Hello. I once had a Victron 100v 30a MPPT before, I believe, and it worked very well with my solar array. However, I returned it when I got myself more solar panels. I am thinking about getting a Victron 250/60amp model, they are very expensive, but Victron MPPTs, based on my experience, work just the best.
I live in Lithuania, and I have 8 solar panels in total, but with the 250/60 Victron MPPT, I would only be able to connect 5 of them. I am not planning of getting a Multiplus for now, but would like to hear your honest option.
To provide a better understanding, I have 2x 12v200ah lifepo4 batteries (recommended charging amps is 40), that I have wired in series. And so, my question is; would I be able to sustain running a 1000watt heater while using the MPPT controller (during the day), or should I look for something bigger?
The solar panels I use, each, has specifications of:
Opt. Operating Voltage (Vmp) 32.4 V
Opt. Operating Current (Imp) 13.59 A
Open Circuit Voltage (Voc) 39.4 V
Short Circuit Current (Isc) 14.01 A
Module Eciency 22.5%
(IP68, 3 bypass diodes)
Hey, I did check the calculator, the MPPT would only run 5 solar panels in series, when taking into account the panel temperature coefficient during winter months (voltage tends to increase). Yes, I can exceed the 40amp recommendation. Since that is the case, do you think powering a 1000watt heater would become a possibility? Thanks, Mr. Ludo!
Thank you for all the answers. I heard people say they have multiple 150 MPPTs connected in parallel, and they charge the batteries with those, but I rather get myself a one MPPT that works well on its own. Should I consider the Victron 250/80 MPPT unit instead? Thanks in advance.
If the Batteries are 200Ah, you should be able to charge at 100A.
It is always possible to connect more solar modules to an MPPT than the output current rating suggests, as long as you don’t exceed the max input current. This allows you to get full current on reduced sunlight.
Hey, thanks for sharing this idea. It is true that the 250v version costs a lot, I just have no idea as to how I would have to wire the 4 (100v30a) MPPTs together in order to charge my two 12v 200ah lifepo4s which are connected in series. I assume I would have to split the batteries apart, and use two mppt controllers for charging one 12v battery? Thanks in advance.
Oh sure, main thing is that you have something to keep track of your state of charge.
With the victron smartshunt you could setup a Bluetooth network to supply the chargers with the “real” battery voltage independent of wiring-drops and synchronize the charging states
NO. There is a max voltage wich must not be exceeded, or the MPPT will clamp the input. This clamp has a current limit: This is the MAX INPUT current specified for the mppt. So the sum of the string currents (Isc) connected to the MPPT must be less than this. (As well as keeping under the max input voltage.
