need help sourcing correct components

[littleharbor]

If you do get this controller I'd be real curious to find out if it does, in fact, boost the incoming amperage . The VOC limit of 50 volts leaves me wondering being that most 72 cell (24 volt nominal) PV panels have a VOC of approx. 45 volts at 25 degrees Celsius. Add cold weather to the equation and you have magic smoke, not magic MPPT.

[NochiLife]

Regarding the cheap "MPPT" charger, I found a listing for the exact same "MPPT" on eBay. And they clearly state in the subtitle, "Simple MPPT, Not high-end, No Inductance"

https://www.ebay.com/itm/12-24V-30-5...B/142925657679

In the description:

Note：

This controller is the MPPT solar controller, which is the new manufacturer that has been tested in batches in recent months! ! !

The shape of the controller is the same as the previous PWM controller but the function is different. Please mind carefully.

It is suggested that the customer ask us for the product manual before placing the order to make sure whether it is the MPPT controller they need. If you are not satisfied with it, please do not buy it.

This product is a simple MPPT controller, the price is cheap, not high-end multifunctional MPPT controller, please think twice before purchase!

As pointed out, the other charge controller you found DOES have toroids ("inductors"); your mileage may vary.

Regarding the WZRELB inverter...some reviews on YouTube of their 8KW model indicate that it is a lot better than some other ones. Again, I have no experience with it.

[Mcmullen7242]

Thanks! And someone just posted this inverter near me for a good deal and just want to get your opinion before I go out tomorrow or the next day and pick everything up.

https://www.amazon.com/WZRELB-Power-...a-687980662501

and then 8 Sony panels I posted before, 4 of the agm batteries

[Mike90250]

Absolutely shut the inverter down if there are no loads. Some inverters have a "search" function, they go into deep sleep, low power mode, and wake enough every couple of seconds to see if a load (light switch, fridge thermostat) has appeared and then goes back to sleep.

[Mcmullen7242]

it's a 300w inverter with a 600w surge for 10 min rating. Not quite enough to start a fridge, but it will do a lot of other work.

Thanks but I'm definitely going to need at least 750 watt inverter, 1kw preferably. Because two Xbox ones and two TVs will be 400watts altogether plus 2 fans, and phone chargers. If I did the 2kw one can't I just turn it off at night when not in use and I won't waste any energy?

[Mike90250]

it's a 300w inverter with a 600w surge for 10 min rating. Not quite enough to start a fridge, but it will do a lot of other work.

[Mcmullen7242]

Efficient inverters require engineering and quality parts The Morningstar Suresine 300 is efficient and expensive. And reliable.

I'm pretty sure that is only a 300w inverter, but I'm looking into that brand thanks

[Mike90250]

Efficient inverters require engineering and quality parts The Morningstar Suresine 300 is efficient and expensive. And reliable.

[Mcmullen7242]

They are not proud of their electrical specs, since they don't publish self-consumption or efficiency, My guess would be 50W in idle, x 10 hours = 50whr, it won't drain the battery, but it's not insignificant.

Do you know of any efficient 1kw-1.5kw 24v pure sine wave inverters for under 350? But also can I just turn off the inverter during the night since my appliances are all propane?

[Mike90250]

They are not proud of their electrical specs, since they don't publish self-consumption or efficiency, My guess would be 50W in idle, x 10 hours = 50whr, it won't drain the battery, but it's not insignificant.

[Mcmullen7242]

Sorry about that but if i do not really use much energy when the suns down and I have 4 of those batteries would the inverter still drain them? Also within a month or two I will be upgrading the batteries closer to 10kw (getting rid of these and buying brand new 24v 200ah batteries) Most of my energy usage will be midday.

also could you post me a link to a charger that you would like so I can try to compare?

[sdold]

It's hard to tell for certain. It does seem to have the toroids and capacitors I'd expect, and the price is at about the bottom end of what you'd see for a small MPPT controller. The reviews aren't great though. By the way your previous post was cut off, try not using apostrophes. Copy it before you save it and if you see it truncated, remove the punctuation or character that caused it.

[Mcmullen7242]

Also is this a real MPPT?

https://www.amazon.com/Controller-Ba...255888697&th=1

[Mcmullen7242]

I think Mike is right, that controller seems too cheap to be a real MPPT controller, and the mention of the "negative MOSFET switch" is another clue that it's probably just PWM. Since PWM is just on/off switching, 5A x 8 panels is 40A, or 480W. Those panels really need an MPPT controller and/or a 24V battery to take advantage of the operating voltage. Inverters only take what they supply, plus a little more due to inefficiencies. The problem is a big inverter uses proportionally more power when idle, which can discharge a small battery quickly, and possibly pulling a dangerous amount of current from the battery with a large load or surge.

Ok thanks, but if I don

[sdold]

I think Mike is right, that controller seems too cheap to be a real MPPT controller, and the mention of the "negative MOSFET switch" is another clue that it's probably just PWM. Since PWM is just on/off switching, 5A x 8 panels is 40A, or 480W. Those panels really need an MPPT controller and/or a 24V battery to take advantage of the operating voltage. Inverters only take what they supply, plus a little more due to inefficiencies. The problem is a big inverter uses proportionally more power when idle, which can discharge a small battery quickly, and possibly pulling a dangerous amount of current from the battery with a large load or surge.