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It was hot against the battery bank (DC side connected / caps fully charged) when that chart was generated

@ksmithaz1 - CV board breaker is always 'ON' (connected) and CV is always connected on the DC side to the pack (this one is a 30kWh pack; 6x100aH) so the CV caps always stay charged/ready. The AC side of the CV is switched with a 2 pole contactor. The power (current x voltage) through that AC...

There's been a bit of discussion about the chargeverter current ramp rate being too fast, so I wanted to post my experience with my gen 1 CV (yellow enclosure), purchased circa Mar 2024 from Signature Solar. I believe this was the very last of the gen 1 CVs. X-axis gridlines are in 15s...

Resurrecting this thread but I was always under the impression that a MOV (https://www.midnitesolar.com/pages/spd/index.php) was used for lightning strikes A lightning strike will cause a very high voltage spike, but not a high current spike - as such, a traditional fuse wouldn't protect against...

Bit of a thread resurrection here, but EG4 Lifepower4 manual states 0.1V max difference between units prior to connecting in parallel ☝️

EZPZ question - I'm looking at expanding my GW5kES setup to _two_ AIOs in parallel. Unit #1 (primary): Tied to array1 Tied to battery bank1 Primary single phase AC output to load panel1. (On at all times.) Unit #2 (secondary): Tied to array2 Tied to battery bank1 Secondary (dynamic...

Thanks Tim - did you get a chance to measure your switching times and voltages with an oscilloscope while you had it running?

Hey @timselectric - great thread, thanks for posting and knowledge sharing. (y) I bench tested this with a 5000ES-US unit from SS and found an unfortunate shortcoming, at least with my implementation which seems pretty much identical to yours. If you're using a NC AT relay and going from...

Just wanted to say to be careful with this; two midpoint transformers wired in parallel may be in a permanent state of trying to balance each other due to manufacturing variances between the two (even in identical models), causing high neutral currents (in theory). Preferred solution here is a...

@B-Mod - some previous work has been done on this, see post #207 - tl;dr is that nobody (currently - no pun intended) knows, it was tested up to 95C/200F and did not trip. Most thermistors of similar spec seem to be about 150C/300F, so the best guess at time of writing is that it's about that...

@MrM1 - Myself and a few other folks from this thread are working on a similar solution. I'm in the process of a major code refactor of design #216 here which is being built to accommodate multiple inverters, and could technically run multiple transformers as well (has capability for neutral...

Thanks @Cornwallav8r - I'd encourage you to go through the use cases hit on in the pages of this post - I'd suspect you'd arrive at a similar design. There are a lot of details, and there's a reason for every component in the design. To give examples: The neutrals between the autotransformer...

Thanks @craigcabrey - can you help me understand the conductor current path to clear a N/G fault within the 120v panel of #234?

Very cool @MadCow thanks for the link. Looking at the wiring schematic on the inside of the enclosure door on one of their pictures, it doesn't seem like that device has any significant differences over the SolarEdge transformer. It doesn't appear to have any neutral safety disconnect logic, and...

Okay I overhauled the wiring schematic a bit. In retrospect, I am not confident that designs #133 and #159 would clear ground faults while in on-grid mode. This should resolve that issue, as well as incorporate additional functionalty. Changelog: Adds temp monitoring to AT Through K-type...