Nvreloader wrote: »
Turned on the wp, it cycled about 5 sec? untill the pressure was reached in H20 lines, shut off wp,
then turned on the facuet and ran it untill NO water came out, then shut it off,
TURNED on the WP and the clamp on meter read 3.0amps for the approx 5 sec it took to repressure the water line.
I figured that the total time used for the day/night (24 hr period) would be approx 1 hr total time, which would = 3 ahr used?
Reefer was running and showed 2 amps per meter,
I figured that 12 hrs of run time for a 24hr period, which would = 24a hrs used?
Was running and showed .05 amps, which would equal 24hrs x .05 = 1.2 ahrs used?
Was running and showed .11 amps x 24hrs would = 2.64 ahrs used?
Radio, disreguard, fused pull, don't use at all.
2-50 lite led panels per light fixture, showed .33amps x 8 lights used per night, approx 4 hrs (assorted places) would equal = 1.65 ahrs used?
Started furnace, meter showed 10.5 amps at start up, then leveled off to 9.1 amp for the 5 minutes it ran and shut off by itself, furnace runs/comes on in about 1 hr cycles, which would equal about 72 ahrs used for night time use of 8 hrs??
Water Pump = 3 amps (during it's run cycle), used 1 hr max/per day? = 3Ahr used
Reefer = 2 amps running on LPG, (don't know the cycle times yet),---= 24Ahr used
LPG Detector = .05 amps (constant on/24 per day),
= 1.5Ahr used
CO Detector = .11amps (constant on/24 hrs per day),
= 2.65Ahr used
LED lite panels (2/panels per lite fixture) = .33 amps
= 10.5Ahr p/nite use
Furnace= 9.1amps for 5 minute cycle, comes on once per/hr x 8 hrs (nite time use= 72Ahr)
Total = 104 Ahrs used per 24hrs
This is what I have come up with from my panels:
IMP rating from Panel = 7.52a
7.52a x 4 panels = 30.08a total produced x 5 hrs p/day of sun = 150a total p/day produced
75% = 115a actual amps total put back
The above figures DO NOT include any bonus I will get from MPPT CC and the tilt angles etc,
usually there is CLEAR/SUNNY and COLD weather during this time period,
temps normally run 20* to -20*, with several inches of snow on the ground etc
We normally stay about 2-3 wks per site, Oct thru last day of Feb,
I would tilt the panels to get all the sun power I can get.
Where am I making mistakes?
Nvreloader wrote: »
What would be a better way of checking the amp draw, let the WP run/pumping water and then check the draw?
I could shut off the reefer for several minutes, then start it up and check the draw.
As far as how many times it cycles (on/off) per 24hr period is a SWAG, I can hear the LPG come on,
if I am standing outside next to the exhaust, but cannot hear it inside.
I will be looking into getting the replaceable type battery's detectors,
"If the furnace runs 5 minutes every hour":
9.1 amps * 5 min/60 min per hour * 8 hours = 6.1 AH per night"
This is the correct info (above), the last few nights has been hovering around 20* during the night time,
I am not sure how to figure out the amp hr draw during COLDER temps,
I would SWAG about 10 minutes for the Real cold temps,
so the amp hr useage would be approx 13.5 AH p/night.
Hot water heater, (almost forgot),
have to find the wiring to get the readings??
As for the sun hrs on the panels, I did an average of these hrs according to the locals where we normally stay, was hard to get correct info as I had to use other areas/states info, as NO info was provided, except the couple of areas that were 50+ miles away from our spots.
Again a SWAG, so I'll use the 4.0hrs of sun hrs for the panels, to be on the safe side and anything over is a +.
Why is the derating .66% and yet when figuring out the amp hr used the rating is 73%???
Kinda confusing to me.
I am planning/building for a total of 3% loss or better in my system, if possible.
For the moment, ~61% overall efficiency for your DC system (from solar panel Rating to useful DC power), is close enough. Once you have the basic system designed--You can always go back and revisit the assumptions. But 3% "error" is in the noise.
So, at this time I am using 47ah per/24 hrs (SWAG) untill better info can be obtained
Info from my 220W panels:
IMP rating from Panels = 7.52a
7.52a x 4 panels = 30.08a total produced x 4 hrs p/day of sun = 120ah total p/day produced
75% rating = 90ah total put back into the battery bank of 400ah
90ah used out of a 400ahr battery bank, would = 4.4 days use to 100% DoD,
2.2 days use for 50% DoD,
or just over 1 day of use at 25% DoD, intended target percentage.
My intended battery bank was 4-220 GC battery's,
but I have the room to extend the amount of GC battery's to 8 very easy and can go bigger, if needed.
Does everything look OK?
Nvreloader wrote: »
Rounded off figures = 70 Ahr used/24 hrs = 840 W/hrs per dayWill use 4-200A GC batterys= 800A, (can add more battery's if needed)880 W panels installed and with MS 60 MPPT CC used,
BB. wrote: »
I am not sure I completely understand your daily WH/AH loads---Bill
BB. wrote: »
I have seen a few RVs that were short of roof space install solar panels on a frame and use it as an awning. But that is a project in its own right (picking panels, how to make frame/mount and still be light and strong enough for the job).
Note: We are currently transitioning from using welding cable to using MTW UL listed cable for all of our battery/inverter wiring. Many solar companies sell welding cable for use with batteries and inverters. There's no safety issue when using welding cable, but it can cause problems with some electrical inspectors. Technically, welding cable is only meant to be used on welding machines. When welding cable is used on anything but welders, it violates the national electric code (NEC). This is why we've started using MTW listed cables. MTW stands for "Machine Tool Wire" and it's essentially the same thing as welding cable, but with a more versatile electrical listing. This means it's approved for many more uses than standard welding cable. If you would like to learn more about cable and wire listing and use, please read this article entitled "Clarifying Confusing Cables" from Home Power Magazine. All other cables are welding cable, unless otherwise specified.