Recent content by TimC

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...