Recent Posts

Thank you for invitation. Registration is done.



Note: This message sent by the system behalf of olvi.

This member is invited by me. Registration isn't completed yet.


Note: This message sent by the system behalf of Sideshow Bob.

[Country]

Country

Romania

Note

Hello everyone, I've been working in the fields of hardware and software development for several years, with hands-on experience in circuit design, embedded systems, firmware development, and various testing methodologies. I’d like to offer my support and share my knowledge with members of this forum. If anyone needs help with troubleshooting, code review, hardware design advice, or test strategies, feel free to reach out. Looking forward to collaborating and contributing to the community!

You can also install a buck converter at the array's output and hook the inverter's PV input cables to the output of the buck converter. That will probably require a PV output voltage monitoring system and a bypass.

Just for some closure on this fault. Once we fully re-calibrated the meter this error was eliminated. So someone maybe made a cal entry error at some time.

[Country]

Country	korea
Site	.
Note	Student. Exchange a lot of information.

A comprehensive article series on subjective topic

https://www.electronicdesign.com/technologies/power/article/55286293/texas-instruments-power-electronics-evolve-for-the-era-of-high-voltage-dc-hvdc-distribution?o_eid=5207B4070834D1J&oly_enc_id=5207B4070834D1J&rdx.ident[pull]=omeda|5207B4070834D1J&utm_campaign=CPS250423223&utm_medium=email&utm_source=ED+Power+%26+Analog


https://www.electronicdesign.com/12345/whitepaper/21233720/electronic-design-factor-pfc-into-your-power-supply-design?o_eid=5207B4070834D1J&oly_enc_id=5207B4070834D1J&rdx.ident[pull]=omeda|5207B4070834D1J&utm_campaign=CPS250423223&utm_medium=email&utm_source=ED+Power+%26+Analog

https://www.electronicdesign.com/technologies/power/whitepaper/21162012/electronic-design-how-to-improve-llc-converter-power-density?o_eid=5207B4070834D1J&oly_enc_id=5207B4070834D1J&rdx.ident[pull]=omeda|5207B4070834D1J&utm_campaign=CPS250423223&utm_medium=email&utm_source=ED+Power+%26+Analog

https://www.electronicdesign.com/technologies/power/whitepaper/21183762/texas-instruments-understanding-common-isolated-power-ics-for-digital-isolation-systems?o_eid=5207B4070834D1J&oly_enc_id=5207B4070834D1J&rdx.ident[pull]=omeda|5207B4070834D1J&utm_campaign=CPS250423223&utm_medium=email&utm_source=ED+Power+%26+Analog

https://www.electronicdesign.com/technologies/power/article/55241448/electronic-design-overcoming-the-ai-power-crunch-requires-more-robust-isolation?o_eid=5207B4070834D1J&oly_enc_id=5207B4070834D1J&rdx.ident[pull]=omeda|5207B4070834D1J&utm_campaign=CPS250423223&utm_medium=email&utm_source=ED+Power+%26+Analog


sadman

I still haven't decided what to do, but found this 1000VDC variable power supply on ebay for $50:

https://www.ebay.com/itm/334503593016

The specs say it can put out 1000V @ 0.4A which should be adequate for testing this. 

https://assets.ctfassets.net/ntf98c1thwoe/1AojVLJke9WasHhTvkaMS2/184f9df025c552959ed4360400e8e0be/labconcopowersuppliesmanual1992-2007.pdf

Thank you for invitation. Registration is done.



Note: This message sent by the system behalf of muhammadali.

I more or less understood something like that...
you must match the array and the possibilities of the inverter before digging and installing...
the easy move would be to change the inverter now to match the array then.
I don't know if your zener mods will work or not, but it's worth a try.

When I started the ground mount solar array in 2008, I did plan ahead to some degree, but did not imagine I would purchase equipment in 2025 that can only withstand 550V maximum open circuit voltage instead of the more typical 600V or 750V of the SMA TL series grid tie inverters I installed.  I had forgotten the details of my wiring and thought the wiring to the array was direct burial UF cable, but it turned out that I used 3/4" liquidtight metallic flexconduit.  Oddly, the wire in the conduit is only 14 gauge.  Presumably, that is what I had on hand or was available at a good price at the time, but I found 3 unused wires in the conduit so could split the array without pulling additional wiring. 

I got a Bluetti EP900 on/off grid battery system with 2 mppt solar inputs that are limited to 550V.  Since I only got the EP900 a couple weeks ago, I'm just setting it up now.  I'm planning to stay with the old SMA TL grid tie inverters when utility power is available, but want to configure the system so that I can easily switch the solar array to feed the EP900 during extended power failure. 

I suggested the zener voltage limiters to a friend many years ago who used it in his small hydropower system and that has worked well for nearly 25 years.  I haven't used them myself though.  After finding that I did run conduit and have  spare wires in the conduit, I may just split the array into 2.  Combining the 2 with diodes probably won't be the most efficient, but may suffice since it would be used in that configuration except during extended power failure which is not a frequent event.