diy solar

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  • Post in thread: Resources for beginners

    One valuable part of the DIY Solar forum is the Resource Section. This has many valuable links to Papers, Manuals and websites having to do with Solar and Batteries. https://diysolarforum.com/resources/ A sub-section of the resources is dedicated to resources for beginners that has a series...
  • Post in thread: Filterguys big announcement

    A new phase in my solar journey Anyone who has followed me on the forum knows I have a passion for moving DIY solar forward and for helping people learn. I have had my frustrated rants (for which I apologize) but my intent has always been to be helpful and move the DIY solar space forward in a...
  • Post in thread: Figure out what you need before you buy damn it.

    [RANT MODE ON] I can understand when people don't understand the terminology. I can understand when people don't understand the technology. I can understand when people ask questions that show they are clueless about solar & batteries. I would even say I enjoy helping these people...
  • Post in thread: Zero Eport and the EG4 18Kpv

    There has been a lot of discussion about ‘Zero Export’ on the 18Kpv and I would like to summarize what is going on. General Points: The term ‘Zero Export’ is used throughout the industry to talk about preventing power from being exported to the grid. The reality is that Zero Export is a bit...
  • Post in thread: Complete guide for 48V using EG4 18k

    This is an offgrid design I recently helped someone do:
  • Post in thread: Hooterville Co Op noticed my EG4 Solar A/C with 2700W ground mount panels - need advice on response?

    That seems pretty straightforward. Just tell them it is hooked to an EG4 24K Solar Air Conditioner and there is absolutely no connection to their grid. Then give them a link to the product. Part of me would want to be a bit more private and just tell them it independently powers an...
  • Post in thread: 48V Server rack battery price comparison.

    After Will's review of the Trophy server rack batteries, I looked up US pricing on several different 48V server rack batteries. Edit: Corrected it to Wh (Not KWh) EG4 LiFePower4 48V 100Ah – 5.12KWH (Feb 13 '22: $1499 + shipping - $0.29/Wh) Jackiper 48V 100Ah – 5.12KWH (Feb 13 '22: $1699 +...
  • Post in thread: How does your inverter deal with ground.

    Folks, When setting up an inverter, one of the more important safety things to get correct is the grounding and the neutral-Ground bond. All of the inverters have a grounding lug All of the inverters have a ground connection on the AC out. Some inverters have an AC in and when they do they...
  • Post in thread: DIY Tinned-Copper bus bars

    I did not like the thin buss bars that came with a set of cells I purchased, so I decided to make my own. I purchased .25" x .75" copper bar from a local metal supplier, cut and drilled them and then electroplated them with tin (They are destined for a boat). I had never done...
  • Post in thread: Complete guide for 48V using EG4 18k

    Depending on the needs of the system, the EG4 18Kpv can be a reasonably straightforward install The above diagram assumes you are doing a whole-house backup and works for up to a 200A utility feed. The inverter goes between the utility meter and the existing breaker box. The inverter will...
  • Post in thread: Filterguys big announcement

    That is a fair question. If I thought my role was going to be ceremonial, I never would have agreed to it. I am a technical consultant and will be helping them on a wide range of topics based on my technical knowledge and experience in the DIY space. This could be about product...
  • Post in thread: Hooterville Co Op noticed my EG4 Solar A/C with 2700W ground mount panels - need advice on response?

    Be sure to make the popcorn before they turn your power off!!! ;)
  • Post in thread: More interesting cycle life data

    Here is an interesting chart on Cycle Life: Look at the charge and discharge rate. 1C for both and they still lasted over 4000 cycles before they hit 80%. In a typical solar installation, the charge and discharge rate won't be anywhere near that high. I can easily imagine a cycle...
  • Post in thread: EG4 new AIO rated 12K output and 18kPV aka "EG4-18Kpv-12LV"

    Screenshot from wills video: All the neutrals go to one busbar - Clearly common-neutral. I have said for a long time that common-neutral is the best way to go for stationary systems.
  • Post in thread: Bonding and Grounding Solar Components

    This will be my last post on this thread. Please stay civil with each other. Disagreement is a good starting point for helping people learn, but if I believe someone is wrong, attacking them personally does not convince them to rethink their position. Instead, it pretty much eliminates the...
  • Post in thread: How do you ensure you are getting a cold weld in a crimp?

