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I did try that. Thanks. I boosted the low voltage cells in each battery but the result didn't wake up the BMS in either. So I bypassed the BMS and charged directly with the Growatt to 54v on each battery. Interestingly, one BMS woke up, the other did not. So I then wired everything up 2P...

BMS is still not working so I am taking another approach. I've connected the Growatt to the battery pos and neg directly without the BMS. It's now charging. I'll keep an eye on it and when the Growatt says the battery is at 54V I will reconnect the BMS and see what happens. I just can't...

I've charged one 48V battery to 3.2xxV on each of 16 cells. I still only get 16V through the BMS. Is this normal? I'm getting nothing from the supplier as far as the low voltage cutoff level that I need to exceed to wake this BMS up. I'll hook it up to the Growatt and see if the battery will...

Thanks. I just followed Will's video for settings for this inverter. I have a lot of reading to do as the owner's manual is written in Greek.

All cells on this battery are at 3.2xxV except one at 2.95 and one at 3.18. I can't find the docs on the bms. Batteryhookup no longer has that bms and they've dropped the item page from their website. Anybody care to guess what voltage will wake up a 16S xiaoxiang SP20S020A? Web search comes...

Thanks fega72. I can access the battery, it is a DIY build from 75aHr cells (16 cells each). I'll look into that however I think I will try to disconnect the BMS from the battery and reconnect first. Charging all 32 cells that way could take weeks (again). Edit... disconnecting the bms...

I have a 48v lifepo4 bank with two 75 aHr batteries wired parallel to a Growatt inverter (3000 ES). They each have a 60A Xiaoxiang BMS. I mistakenly left my EV plugged in too long. I'm assuming the BMS shut down the system. The Growatt shut down and now the battery won't take a charge. I...

Gotcha. Thanks and sorry for the confusion. I'm taking my time and missing a lot of sun trying to build this right. You guys are a big help... especially when I ask intelligent questions : )

I think I understand except on a two battery bank "the same" doesn't apply does it? There's only one parallel wire. On a three battery bank the "same" applies to the parallel wires? Here what I'm planning. The 4awg from B1 to B2 is 19". The 4awg from B2 to the bussbar is 24". Then neg...

OK. Maybe thinking too hard about this but when folks here say equal I think there's some +/- factored into it. So the distance through the BMS to each battery post is not considered?

Yes, I'm messing with the BMS... I'm still scratching my head on how to finish wiring and end up with a diagonal pos and neg across the two battery bank. Not as straight forward as it seems with a prepackaged set.

Longer, not shorter... I'm referring to the negative wires coming off the battery negative to the BMS, through the BMS and then to the battery posts. This length is X2 as I have two 48v batteries in the bank. At that point the 4awg going to the Growatt is equal length with the positive wires...

OK, I get the theory that the + and - wires should be of equal length. But what about all the length of negative wire to the BMS and then out to the battery terminal? If you are equalizing lengths shouldn't that be a consideration? I'm estimating that the extra length going through the BMS...

Thanks Sun Eggo. That's a comprehensive document. Looks like one correct way is to run from each battery to a Pos and a Neg Bussbar and then to the inverter.

I've got two 48v 75 aHr batteries that I am going to wire in parallel to a Growatt 3000ES. Which is the preferred method, or does it not make any difference? A - run Pos and Neg of each battery to two bussbars (+ and -) and then a single wire from bussbars to breaker and then Growatt B - run...

Thanks. Battery bank #1 is fully top balanced. I don't intend to do a capacity test. I'll just build the battery and let it sit until I get # 2 top balanced and built into a 48v battery. I did charge the 2nd battery as four individual 4S 12v packs and they are now sitting parallel at 3.33v...

Thanks again. I'm going to rewire it now to opposing ends and see what happens. Do you top balance to 3.65 and call it good? On my last build, using 32650 cylindrical cells, after getting to 3.6 I'd let it rest and then another short charge until the PS went to <1 amp. I did that two or...

