January 7, 20197 yr Hello to all, I'm new to the forum. I do have my own residential solar/ backup system working and would like to share some knowledge to the community.
January 8, 20197 yr 19 hours ago, vandyh said: Hello to all, I'm new to the forum. I do have my own residential solar/ backup system working and would like to share some knowledge to the community. Welcome and please share. I'm in your "valley" so it would be nice to hear your experience.
January 8, 20197 yr Hi @vandyh and welcome to the forum. Please feel free to share your knowledge, or learn from others if you have any questions
January 8, 20197 yr Author My system as follows: VE Multiplus 3kVA, 48V INV/CHR with venus GX Fronius Primo 3kVA GTI connected on AC-out of Multiplus - controlled via frequency shifting to have PV power in the event of mains failure 2 PV string, totalling 3,570kWp that can generate up to 22kWh on a good day. 48V 100Ah DIY Li-ion battery system with recycled 18650 cells - still testing them out Batrium BMS connected to Venus GX via CAN-bus - still some issues to sort out here My system is not 100% working and I need some help here and there as there. A few photos of my setup below
January 8, 20197 yr 8 hours ago, vandyh said: 48V 100Ah DIY Li-ion battery system with recycled 18650 cells - still testing them out Now that is exciting! I've watched youtube videos on this topic, but seems way too much effort for someone that know too little about it, and no source to buy from.
January 8, 20197 yr Very nice . 100Ah is that enough to get you through the night? What did your cells capacity average out at? Looks about a 100s packs
January 9, 20197 yr Author 14s60p 18650 cells all of them Samsung 2800mAh Edited January 9, 20197 yr by vandyh
January 9, 20197 yr Author 15 hours ago, seant said: Very nice . 100Ah is that enough to get you through the night? What did your cells capacity average out at? Looks about a 100s packs I've charged them up and discharged one at a time measuring the mAh of each. I've then packed 60 of them in parallel adding the mAh to have 100Ah Edited January 9, 20197 yr by vandyh
January 9, 20197 yr Author 2 hours ago, Javi Martínez said: Did you label all cells with their capacity? Good Job! Yes I did. testing them took me almost 3 months... So I've made my own Arduino tester than can measure 4 at a time and I bought a few 4-bay charge/dischargers to speed up the process. Old cells has to be tested before using it in a pack. I had a few that charged up to 4.2V fine and then discharged to 3V with <20mAh
January 9, 20197 yr 13 minutes ago, vandyh said: Yes I did. testing them took me almost 3 months... So I've made my own Arduino tester than can measure 4 at a time and I bought a few 4-bay charge/dischargers to speed up the process. Old cells has to be tested before using it in a pack. I had a few that charged up to 4.2V fine and then discharged to 3V with <20mAh Great!
January 9, 20197 yr 100Ah from a 60p pack is ok but if the batteries started out as 2800mAh they have lost a lot of capacity , not too sure I would have put them into service . See how they go , you can monitor them nicely with the Batrium. Maybe get processing at least another pack 60.
January 10, 20197 yr Author 12 hours ago, seant said: 100Ah from a 60p pack is ok but if the batteries started out as 2800mAh they have lost a lot of capacity , not too sure I would have put them into service . See how they go , you can monitor them nicely with the Batrium. Maybe get processing at least another pack 60. Sean, yes they lost some capacity, as I've used tester cells from 1400mAh - 2600mAh in the packs. fully charged they should hold 5.5kWh The Batrium works wonders (just expensive for us here in SA). I'm getting things ready to make another set of packs, but +10kWh this time with better cells...
January 10, 20197 yr Excellent, I love to see that more recycled packs are being built and used safely.
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