    I love excuses to buy tools but that is a stretch.... I don't think I could sneak a Neutron Imaging system past my wife!! ?
  • Post in thread: Wow is all I can say

  • Post in thread: Future of DIY LiFePO4 looks bleak…

    The OP is not saying there is no reason for building your own battery. There are many reasons to do a DIY battery, the price being an important one. He is just pointing out that the trend line in the pre-built batteries is rapidly changing the price part of the build-vs-buy equation. The...
  • Post in thread: EG4 new AIO rated 12K output and 18kPV aka "EG4-18Kpv-12LV"

    That was my first reaction as well. However, when I look closer at the data sheet, things seem more reasonable. The spec sheet says The 50A rating is at 830Vac. It is not specified, but at 240V it will be able to break higher currents and still meet the 30,000 electrical operations...
  • Post in thread: Complete guide for 48V using EG4 18k

    BTW: Here is a slightly updated diagram. 1) Added the current transformers. (These come with the 18Kpv) 2) Added the CANbus cable to the batteries (This also comes with the 18Kpv).
  • Post in thread: DIY Tinned-Copper bus bars

    Sorry... I did not take video as I went, but here is a little bit about what I did: I am not an expert on any of this!! I learned as I went. This link has the Tinning instructions: http://transistor-man.com/electroplating_busbar.html Warnings: Do this at your own risk. Muriatic acid is...
  • Post in thread: Some Modeling to go with Will's current sharing videos.

    Warning: I go full propeller head on this post!!! ? @Will Prowse just released a couple of videos about hooking parallel batteries together. One commenter claimed 4 batteries in parallel but hooked up 'Diaganaly' would stay balanced. 2 batteries in parallel with diagonal connections is...
  • Post in thread: Top AND bottom balancing?

    A set of cells can only be top ballanced or bottom balanced. Not both. - If you top Ballance and then bottom balance, they will be bottom-balanced and they will NOT be top-balanced - If you bottom balance and then top balance, they will be top-balanced and NOT be bottom-balanced. For home...
  • Post in thread: Eg4 inverter future

  • Post in thread: Dad Jokes (let's hear your worst! ;-)

    What is the difference between inlaws and outlaws?
  • Post in thread: A heads up about some server rack batteries.

    I am seeing posts of people wanting to build 48V systems with 5 or 6KW inverters and server rack batteries. This is a nice, clean way to build a system, but be aware of the current limits on a lot of the server rack batteries. I just saw this for the Pylontec batteries: A 5000W inverter...
  • Post in thread: Loads and battery on common DC bus from SCC.

    Warning: The following explanation is very simplified, perhaps overly so. However, it is a reasonable first approximation way of thinking of it. The SCC, Battery and Load are all in parallel. If the voltage of the SCC is greater than the battery, it will drive current into the battery...
  • Post in thread: Safety hazard w/ Growatt 5000ES (European version) when connected to American grid

    Thank you for alerting us to this @Will Prowse There are several fundamental problems around grounding on DIY projects. 1) Many of the inverter manufacturers do not provide adequate documentation on how the inverters deal with grounding. Growatt and MPP are among the worst at this (I have...
  • Post in thread: Must battery cables be equal length?

    I would not think that would work well. The Wiring Unlimited resource you linked to had this pic: (This is page 19.... but the discussion before page 19 is also important to read. The key is to try to make the round trip resistance from the inverter to each battery and back the same for all...
  • Post in thread: Full Disclosure

    My take is that Will cares deeply about being an honest, transparent reviewer and that drives his actions accordingly. It is hard not to take the undeserved criticism seriously when it strikes at something he cares deeply about. Conversely, if he was the type that didn't care about what...
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