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  1. 再生可能 エネルギー

    DIY 48V Battery - Form Factor Pros and Cons - Building Two 24V Battery Boxes or One Single 48V Battery Box

    Hi, just doing some brainstorming... I am in the design to build a 16 Cells 48V battery and I am evaluating various layouts for putting together all the cells. My first idea was to make a box with two rows of eight cells. So the box will be about 30" x 18" x 12". But my concern is about the...
  2. 再生可能 エネルギー

    Ground and Neutral connection for Split-Phase Switch Device

    I would like to build a Switch Device to connect a 240V load to either: - the Grid or - a Split-Phase Inverter (which is not Grid connected). I plan to use a separate 2 poles relay to connect the load to one of the power input. This part is straight forward, but regarding the Neutral and the...
  3. 再生可能 エネルギー

    Low frequency Inverters and in-rush current concern.

    I am reviewing for an acquaintance an installation proposal from an installer, not a DIY, for a small grocery store. The daily power grid consumption is 60 kWh, under 220V, mostly to run 8 professional fridges and freezers, and indoor and outdoor lightings. It seems to make sense to use Solar...
  4. 再生可能 エネルギー

    Curious about this yellow pipe

    While doing some digging to repair an older gutter downspout, and looking for a spot to install ground rods, I noticed this empty yellow 3" pipe. I wonder what could be the use of it. I was thinking at first that this could have been an unused electrical underground pipe, but as second...
  5. 再生可能 エネルギー

    How 'Rapid Shutdown' works?

    I noticed this 'Rapid Shutdown' label. Could someone explain to me: - how 'Rapid Shutdown' works? - what components are needed? - does this system is mandatory? - does having the panels mounted vertically against a wall has different rules than installed flat on a roof? Also I tried to...
  6. 再生可能 エネルギー

    48 V Switch Recommendation

    I try to use the best 48 V Switch for my Solar System, to easily disconnect the 48 V battery, the SCC controller, and the DC/AC inverter. I found various information, and I would like to find some recommendation to dictate my choice: - I noticed that many systems use the typical Blue Sea...
  7. 再生可能 エネルギー

    How many T-Fuse are needed?

    I wonder how many T-Fuse are needed for a 48 V DC solar system? - Do you need only one T-Fuse to protect the battery? - or do you also use a T-Fuse on a the negative side of the SCC and also on a the negative side of the DC/AC inverter?
  8. 再生可能 エネルギー

    Please review 48 V DC Wiring Diagram

    The following schematic represent the Off-Grid Solar system that I am implementing. I have two specific loads. The first load contains only 120 V LED lights which are mostly used during night time. The second load will be a 240 V water heat pump to use excess of solar energy, when the batteries...
  9. 再生可能 エネルギー

    Turning on and off DC/AC Inverters

    I plan to have two 48V DC to AC Inverters (1 kW 120V) and (5kW 240V) For better efficiency, especially in winter when there is not too much solar production, I would like to turn the Inverters on only when needed. I try finding inverters with remote control, but in the case of 48V Inverters...
  10. 再生可能 エネルギー

    One of the kind off-grid cabin

    Nothing too high tech, but I found this video showing a simple cabin built in the woods, to be a quite inspirational story:
  11. 再生可能 エネルギー

    Recommendation for: Inverter 48 V DC to 240 V AC Split Phase with Neutral for Water Heat Pump

    I try to find a 48 V DC Inverter to run a 240 V Water Heat Pump in the US. - I cannot find too much information about Water Heat Pump compressor consumption. The information I can find mentioned the 5 kW resistance heating element used for fast water heating, something I will not use, at least...
  12. 再生可能 エネルギー

    Designing a Transfer Switch: Difference between Contactor and Relay?

    I am designing a transfer switch to power a Heat Pump so I could select between using the Grid or Solar Energy, or even turning off completely the Heat Pump for service, or running only on Solar Energy if available and be off otherwise. I try to understand the difference between a Relay and a...
  13. 再生可能 エネルギー

    All-In-One versus separate SCC and Inverter?

