Endless Sphere

yes all DC circuits should have a Common Reference, tied in with Negative Returns

Aha I thought you meant electrical isolation, like diodes or circuit protection between groups

rather than physical protection, insulation

But why?

How many watts for how long are needed?

Even a low Ah pack will deliver much more power than you could with a reasonable PSU

and if warm, then fully recharge in 10min or so, without losing too much lifespan.

So two more normal PSU/chargers, two packs, swapped out. . .

If by group you mean (as is standard) cells in parallel only, at the "lowest" level in the layout at 1S voltage, then those (cell) groups connected together to create one series string then No there is no current flow possible between those groups, they do not affect each other even if at ...

Think of each section (sub pack?) involving strips, whether soldered or welded as a rigid monolithic block, no flexing stresses allowed at all. Then the flexible wiring with zero solder involved, connecting between those blocks, their connection ends well supported so the crimped terminations are (o...

You'll get longer range (higher actual Ah capacity) by paralleling for the whole ride.

Better current flow, less voltage sag and longer lifespan too.

I am not talking about strip, at all. I am saying, where you are using the wire I spec'd to accommodate flexing, abstain from touching that wire with any solder. If you are connecting wire to strip, then do so via solid connectors with a wide contact surface area crimped to the wire, perhaps quality...

another http://www.mekacademy.com

No solder terminations, use crimp connections.

Again, no flexing until you get well into the insulated wire body.

LFP is only rarely used for EVs. Much longer lifespan, thus better value by far much safer, thermal runaway (boom, fire) less likely but also lower energy density, thus slower performance and/or lower range. Tesla using it in the China-produced models only. Otherwise the 3.6 - 3.7Vnominal chemistrie...

Fine-stranded tinned wiring, ideally marine grade UL 1426 rated (BC-5W2 usually 105°C)

No movement at terminations obviously, just leave slack in the length portion.

There is a huge difference between "rough" discharging packs for storage and needing precise CC regulation for accurate capacity testing of individual cells. The purpose of using chargers like FMA PL and 4010 is to get the latter control functionality. Apparently at that 2-4V discharge ran...

spinningmagnets wrote: generic sine wave 500W for $80

Wow lots of flexibility there!

Apparently can order 72V input and output 240V 50hz

EV packs for multiple uses, off grid living, get away from inefficient USA appliances.

A more stable imports source would be ideal, not sure if SPIPOWER is the canonical branding

Yes as stated, the only grid connection being your bank charger, makes for a very simple, inexpensive and safe design. No aircon obviously. There is no need for any 3-way switch, just power off your mains charger and there is no input from the grid. The SC will always be active. ______ I also read t...

Some towns/counties have a few Hazmat disposal days per year where they accept most anything

This looks like a good seller?
https://www.ebay.com/itm/313014455885

That's a bit too strong, overstated IMO but yes, this use case is not motivated by too many practical benefits. But getting off the grid completely is IMO a fine goal if you can afford it. I lived that way for decades, but in a place where just connecting to utilities would have cost more than the l...

In my experience asking dealers, they only supply the software and license to paying customers, either buying the hardware or retaining them on an annual service contract. My impression was the goal is to reduce the value of secondhand units in circulation. I don't understand why there aren't freela...

if they had a bluetooth bms like the Ant bms you could set the lvc at 2.5v program balancing to start at 2.8v I've never heard of a protective BMS that bottom balances. Only dedicated balancers ( marketed as "non-protective BMS") or node charging can middle or bottom balance afaik > i thi...

if you top-balance at 4.2V and discharge to 4.1V, the cells will necessarily be closer than if you top-balance at 4.1V and discharge to 4.0V. Not practically relevant, just refuting the claim that top-balancing at 4.2V would "throw the pack out of balance" But it does do that! In my case ...

Node chargers are a different category, maybe you don't think they are useful in general but if you want to say it is a bad node charger, then specify those that are better please. It puts out a pulsed current in order to measure the "reverse bounceback" delta, kind og like getting a bead ...

A smart charger seems to be a possible answer, as that will be the way to keep the solar power and the grid power seperate with energy only flowing in one direction. I wonder how much a charger would cost that can provide a 48v 40amp charge and be able to turn on and off automatically at predefined...

Yes of course if you have grid power available anytime on demand

and doing so does not violate your goals

then just a couple of dirt cheap FLA GCs will do, and keep the moto side simple and separate at 96V

goatman wrote:still waiting for someone to tell me the right term

It's your baby, you name it.

Balancing with unmatched cells is inherently temporary. It doesn't matter if you top balance at 4.1 or 4.2V, or bottom balance at 3.0V -- the pack will only be balanced at the voltage you balanced it at, and necessarily must be unbalanced everywhere else. Truth, and another one many do not grok > I...