diy solar

diy solar

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  • Post in thread: Iowa wants you to pay utilities even if you are totally off-grid and don't use grid power.

    If you have solar and are grid tied (essentially using the grid as your battery) then you should pay the fees, after all you're using the infrastructure. If you're off the grid and store your own power, then no, you shouldn't have to pay fees for infrastructure you don't use. There, was that...
  • Post in thread: Developing Software

    I built a dashboard and control panel for my system using Node-Red, InfluxDB and Grafana. it all runs on a RPi
  • Post in thread: Iowa wants you to pay utilities even if you are totally off-grid and don't use grid power.

    That's what happens when "Corporations are people" they buy politicians to create legislation to line their pockets.
  • Post in thread: Iowa wants you to pay utilities even if you are totally off-grid and don't use grid power.

    Agreed, We actually lower their bottom line by producing power for them. The problem is their investment on large power plants is already made and now they don't get the revenue they used to get off our monthly bill so they're trying to get money a different way. It should at least be equal...
  • Post in thread: Using an EV Car as your Emergency Backup Battery

    The whole concept is called vehicle to grid (V2G) but I haven't really seen anyone implement it yet. I know Elon Musk was asked about V2G in an investor meeting and he said probably not since the batteries aren't designed for that many cycles. Someone also mentioned that people with unlimited...
  • Post in thread: DIY Solar monitoring.

    Take a look at the Node-Red dashboard pallet, you can feed it your data directly and even make functional controls from it. Here's mine Of course if you want more than a day or two of data to review I'd suggest influx DB and Grafana Here's my Grafana historical graphs fed off influx DB
  • Post in thread: Tesla batteries

    Here's the build for my system where I used a whole battery pack. https://secondlifestorage.com/showthread.php?tid=7743
  • Post in thread: Connecting romex with my solar

    The main question here is. Does that inverter bond neutral to ground? Some inverters do this in order to get around the issue of a floating earth connection which would cause some appliances from working. In the US at the main panel your neutral bonds to your earth. If a fault were to occur...
  • Post in thread: Has anyone designed and built an actual code compliant Powerwall system?

    That's my system. it's a build thread so that's why it is chronological. What do you want to know?
  • Post in thread: Emergency AC Coupling a grid tie system?

    Do you have the mate3 controller? I belive you can program one of the relays to be turned off while gen power is enabled. To said relay connect the coil of a large contactor, use the contactor to break the output line of your GT connection to your panel. This will prevent your GT system from...
  • Post in thread: DIY PowerWall

    Umm.. Did you not loot at the datasheet? There's 3 models, the highest is 6kW. For DIY batteries you'll need a BMS with CAN output which is how the inverter gets stats on the battery. Both SimpBMS and EVTV Controller have support for CAN, or you can write your own if you use TomDebree or...
  • Post in thread: DIY PowerWall

    SMA has an inverter capable of using the whole pack without rewiring it. DC voltage range/ DC rated voltage 100 V - 550 V / 360 V https://files.sma.de/dl/30859/SBSXX-US-DS-en-20.pdf
  • Post in thread: Backfeeding the grid

    Yea... that's not how meters work. The meter doesn't "record in reverse" when the voltage rises above the grid supply voltage. You're charged for the kW which is the voltage*amps used. Voltage is just the speed, amps is the volume. I think you're getting hung up on the fact that AC alternates...
  • Post in thread: How to charge battery bank with gas generators but no inverter/charger

    You have 2 options. Do as @Jim Burrow said and connect a battery charger to your gen and use that to charge the batteries, this however is inefficient and you're going from DC -> AC -> DC and there's losses every time you switch over. What you really need is a DC generator, alternator or turbine...
  • Post in thread: An Enphase Ensemble Installation

    https://www.dropbox.com/s/xc40op8eqfrykaa/AndroidXam.AndroidXam.Signed2019.apk?dl=0 Install that APK in an android device, type in the serial for your Envoy and it'll give you the password for it.
  • Post in thread: Adding remote on/off to inverter - Help

    DO NOT DO THAT. I recognize that remote, it's made by Sigineer, they're the OEM and everyone else just rebrands their stuff. The sigineer manual for that remote has warnings not to cut it while plugged in because it carries 12v and it'll damage the inverter. Point is Ethernet is not 12v and...
  • Post in thread: Which Tesla Model S batteries have the plug to hook up a balance cable?

