Radio Unit - Meraki MR-58 Power Consumption: 7.5Watts typical (12.8 max)
180 Watts per Day
307.2 Watts per Day
To sustain four days of rain, we need to plan for five days of power.
Five Days of power requires:
180 * 5 = 900 Watts
900 / 12 = 75 Amp Hours
307.2 * 5 = 1536 Watts
1536 / 12 = 128 Amp Hours
We presently utilize two revolving battery pairs. EverStart 12V 125 Amp Hours, so we have 250 fresh amp hours
available each time we visit the array and swap. (We grid-tie charge the spair pair in the office.)
This exceeds even the HIGH END consumption curve by 122 amp hours for a five day period, but we're being forced to rotate batteries on average every 6.5 days.
Assuming 4 Hours of insolation daily, we need to achieve X watts of charge per hour.
180 / 4Hrs = 45 watt panel requirement
307.2 / 4Hrs = 76.8 watt panel requirement
We have a pair of Kyocera 80-watt solar panels in parallel which should produce a maximum total output of 160 watts. This is again nearly double our HIGH END requirement for a five day period.
Our Morningstar PS-15 solar controller appears to be functioning - it indicates the battery array is fresh when I swap in new batteries, and with sunlight present indicates a charge is being applied to the batteries.
We do not connect our load to the batteries, but the LOAD output of the controller. Formerly, we converted to 110VAC to plug in the 802.3af POE injector which Meraki provides for their MR58 units. We were wasting a great deal in the conversion, and presently utilize a 12VDC to 48VDC POE injector to power the radio unit, so our conversion is quite lean.
It's nearly 6:30 PM on the left coast, and I've no daylight left to visit and troubleshoot the array today. I believe I'll be spending my Friday morning after breakfast and coffee with my volt meter taking measurements from each of the pannels directly, then together in parallel. I have a Blue Sky Energy Solar Boost 2000E unit with MPPT technology on hand that can isolate the Morningstar solar controller as a potential issue. I visited the Blue Sky offices and had a full bench test performed on the unit and verified it's ready to rock.
I'll be getting to the bottom of this, one way or another, before Monday.