Recent content by cinergi

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    Cinergi's 28 kWh / 4 kW Solar / 10 kW inverter RV build

    Yes I have to bond NG but it works perfectly with that. When I was in the Badlands with 100+ temps I needed it a lot, actually. I produced 20-23 kWh per day but I needed like 40. I also am having a problem here in AZ but I'm getting a lot of shading so I'm only able to produce 8 kWh per day...
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    My Push Button Pre-Charger Install for the SW 4024 Inverter

    I did, but I'm not sure I got the calculations right because it didn't help. After the other issues, I gave up on that exercise. I didn't do any calculations. I have 2 5kVA inverters plus two SCCs and the DC-DC (all 5 devices have precharge situation) so it's a LOT of capacitance. I started...
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    My Push Button Pre-Charger Install for the SW 4024 Inverter

    I've got other videos on that channel plus my build thread where I go into the nuts and bolts but the summary is that I went with Orion for BMS and a Midnite 250 amp DC breaker. I manually precharge for now but Orion has a precharge feature coming in the next few months ...
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    Cinergi's 28 kWh / 4 kW Solar / 10 kW inverter RV build

    I tried flexible and had performance problems so I went back to rigid. Might be fine for most but it wasn't for me. Also, I'm not gonna have the u-shaped issue or anything similar - my pack is in a compression frame. Nor will I have over-SoC. I have two protection mechanisms to prevent that...
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    Cinergi's 28 kWh / 4 kW Solar / 10 kW inverter RV build

    My cells aren't anywhere near 90 degrees Celsius. And vice-versa. But the overwhelming evidence shows that there are no problems - arguably millions of batteries with solid bus bars with no reported problems as a result of solid bus bars. In an environment such as an EV, I agree that...
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    Cinergi's 28 kWh / 4 kW Solar / 10 kW inverter RV build

    Yeah I'm thinking of all the drop-in replacements we've seen teardowns of. Zero compression and solid busbars. And these get placed in mobile environments. The example being displayed (not by you) is something designed for an EV. Yes, flexible bus bars in that case due to the nature of its...
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    Cinergi's 28 kWh / 4 kW Solar / 10 kW inverter RV build

    I tested 0% SoC to 100% SoC - worst case scenario. Expansion is based on SoC, not temperature. I had poor performance with wires. The gory history is in this thread. I didn't try flexible - too expensive with 32 cells that's capable of 200 amps. Except that I measured and we've seen no...
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    Cinergi's 28 kWh / 4 kW Solar / 10 kW inverter RV build

    I measured the expansion between terminals (earlier in my thread) while in the compression fitting using flexible cables ... and I observed *fractions* of a mm of movement (like, 0.1 to 0.5mm max) Nothing to be concerned about IMO.
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    New Victron Multiplus-II 12/3000/120-50 designed specifically for RVs with 30A/50A input flexibility available MARCH 2021

    Yeah - I have a unicorn RV ... 240V needed for mini-split and it was a custom-build RV so the roof was clear and it was easy to get 10 335 watt panels up there. My system is relatively inefficient (dual 5k inverters idle power is a lot, for one) and combined with some shading I get here in AZ...
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    EVE-280 cells should these be clamped tight or spaced for expansion?

    From what I remember reading, this is correct.
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    EVE-280 cells should these be clamped tight or spaced for expansion?

    Thanks! I moved to bus bars due to relatively high resistance (I believe skin effect caused by the AC waveform induced on the battery pack by the inverters) which was confusing the BMS due to wild voltage fluctuations at the per-cell level. Indeed I was also concerned about the rotational...
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    EVE-280 cells should these be clamped tight or spaced for expansion?

    (that's my build). My personal experience is that the space between terminals moves very little compared to the middle or bottom of the cell. After experimenting with flexible "bus bars" (wires) and measuring the changes in distance, the movement was so small that I decided to stick with rigid...
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    EVE-280 cells should these be clamped tight or spaced for expansion?

    Yes almost 100% at 100% SoC gets me the PSI specs I was looking for. They're long springs so even the 16*0.5mm of movement that could occur still gives me great compression at 0% SoC
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    EVE-280 cells should these be clamped tight or spaced for expansion?

    Mine is two compression structures of 16 cells each. Just have to account for X cells times 0.5mm of variance when sizing your spring. https://diysolarforum.com/threads/cinergis-28-kwh-4-kw-solar-10-kw-inverter-rv-build.13786/page-24#post-234763
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    Our NEW GO-TO LiFePO4 vendor...09.20.21

    It's probably buried in the middle of my build thread somewhere. But charging (even .1C) above 80% SoC prematurely triggered the events. I wasn't sure what it was until I switched one of the connections to a bus bar instead of a cable and I couldn't believe my eyes.
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