Recent content by BentleyJ

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.