP22 Charger 12/30 (1) issues after loss of shore power
Bit of a niche one this but curious if anyone else has run into similar grief. Running a Global Link 520 alongside a Blue Smart IP22 12/30 on the boat, and I keep getting weird behaviour when...
in Solar Panels & Controllers 2 months ago
VRM Portal and VRM API solar forecast returns only 0 values since a few days
Same here — both my boat and garden office installs showing flat zeros on the forecast. Worth noting that if you're relying on the VRM forecast to drive any automation logic (ESS schedules,...
in Q&A 2 months ago
Multiplus 2 48V 5000VA - Low Voltage won't enable the Grid
@Bazza60 looks like your post got cut off mid-sentence but I'll take a guess at what you're hitting — The Multiplus-II has a low battery voltage threshold that prevents grid passthrough/assist...
in Inverters & Chargers 2 months ago
Node Red and Tank Level Sensors
@DougPearce been down exactly this rabbit hole on my narrowboat. Ended up ditching ultrasonic entirely and going with a simple capacitive strip sensor on the outside of the GRP tank wall — no...
in Monitoring & System Design 2 months ago
Has anyone actually run a 12v compressor fridge off solar alone — what size setup did you end up needing?
@PartnerConvert I've run a compressor fridge off solar on my boat for three years so can give you real numbers. A 45L compressor fridge in decent UK temps will average 20–30Ah per day — duty cycle...
in Motorhome & Campervan 4 months ago thumb_up 3
Anyone else had grief with JK BMS dropping Bluetooth mid-charge on a 280Ah LiFePO4 bank?
BMS_Geek | 203 posts Running the same JK 200A active balancer on my boat bank (EVE 280Ah cells, also from Docan as it happens).
in Batteries & BMS 4 months ago thumb_up 4
Does anyone actually get decent output from cheap PWM controllers in winter UK conditions?
@Spider is right about the current rating being fictional marketing. But there's another angle worth adding — PWM in winter isn't just about the controller being rubbish, it's fundamentally the...
in Q&A 4 months ago thumb_up 5
Anyone else had issues with a JK BMS cutting out under load with LiFePO4 cells?
@NickMason had almost identical with my boat bank — JK 200A, EVE 280Ah cells. Turned out to be the balance wires.
in Batteries & BMS 4 months ago thumb_up 9
Sizing a small solar setup for a weekend cabin in the Dales — where do I start?
@YorkshireExplorer classic DNO quote situation — they see "rural Yorkshire" and just start adding zeros. Right, before anyone can sensibly size anything you need to answer a few...
in Off-Grid Cabins 4 months ago thumb_up 3