Scalable aux. electrical solar circuit

[mitchkman]

Hi,

I'd like to add dual battery and solar setup to my truck (2011 Nissan Frontier Pro-4X). I'm going slightly over budget with my build already so I need something small to start with, yet easily extendable for bigger needs.

Here are my energy requirements:
- Laptop: 240wH/day (4H usage * 60w)
- 2 cell phones: 18wH/day (2 * 9 w per charge, one charge per day)
- Diesel heater (8kw output) : 350wH/day 240wH/day (10H usage * 3.5w 24w on high temperature)

Total requirements: 608 wH per day / 51 aH per day 498 wH per day / 43.6 aH

As input I plan:
- 100w 200w solar panels, 660wH/day 500wH/day (60% 50% avg. output * 11 5 sun hours * 100w 200w)
- 130 amp alternator to jump in when needed

As for equipment, I plan on using:
- 12v DC/DC charger, acts as isolator as well: https://www.renogy.com/dcc30s-12v-30a-dual-input-dc-dc-on-board-battery-charger-with-mppt/
- 300w inverter https://www.amazon.com/BESTEK-300W-...1&keywords=car+inverter&qid=1605834283&sr=8-5
- Solar panels: https://www.amazon.com/Renogy-Monoc...ywords=100w+solar+panel&qid=1605834499&sr=8-1
- 100aH battery: https://www.amazon.com/Rechargeable-Battery-Trolling-Wheelchair-Universal/dp/B07ZN12CKD/ref=sr_1_1_sspa?crid=3DDEJCXJJIZWR&dchild=1&keywords=100ah+battery+12v+deep+cycle&qid=1605834526&sprefix=100+aH+,aps,215&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFWSjRaVjc5V0VLU0MmZW5jcnlwdGVkSWQ9QTAyNjE4MTQxRjNUQkpNVjJRUVFCJmVuY3J5cHRlZEFkSWQ9QTAwMDA5MzkxT0M5WkFQUVBYOEpEJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
- Diesel heater: https://www.amazon.com/Fiberfly-Muf...jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

Questions:
1. Do the calculations make sense?
2. Can I easily add another solar panel in parallel and it'll just work?
3. Can I easily add another battery in parallel (assuming the same exact battery) and it'll just work?

Thank you!!

 

[plh]

Probably won't get 11 hours of good sun in the winter when you will need the heater. Maybe 4 or 5 @ 50%. As an example, right now, 10am central and 43 degrees north latitude, clear day, I'm pulling a whopping 1.25 amps (about 21 watts) on a 50W Renogy panel that I'm doing some testing on. Panel is rated for 2.84 amps optimum.
Yes you can just parallel up the panels.

 

[mitchkman]

Thank you all!

Your calculation for heater seems faulty ”Diesel heater: 350wH/day (10H usage * 3.5w on high temperature)”

Yeah, 3.5 was the amps on max temperature, not wattage. Also, I changed my calculation that I don't need to run the heater on max temperature all night - let's just say it draws 2 amps.

Probably won't get 11 hours of good sun in the winter when you will need the heater. Maybe 4 or 5 @ 50%.

With the Winter output, I guess I'd need a 200W solar panel to be even without starting the truck to charge.

Let me know if my changes above looks better.