Earlier quoted context omitted.
Yeah, lead wins hands down. This is a few years out of date now, but when speccing out my system I did a bit of analysis of battery types. We went with OPzS, and so far, so good. https://docs.google.com/spreadsheets/d/1w8vPBHkMyY5jvkxtK1Qh...
Recycled Lithium Ion is much cheaper still, but more risky (and less maintenance). You'll have to do some pretty fanatic inbound QA to determine whether all your cells are safe to use. but if you do that and fuse your cells individually you should be able to make that work.
DIY Off-Grid Solar Power
161–170 of 234 posts
Re: DIY Off-Grid Solar Power
#162Earlier quoted context omitted.
I have seen enough of his videos to know that he can be spectacularly wrong (dangerously so) about some of his stuff and if you are not already very knowledgeable about this then you may well end up following some very bad advice. This guy has far more practical experience and seems to be less error prone, and also does not shy away from showing when he gets it wrong, which is often far more valuable than a polished…
Quoted post unavailable.
Re: DIY Off-Grid Solar Power
#163Earlier quoted context omitted.
I can't recall particular instances but I've seen the same before. FWIW he's getting less stuff wrong over time.
Like what?! Can't any of you people backup your claims. It's just empty complaining on this site without evidence. It's driving me nuts. Show me what I said or have done that was wrong.
I'm happy for you and your success and I'm very happy there are people out there like you changing their life outcome out of sheer will, while providing the community with unbiased product reviews and independent tests.
Please don't take the criticism as a personal attack. Unfortunately, I just don't recall which information you said at some point that made me cringe. Like I said, I've watched a lot of your videos and haven't had any cringe moments like this for a while now.
EDIT: also fyi, this website has an automated banning process if you're a new account with too many downvotes. Unfortunately, the few messages you've written have a confrontational tone that usually attracts a lot of downvotes. If you care at all, may I suggest that you avoid that tone/style. I'd love if you posted here in the future. Take that as you will.
Re: DIY Off-Grid Solar Power
#164Why no love for victron HW? My RV is wired up along with 7.2 KWh worth of battleborn lithium.
Re: DIY Off-Grid Solar Power
#165I recently set up my own off grid solar system in a tiny cabin that I designed and had built. I used the Solar Controller+Inverter Combos recommended on this site (Growatt) but ultimately switched to ones by Renogy. The Growatt one I purchased has a wifi adapter and app - wifi requirement was a deal breaker when remote. The renogy one has a Bluetooth adapter and app, plus feels better designed (though actually I thin…
Which is why you want to install disconnects between your battery bank and the electronics. In a worst-case scenario of total discharge you can then bypass the dead batteries, hook the control electronics up to car batteries if necessary (be careful about voltages) and perform some diagnostics or at least read the logs of what went wrong. But the controller+inverter should be running if supplied with voltage from solar/wind/generator regardless of how the batteries are doing.
Re: DIY Off-Grid Solar Power
#166Earlier quoted context omitted.
Sure, but I will have to go through a couple of months worth of youtube history, I was binge watching anything about Lithium Ion when I was working on this: https://jacquesmattheij.com/long-range-ebike/ As a result I have a very long article on Lithium Ion battery safety and pack construction in the works, but exactly for the reasons the GGP lists I'm pretty careful about releasing that, I want to triple check everyt…
Just because I am young doesn't mean anything. I know what I'm talking about. I started coding and building robots when I was 13, and circuit design at 15. Solar power is dead simple. Yeah I can work with raw terminals because I don't make silly mistakes. I've been working with low voltage DC for decades. Most of the systems I throw together are for educational use. Those balance wires were probably a rapid prototype…
This attitude will cost you dearly and is exactly the difference between being a responsible educator and someone who probably should pause to ask themselves if they are on the right track.
You are setting a bad example and many thousands of people will follow in your tracks adopting your very unsafe practices as though that's the way to do it. Some of them will end up hurt.
It pretty much validates my earlier assessment but I'm actually a bit surprised that you would come out to make it so obvious.
> Those balance wires were probably a rapid prototype pack where I was testing something.
Yes, but that's not what matters here. What matters here is that people see you work and believe that's the way it's done. With authority comes responsibility.
> And wow you're so dramatic about the balance wires why don't you criticize the companies that offer their pack configurations in ways that you complain about?
That's whataboutism. We're discussing you, not some company. These tricks don't really work on HN.
> There are many companies that throw these packs together and sell them to unsuspecting people, and you are giving me a hard time when making a quick pack to educate or test something?
Yes, I'm giving you a hard time because you are at the same time claiming to be educating and you are advocating unsafe practices while doing so.
> Give me a break
Unlikely, and after this comment far less so.
But thank you for clearing up any ambiguity about where your feeling about responsibility lies.
Re: DIY Off-Grid Solar Power
#167Earlier quoted context omitted.
Recycled Lithium Ion is much cheaper still, but more risky (and less maintenance). You'll have to do some pretty fanatic inbound QA to determine whether all your cells are safe to use. but if you do that and fuse your cells individually you should be able to make that work.
but still main problem is subzero temperatures. recycled lipo batteries do not become immune to this problem.
Re: DIY Off-Grid Solar Power
#168Together with my girlfriend I’m planning a trip. Driving from the Netherlands to South Africa and back with an EV. We want to charge the car with solar panels we bring with us. See our website for more details: www.4x4electric.com Challenge for now: how to charge the car with ~60m2 of flexible solar panels. We need a threephase offgrid solar system, but did not find a suitable solution yet. Any ideas?
Re: DIY Off-Grid Solar Power
#169Marketing. I would take everything on this website with a grain of salt. Take it from someone who has actually built an off-grid system, one that is relied upon for 24/7/365 living rather than mere vacation cottage. For example: OP re lead-acid battery options: "Heavy, cheap, easy to use and they work! Typically will last about 3-5 years. Slower charge rates than lithium, much heavier, and they cost way more in the l…
I can believe that lead-acid batteries in a thermally-regulated and immobile location would have a longevity advantage. But what magic dance are you doing to get car batteries to last longer than 5 years? I - and my parents, and seemingly everyone else I know - absolutely do seem to have to replace them at just about exactly that interval. That's not to say they aren't filling their role in a totally reasonable way,…
Re: DIY Off-Grid Solar Power
#170Marketing. I would take everything on this website with a grain of salt. Take it from someone who has actually built an off-grid system, one that is relied upon for 24/7/365 living rather than mere vacation cottage. For example: OP re lead-acid battery options: "Heavy, cheap, easy to use and they work! Typically will last about 3-5 years. Slower charge rates than lithium, much heavier, and they cost way more in the l…
That's interesting. Winters are cold where I'm originally from, and car batteries get replaced more frequently than once in 10 years. Where are you from? Your experience is very different.