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Hello!, I have two Pylontechs UP2500 ("24V" 100Ah) and I am currently calculating the SOC with an external shunt and a raspberry pi. My SOC solution is inaccurate so it syncs to 100% whenever the system is full. Yet if a whole week passes by and the battery oscillated (ie between 20% and 75%)...

I'm having discussions in my head regarding how many watts would I gain if I put my panels in the correct angle. I have 6 panels on a 10th floor roof that has lots of wind. I went with the simplest and safest approach and made an horizontal structure. Panels are 100% horizontal. They produce...

I finally got an LFP battery ( pylontech 100Ah ). I was using a lead acid bank (LOTS of small SLAs and a pair of GEL) heavily degraded ( around 480 Ah total from which I was able to pull 90~110 Ah ). I would like to purchase more pylontechs but I don't think that will be possible for a year or...

** before I forget: my grid runs at 220VAC, single phase. ** I have bought an 8 pin relay. The purpose is this: I want a small fridge to run on solar by day and use the grid by night. This would save power during the day and preserve my already-very-small lead acid bank when no power is being...

expensive and custom built LiFePO4 batteries are SLOWLY becoming available here in Argentina. Before I get too carried on putting my sky mask grabbing the rolling pin and heading to the bank asking for donations... I have a cheap MPP solar clone inverter that is not compatible with lithium...

If I insult you and delete it, did I insult you? If I threaten to harm you and I delete the threat, did I threaten you? Where is the world going with all these "self destructing messages"; the possibility to recall sent (and read!) messages. The messaging platforms suddenly lost reliability...

Hello there, I'm trying to make a simple kettle heater of sorts. That is, a somewhat heavy, flat base with the coil, that get's hot so you rest a kettle on top. I'm bad at describing things and I don't speak english as I would like. I never used kanthal before and I'm not exactly sure how to...

I'm building a 24V lead acid battery bank and I was going to mount both positive and negative bus bars onto the wood structure that will hold the batteries in place. I saw a thread recently where a user shared a near disaster experience where wood planks were in contact with LiFePO4 cells. My...

Hello, this is probably a silly question. I'm not familiar with systemd networkd nor any other manager. I want to create a bridge br0 with eth0 and eth1 (usb addapter). I can do this with bridge utils using two simple commands: brctl addbr br0 brctl addif br0 eth0 eth1 This method lacks...

This is my current setup: - 4x 350W mono panels - 2x 400W mono panels - EPEVER XTRA 4415N SCC - battery bank: Lead acid. Greatly undersized. (Used as UPS backup for 1~2 hours blackouts a few times per year.) - Inverter: 48V online UPS (I had it before getting into solar). 2kva ( 1.4 kW ). Last...

I have two problems. - One of them is that I have 4x 12V alphacell 165GXL batteries in series (48V) and one of them failed. They should be new and I barely used them except for testing. No warranty, I'm afraid. - Second, I live in Argentina (rank 149 out of 180 in economic freedom). I can't...

It all started around 2018. Just like Homer Simpson building the circus tent with puree while dining it struck me: I've always wanted get into solar, why wait? "I'm already grown up, I have a job and I definitely want to" I told myself. So after coming back from vacation, around march 2019 I...

Short version: One out of four batteries in series drops to 10.5V after a few amps. ---- A little background for context: I have a bank of 4 alphacell 86A deep cycle GEL batteries that I got as new (unused) a year ago. Since I'm not living offgrid I've been using them pretty much as a super big...

... you build your own relay out of scavenged stuff, but of course! So, I started from an HP laser printer solenoid. I attached it to a plastic scrap. I'm a fan of two components glue, as you can see. The contacts are small pieces from the smaller saw blades. I applied sand paper and...

Hello! I got into solar in an unusual way: I wanted to use an UPS I already owned as my inverter. So I made my first purchases based on a sellers advice trying to match my budget and my technical requirements (48V. Since my UPS runs at 48V). At this point, I was aware of some of Will's videos...

Hello Everyone! These are my batteries. I have 4 of these in series. My maximum nominal power consumption is around 500 W/h. I'm trying to understand if the batteries will do fine or if they're being overdrawn. I take it that my system is very small so I guess they handle it just right but I...

Hello everyone, I'm in need of some help. We've been using PPTP VPNs at work for the past years. I know it's not very secure, but it did the job. Our employers are not fond of working from home at all. So the VPN was used for a few exceptions. Something you might or might not know, is that...

*only works for cold water circuit. Stated 98% efficiency reached under test lab conditions without rain.

Hello everyone, After almost a year working with my electrical installation, UPS, battery bank, and DIY battery monitor and such, I'm close to the last phase of the project: Putting the panels in place. I have a few constraints that I want to state before going into further detail: - The roof...

Hello everyone, I have 4 alphacell 165 GXL in series, currently hooked up to my UPS. No solar panels yet. I've noticed that the positive terminal from the series is getting sulfated / rusty. I'm clueless of what could be happening. this is how it looks. All the other terminals look like...

Hello everyone, I'm still kind of stuck adding some kind of intelligence to my still-not-implemented solar project. I'm afraid I have no serial/USB/Ethernet/Bluetooth enabled devices that would help me out with some readings. I'm working with 48V. I need to read the DC voltage at my solar...

I was curious enough to go search LiFePO4 batteries at my "local ebay" (we don't have ebay here, but this site). u$d 1 =~ ar$ 61 That means, each one of those 12V 100Ah batteries cost u$d 1565. Next time you're sizing your battery bank... make the math of the investment you should face if...

Hello, my name is Agustin. I'm from Buenos Aires, Argentina. I'm in the 30-40 y/o range, I work in IT, and I have a thing for solar energy since I asked my father about it when I was a kid. I've been reading the forum a bit (after watching quite a bunch of Will's clips on youtube) so I think...