That's awesome. Real world experience! Tell us more! Do you have any more details on your setup? What are you powering? What is your power draw in Ah/day? How long can your vehicle sit without being started while powering all those devices? Are you able to keep up with power demand? What is the battery size that you are charging? Do you have a build thread? I'm super excited to see your setup!
THANKS FOR THE INFO AHEAD OF TIME!
I just did a quick google search to make certain I'm not off base, and a quality USA made monocrystalline 150w panel that would easily fit on a roof rack (stock or aftermarket) is ~$155. Even when searching "expensive" sites they were under $250 ... for 150w. That's almost double the output at almost 1/3 the cost (2.7333). $419 vs $150 (panel to panel price) is a massive difference in price.
BUT a roof mounted panel doesn't look as awesome, doesn't provide anti glare, isn't as easy to install, and while I'm not going to store anything on my hood, storing something on my roof is a reality so I'm giving up that real-estate. All of those things have a “cost” …
I'm still struggling with this, but if I KNEW for certain that the Cascadia panel could stave off a dead battery (dead battery = 50% capacity of an AGM ~12.25 - 12.05v) while running a fridge, HAM TX/RX/APRS, charging phones and tablets for ~3 days I really couldn't ask for much more and anything larger than 85w is just solar I don't need. Ideally if I couldn't reach the fully charged goal (unlikely the panel could 100% keep up with that demand), and I'm just out pacing solar production and end up down to ~70-75% battery capacity (~12.37-12.55v), after 3 days that's realistically all I need. I'm rarely ever somewhere longer than 3 days without starting my vehicle. Once I start the vehicle up the alternator and DC/DC charger will take over and produce whatever solar can't.
SO, let’s do some MATH
My expected power needs:
Cell Phone battery 4,614 mAh x4 (18.456 Ah/Day)
Tablet battery 8,000 mAh x2 (16Ah/Day)
Nintendo Switch battery 4310 mAh x1 (4.31 Ah/Day)
Phones/Tablet/Game use = 38.766 Ah/Day
ARB Fridge Spec (from ARB):
.7 to 2.3 Amps Per Hour
Fridge uses 16.8 to 55.2 Ah/Day
Yaesu FTM-400XDR
2 Meters
Receive Only (Unsquelched, Fan running) 0.30A
5W 2.2A
20W 4.1A
50W 7.2A
70 cm
Receive Only (Unsquelched, Fan Running) 0.30A
5W 2.6A
20W 4.8A
45W 8.0A
Assumptions:
7hrs of daylight, 12.0v system for simplicity, solar panels are 85w
It takes 9.285hrs to fully charge a Group 35 battery from 50% charge (~12.25 - 12.05v) with this panel according to the math here:
Family Overland 200 build for a family of 4 + 1 - https://forum.ih8mud.com/threads/family-overland-200-build-for-a-family-of-4-1.1253297/post-14253937
How much power can the Cascadia 4x4 Land Cruiser solar panel create?
Average hours of sunlight × solar panel watts x 75% = daily watt-hours.
7hrs x 85w x 75% = 446.25 Wh/day
Watt-hours = Amp-hours * Volts
Amp-hours = Watt-hours / Volts
446.25 Wh/day / 12v = 37.1875 Ah/Day
The Cascadia 85w Land Cruiser panel can produce a maximum of 37.2Ah per day. (I doubt it's putting out this much power based on the specs on their website).
Outcome:
So, just 4 full charges of a single cell phone or a single charge of 4 phones (I have 3 phones and 1 hotspot), 2 full charges of a tablet (I have 2 tablets), and 1 full charge of a Nintendo Switch gaming system (all together) uses more power than the Cascadia solar panel can produce by 1.5785 Ah/Day.
Add in an ARB fridge and you are now in a deficit of 18.4 to 56.8 Ah/Day. That’s not an insignificant deficit!
My Die Hard Platinum Group 35 AGM battery has ~55Ah of capacity and about 27.5Ah of usable capacity if I run it to 50%.
Keep in mind, we calculated these numbers using 7hrs of daylight which a full hour more of sunlight than the #1 ranked state in the USA’s average sunlight. I’m not including additional draws on my electrical such as my HAM radio, smart charger efficiency loss,
etc etc etc ..
Can someone PLEASE check my math? I REALLY want to like this panel solution!