Water Pump Pull
In any case, I can see an early step is to determine the electrical energy needs of life in my old Boler. The biggest draw in the unit is the water pump  the only other use of electricity is lighting: and those are all LED lights. My furnace is convection only  a great energy savings from my last unit that had a furnace fan.
I have a small SHURflo water pump (a 911352, if that makes a difference) and cannot determine either from the original documentation or online how much current it pulls.
Can anyone give me a ballpark estimate of how much I should allocate to a water pump?
I suspect it will not be long before I am familiar with such terms as amp/hours and the esoterica of battery technologies. Thanks for your help.
Comments

It depends on pressure, but my guess is less than 5 amps. Better would be to measure it.
I am available for custom hardware/firmware development

I did a quick search, and 911352 is the part number for the installation manual, not the pump.
Here's a link to the document I found that makes that reference. If your pump is the one described here, it's a 12VDC pump that draws something less than 5A. Award for @jonr for guessing right!Offgrid cabin: 6 x Canadian Solar CSK280M PV panels, Schneider XWMPPT60150 Charge Controller, Schneider CSW4024 Inverter/Charger, Schneider SCP, 8S (25.6V), 230Ah Eve LiFePO4 battery in a custom insulated and heated case. 
Thanks, guys  that's great info. For the purposes of estimating power consumption, I'll just use the highest number (4.8 amps).
I hate to show such weak understanding of this stuff, but when I have a 75 watt panel how many amps can I expect to generate in a day with, say 5 hours of sunshine? I have calculated that 75 watts = 6.25 amps at 12 volts, but does this remain a per/hour rate since watts are a measure of a rate?
BTW: Horsefly, is that by any chance the name of your town? If so, I have visited a few times and quite enjoyed it. 
BC_Warren said:BTW: Horsefly, is that by any chance the name of your town? If so, I have visited a few times and quite enjoyed it.Offgrid cabin: 6 x Canadian Solar CSK280M PV panels, Schneider XWMPPT60150 Charge Controller, Schneider CSW4024 Inverter/Charger, Schneider SCP, 8S (25.6V), 230Ah Eve LiFePO4 battery in a custom insulated and heated case.

Close to where I live right now ~ 30 miles E.... different from where my Off grid system is...
KID #51B 4s 140W to 24V 900Ah C&D AGM
CL#29032 FW 2126/ 2073/ 2133 175A EPanel WBjr, 3 x 4s 140W to 24V 900Ah C&D AGM
Cotek ST1500W 24V Inverter,OmniCharge 3024,
2 x Cisco WRT54GL i/c DDWRT Rtr & Bridge,
Eu3/2/1000i Gens, 1680W & EPanel/WBjr to come, CL #647 asleep
West Chilcotin, BC, Canada 
BC_Warren said:I hate to show such weak understanding of this stuff, but when I have a 75 watt panel how many amps can I expect to generate in a day with, say 5 hours of sunshine? I have calculated that 75 watts = 6.25 amps at 12 volts, but does this remain a per/hour rate since watts are a measure of a rate?
So, the way to do this is a little more complicated. Figure out all your loads (in Watts, which is power). You need to include everything, because even little things will impact your energy budget. Sounds like you have a start at that, but now you need to think about the "little things" like cell phone chargers.
Now factor / multiply each of those loads by how much time they are used in a 24 hour day. That is, if a light will be drawing 4W and is expected to be on for 4 hours per day, that is 16 watt hours (energy). Add all those up, and you have the energy consumption per day.
Now you have two numbers: The total watts (power) you may be using at any one time (assuming all the things are on at the same time as appropriate), and the total watt hours (WH, or energy) you will be using in a day.
Once you know the WH per day you'll need, you can calculate how much storage (battery) you need for energy. That has to take into account things like how you want to deal with nosun / limitedsun days (more storage), and how much of your loads are 12VDC (like your pump) and how much are 120VAC. The 120VAC requires an inverter, and to size that you need to be using the maximum watts you need at one time.
The size of your battery and how much solar energy is available at your location will then lead you to how many of how big solar panels you should shoot for. There's lots of relatively simple math, but if you do the math you are much more likely to have a system that won't disappoint you and that maybe you can be happy with.
Now I'll wait for the better answer from Bill. ;)
SteveOffgrid cabin: 6 x Canadian Solar CSK280M PV panels, Schneider XWMPPT60150 Charge Controller, Schneider CSW4024 Inverter/Charger, Schneider SCP, 8S (25.6V), 230Ah Eve LiFePO4 battery in a custom insulated and heated case. 
I have two SHURflo 2088 pumps in my bus, and they each draw up to 7 amps at 45 PSI, but less at lower pressures. SHURflo also makes simple lowflow pumps and bigger highcapacity pumps  which one is yours?
John
40' Crown bus with 2kW of tiltable panels on the roof:
Eight Sharp 255W, two Morningstar TSMPPT60, Magnum MS2000, Champion C46540 generator converted to propane, eight golfcart batteries, and maybe a small Exeltech inverter for the fridger.
Southern California

