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If you read the Renogy instruction manual, always a good idea even if most are poorly written, it contradicts itself. The degree of over panel you are considering is not excessive and you will rarely, if ever, have solar conditions to produce the maximum from the panels. My interpretation of...

Many of the low cost flexible solar panels seem to fail within 2 to 4 years. With a lightweight trailer you dont really have other options so I suggest a quality panel ( Sunpower). You can get acceptable performance from a low cost PWM controller and with low voltage panels you dont gain a great...

In Australia the MEN protective system at the main switchboard connects the incoming neutral to a local earth electrode. Any sub board in the same building use an extension of the neutral and earth. However if there is an out building only the live and neutral is exported and a additional local...

Carry out some more research. You don't need both types of battery. Solar controllers for 96 volt batteries are available. Run the motors direct from a 96 volt lithium battery bank, use Winston Cells. Do you really need 50 HP motors, research actual need for your vessel and proposed...

10 AWG cable has a maximum current rating and it seems from the picture this is being used for cables to the solar panels and to the battery. At the maximum I expect that cable to be rated at 50 amps, typically around 30 to 40 amps. The over current protection, fuse or breaker, has to protect...

You are way over in your power estimation. Stay with a 12v system. Need a 1200 watt inverter, suggest Victron Phoenix Compact 12/1200. AC charger, Victron IC 65 compact. Engine charging, need a DC to DC charger, suggest Victron Orion 12 12 30. Battery minimum 100Ah lithium with a 100A BMS...

What if the inverter is in an aircraft? What if the inverter is in a boat? In such applications you cannot connect to earth rods.

Victron Orion XS, 50A https://www.victronenergy.com/dc-dc-converters/orion-xs-12-12-50a-dc-dc-battery-charger#manuals The big advantage over its smaller sibling , the Orion 30A, it has a VE direct port for complete integration into a Victron system. It's very probable these have partially...

The EB70 is good for USB charging and short time AC loading but has limited power storage and solar panel limitations due to the 28 volt 8 amp panel limit. My suggestion is to add a 12v 100Ah battery, lithium would be ideal but lead acid would be a medium term solution, and a solar...

No matter how poor the switch I cannot see a few 10s of volts and amps from a current limited source causing damage with intermittent connection to the input, ( this is assuming there was a battery connected to the output). There is an internal fuse and a forum member opened up the case and...

You are getting good advice on this forum and some poor advice from big battery. Some of the advice is incorrect. Boost charge isn't an elevated mode, boost is the charging voltage target , absorbtion voltage . These values are the ones you need. Boost volts is charging voltage, set to a...

Boost and absorbtion volts are the same thing, just odd terminology used by Renogy. Regard boost ( absorbtion) voltage as the 'target' charge voltage. When the charger wakes up in the morning it puts as much energy into the battery from the panels as it can, until the voltage on the battery...

I should have made the point with more words. If you have two current measuring devices in series in a circuit then any resistive volt drops within that circuit will not have any effect that will cause the readings to differ. Mike

It's not unusual with the AGM batteries readily available in the UK to experience short service life. Steve_S suggestion on decreased quality is correct. However its not confirmed your batteries are damaged or have reached the end of useful life. It's possible that the batteries have become...

Two 40 amp B2B will be OK running in parallel. Note with a 40 amp output, the input current current could approach 45 to 50 amps. The 220 amp alternator will have a lower output at low engine speed, also the vehicle electronics could use in the region of 50 to 60 amps under some conditions...

There is difference in a demonstration setup for media, compared to a real life safe installation. Each cable and whatever is attached to the end of it, has a maximum safe current and must have a protective fuse or breaker as near as possible to the power source, the battery. The fuse box for...

https://www.lithiumbatterypcb.com/product-instructionev-battery-pcb-boardev-battery-pcb-board/ev-battery-pcb-board/smart-bms-of-power-battery/ Fast delivery if you use the air freight option. Mike

Neat solution, I have used copper washers in the past. Although very unlikely, with a single fuse one battery could fail and current from the 'good' battery will flow into the 'bad' battery.

Check connections at cells for buss bar issues and BMS leads, confirm BMS measurements with voltmeter direct on cell terminals. If its been OK for months then it's unlikely that's its a serious balance issue, any serious inbalance would have shownup the first you charged the cells.

The B to B itself cannot produce enough energy to blow a fuse, unless it gets the energy from the other battery. This battery has a fuse so the current will be limited. Any solar power is current limited by the panels. Overcurrent protection is needed at the high energy power source. In the...

If you search out research papers on the topic you will find a memory effect can exist where the cells are short cycled. Taking the cell through a full charge cycle removes the effect, but required more energy than a normal charge cycle. This is one of many reports on the effect...

If you are building a 4 cell battery and the current output is less than 120 amps then the Overkill version with Bluetooth is a better alternative. Overkill is out of stock at the moment. Available from other suppliers, look for the statement that the Bluetooth dongle is supplied with the BMS. I...

For those in the colonies for 'rubbish' read trash or garbage .

Most 12v compressor fridges will automatically operate on a 24 volt supply. Mike

I would not worry about charge current too much at this stage. What you are seeing is slightly unbalanced cells, this is not unusual in ready built batteries . Once the cells reach 3.4 to 3.5 volts with a charger delivering a low charge current, they are mostly full, it will only take...

If its a MPPT controller then, yes, this is acceptable. The controller adjusts the power point on the panel characteristic to limit the current to the rated current output of the controller. The panel volts and current must be within the controllers specified input limits. Nothing is wasted as...

This is your problem. The protection values in the BMS need setting higher, not at the same values as the charger. The BMS protection values are just that, protection against abnormal conditions, they are not intended to control the charge process. Typically these will be, cell over volts 3.65...

This advice assumes you have a functional BMS with over voltage protection connected to the battery. It also assumes you are capable of making temporary connections to each cell and have suitable safety protection (eye protection, no metal finger rings , metal watch straps and such). If you...

For a RV with modest power requirements, inverter under 3000 watts, there is little advantage.

Having looked at the photo in the Renogy add it does seem that the panels are wired in series. This is from the add, The early post suggesting the panels were actually 'half' panels may be correct. With the normal panels of 32 cells they are arranged in groups of 16 with bypass diode...