Most reacted threads

  • MIDI-based alternative to MRBF or ANL with higher AIC

    Just sharing this fuse option for those with smaller systems considering MRBF or ANL: Littelfuse MIDI High Performance 70V (Available at waytekwire, mouser, digikey and other places for about $4). It has 2,500 AIC @ 70V (Spec sheet doesn't list lower voltages, but if it functions like all the...
  • New LF105 cells seem to have a sudden drop in capacity, bad cells? Something else?

    First off, I'm off grid, so I don't have the ability to easily charge batteries besides through solar and doing a full discharge is risky because it leaves me without power if I get the weather predictions wrong. I bought 8 LF105s from ezealco (here), hooked them up to a JK BMS, set...
  • Any tear downs or experience with RoyPow 24v 80ah metal case?

    I'm looking at this battery by RoyPow: https://www.18650batterystore.com/products/roypow-24v-80ah-lithium-battery-s2480-a-heated-ip67 https://www.amazon.com/Lithium-Rechargeable-Scrubber-Trolling-Electric/dp/B09SYZCYDS Strangely full of higher end features for the price (and priced much lower...
  • LVD/BMS redundancy and apparent contradictions

    I'm a bit confused why there's a universal recommendation for an LVD in a LFP bank with a BMS. The only argument I hear repeated over and over is in the form of a truism: "your BMS *should* be the last resort for protection." But, what exactly is the technical reason for this? As far as I can...
  • Any reason why MRBF seems to be recommended over ANL so often around here?

    A bit confused. I keep reading a generality that MRBF fuses have higher current interrupting capacity than ANL (usually from posts asking about class T alternatives), but I keep finding the opposite in spec sheets. Apples to apples: BlueSea MRBF 5000A @ 32V vs BlueSea ANL 6000A @ 32V. Spec...
  • Fusing Panels

    I'm going to be wiring some new Hyundai 305W panels (9.86 Isc) in 2S2P. I believe the fusing/wire is rated by Imax which is calculated by Isc * 1.56, so that's 15.3 per series string/panel. These appear to have 12AWG. The spec sheet says maximum reverse current 20A. Since two strings...
  • Battery SG tests show ~60% SOC, but Voltage drops to 6v under load.

    I'm in the process of ordering a replacement LFP battery, but am still trying understand what is on with my FLA bank (4x 6v GC-2 215ah) which I've had for about 6 years. While I've always had voltage drop issues on my battery bank (for about the past year it has often been dropping to by 1V or...
  • 2S 12V batteries, initial balancing off grid with mppt or by putting in parallel?

    I'm redesigning my system and switching to LFP. I need a 24V 50ah or possibly 100ah (depending on price-value ratio). It seems that the market provides better prices and better features on average if I do 2x12Vs than if I try to get a single 24V. Plus, I'd have a bit of resilience in the event...
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