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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...

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?'...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...