Recent content by Tobster

So a one year (or 202 "cycles" since going live late last January, according to the BMS) follow up, should anyone else who has numptastically overcompressed their batteries Google this thread. Obviously, YMMV, take this with a pinch of salt and apply your own judgement and reasoning; there's a...

So does that mean if I pull between 21 and 40A (up to 9.6kW) it'll just shut off the inverter and switch to utility, no bother? I note that the AC Input/Output connections section in the book says to use 8 AWG wires on the 5000, which the internet says will carry up to 50A.

I bought a Growatt SPF 5000 ES, 16x EVE LF280K grade B's and Daly 150A BMS, with the intention of running my house (all of it) off cheap off-peak electricity by charging the batteries overnight and discharging them during the day. The option of adding solar panels later is a nice to have, and...

I've got 16x EVE 280K grade Bs to make a 48v, 13.4Kwhish pack, with a 150A Daly BMS. I intend to charge the cells with a Growatt SPF 5000 ES hybrid inverter during a five hour window of cheap EV tariff electricity overnight, with a 60A max charging current and default 56.4V charging voltage...

So, I'm going with basically loose hand-tightness on the bolts, and will watch the slightly deform cells like a hawk for the first few cycles. The Daly BMS should indicate any major issues with them.

I found a couple of datasheets for the LF280K which had similar but less helpful information. 71.5 -> 72mm for eight cells is 4mm! ?

How thick is the insulation between your end plates and the cells? I only put the OSB there so the cells wouldn't be any where near the 3mm angle iron clamping the plates.

Just those outer ones, right on the edge. Flexible end plates does make sense as the prevailing failure theory now thinking about it; the two middle bolts are spreading their load over both rows of batteries, whereas the end pairs are only applied to the side of each row. "Reject" from build...

Yeah I think basically it's going to be just holding tightness on the six bolts rather than any kind of force. I'm using 1mm plastic sheets (sold far more cheaply as chopping boards!) in between each cell. Any recommendation what state of charge to apply the gentle pressure?

OSB and 3mm angle iron.

Yes; small torque wrench, thumb and third finger light wrist action, *click* - 100kg. To be honest, I didn't believe the calculator either, but I do now!

Hi All, I'm new here, and am in the process of assembling a house battery pack for daytime use of cheap off-peak EV electricity. The pack consists of two rows of eight EVE 280Ah 3.2V prismatic LifePO4s, clamped together with six M5 bolts. There are 1mm plastic sheets between each cell, and then...

How was your experience? I'm looking at batteries and possibly an AC coupled inverter from the same manufacturer.