Solar Vd
Submitted: Saturday, Mar 21, 2020 at 19:38
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Member - lyndon NT
Howdy
As per my previous post, I am looking at setting up solar for camping. We run a very power hungry
camp. Being in the Top End, fridges and fan have long run times.
I have ordered a 200w flexible panel from Sunyee. This panel can't be put in series or parallel according to the supplier.
Plan is to run several panels, or at least carry several panels. How many I set up at any one time will depend on duration of stay in 1 place and load.
Obviously there are some efficiency gains running 24v, not to mention the cable sizing.
That said, should I stick with 12v, Vd may be an issue.
Now if I was running from a battery to a load and had a .5 Vd @ 12V this would be a major issue. But what about on the supply side of the MPPT. Just how real would the effect be?
Also, what formula are people using here to calculate Vd. I have a copy of a cable sizing sheet from Ashdown Ingram's, This gives a recommended length/size chart but no actual properties of each cable that I can punch into a formula. I will be using 1 size cable from panels to large Anderson plug on car, then bigger cable from there to MPPT. Though I will have to crimp it down in size before termination into the MPPT as the maximum cable size will be 6 B&S and I will probably be running 2 B&S. With 6 B&S being used out in the "field".
Looking at the 50A version
Panel sizing around 600w and maybe a little more.
Battery capacity with boat included 700 a/h
I was also thinking of going from MPPT to chassis and from Anderson plug to chassis for the negative and just running the active.....
Thoughts folks?
(let me guess, run them in series :-) or possibly series/parallel
Cheers
Lyndon