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I have an electric zero turn lawn mower with a 24kWh battery. I also have a small shed where the mower can stay when not in used, the roof is about 4m x 3m, enough for 2.4kWp (I don’t think I need that much). I was making a consideration; the lawn mower is mainly used in the summer because is...

I have a Sofar ME3000SP which has a CT clamp to limit the export to grid. As a consequence, I have a steady import of around 5-10W. I measure this through a different device and I receive a Home Assistant notification when it exports for more than 20 seconds. I noticed that there are a couple of...

I have mounted a couple of solar panels on my garage (almost) flat roof. When it rains there is a puddle of water forming around the lower part of the panels (the inclination is not enough to allow water to escape) and when water dries, it leaves behind some dirt. How can I avoid this?

Hello, I was happily monitoring my Seplos BMS in Home Assistant using esphome https://github.com/syssi/esphome-seplos-bms It stopped working a few days ago showing all entities as unavailable; I spent days trying to fix it on the Home Assistant side with no success. Today I tried using Battery...

I’ve recorded myself trying to insert the metallic bit into the plastic bit; I’m supposed to hear a click but it doesn’t happen, and when I pull it out there is a metal bit coming out. Am I doing something wrong or have I got really bad connectors?

After watching this video I’m a bit concerned that my isolator switch will go up in smoke when I turn it off under load Does the fact that those panels were short circuited make things look worse than they would normally be? I am only connecting two 405W panels in series, what kind of PV...

I have a grid tie Sofar ME3000SP connected to the grid and to a 48V battery. At the moment it’s charging the battery at night at a cheap rate and discharging it during the day. The inverter communicates to a Seplos BMS. Can I add a Victron Smartsolar MPPT and a couple of solar panels to harness...

I have found some solar panels on ebay, Trina 540W for £80 (offers accepted) The seller says they are solid on the front, cracked on the rear but 100% working. Is this a good buy?

I'm planning on mounting some panels on the ground for an off grid or grid tied system (but without being paid for export) My house consumption doesn't change much between summer and winter. While it obviously makes sense to point them towards the south (rather than east+west) to maximise daily...

I'm planning on building an off grid 12kW system with 30kWh battery. The panels I'm looking at have an open circuit voltage of ~50V and I was going to create two strings of 12 panels each, but I can't see many MPTTs accepting 600V, so maybe I need to limit myself to 9 panels per string, 10kWp...

I'm looking to buy an off-grid inverter for a 12kW system I plan to install. I've read the manual for a Growatt SPF6000ES and I don't understand a couple of things. The manual mentions that overload bypass does the following "when enabled, the unit will transfer to line mode if overload occurs...

I want to design and install a 12kW system at my parents' place; the solar panels would be on the ground as there is a field with plenty of space and also to avoid having to work on a roof (which is also not too big and has a chimney). I worked out a 12kW system with 15kWh storage to be the...

I have been using my EVE LF280K from Fogstar UK for almost a year; I tested 4 or 5 of them when new using a Zketech-EBC40L and they were all around 278-280Ah (charging to 3.65V with 14A cut off and discharging at 40A up to 2.5V). I have been using them with a Seplos BMS, I normally charge them...

I have a Sofar ME3000SP which I’ve so far (no pun intended) used in lithium mode with communication to the Seplos BMS. I’m trying to use it in general mode (intended for lead-acid batteries) and it has these parameters Overvoltage protection (V) Max charge voltage (V) Low voltage protection...

I’ve been chatting to a Seplos engineer to try and understand how to make this work, and according to what I’ve been said, this should work. I’ve placed temperature sensor 1 just above the heating pad, and temperature sensor 2 in a glass with ice Temp 2 is 3°, so it should activate heating...

I have been using my battery for almost a year with compression but with 2mm foam between cells (it's underfloor insulation, kind of polystirene). Now I've separated the cells because I'm moving them into an unheated room and I need to put heating pads below each row. Since the heating pads are...

I’ve been using the Seplos BMS 10E for almost one year and I’m moving the battery to a non heated room, so I want to use the heating pads that I bought with the BMS to make sure the temperature doesn’t drop too much. In this video they are placing the temperature sensors between the pads and...

