Small boost mppt charge controller

[ET92]

Soon I will have two photovoltaic panels left over, and I wanted to place them on the roof of a wooden tool shed, with the two pitches oriented oppositely (so not in series).

I'm looking for two battery chargers with mppt that can charge the 48 V LiFePO4 battery from the 37 V of the panel (they are 500 W panels). So I need boost converter.

I dont find anything good and reliable. The least worse is this.

ECO-WORTHY 24V/36V/48V/60V/72V Boost 12A MPPT Solar Charge Controller Regulator

Do you know any reliable models?

 

[DougfromdaUP]

The genasun line is very robust, but they are pricey, and you can’t diddle the absorb voltage.

 

[Suijkerbuijk]

So like to boost the solar panel 36 volts out put to a 48 volts mppt .
Forget it this is not how a mppt works.
A mppt need 6 volts over it battery volts .

You can use a boost converter.
That can make from a low volts to a higher volts .

Input 36V to 46V Archives - DC-DC Converters, Step-Up Voltage Regulators, Buck-Boost

elecdan-converter.com

Like this one.

Own risk

 

[BatteryBuff]

Soon I will have two photovoltaic panels left over, and I wanted to place them on the roof of a wooden tool shed, with the two pitches oriented oppositely (so not in series).

I'm looking for two battery chargers with mppt that can charge the 48 V LiFePO4 battery from the 37 V of the panel (they are 500 W panels). So I need boost converter.

I dont find anything good and reliable. The least worse is this.

ECO-WORTHY 24V/36V/48V/60V/72V Boost 12A MPPT Solar Charge Controller Regulator

Do you know any reliable models?

If you are interested in Renogy products, here is an option which will output 48V at 12A which will handle your 500W panel. https://www.eco-worthy.com/products/48v-60v-72v-boost-12a-mppt-solar-charge-controller-regulator

 

[ET92]

Thanks for the advice!
I looked at the Genasun and yes, they would be great but their power does not follow the power of the new 500 and 600 W panels (they were probably designed for other purposes, such as golf carts etc...) and they are too expensive! They cost more than double the panel!

@Suijkerbuijk The step-ups you sent me are interesting. I read the specifications but they are not complete / do not explain how they work... Does the step-up maintain a fixed 36 V input and absorb everything it can? If so, it is not very good because if my panel has a maximum efficiency voltage of 38 V I already lose something from the start. Not to mention that if I have a shaded strip that should make the MPPT switch to a lower voltage, here I would lose power in the entire panel. I don't like it.

@BatteryBuff yes, the one in your link is the same one I had seen, I didn't know it was from Renogy. But it doesn't seem very reliable... So far, however, it is the cheapest and most functional solution...

 

[Suijkerbuijk]

Thanks for the advice!
I looked at the Genasun and yes, they would be great but their power does not follow the power of the new 500 and 600 W panels (they were probably designed for other purposes, such as golf carts etc...) and they are too expensive! They cost more than double the panel!

@Suijkerbuijk The step-ups you sent me are interesting. I read the specifications but they are not complete / do not explain how they work... Does the step-up maintain a fixed 36 V input and absorb everything it can? If so, it is not very good because if my panel has a maximum efficiency voltage of 38 V I already lose something from the start. Not to mention that if I have a shaded strip that should make the MPPT switch to a lower voltage, here I would lose power in the entire panel. I don't like it.

@BatteryBuff yes, the one in your link is the same one I had seen, I didn't know it was from Renogy. But it doesn't seem very reliable... So far, however, it is the cheapest and most functional solution...

The best thing .
Just set those panels in serie .
Looks for some extra models for the other side.

The rest of the option are just a fix up .

 

[ET92]

Yes, I thought too... I put the panels in series and let the inverter choose the best power point among the various local maximums. The problem is that having few panels in series (I think 6 modules) and only 1 or 2 have sun, with the high current of this two module I don't have enough voltage to overcome the minimum of the inverter, which will therefore be forced to choose a lower power peak but at higher voltage. Mmmm...

Otherwise.. I'm looking at this

https://it.aliexpress.com/item/1005005572132613.html