Recent content by Johan

Also you can check out this: https://diysolarforum.com/resources/youlovesolar-wire-size-calculator-highly-customizable.387/

Update: Only done a couple dozen cycles so far. Always kept SoC between 50% and 90% SoC while stored in climate-controled space. I still have the version with the 1st gen (?) BMS. Result: Extremely out of balance, only 3.6 out of 5.1 kWh available. 🤨 Replaced with JK BMS 200A 2A active...

Per request of @Pi Curio, 10 Heschen fuses (sourced on Amazon; HSPV-30; 32A; 1000VDC; I1 = 33kA) were blown while mounted in their DIN-rail fuse holders (sourced on Amazon) in the vertical position. These fuses are filled with sand, similar to Class T fuses. The resulting current versus time...

Today two more 22 AWG copper fuse wires were blown, similar to the previous black curve. The 22AWG copper wire fusing current is approx 41Adc (Preece), so this is a relatively small fuse having a clearing (blowing) time that is at the lower end of what I expect to be used in practise. Goal...

Thanks everybody a lot for the input. Feature requests so far: Create current versus time plot, e.g. using an oscilloscope / clamp meter with inrush (the latter has too low max current). Test more fuse types: Class T (example); bs88; NH; 300A MEGA; CNL; South Bend. Test breakers - cheap amazon...

Another data point: I just dead-shorted a 150A MRBF fuse using 330Ah 48V LFP and 4/0AWG cable. Results are here.

Another data point: I just dead-shorted a 150A MRBF fuse using 330Ah 48V LFP and 4/0AWG cable. Results are here.

Another data point: I just dead-shorted a 150A MRBF fuse using 330Ah 48V LFP and 4/0AWG cable. Results are here.

Introduction Marine Rated Battery Fuses (MRBFs) are sometimes used to replace Class T fuses due to supply chain issues, ease of installation, space constraints, and cost. However, the breaking capacity of MRBF fuses is significanly lower than that of Class T fuses as shown in Figure 1. Figure...

Added NEC 250-500 kcmil wires Added Aluminum material Added periods to version numbering

Problem It's very annoying when yet another expensive and hard to source class T fuse blows. So how can we visualize why they blow? The graph below may explain why Class T fuses blow due to the inrush current from a (for example) LFP battery to an inverter. It may also explain why taking a fuse...

Improved comments for when running multiple wires in parallel Readability improvements "under the hood"

Improved UI Added feature to run multiple wires in parallel

Made conductor resistivity dependent on the wire insulation temperature rating.

Resistivity increases with temperature. The used conductor resistivity was optimistically low (corresponding to 20degC). To be more conservative, the resistivity is now chosen higher, corresponding to 75degC, roughly conform NEC chapter 9, tables 8 and 9. So for a given max allowable voltage...