You can get a good idea of run time and watt hours if you know how many gallons per day you use. For example, 30 GPD might be 10 min/day and 11 watt/hrs per day (very little, probably less than a single LED light).
I am available for custom hardware/firmware development

BC_Warren said:Thanks, guys  that's great info. For the purposes of estimating power consumption, I'll just use the highest number (4.8 amps).
I hate to show such weak understanding of this stuff, but when I have a 75 watt panel how many amps can I expect to generate in a day with, say 5 hours of sunshine? I have calculated that 75 watts = 6.25 amps at 12 volts, but does this remain a per/hour rate since watts are a measure of a rate?
The number 75 is not a rate, it is an instantaneous value of energy.
Rate would be 75 watts per hour, meaning the energy source provides 75 watts for an entire hour, 75 watthours.
Now, if clouds roll in, night falls, and you only got good light for one hour in a 24 hour period, you generated 75 watthours for the day.
Next day, you get better daylight, let say 4 hours, then clouds and night, you generated 75*4= 300 watthours for the day.
I doubt you will get 6.25 amps from the panel. If you can find make/model of panel, you could then find the maximum power current specification, it will be somewhere near 4 or 5 amps.
And, that 4 or 5 amps will be at high noon only, lower on either side if high noon.
So, for ease of calculation, assume 5 amps for the hour splitting high noon (11:3012:30), then lower numbers for the other hours of daylight. (So you never really get 75*4= 300 watthours)
Now take into consideration tilt and orientation component inefficiencies, and you get lower numbers
A particular day for me looks like this (tilt 22 degrees orientation 150 degrees so my high noon is around 11:15 AM)
In the table below, I would multiply each wattage by 30 minutes, then add up to get 15,368 watthours from a system designed with 5.1KW panel size.
time watts8:00:00 AM 1240 8:30:00 AM 2014 9:00:00 AM 2620 9:30:00 AM 2952 10:00:00 AM 3144 10:30:00 AM 3221 11:00:00 AM 3399 11:30:00 AM 3303 12:00:00 PM 3075 12:30:00 PM 2956 1:00:00 PM 2813 Camden County, NJ, USA
19 SW285 panels
SE5000 inverter
grid tied 
Thanks again, guys. Your willingness to take the time to share your knowledge is very helpful. I am going to be using an existing system for the most part, but with your help, I have begun to much better understand what I have and as I move forward I hope I can make somewhat informed decisions about what I need.
I have been surprised at how much energy I can actually glean from solar. I ran my little ol' Boler for 12 days last summer after I bought it with no power other than the solar installed and was quite impressed that it worked so well. But now I want to better understand exactly what is "under the hood," and this has been extremely helpful. Thanks.
And, Horsefly  the town that is named after you is in the Caribou region of central British Columbia, pretty much east of the larger city of Williams Lake (where I now suspect Westbank lives). 
BC_Warren said:And, Horsefly  the town that is named after you is in the Caribou region of central British Columbia, pretty much east of the larger city of Williams Lake (where I now suspect Westbank lives).Offgrid cabin: 6 x Canadian Solar CSK280M PV panels, Schneider XWMPPT60150 Charge Controller, Schneider CSW4024 Inverter/Charger, Schneider SCP, 8S (25.6V), 230Ah Eve LiFePO4 battery in a custom insulated and heated case.

If it helps any, I used a 12 volt Jabsco pump to power my island cabin. It ran from a single 12 volt deep cycle battery for about a month before needing recharging. This was with NO solar panel whatsoever! So you might get away with your 75 watt panel depending on what else you expect the system to run.Island cottage solar system with 2500 watts of panels, 1kw facing southeast 1.3kw facing southwest 170watt ancient Arco's facing south. All panels in parallel for a 24 volt system. Trace DR1524 MSW inverter, Outback Flexmax 80 MPPT charge controller 8 Trojan L16's. Insignia 11.5 cubic foot electric fridge. My 30th year.

I used a 1.2gpm surflow pump on my diesels water injection for a while . At low pressure it would only draw 2 amps. At full cut off pressure, 90psi it would draw nearly 5.
Solar hybrid gasoline generator, 7kw gas, 180 watts of solar, Morningstar 15 amp MPPT, group 31 AGM, 900 watt kisae inverter.
Solar roof top GMC suburban, a normal 3/4 ton suburban with 180 watts of panels on the roof and 10 amp genasun MPPT, 2000w samlex pure sine wave inverter, 12v gast and ARB air compressors.
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