I am using a Seplos BMS with a 280Ah 48V pack made of LF280K cells (the one with double stud terminal) I have an active balancer but I’m not using it at the moment I’m charging at night with 50A, then when one of the alarms is triggered it switches to 9A and then lower the current to stay at...

I just charged my battery and I'm having the Seplos BMS keeping it at 56V to balance it. You can see the on/off state of the active balancer (turns on at 55.2V); the voltage differential is increasing instead of decreasing. The balancer is this one...

I have a 16s battery made up of EVE LF280K (the ones with the double thread on each pole) I have noticed some high resistance between terminals (including connections) of adjacent cells of up to 0.65mΩ (calculated using voltage drop at known high current) I manage to bring this down to about...

I have just bought an active balancer that I only want to turn on at a certain voltage level using a Home Assistant automation. I was thinking of using a Shelly1 Plus, which has a dry relay contact and can be powered by 110-240V AC, but also 24-240V DC. Do you see any problem or risk in...

What open and close starting voltages are you using for passive balance? How do we determine the optimal voltage? I was thinking that if it’s too high, the cells will have less time to balance and if it’s too low they might balance at a too low state of charge, potentially undoing the top...

I have a Seplos BMS 100A, new version 10E This bms considers 100% when the single cell overvoltage protection or the total voltage overvoltage protection is triggered I have these set to 3.5V and 56V respectively Today I started charging when I was at 80% at 50A; after 1 hour the voltage was...

I have 16 EVE LK280 Grade A which I had top balanced about a month ago; they are normally all at the same voltage at high state of charge, but a couple of times I took them close to 10% SoC (which is as much as my inverter would let me) and noticed a 180-190mV imbalance with a 8A load; the...

Can someone explain why this setting is set to 63V? What’s the purpose of it? I’ve seen videos where people don’t change it so I guess it’s fine, but why? That’s 3.93V per cell if they are all balanced!

I’m top balancing 16 EVE 280Ah cells; I’m doing 8 at a time because I don’t have enough busbars and I’m using a Zketech EBC-A40L; I’ve set the voltage to 3.65 and the cutoff current to 14A (0.05C), is this current too high? Should it be something like 1A?

I’ve bought a length of 25mm2 cable and I’ve tried to crimp a connector My crimper is metric and can be set to 50/35/25/16/10/6 mm2 The connector that came with it are AWG 4/6/8 I first tried the 25mm2 cable in one of the biggest connectors (AWG 4), set the crimper to 25, crimped it and the...

Ehm, I guess most of you have been there, realising you need almost as twice as busbars to top balance. Should I just do it in two banks of 8?

Hi all, I am looking for something to charge my 14kWh diy battery during the night and discharge during the day (UK, no solar panels); I have a Seplos bms I had my eyes on a Sofar ME3000SP, I found one locally but was lost in transit I tried to look for one on Alibaba but one seller doesn’t have...

What is an off-grid inverter? For regulatory reasons, I need an inverter that cannot export energy to the grid I think I have a general idea of what an off-grid inverter does, but correct me if I’m wrong: it’s connected in series between the grid and all of my loads (it has an AC in and an AC...

I'm trying to size the cables from the battery to the inverter. It's a 16S 280Ah; the inverter will be pulling max 65A, so I've thought of sizing the cable for 100A and use a 80A fuse. 48V, 100A, 1m, 3% voltage drop gives me a minimum of 25mm2 (AWG3) if I were to use a twin cable (the BMS...

I’ll soon be top balancing my 16 EVE 280Ah. Since I will later want to compress them (just a snug fit) when at 30%, is there any point in discharge them to 30% while still connected in parallel, then connect in series and compress? Would this make top balancing pointless? Is it better to top...

I just bought this rack which fits the space I have available; is there any problem in having a cable going from the top to the bottom shelf for a 16s connection?

I'm trying to google and find the Y cables to connect to multple terminals on the bms but nothing comes up. What are they really called (in the UK perhaps)? Can I buy them or do I need to make my own?

I just ordered a Seplos BMS with heating pads, which I don't know if I'm going to use If I were to keep my 280Ah cells in a garage that is currently at 0deg C, how much energy would I need to keep them at a safe temperature? Batteries will be constantly charging (night) and discharging (day)...