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The existing AC chrged could be fed after the rectification with 240 VDC from the PV, there would need to be some form of regulation to avoid over voltage conditions. Working with oddball equipment can be challenging due to lack of off the shelf components, there is always a solution with...

The UPS would have a charger, assuming maximum charging voltage is 230.4V (14.4 per 12V nominal ) that would be slightly high for 60 cells, 67 cells using 230.4V would charge to a maximum 3.44 volts per cell.

Use 60 LFP cells of desired capacity in series with a 60S BMS ?

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...

NIFE are extremely robust, long lasting at the expense of being inefficient, compared to other chemistries, including LA, they can be refreshed with anelectrolyte change and last for decades. There is equipment which can be programmed to accommodate their requirements, see above, they never...

There is equipment that can work with NIFE battery banks, they have custom settings which allow for the large voltage swings, they do however tend to be more costly, furthermore there are inverters which can interact with the grid programmable to incorporate various functions including AC...

Automotive alternators are designed to recharge a healthy lead acid battery briefly after starting along with being able to support the lighting, ventilation and other loads applicable to the vehicles operation. Whilst it is possible to charge auxillary batteries it will reduce the alternators...

Overcurrent protection is specifically sized to protect the conductors, not the devices connected, therefore use the appropriate fuse as specified on the modules, it's to protect the attached conductors. Any overcurrent should be sized to protect the minimum gauge utilized within a given...

As it appears there is a generator available, my suggestion would be to measure the kWh requirements with a recording device to establish a baseline of the energy required for the intended usage. Attempting to guesstimate using specifications is difficult due to unknown duty cycles of the...

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.

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.

The SCC takes it power from the battery, personally I use a disconnect to isolate so a spark, if any, would not be seen. What are you referring to, a small spark or large, a SCC is considered an extremely light load but a load none the less, so a small spark may be possible.

Did you by any chance have an inverter connected? Even turned off the capacitors will cause a spark on initial connection.

My first build was a 4P 8S pack with 100Ah cells , it's been in service for 3 years without any problems, the cell blocks remain in ballance even when fully charged, which is not done on a regular basis, normally a lower value is used, ~90%, initially top ballanced. Whilst I understand the...

The answer depends on the controller being used, with PWM 12V nominal panels would be required, MPPT on the other hand needs higher voltage so 24V nominal panels would be used.

The association with cell failure in lead acid is not something to be over concerned with when using LiFePo4, as the cells do not fluctuate in voltage, as is the case with lead acid , where a single cells failure can be masked by the ballance of cells working harder. When using a BMS, any...

There are many types of PWM controllers, from simple cheap versions to more professional and everything in between. The cheap ones have a target voltage, usually 2.4V per cell or 14.4V for 12V nominal, when that value is reached it resorts to push width modulation (PWM), a switching off and on...

MOSFETs typically have around a voltage drop of ~0.6V, being they are semiconductors, not conductors, hense the cooling fan, the higher the current the greater the losses, in the case of a 100A load at 0.44V.drop, the loss would be 44W, or 3.35%. At lower current the losses would naturally be...

The current is shared equally in a parrallel circuit, therefore the fuse would need to be connected to both positive wires however it would be better to fuse each with an appropriately rated fuse.

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

There needs to be a load calculation done, the best way would be to use an alternate source, grid or generator, using a power monitoring device like a Kill a Watt in real use over the time required. Doing an estimate using the rated wattage is inaccurate because there are too many variables...

Having 5 12V 100Ah batteries would suggest a 12V nominal system, if the split uses 6.5A @ 230V the current on the DC side would be approximately 130A, but inrush during initial start will be double or more, which will cause significantl voltage drops, hense the low power fault. Without going...

Outback 2012 MT will do the job but will liberate you of ~$2000

Using a secondary deep cycle battery dedicated for the inverter is by far the better way to go, almost 80% of vehicular breakdowns are electrically related, 80% of the electrical problems are chassis negative bonding related, having a potential 100A draw seeking the party of lowest resistance...

Personally I would never use the chassis as the negative and secondly I wouldn't use the starting battery to feed an inverter for anything other than short duration use as the battery nor the chassis intended or designed for the purpose.

Some controllers allow battery to battery charging, Morningstar TS MPPT is one example, as it can be programmed to limit current flow. Batteries have high current potential which would likely cause the controller to run at maximum capacity continuously ifthe battery being charged is deeply...

Ignorance is not stupidity, stupidity is doing the same thing repetitively expecting different results, we all learn from others experiences, failures along with success, I'm not intentionally being confrontational, just pointing out the difference between the two.

Having a single SCC rated to handle all the charging is the best approach but also more expensive, having 2 charging sources is possible if the settings of both chargers of are identical, not always possible though, if not customizable. This is why many serious operators generally stay away...

The inverters ability to support loads directly from PV is limited to its on board MPPT's capacity, in your situation around 900W, any more is taken from the battery, the problem is the battery will never get charged if output exceeds input. Having a separate higher capacity SCC also...

To get around the problem I would remove one array string and use a separate charge controller set to the same parameters as the inverter MPPT, or use a separate SCC with a higher capacity as the sole controller. The thing to remember is any loads will subtract from the charging current, if...

Looking at the specs the Plus version has a 60A MPPT charger, the regular is 40A, if this is correct then the nominal output would be 960W, this would be consistent with your observations, the MPPT charger would be over paneled but cannot exceed it's maximum capacity. This is benificial during...

Unfortunately without being able to gain insight with the devices needed, it's extremely difficult to diagnose the potential problems, it's approaching the system blind, it is unfortunate that there is no direct visual interface, To add insult to injury, the product is at it's end of support...

At 26.8V a lead acid battery is close to being fully charged, hense the reduced current, or wattage, discharge the battery to a lower voltage and see what happens, more than likely it will increase, but this isn't necessarily the case if the conductors are sized on the smaller end of the...

Even high voltage transmission lines, 500 000V use regular transposition points to cancel out magnetically induced interference, both in AC and DC, if the inverter is actually taking intermittent bites out of the battery there would be a rising and collapsing magnetic field, because the...

Twisting the cables can reduce noise or ripple by cancelling superimposed signals, this is used in telephony to reduce cross talk as well a anti side ton induction coils for filtering, at least that is what was done before cellular phones, it is also used in computer cables. Google ripple and...