Question: what are the pros and cons for my settings if I use 1 x 4 panel in series
4 x 23.9V = 95.6V 95.6V / 10.74A
…or if I use 2 x 2 panel in series/parallel
2 x 23.9V = 47.8V, 2 x 10.74 = 21.48A 47.8V / 21.48A
I know that both needs different parameter MPPT controller
I know that in series I reach the 5V extra voltage earlier to start the MPPT
I know that the shading has bigger affect on panels that connected in series
I know that if the short circuit current of the array is greater than the ‘maximum series fuse rating’ listed on the panel’s sticker then MC4 fuses must be used on the + right before the cable splitter
In series you will need a 150V MPPT because you are close to 100V it will exceed this on a cold day and damage the controller. In 2x2 you will be able to use a 75V or 100V controller. For DIYers new to electrics, 100V DC is in the range where you need to be careful. Mine are 2x2 to keep operating voltage to 50-60V, another vote for this arrangement.
A bit of information on the topic and “entertainment”.
According to secret service information, recordings of the unknown vehicle were made a few hours ago in the Denmark cluster …
The reconnaissance was facilitated because, according to “still unconfirmed” information, the vehicle is supplied 24/7 by a heat generator of unknown origin.
Images of the (narrow) battery compartment can only be obtained from close range, as it is obviously protected by some kind of cloaking device.
For this reason, the secret service classifies this vehicle as an “escape, supply and rescue vehicle” of the “curtain class” (ESRV – CC).
The vehicle will be equipped with a 4th front panel for energy generation in the coming weeks. However, this will only slightly change the external appearance. A striking feature will be the deployment of an additional panel in the space of the control bridge … However, this will then be equipped with an additional energy converter … Mppt for short.
The relatively poor distribution of the panels on the outer shell now forces the engineers to consider the question of distribution.
2 x 2 or 1 x 4 … The additional placement of another Mppt is still pending…
Evaluations will of course follow …
Actually it is a fair size compartment I only limited the size of the solar stuffs I want to have there because I need more space for my other important stuffs like…lemme see…(lookin’ right now)…some boxes with aquarium stuffs, (wo)man toolkit to repair sutffs, smaller boxes with whatever stuff (…that I was looking for weeks ago and didn’t find🤔 until now😄)
Mostly in DK. Rarely a bit lower on the map in the EU.
Wanna move to Portugal on one day …where I can harvest 10kw on one day with one single 50W solar panel.
I would still opt for the 1 x 4 variant simply because the PV voltage is highest here and the modules do not interfere with each other in terms of charging current due to the series connection. In the 2 x 2 arrangement, I would always be concerned that the operating points of the very different panels would interfere too much when using an Mppt.
This cannot happen in the 1x4 arrangement.
And since P still = U x I, it wouldn’t matter in an ideal situation. But this ideal view does not exist due to the unfavorable roof shape of the “ESRV-CC”.
This speaks in favor of using a 150/35 …
Hehe…that is smart. Especially that additional panel on the back of the RV. It looks like it’s able to flip it down during driving. Do you have more pics? This is cute lol.
@pwfarnell A few words off-topic: I asked the staff to delete the LiTime battery topic. They did. I think I changed some emails about the parameters of their batteries with the cleaning staff at LiTime.
95.6V / 10.74A
…where I can harvest 10kw on one day with one single 50W solar panel.
… haha
…now you know more of my solar plans than you wanted to. 