24 volt

[alexv707]

Need help figuring out what solar components I need to create my system, The rv is 24 volts and I already have a magnum energy 24 volt 4000 watt inverter, shunt, lithium batteries, auto transfer switch for generator and shore power. I have room for 4 panels. not sure I need 4 or can use 2 200 watt panels. Do I need 24 volt panels or can I use 12 volt panels wired in series? Also what is a descent 24 volt charge controller

 

[mikefitz]

not sure I need 4 or can use 2 200 watt panels. Do I need 24 volt panels or can I use 12 volt panels wired in series? Also what is a descent 24 volt charge controller

You can use any setup of panels provided the total voltage is higher than 34 volts and less than the controller voltage limit. 400 watts of panels need a 30 amp rated controller, sugest the Victron 100 30

https://www.amazon.com/SmartSolar-MPPT-100-Charge-Controller/dp/B073ZJ3L13/ref=sr_1_3?crid=3MQT1RJDIKKJL&keywords=Victron%2B100%2B30&qid=1707561175&sprefix=victron%2B100%2B3%2Caps%2C478&sr=8-3&th=1

24 volt panel specification , Vmax power, 37.6, Voc 45.4,,

MEGA 200 Watt Monocrystalline Solar Panel | Best 24V Panel for RVs and

The RICH SOLAR Mega 200 Watt 24 Volt Solar Pane is a key component to any solar power (PV) system. Feautures a 9 buss bar solar cell configuration and mono PERC Technology. Each solar panel includes standard solar connectors that extend from the junction box affixed to the back of each panel.

richsolar.com

Thus two in parallel would be suitable.

12v panel specification Vmax power 18.6, Voc 22.8

MEGA 100 Watt Monocrystalline Solar Panel | Best 12V Panel for VAN RVs

The Mega 100 Watt Solar Panel features a 12V off-grid solar panel with 0~+5W guaranteed positive power output. It is an IP 65 or IP 67 rated built with strong tempered glass and aluminum frame. Certified to withstand challenging environmental conditions.

richsolar.com

Connect 2 in series and then connect in parallel with the remaining two in series.

With the 100 volt limit on the controler, a totally series set up would not leave enough margin between total panel voltage and controller limit.
The panel examples used were random selection . There are lots of options including 400 watt and over, solar panels. The more solar the better so carefully consider available space and available panel sizes , for example replacing the 200 watt panels with 250 watt if space permits.
Mike
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