    I'm designing an off-grid solar generator for the lighting of a building, so (after reading many FIY threads) I have two main questions in mind: 1. I cannot decide between getting an All-In-One solar generator system versus getting a separate SCC and Inverter? I'm considering getting a "SCC...
  14. 再生可能 エネルギー

    DC Quick Disconnect Switch Recommendation

    I am looking for a Solar PV DC Quick Disconnect Switch and the only model that I can find is the AIMS Power PV array DC Isolator. The only issue that I have with this device is the 32A limitation both - from the use of MC4 connectors. - but also fromthe internal DC switch rated IEC 60947 1600V...
  15. 再生可能 エネルギー

    How to get communication information from an SCC ?

    I noticed that SCC provides numerous settings and communication interfaces. For a DIY installation, I would like to know if there are easy way ways to get status information from an SCC? In my situation, I will be off-grid so my batteries will be charged only from the sun. (A) When the...
  16. 再生可能 エネルギー

    Building my own solar panel junction box

    I looked a various solar junction boxes, but I could not find a particular model corresponding to my needs. - In particular I plan to have 6 PV input strings and I would like to have 2 output lines connected 2 separate SSCs. - Also the junction box will be indoor and not exposed to the elements...
  17. 再生可能 エネルギー

    Securing and Supporting Vertically Suspended Wires

    I plan to use a former internal vertical garbage disposal to carry my PV cables from the roof to the basement of a building. The chute is made of metal and is about 30 ft long and 2 ft diameter. I will have 4 x (AWG wires #8) and one (ground wire). I checked the National Electric Code (NEC)...
  18. 再生可能 エネルギー

    Any recommendation for buying Solar Panels in US.

    I wonder if anyone would like to share some experience and recommendation of (US or Chinese) retailers selling large 400W solar panels, for DYI instalation and for an amount of 20 to 24 pieces. I am located in Northern California.
  19. 再生可能 エネルギー

    Any examples of InfluxDB Cloud to present and store data gathered using Telegraf and shipped to the cloud

    I wonder if any users of this forum experimented and implemented some graphical representation using InfluxDB Cloud to present and store data gathered using Telegraf and shipped to a cloud account? Here is Docker monitoring template sample:
  20. 再生可能 エネルギー

    Any Code Violation Issue for Sharing Concrete Hole Passthrough

    I am relocating a 120V 15A receptacle in a building and I need to run between two floors a 12 AWG Metal Clad Armored Cable inside a drywall. I noticed that there was already a pass-through hole used for a water pipe. Would there be any code violation issue from sharing the same pass-through...
  21. 再生可能 エネルギー

    Charger Recommendation for LiFePO4 backup system.

    I plan to build a 12 V LiFePO4 backup system to power a refrigerator. I would like to run my refrigerator off grid during peak hours (4 p to 12 am, or 8 hours). I plan to build a system based on 280 Ah Cells, and have a maximum discharge of 80%. I plan to charge the battery during off peak...
  22. 再生可能 エネルギー

    Looking for 48 V DC relays

    I builld a 12 V UPS system and I used some relays to provide some remote contol of it. I try now to build a 48 UPS system based on my 12 V design. However, I have difficulty finding 48 V relays. Most of the relays that I found are 12 V or 24 V. I'm suprised that I could not find similar 48 V...
  23. 再生可能 エネルギー

    How much Solar energy with only vertically or horizontally mounted solar panels?

    I need some help to estimate a possible Solar energy with only vertically or horizontally mounted solar panels. I have a flat roof and because of heavy wind situation, I cannot have my panels tilted, unless I design a very strong frame support. So practically my solar panels can only be...
  24. 再生可能 エネルギー

    Would you connect the (-) 12 V of a solar system to the ground or the Neutral?

    When building an off-grid solar system, which can be used as backup for your home,: - Would you connect the (-) 12 V of the battery to the ground or to the neutral, or keep it floating? - Also would you connect the (-) wire of the solar panels to the ground or the neutral, or keep it floating...
  25. 再生可能 エネルギー

    UPS (Uninterruptible Power Supply) Refrigerator Project

    Hi, I currently live in an apartment, so it is difficult to make a Solar Panel project, however because I just bought an Electric Car, I have ToU (Time of Use) electrical power rate, which is about $.50 / kWh at peak time and $.10 off peak at night. I would like to learn about making batteries...
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