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If its going to be a system for your home and you want maximum flexibility go with a 48V system, much broader selection of equipment available.

Its because each stage uses refrigerants with different boiling points. The first stage and second stage could be linked via an insulated heat exchanger such that outdoor ambient temp would not be a significant factor.

So the Inverter Load would be connected to the main service panel simultaneously with the grid?? Or perhaps the plan is to turn off the grid and use the SA 15K during the day with solar panels only and no batteries?? Both are extremely poor ideas. The inverter can feed utility power through...

For reference, see attached float charge cycle from yesterday. This is a good representation of a proper 2 hr & 45 min top-up float. Note how sharp the current tails off when well balanced cells all reach full charge simultaneously at constant voltage. Its a small battery, only 270Ah and the...

The discharge curves starting at about 1 pm look normal. Voltage slowly falls, and responds to current changes, until the batteries are depleted and voltage falls off a cliff. This is normal behavior for LFP chemistry, both during charge and discharge cycles. The SoC values being calculated by...

Found this on YouTube regarding multi-cascading heat pump technology for extended temperature range operation.

Float should be a little lower, 54.4 to 54.8V. In full sun with low loads the battery doesn't need that much maintenance voltage.

Regarding question 2: The installation manual will specify how many microinverters of that specific model number are allowed on a single branch circuit of X amps. There is no circumventing wire gauge. EDIT: If its a large array requiring multiple microinverter strings then a combiner box will...

Microinverters do not store energy they produce AC and send it out, either to the grid or batteries or both. For example Enphase makes a proprietary battery system that works with their microinverters. However, microinverters can be AC Coupled to a hybrid inverter that supports AC coupling...

Yes, but in parallel, if the minimum MPPT start up voltage is not reached there will be 0 output.

One of the properties of LFP chemistry is its very flat voltage vs. SoC curve between 10% and 90% SoC. So the smaller capacity will not prevent the new battery from contributing its share of the 51.2V nominal series string. But as stated earlier, the system will be limited to about 90Ah which...

It depends if the batteries you are comparing are the same chemistry, LiFePO4 vs. Li-ion. With LFP batteries they vary by manufacturer being either 15 or 16 cells.

As to the other question, "Solar Wizard" and other various titles are something that are assigned by the forum administrators just for fun. Most of us don't pay much attention. If you are looking for a response from someone in particular best to use @ForumMemberName or a Private Message.

As long as the 12V battery (specifically the BMS) chosen is compatible with the 48+Volts when connected in Series you can use another brand. Refer to the specification sheet, it should say if series connections are allowed. In fact, you could even use a 12V battery with a different capacity...

If you have Li type batteries of any kind, an internal BMS that monitors individual cell voltages as well as battery current and temperature is not optional, its a necessity not only for proper performance and longevity but more importantly safety.

The lower voltage charger will not damage the batteries but they will never fully charge and the BMS cannot balance cells properly. 14.2V is fine also.

Each battery is 100Ah I believe? They can be safely charged at up 20 Amps. Yes, you need to wait for the new charger and get all 4 batteries up to a minimum of 13.7V and hold for several hours. 14.0V would be better.

Good chance that a top balance at 14V for several hours will correct the problem, until the batteries get out of balance again. If there is not a Bluetooth connection available with the BMS then there is no way to view individual cell voltages without opening up the battery case. Best you can...

Its likely that the battery with the low voltage is shutting down due to the BMS sensing a low cell. Since its a single series string if one BMS disconnects then the inverter sees an open circuit. Would recommend charging all 4 x12V batteries to the same voltage when connected in parallel to...

I've had good results using a 12V, 2000W AIMS with a mini fridge that draws about 75W while running.

Sounds like the inverter is an older version that no longer has documentation online. For example Schneider publishes the max usable current on the MPPT input and also lists a spec for the max short circuit current of the PV array. With this information one can calculate how much over paneling...

Before deciding on any equipment it is essential to identify your seasonal kWh electricity usage on a daily & monthly basis. Its also important to understand Peak kW loads if operating motorized appliances like Air Conditioning or pool pumps or well pumps Etc. Its a good idea to also look at...

Assuming its not the new 500V version. The online datasheet for the older LV 6548 version allows up to 390V OC with the MPPT range up to 350V. Max usable current is listed as18A per input but you can over panel a bit. Any available amperage in excess of 18 will be ignored. Do you have the...

Since you mentioned whole house back up, Sol-Ark 15K can do 200A pass thru and could AC couple with the 9kW Enphase system. Depending on the age and model number of the Enphase microinverters its likely a firmware upgrade is necessary so they behave well with the grid forming inverter. This is...

What is your absorption voltage set at for the charge cycle? Unless all the batteries reach at least 54.8V AND the charge current has tapered off to less than 2 Amps, they are not fully charged. The BMS needs to recalibrate to 100% on a regular basis. If the batteries are constantly micro-cycled...

You are on the right path. Most all hybrid All-in-One units have the capability of using CT's on the AC input wiring to limit export to 0 or very near 0. Since you already have a net metering agreement they will not be able to detect a small amount of extra sell back, at least not during the...

"Conventional" systems don't necessarily meet everyone's needs. Isn't it great when your crazy idea turns out to work perfectly. When our Solar City Lease expires in 6 years, I'll be installing arrays East, South & West facing. Was just thinking the other day about how a couple of plumbing...

Yes, there is supposed to be a potential difference between the PV panel output wiring and ground, PV's are a source of power! Neither PV+ or PV- is supposed to be grounded. Only the PV panel frames and racking are to be grounded. Therefore when the switch is ON it simply means the PV's are...

JK BMS is limited to 2A of balancing current and since it doesn't simultaneously draw from the high cells and transfer to the low cells, its only operating at a 50% duty cycle. Realistically you would need 4 high current balancers, like in the 10 to 15A range to balance the fully assembled...

41V x 8 panels in series = 328V Well below the max voltage limit. Yes Each Input is rated for 17A usable current for a total of 34A. 8,000W/34A = 235V so if the current was maxed out the PV arrays would only need to be at 235V to produce the 8,000W. On the other hand, 8,000W/450V = 17.7A. If...

I wouldn't say TED is total junk but it did have some issues initially with Power Line Communication until filters were added. Accuracy was acceptable but not great. Worked well for several years. What I liked about TED was the user interface, in particular the gauges. Will add...

Split Phase Inverter generators suffer from the same limitation as the High Frequency Inverters discussed often on the forum, their sensitivity to off balance loads across L1 & L2. I'm using the smaller Champion 5,000W open frame inverter gen as a back up on AC2 of the Schneider. I've also...

Many of us use Emporia Vue. Low price vs. features is probably the best value. Some on the forum don't like the fact it is cloud based and doesn't keep 1 second data long enough. This is what I use with 10 CT's. Accuracy is good. IoTaWatt is highly recommended also, costs more but affords more...

Dryer is a 240V load so is balanced across both Hot legs. The other appliances mentioned are all 120V and were most likely all on the same leg. Is it possible to move one of the breakers to the other bus bar in your panel. Either the microwave or the space heater circuit.

If the multimeter has 10A DC setting, current can be measured directly by putting the meter in series with one of the inverter battery cables. Certainly shouldn't be more than 10A draw. Worst case, a $15 fuse in the meter gets wasted. Ask me how I know what they cost!