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Getting a headache reading this, I'm less than 100Km. from the OP with 2 systems in the same conditions except my banks are not climate controlled, temperature is not a major concern, the cell temperatures are generally 10°C below maximum, unless >40°C persists for a number of weeks, which is...

Today was the annual ballance check of my LiFePo4 bank, where I program the SCC to 28.8V, from the normal 27.4V on an 8S 4P bank, to see how the ballancing is from the initial top ballancing. The maximum delta voltage between cells was 83 mV initially dropping to ~35 mV after an hour, not...

Because a refrigerator is an almost an essential appliance, along with being one of the most energy consuming, understanding it's demands is essential for offgrid planning. Many who are new to solar underestimate it's needs resulting in dissapointment, to better understand it's demand I...

When dealing with any lithium battery bank one has to think voltage at a cellular level, not at the overall bank voltage, yes theroitically the two unequal capacity banks in parallel will discharge at equal overall bank values but not necessarily equal cell voltage. Without individual cell...

Not specific to the Epever Following the proper connection/disconnection procedure is important for the following reasons. The battery is what the controller uses for power, it's voltage is used to establish the nominal voltage in auto voltage select types, manual programmed types are self...

The charging voltage should be what the manufacturer recomends for a given application, in photovoltaic systems it's undesirable to turn off the charging source because it will then prevent loads from using the PV, resulting in drawing from the battery, until a subsequent charge cycle is...

This thread is interesting despite my not having EVE cells, primarily because it raises questions which I have come across during my research phase. The first involved the useage of higher capacity cells as opposed to lower in a parrallel configuration, the recommendation was that the preference...

Finding the hardware is frustrating and time consuming in Thailand, there is no one stop shopping, everything is available but just not easy to locate and the language barrier only makes it worse, May I ask, previously you mentioned having two banks, a 280Ah and a 150Ah in parallel connected...

@Jgoodman Mixing the panels to feeda single MPPT controller is not possible due to the significant difference in output. Five batteries cannot be configured for 24V, consider yourself lucky, as doing what you did is potentially dangerous. You may want to disconnect everything for now and...

To correct the statement regarding poor power factor consuming more battery power. Poor power factor will only have an effect on the generating source, the inverter in this case,, not the battery, a load of 1000W at a power factor of 0.5 will still consume 1000W from the battery this is refered...

As a foreman supervising a crew of electricians, there was one electrican who always produced sloppy work, whenever I confronted him regarding the quality of his craftsmanship, his answer was "is it electrically safe?" My answer was perhaps, but rip it all out and start again, because it...

Don't use a modified sine wave, the compressor motor will overheat likely causing premature failure.

Recycling depots are where to dispose lead acid batteries, even in Thailand I received Thb 8500 for a bank that cost Thb 38 000, over 20% of the initial cost is scrap value.

The diagram is a simple ladder diagram not an electronic schematic, sorry for the confusion, the parrallel vertical lines are normally open contacts, labeled with the relay or contactor they're associated with, circles with a letter and number represent coils, R for relay, C for contactor...

My experience with a vendor in China was entirely different, I ordered 32 cells, no name brand bytes were cheap $55 for 100Ah, two had twarning labels that had lost their silver background, after alerting him to the fact, he responded within 15 minutes stating don't use them and that he would...

As an electrican trained under British standards, perhaps I can shed some light on the subject. During the inspection all circuits were tested for impedance and insulation dielectric strength, this was to ensure everything was safe, basically it was a verification of sorts before the electrican...

My experience with NIFE is extensive in railway signaling applications, some had been in service for over 30 years with electrolyte replacement every 3 years, despite that they wouldn't be my first choice, they are too inefficient in my opinion. Current technology such as LiFePo4 is far...

Simplicity has a quality all of it own, keeping the amount of contact points down to a minimum reduces the potential of something going wrong, particularly with active wiring carrying current. Food for thought, in the last 5 years my pickup has lost an injector, turn signal, wiper motor fuel...

The thing that stands out to me as being potential weakness the lack of triangulation , a simple ladder design without cross bracing would transfer load into the panel frames making them a structural member, which they are not designed to be. There also needs to be a bracing pole at around 45°...

Without knowing the battery details it's impossible for anyone to provide anything other than speculation, details are important, the more the better.

I'm in agreement with the theroy you've provided, this would be the case in normal conditions, however if a single cell fell below a fully discharged value, the load was disconnected then the larger bank cascaded into the smaller bank, minus the failed cell, I'm unsure what the reaction would...

For the record I do live in Thailand, I am rural, do not have grid power, facing the same challenges that you encounter when looking for hardware, but manage to overcome them. There were so many critical mistakes made that it's not supprising you've had multiple failures and most likely will...

Measure the voltage drop across the cables of each battery independently with a fixed load, that will determine if the cables are within close proximity to one another, measuring resistance without load is not dynamic, current draw will reveal any high resistance terminations.

With regards to mini split A/C units, it would appear efficiency comes at a cost. Case in point, I have two 9000 BTU inverter splits, a Diakin with a linear compressor, R32 refrigerant, SEER 28, installed cost ~$750. The other a Samsung rotary compressor, R 410A seer 18, installed cost ~$425...

Yes, I haven't been on NAWS forum in a while, seemed to become stagnated on lead acid with LFP being referred to as not suitable for DIY, here its the other way around and since I would never consider LA again this environment is more suitable.

There are a few other factors which may need to be considered, first is the time line of events, power goes off early in the morning before sunrise, then restores later after sunrise, hense charging has begun, then the fire occurs. Secondly the possibility of rodent damage to insulation is...

During the hot season here in Thailand, temperatures can reach 47°C during the day, the battery cell temperature will usually be 10°C lower due to overnight cooling, which represents the average temperature more or less. When the overnight temperature remains high for over a week the cells...

Not that I'm aware of, it wouldn't be a useful feature, but who knows

This is becoming stupid, enough said.