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I appreciate the work mods do. Thank you to all of them. :) They have a tough job, and without them forums like this would quickly degrade into flame wars, arguments, fighting. That is not useful, not fun to read, or participate in. Forums have ALWAYS had rules and moderators, even before the...

Sorry about the mishap. The drawing for the voltage converter doesn't have a fuse in it. It really needs one. In your picture it looks like you tried to use a circuit breaker, and (if I am seeing it right) it is all wrong. For some odd reason, the converter seems to use black as positive and...

For up to at least 10AWG, and sometimes 8, you don't need a hydraulic crimper. A good ratcheting will work fine. You need to use the right sized terminal for the wire, and the right die for the terminal. There are different dies for terminals with shrink and and non-shrink terminals, and for...

The only thing in his post to suggest bad cells is that he purchased from an untrustworthy source. Nothing in his experience with them suggests a problem. That is important, because if the OP now goes out an buys the most expensive grade A cells from a reputable source, he will have the same...

Most of those links seem to be referencing pouch cells, or very thin prismatic cells that are almost like sheets. Isn't the point of compression to prevent movement of the internal components? No other purpose makes any sense. We are not applying enough compression to distort the aluminum case...

Get rid of the alligator clips. Alligator clips to a bolt are going to provide a very poor connection and will cause voltage drop while under load. Replace the alligator clips with ring connectors, and properly torque them to the terminals. The connection needs to be directly to the terminal...

I don't think ANYONE suggests that a DCDC is *required* or the ONLY solution. A DCDC charger is a great option if you have a stock internally regulated alternator, and want to do a budget install with an inexpensive drop-in. If you are building a larger bank, with larger alternators, then pretty...

What you describe is EXACTLY what GOOD cells do if you don't top balance them before building a battery pack. So, until you do that, you have not shown the cells are bad. No where in your post do you describe performing a top balance. Paralleling the batteries at ~3.35 volts will do nothing to...

Any newer tablet charges via the PD or QC charging standard. These standards use a USB connector but there is a 2 way data communication between the tablet and charger, and they negotiate a voltage up to 48 volts(not that high for a tablet, but the standard supports it). This allows higher...

While I have not used the EG4, I work in these equipment racks daily. I'm not clear on the issue from looking at the pictures. Do you mean that the holes will line up on one side, but not the other? Or that they will line up on the bottom 2 holes, and not the top 2 holes? Many of the cheaper...

Ugg. Don't bother with the Bank Manager or similar hybrid systems. They are nonsense; a solution looking for a problem. On a high level, one approach is to connect all your charge sources to one battery, then use a DCDC to charge the other. So, you could connect both alternators and the solar...

I think the misconception that PG&E is (somewhat successfully) selling is that they are offering incentives, that they now just don't feel they should continue. Being able to sell power back to PG&E at the rate you pay or anywhere below is not an incentive. It would only be an incentive if you...

It's great that batteries are becoming cheaper, but the power system of the future shouldn't depend on every home having batteries. If most homes had solar, the grid would be extremely fault tolerant, and if one home briefly exceeded its generation capacity, solar from nearby homes would supply...

We have many control groups. We can look at those in the US that chose not to get vaccinated. We can look at other countries with lower vaccination rates. We can look at history to see what rates of ill effects were before covid vaccines. All of these will need to have corrections applied...

There are two ways an alternator can be damaged by Lithium. Both are well known and documented by technicians that work on Lithium systems on boats, which seem to more commonly convert to Lithium. Depending on the specifics of your installation, they may or not be any problem at all. The...

A connection fee is actually perfectly fair. After all, they are providing a service, even if your net usage is zero or negative. What is NOT fair, is both having a connection fee, and not paying a fair price for the power you sell them.

This explains the goal. As long as you understand that you can not use OCV for pretty much anything other than making a nice graph on a computer or piece of paper. It can not be used for tracking SOC. A rebound of a few mV could be a huge error in estimated SOC. But for making a nice graph for...

Why not put the second controller on your house bank, and use the DCDC charger to keep the starting battery full. Solar controllers do not need to communicate to do this. Having 2 solar controllers would be no different than one solar controller and a DCDC charger.

The fully charged _resting_ voltage of LFP is 3.4v per cell. Yes, you charge to 3.65, but after resting a while they come back down to 3.4v Anything over 3.4v will eventually overcharge them if left. So absolutely do not float higher than 3.4v. Technically, LFP should not have any float stage...

You need to disconnect the ground from your DC negative, and have that ground connection go through the GFDI device. If you leave it connected, you are effectively bypassing the device by providing a path to ground that doesn't go through it. If you do that, it won't operate properly. This is...

3.4V per cell will achieve a full charge, it will just do it slower than 3.65V, and might require an absorb stage (holding 3.4V for a while before switching to the lower float voltage.) So if you want to not achieve a full charge, you should set the bulk voltage slightly below 3.4V per cell...

2 Battleborn batteries should be able to handle 1700W easily.

Beg to differ. A fully charged (resting voltage) LFP is 3.4V. Key word, is resting. You charge to 3.65V, and it is fully charged, but you let it rest, and the voltage will settle to 3.4V. It is still fully charged, even at that lower voltage. If you charge to 3.4V and immediately stop charging...

Yes, i understand exactly. I've done it, and it works fine, even with solar controllers that don't communicate. Make sure then controllers are set up the same, and they will not cancel each other out. It is quite common to have multiple mppt controllers, even mixing brands. As far as what each...

And only 30 miles. FWIW, for the price of that motor, you can buy an entire brand new electric boat with a range of 30 miles. They duffy electric boat has been manufactured since the 70's and accomplishes that.

Some clarification. Most single port BMS's still offer the ability to selectively stop either charge or discharge. Only one wire, but still 2 sets of FET's. The really cheap ones won't do this, so check the specs before you buy.

To top balance, you need to get all the batteries at exactly (or as close as practicable ) to the same voltage, at the top of the voltage curve. Anywhere after the curve gets steep is fine, so there is little advantage to top balance over 3.55v per cell or so, although 3.65v is the standard...

You are making some fundamental errors about how charging takes place. A battery is fully charged when it can not safely hold any more energy, not at a specific voltage. The resting voltage of fully charged LFP is ~3.4Vpc. Any voltage over that will result in current flowing into the cell...

I don't know what "before" or "after" means, but option 1 is best. Current will be the same anywhere in the circuit, so the shunt will work fine in either location.