diy solar

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  • Lifetime solar production - feels good man

    We have had our grid-tied 7.5kW array for a little over a year and a half. I looked at the stats randomly this morning and it has recorded 18.8 MWh produced. Granted this was installed by a contractor (I had no desire to be installing 400W panels on my 2 story roof by myself!) So my ROI isn't...
  • Rethinking my battery box

    I have: 32x 230Ah EVE cells. Supposed to be grade A blah blah. Bought from Docan about 2 years ago. Did not get them commissioned yet. 2x JBD BMS with 300A rated contactors (yes, I know, way overkill) 2x 250A class-T fuses 2x DIHOOL 200A MCCBs rated at ICU of 25kA and ICS 20kA 2x shunts with...
  • Chilicon CP-720 grid tie inverters - keeping the power on when the grid goes down

    Hi everyone, I've been lurking for a few weeks trying to read up on stuff. Now I'm looking for some expert advice on what I'm thinking of accomplishing. First off, I'm located in Central Ohio. 11x Chilicon CP-720 microinverters connected to a 8.3kw array on the roof of the house facing...
  • Outback Radian battery input circuit protection

    I was reviewing my (still pending) inverter install to AC couple with my Chilicon microinverters. My planned DC wiring side is below. However, I was looking at the Radian installation manual again to review and saw they want 175A breakers on each battery input. I was putting 250A class-T fuses...
  • 120V Inverter generator, use a 120 -> 240V transformer to the input of inverter?

    Before I got the solar, I got a Champion 3500W continuous/4250W peak inverter generator to run critical stuff in case of an extended power outage. My inverter I have now (Outback Radian) uses 240V split phase input, and has a generator input that can be current limited to the size of the...
  • QUCC or JK BMS

    I'm considering the following setup: 16 EVE230 cells from powerwholesale 8kW Outback Mojave inverter (whenever it becomes available) I was looking at using the JK 200A BMS for the cells, partially because I like the 2A active balancing feature it has compared to JBD. Then I started doing...
  • JBD 7s-20s contactor BMS balance lead wiring question

    I received my JBD 7S-20S 300A contactor BMS yesterday. It has dual 4AWG wires on each connection. I'm only expecting 200A at full load (fused at 250A). I may end up having to replace the black wires off the contactor if it won't reach my bus bar I'm using to join two packs together, or if the...
  • Outback Radian GS8048A in AC coupling mode - max GDI question

    I have 7.92 kW (by label) of grid tie using Chilicon microinverters. I'm in the process of adding AC coupled battery backup for a few reasons (want backup in case of grid failure from a storm, or grid instability due to geopolitical stupidity, or whatever). The upcoming Outback Mojave looked...
  • 16S bank layout and bus bar sizing questions

    I have 32 cells I'm putting into 16s packs, each with its own BMS. My setup is going to be stationary, although if I need to move things around I want it "relatively" easy to move (not that 160 pound battery bank is ever going to be "easy"). 1) Layout. Having 16 cells in a row would be more...
  • Just for my own edumacation... swollen SLAs

    I have an old APC Smart UPS Sua1000NET that runs my modem, router box, NAS, etc. Every few years I have to replace the pair of SLA batteries in it as they get weak (they sit charged 99.9% of the time, rarely does the thing cycle). Recently it started to complain again that the batteries were...
  • Quick assessment of my AC coupled storage

    This is my current setup. Note that nothing is to scale (wire length etc, just a connection diagram). This is what I'm intending to do with the upcoming Outback Mojave inverter to manage the storage/changeover and allow my GTI setup to continue functioning in the event of grid failure: The...
  • Just how terrible is a brass bus bar

    I know copper is much better. I made a mistake. I bought a bus bar set to connect two battery packs to my inverter, I thought someone here had bought this one before and said it worked well, but maybe they bought one that looked like it but this was the cheap brass knockoff. Anyhow, I bought it...
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