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  • Freight Forwarding to Hawaii

    I just got a quote for shipping a system similar to what @thetubernoober ordered in this thread: Thread 'Tag along with me on my $30,000 Signature Solar purchase. International Order?'...
  • System Architecture - go big or go...

    I currently have a 7kW microinverter system and want to add battery backup along with 1-2MWh of additional annual energy production and a LFP battery. I live in Hawaii, so shipping things can be a pain. (Batteries in stock on the island are in the $700/kWh range!) I see three viable options...
  • UL1973 300Ah 48V Batteries

    I would love to get four 300Ah 48V Trophy batteries for my new system; stood on end and bolted together with busbars (and a brace to the rack ears) it can sit on a simple shelf below an AIO inverter, have fewer than 6 disconnects, and make for a dead-simple installation. But they aren't...
  • Upstream ATS for Hybrid Inverter?

    I am planning on adding a hybrid inverter to my system and am trying to decide if an automatic transfer switch to bypass the inverter "output" in normal operation is a good idea or not. I have a 200A service and am looking at a 6-8kW inverter with an internal 60A transfer switch. Currently our...
  • Mount options for Silicon coated roof

    Other than a traditional rail system, are there any good mounting systems that work well with a roof that has had a silicon coating applied? Whatever I go with I will likely have the roofing contractor come back and add a layer over any new penetrations. The underlying roof is modified bitumen...
  • Supplement or Retrofit?

    I'm struggling a bit with finalizing my PV layout to add ~4kW to my existing system consisting of (33) 250W LG panels and Enphase M215 microinverters that were installed in 2014. For the purposes of layout I am looking at 455W SolarEver panels, although a few other versions are better with...
  • Fusing - Positive vs 2-pole

    I'm trying to understand why conventional wisdom is to just fuse on the positive for a fairly large (>600Ah) ungrounded 48V battery bank. I get that it is fine to do that on smaller systems (say <100Ah), or if it is negatively grounded, or if you have an insulated busbar and short run to the...
  • "Powerwall" with Enphase M215 - Inverter logic

    I have an existing 33xEnphase M215 system and want to add a LFP battery system. I understand how it would operate in on-grid mode, but am getting confused with off-grid operation of the inverters when the load and PV do not match. I understand that the Enphase inverters have no ramped...
  • Re-thinking Inverter Sizing...

    So I have two years of great metering data that shows me that the right size inverter is a 6.8kW unit with 10-12kW surge capacity, running in parallel to my existing 7kW enphase system. Then the in-laws came during Christmas time... and we managed to have a grid outage at the same time (along...
  • Integrated Microinverter/Battery

    I am wondering if a product exists that integrates a microinverter and battery specifically for a two-panel 800-900W setup. The application I am specifically interested in is lower income housing in the Carribean for something that could tie into the refrigerator outlet for a grid connection...
  • USB-C "Chargeverter"

    In light of @Battery Bob's thread, https://diysolarforum.com/threads/creating-an-easy-to-use-battery-and-inverter-sizing-calculator.71247/#post-905111 I am wondering if there are any good (commodity) solutions for combining 1-2 LFP cells (say 200-300Ah total) and some power electronics to give...
  • Expanding 48V LFP Bank later

    Is there a practical approach to expanding a 48V server rack battery in the future? It's looking like I will need to phase my battery bank over the course of 12-18 months (first purchase to second purchase). The original batteries could have up to 200 cycles (equivalent) by the time the new...
  • IP-65 / Salt Spray Hybrid Inverter

    Are there any IP-65 inverters out there that can handle salt spray in a 2-3kW range? The location it would go is very close to pounding surf and thick layers of salt quickly accumulate on everything. It would be coupled to (4) 400W half-cell panels and a 5kWh weatherproof battery to support a...
  • Re-torquing AC Connections

    I have an enphase system - 7kW AC on a 40A breaker. The breaker has tripped offline twice now and one phase of the breaker is ~38C and the other closer to 30C. Generally I would assume the wire needs to be re-torqued, but that kind of brings me to a philisophical issue: A microinverter system...
  • Single 400W Panel + 5kWh battery

    I have about 20W of load that I want to support from a DC:DC converter tied to a 5kWh/48V battery and charge with a single 400W panel installed on the roof of the house. Struggling to figure out what to do for a charge controller and RSD; I know it would be easier at 12V, maybe with 200W...
  • LFP "UPS" and Load Shifting

    My house has ~7kWh/day of IT loads, most of it centralized in a single cabinet and more that could be placed in it. Is there any product out there that can act as a true UPS and also a load-shifting device to push grid consumption to PV hours? I picture it charging ~4 hours per day, operating...
  • UL-Listed 3kW hybrid (off-grid) inverters?

    My plans are again gone awry due to the lack of a UL or NRTL listing for 3kW off-grid hybrid inverters. I had been planning on an EG4-3000, but it is only CE-labeled and not 3rd party tested. I am getting tired of my analysis-paralysis and would really like to get my supplemental system up and...
  • Thermal Camera, Micro-ohmmeter, or Both?

    Planning out my 40kWh battery system, and wondering if I should expect to just commission with a thermal camera, or if micro-ohmmeter testing of the connections is warranted. For that matter, would you megger test the insulation for 48V battery cables? I am planning on purchasing pre-made...
  • Enphase (M215) Longevity?

    My Enphase system was installed in 2014, and consists of (33) M215 microinverters. I've had a total of 5 failures in the last three years, waiting on the latest two replacements now. The rest are original install units. I am in a coastal region, so there is plenty of corrosion potential. I...
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