Quote:
Originally Posted by Lpaine1331
Hi larry! that does help a lot.
the 65amps is per battery (I'm assuming full charge) . i have two batteries in parallel.
would i need to upgrade the batteries if I go to a larger inverter? Or would i be ok with what i have now.
Im toying with upgrading my batteries to more amp-hours...and increasing the size of the inverter. I just didnt know if i could increase the size of the inverter without upgrading the batteries.
and yes..i would only be hairdrying to five-ten minutes or so.
Also, i have a 100w solar panel now which with my current setup charges to full in a day or so. (rarely use stuff during the day..mostly at night). would a 200w solar panel charge faster?
|
Hi Lesley,
You currently have 130 amp-hours capacity, but you only have 65 amp-hours USABLE. Flooded Lead Acid batteries start to be damaged if they are drawn down below 50% state of charge.
There are two different questions you are pondering:
- Do I have to upgrade my inverter? Yes. The present inverter can only provide 1000 watts. It's circuit breaker will trip if you use an 1100 watt or 1875 watt appliance. (How many watts does your present hair dryer consume?)
- Will my current battery set work with a 2000 watt inverter? Yes, but each usage will take a good chunk of the available charge.
Now that we've concluded that you have 65 amp-hours available, remember these 5-minute statements:
92 amps x 5/60 = 7.7 amp-hours (small dryer for 5 minutes)
156 amps x 5/60 = 13 amp-hours (large dyer for 5 minutes)
If you don't use anything else, you can use the small dryer for 8.5 times or the large dryer for 5 times AND NOTHING ELSE. That's okay if you boondock for 2- or 3-day weekends and don't use a coffeepot, toaster, or microwave oven.
Quote:
Originally Posted by Lpaine1331
and yes..i would only be hairdrying to five-ten minutes or so.
|
Umm...ten minute drying halves the number of uses to 4-1/4 or 2-1/2 uses.
[QUOTE=Lpaine1331;2805521Im toying with upgrading my batteries to more amp-hours...and increasing the size of the inverter. I just didn't know if i could increase the size of the inverter without upgrading the batteries.[/QUOTE]
If you have the moolah, your needs would be well-met by replacing the Flooded Lead Acid batteries with Lithium (LiFePO) batteries. They have much greater capacity (amp-hours) and can be drawn down much lower without damage.
I don't know much about lithium batteries (or hair dryers either) so I'm using
https://www.amazon.com/LiFePO4-Lithi...2-8997e41410bb (like the hair dryers). Others can tell you whether it's a good choice. It's a 100 Amp-hour battery with 100% discharge limit. That means that two of these raises your capacity
from 65 AH to 200 AH! They cost $329 each (!) and if your current converter (battery charger in the RV) isn't lithium-capable, you may want to change that, too. With these you could go several days without worrying.
Quote:
Originally Posted by Lpaine1331
Also, i have a 100w solar panel now which with my current setup charges to full in a day or so. (rarely use stuff during the day..mostly at night). would a 200w solar panel charge faster?
|
Hmm... Yes, of course 200 watts of solar will charge the batteries faster and more completely than 100 watts.
You only get 100 watts from the panel for an hour or two around noon, and then only on clear skies, sun high overhead (summer), and in an unshadowed (tree-free) campsite. Maybe the dawn to dusk average is closer to 40-50 or lower.
Flooded Lead Acid batteries don't charge at a linear rate. The closer they get to full-charge, the slower they accept additional charge. (Lithium batteries don't have this annoying characteristic--they accept a fast charge rate throughout the charging cycle.)
I don't have the numbers to work with, but I'm pretty sure that neither 100 nor 200 watts of solar can keep up with the hair dryer. With lithium batteries you might be able to charge at home and camp for several days.
Or you could simply get a generator and use it when you are using the hair dryer.