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Since this forum is living advice I would bring up tractor. It is good investment. When figuring out what your going to do you might want to consider tractor. Wife and I bought 40 primitive acres. It is on a snow mobile trail above a lake and so on. Driveway is near 1500' of hardpack...

My wife and I just built off-grid home on a hilltop in New Hampshire. We had a large 12'x8' pad poured for wood stove. We surround stove with pavers to moderate heat. When stove cranked the pavers absorb most of the heat so we don't have to open windows. Pavers then re-radiate heat through...

Simple is a component of reliability. The more shit you got the more shit you got to go wrong. Keep it simple. If clunky is simple then keep it clunky.

Charge relay circuit uses digikey parts A122275-ND & 570-1393-ND

When wife and I started construction on off-grid home ( Bed & Breakfast ) I would collect sliding doors I would find at dump. I stopped collecting at 30 panes. I wasn't quite sure why I was saving them, but knew they would come on handy. (Wife thought I was nuts.) I decided to plaster them...

I will post .pdf of schematic when it is complete. I am creating symbols today.

It is a 48v inverter, so 120A should get me to near 5kW considering efficiency. We have well pump that takes near 8kW for 20 cycles to get up. I was surprised it is go stubborn. It is about 6A FLA so 36A on start is not too wild of a number. I believe motor inrush current is in-phase, so VA...

Let me take a shot at it. I've been off grid for about 5 years now. Off grid except for the 1000gal LP tank that gets filled up once a year. I own tank so I pay about $1.50/gallon. I'm most likely running a deficit over what I would have paid had I had the 1500' of power lines strung up my...

Crowbar circuits are not so simple at times. I did one many years ago for an inverter which ran a spindle on a machine tool. The circuit was included in a braking package. The idea of a brake is to just look at the DC bus of the inverter. When it goes over about 800v then a transistor turns...

My concern is BMS shutting power down to inverter and then coming back up. I am not sure if BMS is rugged enough to take a 2000A surge on mosfets to bring dc bus up. Also there is the question of what the class T fuses can take for inrush. This circuit would take care of both potential problems.

If you are in the military then current flows in a particular direction. Once you get out it changes direction.

I worked on design team for this inverter when I was a very young engineer back in 1980. We built over 300/day of these little units.

I would buy a battery that would pass an electrical inspection. That would be my most critical must have. The last thing I would do is DIY a home brew battery pack. I know that the Tesla Power Walls are being installed in many residential systems. Others I can not say. I would most likely...

The appliances may be key to this discussion. Ranges, microwaves, toasters, coffee pots, griddles and similar can blow a hole in your budget. A 1500w inverter will only operate one of those at a time.

What kind of a BMS was it that you smoked? There has been a lot of chatter recently concerning BMS capability as far as surviving direct short circuits and powering into a large cap bank. My feeling is that a BMS should be able to handle any type of short or power up into any size cap bank...

maybe better to run them up and down a few cycles before you add balancer.

Pull some current out of the pack 1/2C? 1C? and measure the voltage drop across each cell if possible. I think I am about 200uOhms per one 280Ah Eve cell. As a first approximation scale your ESR to (200uOhmsx2.8). How does that compare to the data sheet? to what you calculated with...

Is Omicron an anagram for Moronic?

The average commute to work is about 26minutes each way. I suppose that is near 50 miles/day The average mileage put on a car is near 14000. Assume 12000 is used for back and forth commute then that is near 250 miles/week or 50mi/day. I am talking average, not what any one person might do...

I would consider a charger with PFC if running on small generator. Meanwell has some nice looking units. I cannot give recommendation, but plan on using one when my new cells arrive.

I don't think I would use this one post to make a decision on which inverter to purchase. I have 48v system also. My growatt 6kW inverter arrived today. I intend to use Growatt only for inverter. I have other solar charger and PFC charger for generator. The manual is lacking, but sounds...

Me neither. I worked with the Finns at ABB. An impressive bunch of engineers

There is an incredible amount of peak power in just 1 280AH cell. Theoretically there is 28kW available in just one cell. A string is very dangerous. These cells are used on the NAVY 275kW laser because of the peak energy available.

Yes. They are all over the place. I have done a few simulations. The largest contributor would be the battery chemistry. A large LiFePO4 call array would have a small impedance leading to large current pulses. Likewise a large inverter with lots of capacitance will pull a nice pulse...

Here is board. If anyone is interested in a board then get with me. I am not quite sure of price until I know of anyone else wants one. I have a circuit description I will post a little bit later. I have errands to run for now. If anyone want to spend an hour or so to critique then I will...