    That video is useless, He's just talking about wheels and TOU. OP here's what you're looking for: https://zero-ev.co.uk/product/tesla-model-s-x-battery-module-replacement-bms-board-v1/ it replaces the OEM Tesla BMS board with one where you can plug in a standard cell checker/balancer. As a...
  • Post in thread: Which Tesla Model S batteries have the plug to hook up a balance cable?

    And at the rate that Jack talks, and talks, and talks it'll take him a year to get the necessary info. Not to mention that OP asked about the plugs on the modules so he could hook up a BMS to it. Most of jacks videos are about using his own controller and the OEM boards not using a third party...
  • Post in thread: off grid tesla car

    What you're looking to do won't work for a couple reasons. The battery pack has 2 contactors built into it, meaning that unless the car sends a CAN message to the battery module the contactors won't close and you won't have any HV power on the cars wiring. You could root the MCU and send your...
  • Post in thread: tesla salvage car

    So far it's worked out great. We had a power outage last week and I only found out about it because we're posting about it on next door. It happened overnight we didn't even wake up for it. Here's my build if you want to look through it. https://secondlifestorage.com/showthread.php?tid=7743
  • Post in thread: 10kWh portable Tesla generator

    That's quite a bit of voltage to each cell bank. 57.6/12 = 4.8v which is much higher than Li likes to go, just something to keep in mind.
  • Post in thread: The Tesla issue - Inverters willing to get down and dirty (voltages of course)

    That range will over discharge a Tesla module as it's only supposed to go down to 18v (18/6=3v per cell) and it'll also leave some capacity unused since the max on the module is 25.2 (25.2/6=4.2v per cell). The top end isn't as big of a deal, the over discharge however will destroy the module...
  • Post in thread: DIY Solar monitoring.

    Here's the thing, you're getting into low level electronics which is even more involved, sometimes ADCs need extra components in the circuit when measuring certain levels. Its even more involved when you don't have a library to use out of the box. Now I'm not saying it is not possible it's just...
  • Post in thread: Figuring out wire sizes

    Wire gauge is mostly related to amperage. Simplest rule is take the max amps your system is capable of delivering and use that to figure out gauge, in your case you can use watts law to get that. I = 400W/12V = 33.3A (Note that I used the rated watts your inverter can deliver, you could also...
  • Post in thread: AC Coupling for off grid applications

    I've done exactly what you mentioned but on a much larger scale. I don't feel like reposting the whole thing here but here's a link to my build https://secondlifestorage.com/showthread.php?tid=7743 A couple things to keep in mind. The battery inverter that will produce the source sine wave...
  • Post in thread: Backfeeding the grid

    That's only on some cases. Some new meters detect power flow direction, if you're not signed up for net metering you just won't get paid for your export, it won't charge you for your export as if it was usage. as always YMMV depending on your meter.
  • Post in thread: Backfeeding the grid

    What are you talking about? Meters measure power in kWh which does flow forward (increases your consumption) or backwards (decreases your consumption). When you say "the solar panels just have a higher voltage" are you referring to the 350-600VDC they produce?
  • Post in thread: DIY PowerWall

    Here's my install. I used a 60kW pack which I paid more for than your 85kW so that's a hell of a deal. https://secondlifestorage.com/showthread.php?tid=7743 Can it be done? Yes. Can it be done after reading this? If you study NEC,Local codes, and Google a ton of stuff probably. If you're not...
  • Post in thread: How to charge battery bank with gas generators but no inverter/charger

    He'll still need something to generate the power, either solar or something turning a rotor inside a stator.
  • Post in thread: DIY PowerWall

    It's not secured in any way. It's just a CAN protocol, here are the details of the packet bytes https://www.elithion.com/lithiumate/php/controller_can_specs.php Or just buy a BMS with the interface already built in like the ones below: SimpBMS...
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