Now we're getting there. I didn't keep track of hours but it was most of a week...

Thanks everyone. Good to know I am following a good procedure. Patience!

I'm wondering about top balancing duration. I've paralleled 16 lifepo4 75ahr batteries and have been attempting to top balance them. They seem to be stuck at 3.34v. They are currently at 3.34v after sitting off the charger for 12 hours (wasn't around to monitor the charger today). The power...

Thanks Bud. I'll try to slow down and not screw up again.

Not sure. Here's a photo of the diode, or what's left of it. The ceramic body shattered and was rattling around inside the case. Anyway. I thought it was damaged as it didn't seem to want to adjust voltage. When I just tried again it would set at 3.6v so I hooked up the batteries...

Not paying attention when wiring for balancing. POS and NEG wires backwards and the diode went pop. I'd really like to "fix" this and not wait a week to get a new PS. Can I bypass the diode to finish top balancing? OK to tell me this is stupid!

LiFePo4 Sorry for the confusion. Bentley, thanks for the suggestions. That is what I thought but I'm pretty much a rookie as far as this size battery. I've done 12v LiFePo4 before. Those were just 100ahr and a 24ahr. Tim

Edited title to correct battery type... I'm building a 48v 150ahr LiFePo4 bank with 75aHr Eve cells. I have two 60a, 16S BMSs. My concern is mostly weight as it will be living in a small, somewhat confined area. Would you build two 16S 75ahr batteries, each with its own 60a bms and parallel...

Thanks again Darren. This system is to charge an EV at Level 1, 12a, 1.4kW. It will also serve as a backup for grid outages to power a fridge and in the winter a furnace, but, never at the same time as I will only have one 120v outlet wired to it. I think I will stick with the 63a breaker. I...

Yes, the plan is to have the breaker as close to the + side of the battery as practical before the inverter.

I'm building two 48v 75 aHr LiFePo4 batteries that I will wire in parallel to a Growatt 3000ES hybrid inverter. I'm using 18" (one way) of 4awg. I'm trying to size a breaker/fuse just downstream of the battery bank. I'm confused by the calculations for determining fuse size. I will pull no...

That sounds very familiar to what I found when researching that problem a couple years ago. And though I do have a Goodman furnace I think I read that most modern high efficiency furnaces have the same issue running off of an inverter generator. I think that's why my previous furnace was...

Super. I'll wire it 6S then. It's a small system but it is just what I wanted to slow charge my EV on level 1. I have both L1 and 16a L2 capability now but I want to charge mostly from solar. I don't typically drive a lot of miles on an average miles per day basis so it should work out...

Thanks again. I miscalculated my array voltage at 3S2P. I used VOC instead of VMP when I designed the array and may come up short on V for my Growatt which requires a minimum of 120v. So I might end up with a 6S array to drive up the voltage to satisfy the Growatt. I hooked them all up as 6S...

Thanks guys. Reminds me of an old saying. Procession of tools does not make you a mechanic! I've got a lot to learn! Setting the 60A to zero results in a very low amp reading. I guess that's close enough to zero to count.

Help please! I thought I had a grasp of series and parallel wiring of panels. Here's my panels. Six total panels in 3S2P. Just three panels are wired together 3S in this group. Voltage makes sense... 118v Amps should be around 6a to 7a in full sun. But, it is reading 18. Why is it...

In the event of an emergency I want to alert emergency services/utility workers that the solar array that they see when approaching my property is NOT grid tied. Does anyone know of a label available to display next to my service entrance to communicate this? Or do you know what wording I...

I'm building two 48v 75aHr Lifepo4 batteries and intend to use them with the Growatt SPF 3000TL LVM-48P or the Growatt SPF 3000TL LVM ES-48P. They both have 80amp max MPPT controllers. If I won't be pulling over 15a @ 120v from the Growatt am I ok with a 60 amp BMS on each battery (two...